Installation Operation and Maintenance Manual

Installation (Continued)Piping checklistsGeneral piping checklistPrecautionsCAUTION:• Never draw piping into place by using force at the flanged connections of the pump. This can imposedangerous strains on the unit and cause misalignment between the pump and driver. Pipe strainadversely affects the operation of the pump, which results in physical injury and damage to theequipment.• Vary the capacity with the regulating valve in the discharge line. Never throttle the flow from thesuction side. This action can result in decreased performance, unexpected heat generation, andequipment damage.Piping guidelinesGuidelines for piping are given in the Hydraulic Institute Standards available from the Hydraulic Instituteat 9 Sylvan Way, Parsippany, NJ 07054-3802. You must review this document before you install the pump.ChecklistCheck Explanation/comment CheckedCheck that all piping is supportedindependently of, and lined upnaturally with, the pump flange.Keep the piping as short aspossible.Check that only necessary fittingsare used.Do not connect the piping to thepump until:• The grout for the baseplate orsub-base becomes hard.• The hold-down bolts for thepump and the driver aretightened.Make sure that all the pipingjoints and fittings are airtight.If the pump handles corrosivefluids, make sure that the pipingallows you to flush out the liquidbefore you remove the pump.If the pump handles liquids atelevated temperatures, make surethat the expansion loops andjoints are properly installed.This helps to prevent:• Strain on the pump• Misalignment between the pump and the drive unit• Wear on the pump bearings and the coupling• Wear on the pump bearings, seal, and shaftingThis helps to minimize friction losses.This helps to minimize friction losses.—This prevents air from entering the piping system orleaks that occur during operation.—This helps to prevent misalignment due to linearexpansion of the piping.28 Model 3796 i-FRAME Installation, Operation, and Maintenance Manual