FTC-SWT April 20, 2023

Surface Testing

VALVES

FTC-SWT April 20, 2023

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

FTC-SWT April 20, 2023

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

FTC-SWT April 20, 2023

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”

FTC-SWT April 20, 2023

Surface Testing

WOM

GATE valves

FTC-SWT April 20, 2023

Surface TestingGATE valves

WOM

metal seals

Grease Fitting (for storage only)

GateSeal assembly with 0-ring

FTC-SWT April 20, 2023

Surface TestingGATE valves

WOM

GATE

metal/metal seal

FTC-SWT April 20, 2023

Surface TestingGATE valves

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)

FTC-SWT April 20, 2023

Surface TestingGATE valves

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

FTC-SWT April 20, 2023

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

FTC-SWT April 20, 2023

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”

FTC-SWT April 20, 2023

Surface TestingBALL valve (spherical)

Mapegaz

Cross Section of a Mapegaz valve

(Spherical)

(white teflon ring)

•Sealing=

white teflon ring seal

FTC-SWT April 20, 2023

Surface TestingBALL valve (spherical)

Gachot•Medium pressure

•Sampling / bleed-off points

•Sealing= white teflon seal ring

•Standard sizes=

¼”, ½”, ¾”, 1”

FTC-SWT April 20, 2023

Surface TestingPLUG valve (cylindrical)

Texseal

•Sealing=

black teflon seat

Seats (black teflon)

Plug (cylindrical)

O-ring

stem

top hexagonal nut

FTC-SWT April 20, 2023

Surface TestingBUTTERFLY valve

Weco

•Used for shut off, (on/off)

•Low pressure

•Tanks

•Sealing= rubber seal

•Standard sizes= 1”, 2” 3”

FTC-SWT April 20, 2023

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”

FTC-SWT April 20, 2023

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

FTC-SWT April 20, 2023

Surface TestingSwing check valves

•To allow flow in one direction only

•High/Medium/Low pressure

•Separator inlet, pump outlet

•Sealing= metal/metal

•Standard sizes= 1”, 2”, 3”,4”

Flow through valve

Flow ceases or fails below back pressure

CHECK valves

FTC-SWT April 20, 2023

Surface TestingRELIEF valves

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

•High/Medium/Low pressure

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

•Sealing= metal/metal

•Standard sizes= 1”, 2”, 3”,4”

Farris

FTC-SWT April 20, 2023

Surface TestingRELIEF valves

•Piloted safety relief valves

•High/Medium/Low pressure

•New Separator and Surge-tank

•Sealing= metal/metal

•Standard sizes= 3”,4”, 6”

Anderson Greewood

FTC-SWT April 20, 2023

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.

FTC-SWT April 20, 2023

Surface TestingSAFETY

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.

FTC-SWT April 20, 2023

Surface TestingSAFETY

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.

FTC-SWT April 20, 2023

Surface TestingSAFETY

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.

FTC-SWT April 20, 2023

Surface Testing

VALVES

The END