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API STD 674:2010 pdf download

API STD 674:2010 pdf download.Positive Displacement Pumps Reciprocating.
preliminary anticipated system acceleration head
The estimated pressure change due to changes in velocity in the piping system.
NOTE This is an important factor in the application of reciprocating pumps because of the pulsating nature of the flow in the pump suction line. For additional information on acceleration head, refer to Hydraulic Institute standards. For additional information on acceleration head, see Annex E.
pressure-containing part
Part that acts as a barrier between process or motive fluid and the atmosphere
EXAMPLE Liquid cylinder, discharge manifold, suction manifold, the stuffing box, cylinder plugs and covers (when in contact with process fluid), valve seats (when a portion is in contact with the atmosphere), the power cylinder, the gas cylinder head, the valve chest, and the valve chest cover and heads.
pressure-limiting valve accumulation pressure
Pressure at which a pressure-limiting valve discharges the pump rated flow.
pressure-limiting valve set pressure
Pressure at which a pressure-limit!ng valve starts to release pressure.
pressure-retaining part
Part whose failure would allow process or motive fluid to escape to the atmosphere.
EXAMPLE Liquid and gas cylinder bolting, stuffing box bolting, gland bolting, glands, and covers that constrain plugs and valve stops, but not parts such as packing, gaskets, pistons, plungers, piston rings, rods, valves, seats (when completely surrounded by pressure-containing parts), and internal bolting.
pump efficiency
pump mechanical efficiency
Ratio of the pump’s hydraulic power to its power input.
Issuer of the order and specification to the Vendor.
NOTE The Purchaser can be the Owner of the plant in which the equipment is to be installed or the Owner’s appointed agent.
rated flow
Total volume of liquid actually delivered per unit time at rated operating conditions normalized to inlet conditions.
NOTE Rated flow includes liquid and any dissolved or entrained gasses or solids specified.

When located away from the equipment or console, typically in a control room.
shutdown set point
Preset value of a measured parameter at which automatic or manual shutdown of the system or equipment is required.
special tool
Tool that is not a commercially available, e.g. from a catalogue.
speed Number of revolutions of the crankshaft in a given unit of time.
NOTE It is expressed as revolutions per minute.

Number of strokes of the piston in a given unit of time.
NOTE It is expressed in strokes per minute.
unit responsibility
Responsibility for coordinating the documentation, delivery, and technical aspects of the equipment and all auxiliary systems included in the scope of the order.
NOTE The technical aspects to be considered indude, but are not limited to, such factors as the power requirements, speed, rotation, general arrangement, couplings, dynamics, noise, lubrication, sealing system, material test reports, instrumentation, piping, conformance to specifications and testing of components.
Manufacturer or Manufacturer’s agent that supplies the equipment and is normally responsible for service support.
volumetric efficiency
Ratio of the pump rated flow to the total piston or plunger displacements per unit time.
NOTE Volumetric efficiency is normally expressed as a percentage.
witnessed [test]
Inspection [test] for which the Purchaser is notified of the timing of the inspection Etesti and a hold is piacea on the inspection [test] until the Purchaser or his representative is in attendance.
4 General
4.1 Units of Measurement.


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