PB3 User Instruction
Page 19 of 39
3.4.4 Check coupling alignment
The angular and offset coupling alignment must be rechecked.
a)
Coupling faces are to be parallel within 0.0254 mm (0.001 in.) TIR.
b)
Coupling outside diameters is to be aligned within 0.0762 mm (0.003 in.) TIR.
c)
Motor-Driven: “Bump” the motor and check motor rotation.
d)
Turbine-Driven: Check turbine rotation. (If wrong, consult turbine manufacturer.)
3.4.5 Assemble coupling
a)
Assemble coupling per the manufacturer's instructions.
b)
Install coupling guard.
3.4.6 Dowel pump and driver
a)
Cold Pumps (temperature below 93 °C (200 °F)) Pump hold down bolts are to be torqued to the proper
value and dowel pins put in two diagonally opposite feet.
b)
Hot Pumps
Pumps handling liquids at temperatures of 94 °C (200 °F) and over are designed to permit the casing to expand
with temperature away from coupling end of pump. The units that come under this classification must have the
pump support feet dowelled to the pedestal at the coupling end. This maintains the coupling gap at the desired
amount.
The pump feet at the opposite end are held from moving vertically by the use of a self-locking nut. The
clearance between the base of the nut and the top of the pump foot should be 0.05. A “Gib Block” running
parallel to the length of the pump foot at each of the outboard feet controls the horizontal movement. The "Gib
Blocks" are bolted and doweled to the pedestal. A 0.254 mm (0.010 in.) gap is maintained between the "Gib
Block" and pump foot.
WARNING
The self-locking nuts, which hold the pump from moving in a vertical motion,
are clamped tight to the pump foot at time of shipment. The 0.051 mm (0.002
in.) clearance must be established at time of installation.
Gib block installation sketch for hot pump
c)
Pump Driver
Refer to General Arrangement Drawing and/or driver instructions for doweling information.
