Anular Gk13-5 (0101a)Compact

Operator's ManualCompact GK 13 5/8"-5000 psi Annular BOP

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Manual 0101A OPERATOR'S M

ANUAL

Compact GK13 5/8"- 5000 psiAnnular Blowout Preventer

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Pressure Control Equipment

Please contact Hydril Pressure Control Equipment for any assistance or questions concerning the information in thismanual. All information contained in this manual is the exclusive property of Hydril Company LP.

CONTENTS

PAGE

OPERATOR QUICK REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3SECTION 1.0 INSTALLATION AND OPERATION1.1 Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.2 Surface Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

SECTION 2.0 PHYSICAL DATA2.1 Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.2 Bolt and Wrench Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.3 Lubricant List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.4 API Ring Joint Flange Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.5 Clamp Hub Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.6 Inside Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142.7 Outside Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

SECTION 3.0 PACKERS AND SEALS3.1 Packing Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.2 Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

SECTION 4.0 MAINTENANCE AND TESTING4.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194.2 Seal Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.3 Packing Unit Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

SECTION 5.0 DISASSEMBLY AND ASSEMBLY5.1 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.2 Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

SECTION 6.0 PARTS AND STORAGE6.1 Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246.2 Preventor Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266.3 Rubber Goods Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

HYDRIL BOP SALES AND SERVICE LOCATIONS

HYDRIL COMPANY LP/P.O. BOX 60458/HOUSTON, TEXAS 77205TELEPHONE: (281) 449-2000FAX: (281) 985-2828 / WEB: www.hydril.com

2001 Hydril Company LP Printed In The USA April 2001 Rev. A, January 2002


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OPERATOR QUICK REFERENCE

OpeningPressure

sssssSurface Control Pressure psi

WELL PRESSUREpsiInitial*

Pipe Size Closure 500 1500 2500 3500 5000

2 3/8 950 850 600 350 100 50

2 7/8" 750 650 400 150 50 50

3 1/2" 700 550 300 50 50 50

4 1/2"-5 1/2" 650 500 150 50 50 50

7"-9 5/8" 600 400 50 50 50 50

CSO 1150 1150 1150 1150 1150 1150Close cautiously to prevent collapse of casing.

s *Use closing pressure shown at initial closure to establish seal off and reduce closing pressure proportionally aswell pressure is increased. Well pressure will maintain closure after exceeding the required level. See Section 1 forcontrol pressure graphs. Closing pressures are average and will vary slightly with each packing unit.

Optimum stripping is obtained by adjusting the Control Pressure to achieve a slight drilling fluid leakage as the tooljoint passes through the packing unit.

ClosingPressure

Control Pressures

StandardHookup


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Proper Procedure for pressure testing any annular blow-out preventer (BOP) ensures subsequent seal off andmaximum packing unit life. Reliable seal off tests are madeby initially closing the packing unit with prescribed closingchamber pressure on the recommended size test pipe,proportionally reducing closing pressure as well pressure isincreased, and by determining the remaining piston travelafter seal off is achieved. Optimum packing unit life isobtained by testing at low rubber stress levels. Minimumpacking unit stress is achieved by use of the minimumclosing chamber pressure that will initiate and maintainseal off on the recommended size test pipe.

The HYDRIL Compact GK blowout preventer is de-signed to be well pressure assisted in maintaining packingunit seal off once initial seal off has been effected. Initialseal off is effected by applying pressure to the closingchamber. As well pressure or test pressure increases, theclosing force on the packing unit also increases. As wellpressure exceeds the required level, the packing unit ismaintained in the closed position on the recommended sizetest pipe by well pressure alone. Once initial seal off is

achieved, it is recommended that closing pressure bereduced proportionally as well pressure is increased inorder to maintain the optimum closing force on the packingunit. Optimum closing forces for high well pressures mayrequire careful application of pressure to the openingchamber. Closing pressure required to effect initial seal offmay vary slightly between individual packing units. Beginthe test with the recommended initial closing pressure.

Piston Stroke can be measured on the Compact GKblowout preventers through a vertical passage in the top ofthe BOP head. The maximum and minimum distances fromthe top of the head to the top of the piston are stamped onthe BOP head and are also listed in the table below. Pistonstroke remaining at seal off is a direct indicator of remainingpacking unit life. Record the piston stroke and the closingpressure at seal off for each test. Compare with previousresults and with maximum piston stroke for the BOP toensure subsequent seal offs. A valid test on any annularBOP is only achieved when the remaining piston stroke ismeasured at test seal off.

3

2

1

TAPEMEASURE

5/16" ROD

Sales Headquarters / P.O. Box 60458 / Houston, Texas 77205 / Telephone: (281) 449-2000Eastern Hemisphere / Hydril U.K. Ltd. Minto Avenue Altens Industrial Estate Aberdeen, AB1 4JZScotland / Telephone: +441-224-878-824 / Fax: +441-224-898-524

ANNULAR BOP TESTING AND OPERATION

OPERATIONAL DATA

Bore 13 5/8 in. 346.1 mm

Closing Chamber 17.98 68.1Volume gal. (U.S.) litersOpening Chamber 14.16 53.6Volume gal. (U.S.) litersRecommended TestPipe Size 5 in. 114 mm

Full Piston Stroke 8 1/2 in. 216 mm

Distance From Top of Head To Top of Piston

Screwed HeadMaximum Piston Full

Down 13 1/2 in. 343 mm

Minimum Piston at FullStroke 5 in. 127 mm

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CLOSINGCHAMBER

Figure 1-1. Cross-section ofCompact GK With Packing UnitFully Open.

OPENINGCHAMBER

PISTON

PACKING UNIT

WEAR PLATE

HEAD

BODY

1.0 INSTALLATION AND OPERATION

1.1 Principle of Operation

SLOTTEDBODYSLEEVE

HOISTRING


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The HYDRIL Compact GK 13 5/8"-5000 blowoutpreventer is an annular blowout preventer which will closeand seal off on drillpipe, tool joints, tubing, casing, orwireline in the wellbore or completely seal off the open holeto full rated working pressure by cornpression of a rein-forced elastomer packing element (refer to API Recom-mended Practice 53*). Seal off is effected by raising thepiston which causes the packing unit to be squeezedinward to a sealing engagement with anything in the boreor with itself on the open hole. See Figures 1-3 through 1-6.

