API RP 53:1997 pdf download
API RP 53:1997 pdf download.Recommended Practices for Blowout Prevention Equipment Systems for Drilling Wells.
3.1.40function test: Closing and opening (cycling)equipment to verify operability.
3.1.41gate valve: A valve that employs a sliding gate toopen or close the flow passage.The valve may or may not befull opening.
3.1.42hang off: An action whereby that portion of thedrill string below the ram BOP remains in the hole supportedby a tool joint resting atop the closed pipe rams.
3.1.43hydrogen sulfide (H,S): A highly toxic, flamma-ble,corrosive gas sometimes encountered in hydrocarbonbearing formations.
3.1.44hydrogen sulfide equipment service: Equip-ment designed to resist corrosion and hydrogen embrittle-ment caused by exposure to hydrogen sulfide (H,s).
3.1.45hydrostatic head: The pressure that exists at anypoint in the wellbore due to the weight of the column of fluidabove that point.
3.1.46insert type (packer) diverter: A diverter assem-bly whose body does not require disassembly to utilize inter-changeable packing elements that are specifically sized forthe pipe diameter in use in the hole.
3.1.47inside blowout preventer (BOP): A device thatcan be installed in the drill string that acts as a check valveallowing drilling fluid to be circulated down the string butprevents back flow.
3.1.48integral valve: A valve cmbodied in the diverterunit that operates integrally with the annular sealing device.3.1.49interlock: An arrangement of control system func-tions designed to require the actuation of one function as aprerequisite to actuate another function. Also referred to assequencing.
3.1.50kelly cock: A valve immediately above the kellythat can be closed to confine pressures inside the drill sting.3.1.51kelly valve,lower: An essentially full-openingvalve installed immediately below the kelly.with outsidediameter equal to the drill pipe tool joint outside diameter.This valve can be closed under pressure to remove the kellyand can be stripped into the hole for snubbing operations.Note: Some lower kelly valve models are not designed to withstand extemalpressure encountered in stripping operations.
3.1.52kick: Influx of formation liquids or gas that resultsin an increase in pit volume. Without corrective measure, thiscondition can result in a blowout.
3.1.56opening ratio: The ratio of the well pressure tothe pressure required to open the BOP.
3.1.57overburden:The pressure on a formation due tothe weight of the earth material above that formation. Forpractical purposes, this pressure can be estimated at 1 psi/ft ofdepth.
3.1.58packoff or stripper: A device with an elastonerpacking element that depends on pressure below the packingto effect a seal in the annulus.This device is used primarily torun or pull pipe under low or moderate pressures. This deviceis not normally considered dependable for service under highdifferential pressures.
3.1.59pipe rams: Rams whose ends are contoured toseal around pipe to close the annular space. Unless specialrams accommodating several pipe sizes are used，separaterams are necessary for each size (outside diameter) pipe inuse.
3.1.6opit volume indicator: A device installed in thedrilling fluid tank to register the fluid level in the tank.
3.1.61pit volume totalizer: A device that combines allof the individual pit volume indicators and registers the totaldrilling fluid volume in the various tanks.
3.1.62plug valve: A valve whose mechanism consists ofa plug with a hole through it on the same axis as the directionof fuid flow.Turning the plug 90 degrees opens or closes thevalve.The valve may or may not be full-opening.
3.1.63pressure gradient,normal: The subsurfacepressure proportional to depth, which is roughly equal to thehydrostatic pressure of a column of salt water (0.465 psi/ft).3.1.64pressure regulator: A control system compo-nent which permits attenuation of control system supply pres-sure to a satisfactory pressure level to operate componentsdownstrearm.
3.1.65rated working pressure: The maximum internalpressure that equipment is designed to contain or control.Note:Rated working pressure should not be confused with test pressure.3.1.66relief well: An offset well drilled to intersect thesubsurface formation to combat a blowout.
