Surface Testing
VALVES Schlumberger Private
Valves – slide 1
Surface Testing
VALVES
•ex: a 3” gate, ball or butterfly valve, means a 3” ID Valves – slide 2
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•Valves or taps are devices fitted to piping or equipment and designed to control the flow of fluids.
VALVES HIGH pressure (5000 psi and above)
Surface Testing MEDIUM pressure (~1500 psi)
LOW pressure (~180 psi)
Separators Oil/Gas manifolds Pumps, Burners
Tanks
1)GATE valves 2)NEEDLE valves (~sampling~)
1)BALL valves 2)PLUG valves
1)BUTTERFLY 2)GLOBE valves
1)WOM new, (McEvoy, Malbranque, Sereg old) 2)Kerotest, Autoclave
1)Mapegaz, Gachot 2)Texseal, Balon
Valves – slide 3
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Flowhead Choke manifold, Sand-trap Heater & Steam-exchanger
GATE valves
Surface Testing
•Used for shut off, (on/off function)
•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 Valves – slide 4 1/16”
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•High pressure (5, 10, 15, 20Kpsi)
GATE valves
Surface Testing
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WOM
Valves – slide 5
GATE valves
Surface Testing Gate Seal assembly with 0-ring
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WOM
Grease Fitting (for storage only)
metal seals
Valves – slide 6
GATE valves GATE
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WOM
Surface Testing
WOM.exe metal/metal seal
Valves – slide 7
GATE valves
Surface Testing Surface Testing
McEvoy
Sealing done with the special grease
Grease fittings for Special sealing compound grease
Grease fitting for standard grease VALVE CLOSED Valves – slide 8
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(pressure trapped)
reservoir
GATE valves
Surface Testing Surface Testing reservoir
McEvoy
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seat gates
• possibility to inject grease under pressure
seat
• selfgreasing/sealing under pressure with valve closed
bottom grease fitting for normal grease only
Valves – slide 9
NEEDLE valves
Surface Testing
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•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, Sandtrap •Kerotest (up to 10Kpsi) •Autoclave Engineers (10, 15, 20K) Valves – slide 10
(~sizes= ¼”, ½”, ¾”)
BALL / PLUG valves
Surface Testing
•Used for shut off, (on/off) Schlumberger Private
•¼ turn •Medium pressure (~1500 psi) •ex: separator, burners, pumps, etc. •Sealing method: -PTFE (Teflon) seal ring or seat Standard sizes= 1” to 4” Valves – slide 11
BALL valve (spherical)
Surface Testing
Mapegaz (white teflon ring) (Spherical)
white teflon ring seal
Cross Section of a Mapegaz valve Valves – slide 12
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•Sealing=
BALL valve (spherical)
Surface Testing
Gachot Schlumberger Private
•Medium pressure •Sampling / bleedoff points •Sealing= white teflon seal ring
•Standard sizes= ¼”, ½”, ¾”, 1” Valves – slide 13
Surface Testing
PLUG valve (cylindrical) Texseal
top hexagonal nut
O-ring
•Sealing= black teflon seat
Plug (cylindrical)
Valves – slide 14
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Seats (black teflon)
stem
BUTTERFLY valve
Surface Testing
Weco Schlumberger Private
•Used for shut off, (on/off) •Low pressure •Tanks •Sealing= rubber seal •Standard sizes= 1”, 2” 3”
Valves – slide 15
GLOBE valves
Surface Testing
•Low pressure
•Rig Water / air lines •Sealing= metal/metal •Standard sizes= 1”, 2” 3”
Valves – slide 16
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•Used for control of flow and shut off
Automatic Control valves
Surface Testing
Fisher Schlumberger Private
•Used for flow control + throttle action •Medium pressure •Separator, Surge tank •Sealing (not 100%)= metal/metal •Standard sizes= 1”, 2”, 3”,4” Valves – slide 17
Swing check valves
Surface Testing Flow through valve
•High/Medium/Low pressure
Flow ceases or fails below back pressure
•Separator inlet, pump outlet
•Sealing= metal/metal •Standard sizes= 1”, 2”, 3”,4” CHECK valves
Valves – slide 18
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•To allow flow in one direction only
Surface Testing
RELIEF Farrisvalves
•High/Medium/Low pressure •Separator, flowlines, Steamexchanger, Surge-tank
•Sealing= metal/metal •Standard sizes= 1”, 2”, 3”,4”
Valves – slide 19
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•Spring loaded and set to open at a given pressure to protect systems from over pressure
RELIEF valves
Surface Testing
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•Piloted safety relief valves •High/Medium/Low pressure •New Separator and Surge-tank
•Sealing= metal/metal •Standard sizes= 3”,4”, 6”
Anderson Greenwood Valves – slide 20
SAFETY
Surface Testing
GATE / BALL / PLUG valves:
Valves – slide 21
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• 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.
SAFETY
Surface Testing
GATE valves:
Valves – slide 22
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• 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.
SAFETY
Surface Testing
GATE / GLOBE valves:
Valves – slide 23
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• 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.
SAFETY
Surface Testing
NEEDLE valves:
Valves – slide 24
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• when used with an instrument, the valve should only be opened enough: - to permit flow and allow the instrument to 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 – slide 25
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VALVE S The END