The piston is raised by applying hydraulic pressure tothe closing chamber. The optimum closing pressure is theminimum pressure that will maintain a complete sealunder existing operational conditions. Drill pipe can berotated and tool joints stripped through a closed packingunit while maintaining a full seal on the pipe.

Any normal closing unit having a separate regulatorvalve for the annular blowout preventers and sufficientaccumulator volume can be used to operate the CompactGK annular blowout preventer. The hydraulic operatingfluid may be clean, light petroleum hydraulic oil with anilinepoint higher than 160oF, or water with soluble oil added. Incold climates, antifreeze should be added to preventfreezing. CAUTION: Do not use synthetic fluids or fueloils as serious seal damage will result.

The closing time of the preventer is determined by therate at which the hydraulic fluid can be delivered to theclosing chamber. Minimum closing time can be achievedby using short, large-diameter control lines and a largeaccumulator volume.

Figure 1-2. Upward force exertedby the piston squeezes packing rubberinward into a sealing engagement.

PackingUnit

Piston

*API Recommended Practices for Blowout PreventionEquipment Systems R.P. 53 is available from the Ameri-can Petroleum Institute, 1220 L Street, Northwest, Wash-ington, DC 20005.


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Figure 1-6. Cutaway view of Compact GK BOP withpacking unit closed on open hole. Complete closure ofpacking unit safely holds well pressure, without leakage,equal to the rated working pressure of the preventer.

Figure 1-5. Cutaway view of Compact GK BOP withpacking unit closed on square kelly. The packing unit sealsoff on square or hexagonal kellys to rated pressure.

Figure 1-3. Cutaway view of HYDRIL Compact GKBOP with packing unit fully open. The Compact GK opensto full bore to allow passage of large-diameter tools throughopen bore as well as maximum annulus flow of drillingfluids. Packing unit always returns to full open position dueto normal resiliency of rubber packing unit. Retention ofopening chamber pressure will ensure positive control ofpiston and reduce wear caused by vibration.

Figure 1-4. Cutaway view of Compact GK BOP withpacking unit closed on drillpipe. The packing unit seals offon tool joints, any size pipe, casing or wireline to ratedpressure.


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1.2.1 Surface HookupThe surface hookup for the HYDRIL Compact GK (referto Figure 1-7) connects the hydraulic control lines to theopening and closing chambers of the BOP.

Pressure applied to the closing chamber raises thepiston and causes the seal off between the packing unitand drillpipe. Well pressure or test pressure also acts onthe piston below the sealed off packing unit and furtherincreases the closing force acting on the packing unit. Asthe well pressure or test pressure exceeds the requiredlevel, the preventer is kept closed by well pressure alone.As well pressure further increases, the closing force on thepacking unit also increases. Closing pressure should bereduced proportionally as well pressure is increased inorder to maintain optimum closing force on the packingunit and prolong the life of the packing unit.

The control pressure graph (Figure 1-8/1-8a) showsthe relationship of closing pressure and well pressure foroptimum seal off.

During normal drilling operations, it is recommendedthat the pressure regulator valve for the GK be set at theinitial closing pressure shown for the size pipe being used.This pressure will ensure that initial seal off is achievedshould a "kick" be encountered.

During BOP testing operations, once initial seal off isachieved, closing pressure should be reduced proportion-

OpeningPressure

ClosingPressure

Figure 1-7. Standard Hookup

1.2 Surface Operation

Figure 1-8. Operating Curves Compact GK 13 5/8"-5000 PSI Annular BOP

ally as well pressure is increased.The control Pressure graph, Figure 1-8a, shows therelationship of closing pressure and well pressurerequired to effect optimum seal off for the GK 13 5/8"-5000 BOP when supplied with the long life packing unit.

WELL PRESSURE-PSI

1000

0 1000 2000 3000

500

1500

0

s

s

s

s

s C

LOSI

NG P

RESS

URE-

PSI

4000 5000

**7" thru 9 5/8" PIPE

4 1/2" thru 5 1/2" PIPE

3 1/2" PIPE2 7/8" PIPE

2 3/8" PIPE

CSO

*Closing pressures are average and will vary slightly with eachpacking unit. Use closing pressure shown at initial closure to establish sealoff and reduce closing pressure proportionally as well pressure is increased.Well pressure will maintain closure after exceeding the required level.**Close cautiously to prevent collapse of casing.


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WELL PRESSURE-PSI

1000

0 1000 2000 3000

500

1500

0

s

s

s

s

s C

LOSI

NG P

RESS

URE-

PSI

4000 5000

CSO

2000

2200

Figure 1-8a: Average Control Pressure Compact GK 13 5/8"-5000 PSI BOP, Long Life Packing Unit

* Closing pressures are average and will vary slightly with eachpacking unit. Use closing pressure shown at initial closure to establish sealoff and reduce closing pressure proportionally as well pressure is increased.Well pressure will maintain closure after exceeding the required level.**Close cautiously to prevent collapse of casing.

2 7/8" thru 3 1/2" PIPE2 3/8" PIPE

** 7" PIPE

5" PIPE


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Although not recommended as a routine practice, if neces-sary drillpipe can be rotated and tool joints stripped througha closed GK packing unit while maintaining a full seal.Longest life for the packing unit is obtained by adjusting theclosing chamber pressure low enough to maintain a sealon the drillpipe with a slight amount of drilling fluid leakageas the tool joint passes through the packing unit. Thedrilling fluid leakage indicates optimum seal off for mini-mum packing unit wear and provides lubrication for the drillpipe motion through the packing unit.

Slow tool joint stripping speeds reduce surge pressuresand prolong packing unit life. The pressure regulator valveshould be set to provide and maintain the proper controlpressure. If the pressure regulator valve does not respondfast enough for effective BOP control, a surge absorber(accumulator) should be installed in the closing chambercontrol line adjacent to the blowout preventer. Prechargethe accumulator to one-half of the closing pressure re-quired to effect a seal off at the existing well pressure for the

Surface Hookup

Figure 1-9. Hookup for Surface Stripping Operations

OpeningPressure

ClosingPressure

1.2.2 Surface Stripping Operations

Surface Hookup With Surge Absorber

Example Precharge Calculation:500 psi well pressure, 4 1/2" - 5 1/2" drillpipePrecharge = 0.50 X Closing PressureFrom Figure 1-8:Closing Pressure = 500 psiPrecharge = 0.50 x 500 psiPrecharge = 250 psi


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2.0 PHYSICAL DATA

a Refers to Figure 5-1.

b Torque values based on use of Never-Seize Thread Lubricant (coefficient of friction is 0.069) or equivalent.

