API STD 674-2010 pdf free download

API STD 674-2010 pdf free download.Positive Displacement Pumps— Reciprocating.
3.10 maximum allowable temperature Maximum continuous liquid temperature permitted by the Manufacturer’s design when handling the specified liquid at the specified maximum operating pressure. 3.11 maximum allowable working pressure (MAWP) Maximum continuous pressure permitted by the Manufacturer’s design when handling the specified liquid at the specified maximum operating temperature. 3.12 maximum continuous speed Highest speed at which the machine, as built and tested, is capable of continuous operation with the specified liquid at each of the specified operating conditions. NOTE cf. speed (3.40). 3.13 minimum allowable liquid temperature Lowest liquid temperature permitted by the Manufacturer’s design. 3.14 minimum allowable speed Lowest speed at which the Manufacturer’s design permits continuous operation. NOTE This is measured in revolutions per minute for power pumps and strokes per minute for direct acting pumps. 3.15 mounting plate Baseplate, skid, or soleplate on which the equipment is mounted. NOTE See 7.4 for mounting plate specifications. 3.16 net positive inlet pressure NPIP Minimum instantaneous pressure determined at the pump inlet reference point during pulsating pressure, minus the vapor pressure of the liquid at the maximum operating temperature. 3.17 net positive inlet pressure available NPIPA NPIP determined by the Vendor from the NPSHA and system data. 3.18 net positive inlet pressure required NPIPR Minimum NPIP required by the pump to achieve the required performance with the specified liquid. 3.19 NPIPR test Running test conducted to validate the NPIPR.
3.20 net positive suction head NPSH Total absolute suction pressure determined at the underside of the mounting plate, minus the vapor pressure of the liquid. NOTE It is expressed as head of water, in meters (ft). 3.21 net positive suction head available NPSHA Minimum value of NPSH determined to be available under any specified operating condition at the underside of the mounting plate, based on steady state flow. NOTE NPSHA is a value provided by the Purchaser and which the Supplier will use to calculate the NPIPA (see 3.17). NPSHA is a function only of the system upstream of the pump and the operating conditions, and is independent of pump design. 3.22 observed [test] Inspection [test] for which the Purchaser is notified of the timing, and the inspection [test] is performed as scheduled irrespective of whether the Purchaser or Purchaser’s representative is present. 3.23 panel Enclosure used to mount, display and protect gauges, switches and other instruments. 3.24 performance test Running test conducted to confirm the pump’s mechanical and volumetric efficiency. 3.25 piston pump Reciprocating pump having a seal attached to the piston and moving within a cylinder. 3.26 piston load plunger load Force acting on one piston or plunger during any portion of the pumping cycle. 3.27 plunger pump Reciprocating pump having a uniform-section plunger that moves in a static seal. 3.28 power pump Reciprocating pump consisting of a power end and a liquid end connected by a frame or distance piece. NOTE 1 The power end of a power pump transmits energy from a rotating shaft to pistons or plungers by means of a crankshaft, connecting rods, and crossheads. NOTE 2 The liquid end of a power pump consists of the cylinders, the pistons or plungers, and the valves.
3.29 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. 3.30 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. 3.31 pressure-limiting valve accumulation pressure Pressure at which a pressure-limiting valve discharges the pump rated flow.