Flange loads from the piping system, including those from the thermal expansion of
the piping, must not exceed the limits of the pump. Casing deformation can result in contact
with rotating parts, which can result in excess heat generation, sparks, and premature failure.
NOTICE:
Vary the capacity with the regulating valve in the discharge line. Never throttle the flow from the
suction side. This action can result in decreased performance, unexpected heat generation,
and equipment damage.
Piping guidelines
Guidelines for piping are given in the
Hydraulic Institute Standards
, available from: Hydraulic Institute, 9
Sylvan Way, Parsippany, NJ 07054 and in API RP 686, and must be reviewed prior to pump installation.
Alignment criteria for pump flanges
Type
Criteria
Axial
The flange gasket thickness ±0.8 mm | 0.03 in.
Parallel
Align the flange to be within 0.001 mm per mm | in. per in. of the flange diameter to 0.8mm | 0.03 in.
max.
Concentric You can easily install the flange bolts by hand.
The above criteria are based on the following references from API RP 686, 2nd Edition:
4.6.3 The machine and piping flange faces shall be parallel to less than 10 micrometers per centimeter |
0.001 in. per in. of pipe flange outer diameter up to a maximum of 750 micrometers | 0.030 in. For piping
flange outer diameters smaller than 25 cm | 10 in., the flanges shall be parallel to 250 micrometers |
0.010 in. or less. For special- purpose machinery, pipe to machinery flange spacing measurements shall
be recorded on the Piping alignment datasheet shown in Figure B.4. For raised face flanges, feeler
gauge readings shall be taken at the raised face. For flat faced flanges, feeler gauge readings shall be
taken at the flange outside diameter.
4.6.4 Flange face separation shall be within the gasket spacing ±1.5 mm | 1/16 in. Only one gasket per
flanged connection shall be used.
4.6 Piping checklists
Model 3700, 3703, 3710, 3700LF, 3700LFI API Type OH2 / ISO 13709 1st and 2nd Ed. / API 610 8/9/10/11th Ed. Instal-
lation, Operation, and Maintenance Manual
31
Summary of Contents for Goulds Pumps 3700
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