2.1 Engineering Data

English MetricBore .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5/8 inches 346 mmWorking Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000 psi 345 BarMaximum Operating Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3000 psi 207 BarShell Test Pressure (Factory Test Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,000 psi 690 BarClosing Chamber Test Pressure (Factory Test Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000 psi 345 BarOpening Chamber Test Pressure (Factory Test Only) . . . . . . . . . . . . . . . . . . . . . . . . . . 5000 psi 345 BarVolumeClosing Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.98 gallons 68.05 litersVolumeOpening Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.16 gallons 53.59 litersPiston Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1/2 inches 216 mmHydraulic Connection, Open and Close . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0-inch NPT

BOP Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11,200 lb 5080 kgWeight Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,200 lb 1452 kg

Piston .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,300 lb 590 kgPad Eye Safe Working Load (Each) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15,000 lb 6.80 tonne

13 5/8"-5000

2.2 Bolt and Wrench Data

Ref. Description Thread Wrench TorqueNo.a Size Lb/Ft (Nm)b

5 Cap Screw - Slotted Sleeve 3/4"-10UNRC 3/4" 12-Pt Key 50 (68)

7 Cap Screw - Wear Plate 1/2"-11UNC 3/4" Hex 50 (68)

8 Lock Screw - Head 3/4"-10UNC 1 1/4" Hex 100 (135)

. . . Eyebolt - Piston 5/8"-11UNC . . . . Snug

. . . Eyebolt - Head 1"- 8UNC . . . . Snug

. . . Pipe Plug - Open & Close Ports 1"-11 1/2 NPT 3/8" Hex Key Snug

. . . Pipe Plug - Piston Indicator Port 1/2"-14 NPT 5/8" Hex Key Snug


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C

A

Bolted Flange,Using Stud Bolts.

Studded Flange,Using Studs.

C

B

2.4 API Ring Joint Flange Data

aBolt material shall be of a quality and strength not less than specified by ASTM A-193, Grade B7. Nuts shall be of aquality not less than ASTM A-194, Grade 2H. Stud bolts are threaded full length.bLengths shown herein are overall lengths, including point at both ends, as shown in table.cDimensions shown are outside diameters of 6BX flange grooves.

2.3 Lubricant ListSeals . . . . . . . . . . . . . . . . . . . . . . . Castor Oil or Silicon GreasePacking Unit . . . . . . . . . . . . . . . . . Castor OilInternal Metal Surfaces . . . . . . . . . Castor OilBOP Body & Head Threads . . . . . Zinc Base (lead-free) Tool Joint LubricantScrew & Nut Threads . . . . . . . . . . Never-Seize Thread Lubricant (coefficient of friction = 0.069) or Equivalent

SEAL RINGFLANGE

NominalSize

Inches(MM)

BoreDia.

Inches(MM)

BOLTS & STUDSa

O.D.Inches(MM)

ThicknessInches(MM)

Max. APIService

Pressure RatingPSI (BAR)

Dia. CInches(MM)

APIRing

Stud BoltsA

BoltCircleDia.

Inches (MM)

LengthbInches (MM)

SizeNo.Req.

StudsB

16 1 5/8-8UN 13 (330) 8 1/4 (210) 23 1/4 (591)

20 1 7/8-8UN 18 (457) 11 3/4 (298) 26 1/2 (673)

13 5/8 (346) 13 5/8 (346) 5000 (345) 26 1/2 (673) 4 7/16 (113) 16.063 (408) BX160

13 5/8 (346) 13 5/8 (346) 10,000 (690) 30 1/4 (760) 6 5/8 (168) 17.033 (433) BX159


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2.5 Clamp Hub Connections

J

G

BE

F

A CA

BE

F

G

H H

HUB

BX

HubSize

Inches(MM)

Seal Ring No.BoreSize AInches(MM)

RatedWorkingPressurePSI (BAR)

Hub Dimensions - Inches (MM)

13 5/8 (346) 13 5/8 (346) 5000 (345) . . . 160

13 5/8 (346) 13 5/8 (346) 10,000 (690) . . . 159

B

4 7/8 (124)

5 3/8 (137)

C

NOTE: API 16A 1st Edition Nov 1, 1986 Does Not Include Clamps.

20 5/8 (524)

22 1/4 (565)

RX D J. . .

. . .

. . .

. . .

RX OnlyStandoff

E9 1/4 (235)

10 3/8 (264)

F

26 3/4 (679)

30 3/8 (772)

G H31 (787)

35 5/8 (905)

7 11/16 (195)

9 1/2 (241)

Clamp Dimensions - Inches (MM) s

s Clamp dimensions may vary from those shown.


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5000

NOMINAL DIMENSION G H J K L M

Bore

13 5/8(346)

I.D.Piston

16.25(413)

I.D.Upper Body

37.50(953)

I.D.Lower Body

28(711)

PistonHeight

23.69(602)

Stroke

8.50(216)

PackingUnit

Height

13.50(343)

Head Topto Wear Plate

Bottom

7.75(197)

Sleeve Topto HeadBottom

13.93(354)

2.6 Inside Dimensions

NOMINAL DIMENSION A B C D E F

Head Height

15.75(400)

Head Topto Piston Top(Full Down)

13.50(343)

5000

O

21o

2.6.1 Inside Dimensional Data Inches (MM)

A

B

C

D

E

J

L

MK

F

H G

O.D.Upper Piston

30.25(768)


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2.7 Outside Dimensions

NOMINAL DIMENSIONS

2.7.1 Outside Dimensional Data Inches (MM)

A

B

C

D

E

F

H

OpenChamber

CloseChamber

G

A49.84(269)

B45.25(362)

C33.19(843)

F12

(305)

G52.75(1340)

H60.25(1530)

D16.65(423)

E22.69(576)


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Figure 3-1Cutaway drawing showinghow rubber is molded aroundsteel segments.

