By Igor J. Karassik, Joseph P. Messina, Paul Cooper, Charles C. Heald
An important revision of McGraw-Hill's vintage instruction manual that gives sensible info and information at the layout, program, specification, buy, operation, troublshooting, and upkeep of pumps of each kind. it's an important operating device for engineers in a large choice of industries all those people who are pump experts, as well as those that have to acquaint themselves with pump expertise. Contributed to by way of over seventy five special execs and experts in each quarter of useful pump expertise.
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Additional info for Pump Handbook (3rd Edition)
PI ϭ power delivered to all fluid flowing through the impeller, ft-lbf/sec (kW). PS ϭ shaft power, ft-lbf/sec (kW). ϭ perimeter of flow passage cross section normal to the flow direction, ft (m). Q ϭ volume flow rate or, more conveniently, “flow rate” or “capacity,” ft3/sec (m3/s). QDR ϭ flow rate below which discharge recirculation exists, ft3/sec (m3/s). QL ϭ leakage from impeller exit to inlet, ft3/sec (m3/s). Qmin or MCSF ϭ minimum continuous stable flow rate, ft3/sec (m3/s). QR ϭ flow rate below which recirculation exists, ft3/sec (m3/s).
This is twice the impeller OD tip speed head U22/2g. The right-most velocity diagram in Figure 6a has zero Vu,2; however, the maximum or “runout” flow rate happens at lower Q than this. That is because the actual head H is less than ⌬Hi due to losses (as seen in Eq. 10), and ⌬H ϭ 0 at runout—where overall pump efficiency (Eq. 8) is also zero. p. ” However, it fails at “low Q,” where recirculating flow develops—indicated by a substantial one-dimensional deceleration or reduction in the fluid velocity relative to those passages—that is, W2 V W1.
Outer limit of region or gap (Tables 4 and 5). ϭ pump outlet flange or port. ϭ pressure side of blade or passage. ϭ value of r at the impeller ring clearance. ϭ shaft. ϭ suction flange or inlet of the pump. ϭ shockless entry (that is, inlet velocity vector aligned with blade camber line). ϭ shut-off or zero flow rate Q. ϭ in the radial direction. ϭ the 50% or mean meridional streamline. ϭ shaft. ϭ suction side of blade or passage. ϭ same meaning as sh and t. ϭ shroud (also at the eye plane at inlet—and in general “t” at outlet).
Pump Handbook (3rd Edition) by Igor J. Karassik, Joseph P. Messina, Paul Cooper, Charles C. Heald