Goulds Pumps 3393 - IOM - Manual (Page 32)

Installation
NOTICE:
• The pump must be protected from debris and weld slag that may accumulate in the piping
during construction. A start up strainer of 80 mesh should be installed upstream of the
pump suction and the system should be flushed for a minimum of 24 hours to be sure the
piping is clear of foreign material. It is important that the pressure differential across the
strainer be monitored and not exceed 5 psi (0.34 bar). When system flushing is complete
the start up strainer can be removed.
• The pump must be protected from debris that may accumulate in the piping over time.
Install a strainer / filter of 40 - 60 mesh upstream of the pump suction. It is important that
the pressure differential across the strainer / filter be monitored and not exceed 5 psi (0.34
bar).
Piping guidelines
Guidelines for piping are given in the Hydraulic Institute Standards available from the Hydraulic
Institute at 9 Sylvan Way, Parsippany, NJ 07054-3802. You must review this document before
you install the pump.
Checklist
Check Explanation/comment Checked
Check that all piping is supported This helps to prevent:
independently of, and lined up
• Strain on the pump
naturally with, the pump flange. • Misalignment between the pump and the drive unit
See Alignment criteria for pump • Wear on the pump bearings, seal, and shafting
flanges.
Check that only necessary fittings This helps to minimize friction losses.
are used.
Do not connect the piping to the
—
pump until:
• The grout for the baseplate or
sub-base becomes hard.
• The hold-down bolts for the
pump are tightened.
Make sure that all the piping joints This prevents air from entering the piping system or
and fittings are airtight.
leaks that occur during operation.
If the pump handles corrosive The 3393 interstage casings cannot be completely
fluids, make sure that the piping drained. Use caution in disassembly.
allows you to flush out the liquid
before you remove the pump.
If the pump handles liquids at
This helps to prevent misalignment due to thermal
elevated temperatures, make expansion of the piping.
sure that the expansion loops and
joints are properly installed.
Alignment criteria for pump flanges
Type Criteria
Axial Flange face separation should be the gasket thick-
ness ±0.06 in. (1.5mm).
Parallel For flanges with an outside diameter 10 in. (250mm)
or less align the flanges to be parallel within 0.010
in. (0.25mm).
Larger flanges should be parallel to 0.001 in./in.
(0.001 mm/mm) up to a maximum allowable mis-
alignment of 0.030 in. (0.75mm).
Concentric You can easily install the flange bolts by hand.
30 Model 3393 Installation, Operation, and Maintenance Manual