Figure 3-1aLong Life Packing Unit

3.1 Packing UnitsThe heart of the GK blowout preventer is the packing unit(refer to Figure 3-1 and 3-1a). The unit is manufactured byHydril from quality proprietary rubber compounds andreinforced with flanged steel segments. Each unit has alarge volume of tough, feedable rubber to meet any require-ment.

The molded-in steel segments have flanges at the topand bottom These segments anchor the packing unit withinthe blowout preventer and control rubber extrusion andflow when sealing off well pressures. Since the rubber is

confined and kept under compression, it resists tears andabrasion.

All annular blowout preventer packing units are sub-jected to wear during closure and stripping. The design ofthe HYDRIL GK compact blowout preventer is intendedto result in closure wear on the outside of the packing unitwhile stripping wear results on the inside. Thus, thestripping life of the packing unit is affected by wear fromroutine closures.

3.0 PACKING UNITS AND SEALS


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Figure 3-1. Packing Unit Construction

Feedable Rubber

Flanged Steel Segments

3.1.1 Packing Unit SelectionBecause of the importance of the packing unit to theoperation of the blowout preventer and to the safety of thecrew and rig, only genuine HYDRIL packing units shouldbe used as replacements for original equipment. AllHYDRIL packing units are tested to full rated pressureinside a test blowout preventer at the factory as part of rigidstandard acceptance tests before being furnished to theconsumer.

Packing units for HYDRIL blowout preventers aremanufactured from proprietary compounds or natural rub-ber, nitrile rubber, or neoprene rubber.

Natural Rubber is compounded for drilling with wa-ter-base drilling fluids. Natural rubber can be used atoperating temperatures between 30oF to 200oF (35oC to93oC). When properly applied, the compounded naturalrubber packing unit will usually provide the longest servicelife. This all-black packing unit is identified by a serialnumber with the suffix R or NR (refer to Figure 3-1).

Nitrile Rubber (a synthetic compound) is for use withoil-base or oil-additive drilling fluids. It provides the bestservice with oil-base muds, when operated at tempera-tures between 40oF to 180oF (4oC to 82oC). The nitrilerubber packing unit is identified by a red colored band anda serial number with the suffix S or NBR .

Seals for HYDRIL blowout preventers are manufac-tured from a special nitrile rubber material which provideslong, trouble-free service in sealing against oil, gas, orwater.

Expected H2S Service does not affect selection ofpacking unit material. H2S service will reduce the servicelife of rubber products, but the best overall service life isobtained by matching the packing unit material with therequirements of the specific drilling fluid.

Performance of elastomeric materials can vary sig-nificantly, depending on the nature and extent of exposureto hydrogen sulfide. The operator should monitor pres-sure sealing integrity frequently to assure no performancedegradation has occurred.

Storage Conditions are important for realizing themaximum life of the packing unit. Packing units should bestored in a cool, dry dark storage area. Atmosphere, light,and heat accelerate deterioration of rubber goods. It isalso essential to practice first-in, first-out inventory man-agement when storing packing units. Other significantstorage factors are covered in Section 6.3 of this manual.

I.D. BandNatural Rubber-NR No BandNitrile Rubber-NBR Red Band


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3.1.3 Splitting Packing UnitsPacking unit replacement is also possible with the pipe inthe hole. After removing the worn packing unit, cut the newpacking unit completely and smoothly through one sidebetween any two steel segments preferably 90o fromeyebolt holes to achieve easier handing (refer to Figure 3-2). The cut should be made with a sharp knife as this willnot affect the efficiency of the packing unit. Spring seg-ment apart with a pry bar to put rubber in tension for easiercutting. Do Not use a saw or other rough cutting tool.Spring packing unit open sufficiently to pass around thepipe as shown in Figure 3-2), drop the unit into position inblowout preventer body, and install the head.

NOTE: The packing unit should be split only in the case ofan emergency. The packing unit should be replaced assoon as possible with a unit that has not been split.

Figure 3-2. Proper Method for Cutting ThroughPacking Unit With a Sharp Knife

3.1.2 Packing Unit ReplacementScrewed HeadThe screwed head design of the GK compact blowoutpreventer allows for easy replacement of the packing unitand eliminates loose parts that can be lost downhole oroverboard. To replace the packing unit, refer to Figure 5-1 and follow Steps 5.1.1 and 5.1.3 of the "Disassembly"procedure and Steps 5.2.4 and 5.2.6 of the "Assembly"procedure.

DYNAMIC SEALS STATIC SEALS

DOUBLE U-SEALCross-Section WithNon-ExtrusionRings

SQUARE RINGCross-Section

3.2 SealsThe seal rings for HYDRIL blowout preventers are manu-factured from a special synthetic rubber material for longtrouble-free sealing service. To prevent seal damage, DoNot use synthetic fluids in the hydraulic operating system.The hydraulic operating fluid may be clean, light petroleumhydraulic oil with aniline point higher than 160oF, or waterwith soluble oil added. In cold climates, antifreeze shouldbe added to prevent freezing.

The types of seal rings used are dynamic and static(refer to Figure 3-3). The dynamic seals are double U-seals with non-extrusion rings. The static seals are squarering configuration. Replacement of the seals requiresdisassembly and assembly of the blowout preventer asoutlined in Section 5. For seal maintenance and testing,refer to Section 4.

Figure 3-3. Seal Cross-Section.


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4.1 MaintenancePrior to placing the GK Compact blowout preventer intoservice, the following visual inspections (as noted in Figure4-1) should be performed.1. Inspect the upper and lower connections for pitting,wear, and damageespecially in ring grooves and studbolt holes. Worn or damaged ring grooves must be welded,machined, and stress relieved in a Hydril authorized ma-chine shop.

NOTE: The HYDRIL GK Compact blowoutpreventer is a primary pressure vessel. As supplied,the blowout preventer surfaces exposed to well borefluids meet the requirements for H2S service. Properhandling and repair are required to maintain the origi-nal integrity. Field welding should be avoided as itinduces undesirable stresses which must be relievedby proper heat treating procedures or controlled byspecial welding procedures.2. Check the body for wear and damageespecially in theinternal cylinder walls for pits and vertical scores. Removeminor pits and scores with emery cloth. Coat the repairedsurface with silicone grease or castor oil. Severe pits andscores that require machining and/or welding must berepaired in a Hydril authorized machine shop.

