02- valves
DESCRIPTION
VALVESTRANSCRIPT
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 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)
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 TestingGATE valves
WOM
Surface TestingGATE valves
WOM
Surface TestingGATE valves
GATE
WOM
metal/metal seal
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
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
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
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)
Cross Section of a Mapegaz valve
(Spherical)
(white teflon ring)
•Sealing=
white teflon ring seal
Mapegaz
Surface TestingBALL valve (spherical)
Gachot
•Medium pressure
•Sampling / bleed-off points
•Sealing= white teflon seal ring
•Standard sizes=
¼”, ½”, ¾”, 1”
Surface Testing
Seats (black teflon)
Plug (cylindrical)
stem
top hexagonal nut
PLUG valve (cylindrical)O-ring
Texseal
•Sealing=
black teflon seat
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 valvesFisher
•Used for flow control + throttle action
•Medium pressure
•Separator, Surge tank
•Sealing (not 100%)= metal/metal
•Standard sizes= 1”, 2”, 3”,4”
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
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
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”
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.
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.
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.
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.
Surface Testing
VALVES
The END