01- Valves -d

FTC-SWT April 20, 2023

Surface Testing

VALVES


Surface Testing

VALVES

•Valves or taps are devices fitted to piping or equipment and designed to control the flow of fluids.

•ex: a 3” gate, ball or butterfly valve, means a 3” ID


Surface TestingVALVESHIGH pressure

(5000 psi and above)MEDIUM

pressure (~1500 psi)

LOW pressure (~180 psi)

FlowheadChoke manifold, Sand-trapHeater & Steam-exchanger

SeparatorsOil/Gas manifoldsPumps, Burners

Tanks

1)GATE valves2)NEEDLE valves (~sampling~)

1)BALL valves2)PLUG valves

1)BUTTERFLY2)GLOBE valves

1)WOM new, (McEvoy, Malbranque, Sereg old)2)Kerotest, Autoclave

1)Mapegaz, Gachot2)Texseal, Balon


Surface TestingGATE valves

•Used for shut off, (on/off function)

•High pressure (5, 10, 15, 20Kpsi)

•ex: FH, CM, Steam-exchanger, Sand-trap

•Sealing method:

-metal/metal for WOM valve

-grease sealing compound for McEvoy valve

•Standard sizes= 3 1/16” to 4 1/16”


Surface Testing

WOM

GATE valves



WOM

metal seals

Grease Fitting (for storage only)

GateSeal assembly with 0-ring



WOM

GATE

metal/metal seal



McEvoy

Surface Testing

VALVE CLOSED

Grease fittings for

Special sealing compound grease

Grease fitting for standard grease

Sealing done with the special grease

(pressure trapped)



McEvoy

Surface Testing

• possibility to inject grease under pressure

• self-greasing/sealing under pressure with valve closed

seat

gates

seat

reservoir

bottom grease fitting for normal grease only

reservoir


Surface Testing

•Used for shut off, (on/off) + Flow control (bleed off part of flow)

•High pressure (5, 10, 15, 20Kpsi)

•ex: instrumentation on FH, CM, Steam-exchanger, Sand-trap

•Kerotest (up to 10Kpsi)

•Autoclave Engineers (10, 15, 20K)

•Sealing method: metal/metal

(~sizes= ¼”, ½”, ¾”)

NEEDLE valves


Surface TestingBALL / PLUG valves

•Used for shut off, (on/off)

•¼ turn

•Medium pressure (~1500 psi)

•ex: separator, burners, pumps, etc.

•Sealing method:

-PTFE (Teflon) seal ring or seat

Standard sizes= 1” to 4”


Surface TestingBALL valve (spherical)

Mapegaz

Cross Section of a Mapegaz valve

(Spherical)

(white teflon ring)

•Sealing=

white teflon ring seal


Surface TestingBALL valve (spherical)

Gachot•Medium pressure

•Sampling / bleed-off points

•Sealing= white teflon seal ring

•Standard sizes=

¼”, ½”, ¾”, 1”


Surface TestingPLUG valve (cylindrical)

Texseal

•Sealing=

black teflon seat

Seats (black teflon)

Plug (cylindrical)

O-ring

stem

top hexagonal nut


Surface TestingBUTTERFLY valve

Weco

•Used for shut off, (on/off)

•Low pressure

•Tanks

•Sealing= rubber seal

•Standard sizes= 1”, 2” 3”


Surface TestingGLOBE valves

•Used for control of flow and shut off

•Low pressure

•Rig Water / air lines

•Sealing= metal/metal

•Standard sizes= 1”, 2” 3”


Surface TestingAutomatic Control valves

•Used for flow control + throttle action

•Medium pressure

•Separator, Surge tank

•Sealing (not 100%)= metal/metal

•Standard sizes= 1”, 2”, 3”,4”

Fisher


Surface TestingSwing check valves

•To allow flow in one direction only

•High/Medium/Low pressure

•Separator inlet, pump outlet



Flow through valve

Flow ceases or fails below back pressure

CHECK valves


Surface TestingRELIEF valves

•Spring loaded and set to open at a given pressure to protect systems from over pressure


•Separator, flowlines, Steam-exchanger, Surge-tank



Farris


Surface TestingRELIEF valves

•Piloted safety relief valves


•New Separator and Surge-tank


•Standard sizes= 3”,4”, 6”

Anderson Greewood


Surface TestingSAFETY

GATE / BALL / PLUG valves:

• must not be used for throttling (i.e.: must be fully open or fully closed) because a restricted flow through it will erode the seal or gate or seat, and the valve will not seal correctly / reliably.



GATE valves:

• it is common practice to count the number of turns taken to open / close a valve because the operator can tell if the valve has become plugged or is not seating correctly.



GATE / GLOBE valves:

• it is best to close the gate and globe valves by ¼ turn after they are fully opened and vice-versa because over tightening the valve upon closing may damage the disk and seat. Leading to seizure or leakage.



NEEDLE valves:

• when used with an instrument, the valve should only be opened enough: - to permit flow and allow the instrument to register correctly. - to allow a quick closure of the valve and to isolate the dial gauge in case of a sudden increase of pressure, above the range of the gauge.

One or two turns is usually sufficient.


Surface Testing

VALVES

The END

01- Valves -d

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