3. Inspect the vertical bore for wear and damage from drillstring and drill toolsespecially in the area of the ringgrooves. If wear is excessive, the area must be repaired.4. Check the inner body sleeve for wear, damage, andlooseness. Check slots in inner body sleeve for cuttingswhich may restrict piston movement.5. Check the piston for damage and wearespecially theseal surfaces for pits and vertical scores and the taperedbowl for pits and gouges.

Remove minor pits and scores on the walls with emerycloth. Coat the repaired surface with silicone grease orcastor oil. Severe pits and scores that require machiningand/or welding must be repaired in a Hydril authorizedrepair facility. Contact Hydril for nearest location. Removesharp or rolled edges with emery cloth or a grinder. Therepair is satisfactory when the surface is relatively smooth.6. Check the wear plate in the inner bottom face of the headfor wear. In addition to the results of time and use, wear ofthis metal surface is produced by the combination ofvertical (upward thrust) and lateral forces. These forces aregenerated each time the packing unit is closed. Typically,wear is severe and is exhibited in the form of grooves orchannels shaped by the steel segments of the packing unit.

4.0 MAINTENANCE AND TESTING

Figure 4-1. Areas and Parts Requiring Maintenance

1

3

8

8

3

1

6

7

5

2

4


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4.2 Seal TestingWhen it is known or suspected that a seal within the GKblowout preventer is leaking, it is recommended that allseals be replaced. However, if only the seal in question isto be replaced, it must first be determined which seal isleaking. To find the leaking seal, refer to Figure 4-2 anduse the following procedure: Seal number callouts refer toFigure 6-1 in Parts and Storage Section.1. Test seals 12 (middle piston) and 10 (lower piston).

a. Pressure closing chamber. The test pressure tobe used in the closing chamber should be the initialclosing pressure required using the recommendedtest mandrel if a packing unit is installed (1500 psi if nopacking unit is installed).b. Open opening chamber to atmosphere.

IF: Closing fluid is seen at well boreseal 10 (lowerpiston) is leaking.

IF: Closing chamber pressure gauge is dropping andfluid is seen at opening chamberseal 12 (middlepiston) is leaking.

2. Test seals 14 (head I.D.), 12 (middle piston), and 9(head O.D.).a. Pressurize opening chamber to 1500 PSI.b. Open closing chamber to atmosphere.

IF: Fluid is seen coming from area between body andheadSeal 9 (head gasket) is leaking.

IF: Fluid is seen coming into wellboreseal 14 (headI.D.) is leaking.

IF: Opening fluid is seen at closing chamberseal 12(middle piston) is leaking.

3. Test seals 14 (head I.D.) and 10 (lower piston).a. Open closing chamber and opening chamber toatmosphere.b. Pressurize wellbore (3000 PSI maximum). NOTE:Blind flange on top is required as packing unit is open.

IF: Fluid is seen at opening chamberseal 14 (head I.D.)is leaking.

IF: Fluid is seen coming from closing chamberseal 10(lower piston) is leaking.

Figure 4-2. Seal Location

Dual U-SealHead I.D. (14)

GasketHead O.D. (9)

The wear plate of the head serves as a bearing surfaceto prevent upward movement of the packing unit. Frictionbetween these metal surfaces is controlled at a level whichdoes not impair lateral movement of the packing unit.Repair of this surface requires replacement of the wearplate.7. Inspect the packing unit for wear, cracking, hardness,

and correct elastomer composition. Refer to Section 3 forpacking unit information and Section 4 for packing unittesting.8. Check the seal rings for nicks, cuts, fraying of lips, andabrasion. Replace worn or damaged seal rings. Refer toSection 4 for seal testing.

Dual U-SealMiddle Piston(12)

Dual U-SealLower Piston(10)


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4.3 Packing Unit TestingProper procedure for pressure testing any annular blow-out preventer ensures subsequent seal off and maximumpacking unit life. Reliable pressure seal off tests are madeby closing the packing unit with prescribed closing cham-ber pressure on recommended size test pipe and bydetermining the remaining piston travel after seal off isachieved. Optimum packing unit life is obtained by testingat low rubber stress levels. Minimum packing unit stressis achieved by use of the minimum closing chamberpressure that will initiate and maintain a seal off on therecommended size test pipe.

4.3.1 Packing Unit TestingSurfaceThe GK compact blowout preventer is designed to be wellpressure assisted in maintaining packing unit seal off onceinitial seal off has been effected. Initial seal off is effectedby applying pressure to the closing chamber. As wellpressure or test pressure is increased, the closing force onthe packing unit also increases.

As well pressure exceeds the required level, thepacking unit is held closed on pipe by well pressure alone.During routine BOP testing, once initial seal off is achieved,closing pressure should be reduced proportionally as wellpressure is increased (see Control Pressure Graph, Fig-ure 1-8/1-8a).

Piston stroke can be measured through a verticalpassage in the top of the BOP head. The maximum andminimum distances from the top of the head to the top ofthe piston are stamped on the BOP head and are listed inthe table below. Piston stroke remaining at seal off is adirect indicator of remaining packing unit life. Record thepiston stroke and the closing pressure at initial seal off foreach test. Compare with previous results and with maxi-mum piston stroke for the BOP to ensure subsequent sealoffs. A valid test on the BOP is achieved only when theremaining piston stroke is measured at test seal off.

Figure 4-3. Piston Stroke Measurement

1

2

3

4

TAPE MEASURE

5/16" (8mm)ROD

Distance From Top of Head to Top of Piston

Piston Position 5000 PSI

Maximum 13.50 in.(piston in full down position) 343 mm

Minimum . 5 in.(piston at full stroke) 127 mm


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5.0 DISASSEMBLY AND ASSEMBLY

5.1 DisassemblyRefer to Figure 5-1 while following this procedure.

5.1.1 Remove the Head (Item 2).1. Close and open the packing unit to break loose any

accumulation of drilling fluid or debris which mayrestrict the full downward travel of the piston.

2. Vent the opening and closing chambers to atmo-sphere ensuring that no trapped pressure exists whichwill cause damage to personnel and/or equipment.

3. Open valves in the control system to have an exhaustand/or loosen hydraulic connections to allow leakage.WARNING: STAND CLEAR OF ESCAPING PRES-SURE TO AVOID INJURY!

