UL 448:2020 free download Centrifugal Stationary Pumps for Fire- Protection Service
ANSI/ASME B16.42, Standard forDuctile Iron Pipe Flanges and Flanged Fittings
ANSI/ASME B16.5, Standard forPipe Flanges and Flanged Fittings
ANSI/ASME B1.20.1, Standard forPipe Threads, General Purpose, Inch
ANSI/ASME B36.10, Welded and Seamless Wrought Steel Pipe
Hydraulic Institute (HI) Standards
ANSI/HI 14.6-2011, American National Standard for Rotodynamic Pumps for Hydraulic Performance Acceptance Tests
International Standards Organization (ISO) Standards
ISO 21940-11, Mechanical Vibration – Rotor Balancing – Part 11: Procedures and Tolerances for Rotors with Rigid Behaviour
National Fire Protection Association (NFPA) Codes and Standards
NFPA 20, StationaryPumps forFire Protection
6 Glossary
6.1 For the purposes of this standard, the following definitions apply.
6.2 CORROSION-RESISTANT MATERIAL – A material having resistance to corrosion equivalent to or exceeding that of a brass, bronze, monel, or Series 300 stainless steel alloy. 6.3 PRESSURE, MAXIMUM NET – The maximum net pressure developed by the pump at the rated speed which typically occurs at or near shutoffpressure.
6.4 PRESSURE, MAXIMUM WORKING – For performance tests specified in this standard, the maximum pressure developed at the pump discharge flange under any condition of intended use determined by the sum of the maximum net pressure developed by the pump and the allowed positive suction pressure . For production tests, this value may be lower, based on the conditions imposed by the particular installation for which the pump is constructed. The maximum net pressure and maximum positive suction pressure that are marked on the pump are those that indicate the acceptability of a pump (the limiting pressures) for an installation.
6.5 PRESSURE, NET (TOTAL HEAD):
a) For a split-case, end-suction, in-line pump, multistage multiport, or a vertical-turbine pump in a suction vessel, the algebraic difference in psi (kPa) between pressures measured at the discharge flange and at the suction flange, corrected to the pump centerline and corrected for differences in velocity head at the points of gauge attachment.
b) For a vertical-turbine pump in a sump or well, the pressure measured by a pressure gauge attached just beyond the discharge head, corrected for the velocity head at the point of gauge attachment and for the vertical distance from the pumping water level to the center of the gauge.
6.6 PRESSURE, SHUTOFF (CHURN) – The net head developed by a pump at rated speed with no water being delivered (discharge valve closed).
6.7 PUMP, END-SUCTION – A horizontal centrifugal pump characterized by having its suction nozzle on the pump centerline at the opposite side of the casing from the stuffing box and having the face of the
UL 448:2020 free download
