Download - 02- Valves
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Surface Testing
VALVES
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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
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Surface TestingVALVES
1)Mapegaz, Gachot2)Texseal, Balon
1)WOM new, (McEvoy, Malbranque, Sereg old)2)Kerotest, Autoclave
1)BUTTERFLY2)GLOBE valves
1)BALL valves2)PLUG valves
1)GATE valves2)NEEDLE valves (~sampling~)
TanksSeparatorsOil/Gas manifoldsPumps, Burners
FlowheadChoke manifold, Sand-trapHeater & Steam-exchanger
LOW pressure (~180 psi)
MEDIUM pressure (~1500 psi)
HIGH pressure (5000 psi and above)
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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”
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Surface TestingGATE valves
WOM
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Surface TestingGATE valves
WOM
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Surface TestingGATE valves
GATE
WOM
metal/metal seal
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Surface TestingSurface Testing
(pressure trapped)
GATE valves
McEvoy
Sealing done with the special grease
Grease fittings for
Special sealing compound grease
Grease fitting for standard grease
VALVE CLOSED
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Surface TestingSurface Testing
• possibility to inject grease under pressure
• self-greasing/sealing under pressure with valve closed
gates
seat
reservoir
bottom grease fitting for normal grease only
reservoir
GATE valves
seatMcEvoy
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Surface TestingNEEDLE valves
(~sizes= ¼”, ½”, ¾”)
•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
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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”
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Surface TestingBALL valve (spherical)
Cross Section of a Mapegaz valve
(Spherical)
(white teflon ring)
•Sealing=
white teflon ring seal
Mapegaz
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Surface TestingBALL valve (spherical)
Gachot
•Medium pressure
•Sampling / bleed-off points
•Sealing= white teflon seal ring
•Standard sizes=
¼”, ½”, ¾”, 1”
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Surface Testing
Seats (black teflon)
Plug (cylindrical)
stem
top hexagonal nut
PLUG valve (cylindrical)O-ring
Texseal
•Sealing=
black teflon seat
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Surface TestingBUTTERFLY valve
Weco
•Used for shut off, (on/off)
•Low pressure
•Tanks
•Sealing= rubber seal
•Standard sizes= 1”, 2” 3”
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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”
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Surface TestingAutomatic Control valvesFisher
•Used for flow control + throttle action
•Medium pressure
•Separator, Surge tank
•Sealing (not 100%)= metal/metal
•Standard sizes= 1”, 2”, 3”,4”
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Surface TestingSwing check valves
Flow through valve
•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 ceases or fails below back pressure
CHECK valves
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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
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Surface TestingRELIEF valves
Anderson Greewood
•Piloted safety relief valves
•High/Medium/Low pressure
•New Separator and Surge-tank
•Sealing= metal/metal
•Standard sizes= 3”,4”, 6”
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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.
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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.
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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.
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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 instrumentation in case of a sudden increase of pressure.
One or two turns is usually sufficient.
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Surface Testing
VALVES
The END