4. Release the head by removing the head lock screw(item 8).

5. Install two 1 -8UNC eyebolts in the top of the head inthe holes provided.

6. Rotate the head approximately 10 turns counterclock-wise to release it. Then, lift the head clear of the BOP.NOTE: Use a 10 to 12-foot long piece of strong pipe(3-4" in diameter) or a rod as a lever against theeyebolts to apply force to the head. A vertical lift maybe applied to the eyebolts to take the weight of thehead off of the threads while applying force to thehead. The lift will reduce the required opening force.If the head was improperly installed at the last reas-sembly, it may be necessary to apply considerablymore force on the head by the use of a winch or catlinewhile alternately applying and releasing pressure tothe opening chamber (600 - 800 psi maximum).CAUTION: DO NOT attempt to loosen the head byapplying heat on the thread area.

5.1.2 Remove the Wear Plate (Item 6).1. Remove the cap screws (item 7) from the wear plate.2. Remove the wear plate.

5.1.3 Remove the Packing Unit (Item 19).1. Install two 5/8"-1 1 UNC eyebolts into the packing unit.2. Lift the packing unit out of the piston. Use a sling of

adequate length to prevent side loading of the eye-bolts.

5.1.4 Remove the Piston (item 3).1. Install two 5/8"-11UNC eyebolts in the top of piston.2. Place a wooden spacer block (approximately 1/2"

thick) between each eyebolt and the piston wall toprotect the sealing surface of the piston.

3. Gently lift the piston to free it from the preventer body.If the piston does not lift out freely, slowly apply low (50psi) hydraulic pressure to the closing chamber.CAUTION: DO NOT USE AIR OR GAS!

5.1.5 Remove the Slotted Sleeve (Item 4).1. Remove the cap screws (item 5) from the slotted

sleeve.2. Lift out the slotted sleeve with a sling and hooks under

the slots.

5.2 Assembly5.2.1 Clean and Inspect All Parts Before Assembly.1. Ensure that working surfaces are free of burrs, rough

edges, and other defects.2. Inspect all seals and replace any damaged seals or

seals in use over one year. Hydril recommends headgasket replacement whenever the head is removed.IMPORTANT: Seal rings MUST BE installed in posi-tions shown by the cross-section (Figure 5-1)!

3. Lubricate all seal rings prior to installation with castoroil or silicon grease. Lubricate the packing unit andinternal metal surfaces with castor oil. CAUTION: Useof petroleum base oil or grease will reduce seal life.Lubricate cap screw threads with Never-Seize threadlubricant.

5.2.2 Install the Slotted Sleeve (Item 4).1. Install the slotted sleeve into the inside bottom of the

blowout preventer body.2. Install the cap screws (item 5) and torque to 50 lb-ft (68

Nm).

5.2.3 Install the Piston (Item 3).1. Lubricate and install the lower U-seals (items 10 and

11) into the seal grooves in the lower segment of thepiston.

2. Lubricate and install the middle U-seals (items 12 and13) in the seal grooves in the middle segment of thepiston.

3. Install two 5/8"-11 UNC eyebolts in top of the pistonwith wooden spacer blocks between the eyebolt andthe piston wall.

4. Lubricate all mating surfaces before lowering the pis-ton into the body.

5. Install the piston into the preventer body. Align thepiston vertically with the body prior to lowering thepiston. After proper alignment is made, the weight ofthe piston alone will cause the piston to travel its fullnormal stroke to the bottom of the preventer body.CAUTION: Be careful to prevent seal damage duringassembly.

6. Remove the eyebolts and spacer blocks.

5.2.4 Install the Packing Unit (Item 19).1. Lubricate the piston bowl with castor oil.2. Lift the packing unit with two 5/8-11 UNC eyebolts and

set it into the piston bowl that is already installed in thepreventer.


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Figure 5-1. Cutaway View of Compact GK for Disassembly and Assembly

Head Lock Screw (8)

Body (1)

Head (2)

HoistRing (18)

Packing Unit (19)

Slotted Sleeve (4)

Pipe Plug (26)

Head Gasket (9)

Double U-Seal(14, 15)



Wear Plate Cap Screw (8)

3. Remove the eyebolts from packing unit.

5.2.5 Install the Wear Plate (Item 6).1. Position the wear plate on the head.2. Install the cap screws (item 7) and torque to 50 lb-ft (68

Nm).

5.2.6 Install the Head (Item 2).1. Lubricate and install the upper U-seals (items 14 and

15) and the head gasket (item 9) onto the head.2. Clean any foreign matter from the threads and remove

burrs or rough edges with emery cloth or light grinding.3. Apply a generous coating of zinc base (lead-free) tool

joint lubricant to the threads of the head and body. Thislubrication will ensure easy removal of the head at the

next disassembly.4. Locate and mark hole in body for the head lock screw

(item 8).5. Lift the head using the two 1 -8UNC eyebolts and a

chain sling assembly.6. Align the thread lead of the head with the thread lead

in the body.7. Screw the head clockwise into the body until it shoul-

ders against the top of the body.8. Line up the lock screw hole in the head with the hole in

the body.9. Install the head lock screw (item 8) and torque to 50 lb-

ft (68 Nm).10. Remove the eyebolts from the head.

Wear Plate (7)

Piston (3)


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6.0 PARTS AND STORAGE

6.1 Parts List (Figure 6-1)Part

NumberNo.

Req.Part NameItem

No.

Pipe Plug, Hyd Connection 2 1900065-07 Protector Cover 1 3113411-38 Chain Sling Assembly 1 1900179-0260 Lifting Device, Piston 2 3129285 Eyebolt, Head 2 3117168 Ring Gasket 2 1920103-160

t Recommended spares for one year foreign service. NOTE:Seal kit contains items 9 - 15. Packing Unit is not part of sealkit.

1 Body 1 31290042 Head 1 31290233 Piston 1 31290274 Slotted Sleeve 1 31290295 Cap Screw, Sleeve 6 1920026-120126 Wear Plate 1 10017887 Cap Screw, Wear Plate 6 1920097-080068 Lock Screw, Head 1 1002149

t 9 Head Gasket 1 38150t10 U-Seal, Lower Piston 1 3129413t11 Non-Extrusion Ring 2 3129415t12 U-Seal, Middle Piston 1 3129417t13 Non-Extrusion Ring 2 3129419t14 U-Seal, Head 1 3130166t15 Non-Extrusion Ring 2 3130164

16 Top Connection Stud Bolt 16 1900491-1306617 Nut, Top Connection 16 1900490-1318 Hoist Ring 4 1920752-7

t19 Packing Unit NR 1 1003263-01Packing Unit NBR 1 1003263-02

20 Name Plate 1 192004221 Tag, Opening Chamber 1 100253522 Tag, Closing Chamber 1 100253623 Drive Screw 12 1900061-1224 Hydril Name Plate 1 100239025 Cap Screw, Name Plate 2 1900097-0600626 Pipe Plug, Piston Indicator 1 1900065-05

t Seal Kit 1 3130391ACCESSORIES


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Figure 6-1. Cutaway View for Parts Identification

8

1

17

18

19

4

9

15

6

26

15

14

13

13

12

11

11

10

3

12

16

2

22

21

20

25

24

23

7


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6.2 Preventer StorageAt the conclusion of each well or prior to placing the blowoutpreventer in storage for even a brief period, it is recom-mended that the preventer be disassembled, cleaned,inspected, lubricated thoroughly with non-petroleum baseoil such as castor oil, silicon oil, or rapeseed oil, andreassembled. Replacement of worn packing units, orpackers, seal rings, and other parts can be made conve-niently at this time.

Flange or hub faces and ring grooves should beprotected with covers, and ports should be plugged.

6.3 Rubber Goods StorageThe term rubber goods includes synthetic compounds suchas Nitrile Copolymers and Neoprene, as well as naturalrubber parts.

The ideal storage situation for rubber goods would bein vacuum-sealed containers maintained in a cool, dry,dark storage area.

The following recommendations will allow vendorsand users of oil field equipment to maximize normallyavailable storage facilities for rubber goods:

1. Keep the rubber storage area as dark as possiblepreferably indoors, not outdoors, and away from directsunlight, skylights, windows, and direct artificial lighting.

2. Select a cool location (approximately 65oF) that isaway from heaters, stoves, and direct blasts of spaceheaters.

3. Keep rubber goods away from electrical machinery(motors, switch gear, or any high voltage equipment pro-ducing corona). Avoid locations susceptible to drafts thatwill carry the atmosphere from electrical machinery to therubber goods storage area.

4. The practice of first-in, first-out inventory manage-ment is essential with rubber goods.

5. Store rubber goods in a relaxed position in theirnormal shape. For example, do not hang O-rings on nails.Do not keep assemblies in stretched attitudes, e.g., O-ringson glands, BOP testers, and operator parts.

6. Rubber goods storage areas should be kept as dryas possible. Remove oil, grease or other foreign materialsfrom the storage area to preclude spillage on rubber goods.

7. If storage for extended periods is anticipated, sealedcontainers are recommended. Impervious surface cover-ings such as waxing will increase shelf life.

Factors that accelerate the deterioration of rubbergoods are atmosphere, light, and heat. The term agingmeans cumulative effects of all three attacking agents overa period of time. Other factors that will affect rubber goodsinclude stretching or bending from normal shape, extremecold, chemical reactions with solvents and petroleum prod-ucts.

Exposure to the atmosphere allows oxygen to reactwith the rubber goods. Ozone (O3), a very active form ofoxygen, is especially detrimental to rubber goods. Theprincipal sources of ozone contributing to rubber goodsdeterioration (1) atmospheric ozone, and (2) ozone cre-

ated by electrical discharges such as lighting, high voltagecorona, or electrical machinery. Points of strain in rubbergoods are attacked first by ozone and will be characterizedby deep cracks. Ozone and normal oxygen (O2) will attackrubber goods much as steel rusts. Oxidation is character-ized by a hard skin which eventually crazes in small cracksand may turn chalky or assume a bark-like appearance.

Strong, direct light, especially sunlight, has a harmfuleffect on rubber goods. The ultraviolet content of the lightspectrum accelerates cracking. Light, especially sunlight,is undesireable and should be avoided at all times.

Heat, whether the result of sunlight, artificial or acci-dental heating, will also have harmful effects upon rubbergoods. Heat results in a gradual hardening of the rubbergoods. The process is greatly accelerated when ozone oroxygen is present.

In extremely cold climates, some rubber goods will become so brittle that they will shatter when dropped orhandled roughly.

Any stretching or bending of rubber goods in storagefrom a relaxed, normal shape will result in acceleratedaging or cracking.

Rubber goods, both natural and synthetic, possesssome degree of susceptibility to deterioration from varioussolvents, especially oil field liquid hydrocarbons. Thesematerials cause swelling/shrinkage of the rubber goodswith which they are in contact.

Since the aging of a rubber product is dependent uponall of the above factors plus its size, specific composition,and function, no precise figure is available for storage life.Generally, the greater the ratio of surface area to volume,the more susceptible a part is to being rendered useless byaging. For example, a relatively large part (by volume),such as a packing unit, might be expected to have a muchlonger useful shelf life than a thin-walled, large-diameter O-ring.

No general rule can be drawn regarding usability. Alarge, heavy part might suffer the same total amount ofaging as a small, light piece and still be usable, whereas thelight piece would be rendered useless. Thus, judgementbecomes the rule and where there is doubt - replace thepart.

Prior to using rubber goods that have been stored forperiods of time, these checks should be made:

1. Is there chalking or barking?2. Has the part developed a hard skin?3. Do cracks appear? Do cracks appear when the part

is stretched? (Sometimes cracks will be obvious; stretch orbend the part in question so that any incipient cracks or verythin cracks will be revealed).

4. Will suspect part pass a hardness test with a ShoreA Durometer? (In the event that the hardness runs 15points higher than the normal hardness of the part, it isconsidered nonusable). NOTE: Hardness is affected bytemperature, and readings should be taken with the rubberpart at 70o to 100oF. The hardness measurement shouldbe made on a flat surface of the rubber part having aminimum thickness of 1/4 inch.


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Worldwide Sales, Service, and ManufacturingCanada, Alberta, CalgarySales OfficeHydril Canadian Company, Ltd.First Executive Centre350 7th Avenue S.W., Suite 3000Calgary, Alberta T2P3N9CanadaTelephone: (403) 531-1590Fax: (403) 264-0585

Canada, Alberta, EdmontonSales Office, Field Service,Manufacturing PlantHydril Canadian Company, Ltd.2307 8th StreetNisku, Alberta T9E7Z3CanadaTelephone: (403) 955-2045Fax: (403) 955-7627

Indonesia, BatamManufacturing PlantP.T. Hydril IndonesiaKabil Industrial EstateJl. Hang Kesturi 1 Kav. 23 & 24Kabil - BatamIndonesiaTelephone: 62-778-711318Fax: 62-778-711112

Mexico, Mexico CitySales Office, Field ServiceHydril S.A. de C.V.Genova 20-302Col. Juarez C.P. 06600Mexico, D.F.MexicoTelephone: +52-5-208-7208Fax: +52-5-208-7861

Mexico, Ciudad del CarmenSales Office, Field ServiceHydril S.A. de C.V.Calle 38 x 61 Num. 263Cd. del Carmen,CampecheC.P. 24120Telehone: +52-938-21085;

+52-938-210523Fax: +52-938-26942

Mexico, RenosaSales Office, Field ServiceHydril S.A. de C.V.Chihuahua No. 1192-Aesq. CuliacanCol. Rodriguez, ReynosaTamaulipasC.P. 88630 MexicoTelephone: +52-89-252360

+52-89-252361Fax: +52-89-252362

Mexico, VeracruzManufacturing PlantHydril S.A. de C.V.Av. Araucarias Mz. XIILote 1Cd. Industrial Bruno PagliaiVeracruz,C.P. 91697 MexicoTelephone: +52-29-810213Fax: +52-29-810102

HeadquartersHydril Company

P.O. Box 60458 Houston, TX 77205-04583300 N. Sam Houston Parkway E. Houston, TX 77032-3411

Telephone: (281) 449-2000 Fax: (281) 985-2828

1-800-999-1601Toll Free in the U.S.A. and Canada

www.hydril.com

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Mexico, VillhermosaSales Office, Field ServiceHydril S.A. de C.V.Av. Gregorio Mendez #836Colonia Centro 1Villahermosa, TabascoMexico 86000Telephone: +52-931-449-44

+52-931-449-42Fax: +52-931-225-06

Nigeria, Port HarcourtSales Office, Field ServiceHydril Africa/TDPS4 Evergreen StreetOgbonda EstatePort HarcourtNigeriaTelephone:

234-84-332281 (Pressure)234-84-611201 (Tubular)

Fax: 871-762-154-648

Nigeria, WarriSales Office, Field ServiceService CenterHydril Africa/TDPSF21 Idugboe EstateOgunu, WarriNigeriaTelephone:

234-53-252-565 (Pressure)871-762-154-478 (Tubular)

Fax: 871-762-154-480

Republic of Singapore,SingaporeSales Office, Field Service,Hydril Private Ltd.27 Benoi SectorSingapore 629859Republic of SingaporeTelephone: +65-261-2566Fax: +65-261-2502 (Pressure)

+65-261-0204 (Tubular)

United Kingdom,Aberdeen, ScotlandSales Office, Field Service,Manufacturing PlantHydril U.K. Ltd.Minto AvenueAltens Industrial EstateAberdeen, AB1 3JZScotlandTelephone: +44-1224-878-824Fax: +44-1224-898-524

United Kingdom,Aberdeen, ScotlandHydril International TubularSalesMinto AvenueAltens Industrial EstateAberdeen, AB1 3JZScotlandTelephone: +44-1224-299-554Fax: +44-1224-299-578

U.S.A., Alaska, AnchorageSales Office, Field Service,Hydril Company7900 King StreetAnchorage, AK 99518Telephone: (907) 522-2550Fax: (907) 522-1995

U.S.A., CaliforniaBakersfieldSales Office, Field Service,Service CenterHydril Company3237 Patton WayBakersfield, CA 93308-5717Telephone: (661) 588-9332Fax: (661) 588-2550

U.S.A., Louisiana,LafayetteSales Office, Field Service,Service CenterHydril Company101 Derick RoadBroussard, LA 70518-7114Telephone: (318) 837-6654Fax: (318) 837-8988

U.S.A., Louisiana,WestwegoManufacturing PlantHydril Company201 KleinWestwego, LA 70094Telephone: (504) 348-3348Fax: (504) 348-3629

U.S.A., Texas,Corpus ChristiSales Office, Field Service,Hydril Company730-F Diamond Cut RoadCorpus Christi, TX 78409Telephone:

(512) 289-5031 (Pressure)(512) 289-5034 (Tubular)

Fax: (512) 289-0258

U.S.A., Texas, HoustonHydril Elastomer & IndustrialProductsManufacturing PlantHydril CompanyP.O. Drawer 1888Humble, TX 77347-188818000 Eastex FreewayHumble, TX 77347-1888Telephone: (281) 446-0041Fax: (281) 446-4709

U.S.A., Texas, HoustonHydril Technology Center,Sales Office, Field Service,Manufacturing PlantHydril CompanyP.O. Box 60458Houston, TX 77205-04583300 N. Sam Houston Parkway E.Houston, TX 77032-3411Telephone: (281) 449-2000Fax: (281) 985-2828Toll Free: (800) 231-0023

U.S.A., Texas, HoustonField Service, ManufacturingMcCarty PlantHydril Company302 McCarty DriveHouston, TX 77029Telephone: (713) 672-3502Fax: (713) 672-3525

U.S.A., Texas, HoustonManufacturingValvcon Manufacturing PlantHydril Company3300 N. Sam Houston Parkway E.Houston, TX 77032-3411Telephone: (281) 449-2000Fax: (281) 985-3262

U.S.A., Texas, OdessaPermian Sales Office, FieldService,Hydril Company8317 Andrews HighwayOdessa, TX 79768Telephone: (915) 552-7850Fax: (915) 366-6501

U.S.A., Wyoming, CasperSales Office, Service CenterHydril CompanyP.O. Box 124Casper, WY 826023501 North PoplarCasper, WY 82601Telephone: (307) 266-2120Fax: (307) 234-2192

Venezuela, Puerto La CruzSales Office, Field ServiceAv. IntercomunalC.C. Colonial, Piso 1, Oficina 7Barcelona, AnzoatequiVenezuelaTelephone: +58-81-762083

+58-81-741651Fax: +58-81-761-271


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Anular Gk13-5 (0101a)Compact

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