Checklist
Check
Explanation/comment
Checked
Check that all piping is supported in-
dependently of, and lined up naturally
with, the pump flange.
See Alignment criteria for pump
flanges.
•
Strain on the pump
•
Misalignment between the pump and the drive unit
Keep the piping as short as possible. This helps to minimize friction losses.
Check that only necessary fittings are
used.
This helps to minimize friction losses.
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.
—
This helps to prevent misalignment due to thermal expansion
of the piping.
Make sure that all piping compo-
nents, valves and fittings, and pump
branches are clean prior to assembly.
—
Make sure that the isolation and
check valves are installed in the dis-
charge line.
Locate the check valve between the isolation valve and the
pump. This will permit inspection of the check valve. The iso-
lation valve is required for regulation of flow, and for inspection
and maintenance of the pump. The check valve prevents
pump or seal damage due to reverse flow through the pump
when the driver is turned off.
Use cushioning devices.
This protects the pump from surges and water hammer if
quick-closing valves are installed in the system.
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
32
3640 i-FRAME API Type BB2 2-Stage / ISO 13709 2nd Ed. API 11th Ed. Installation, Operation, and Maintenance Man-
ual
Содержание Goulds Pumps i-FRAME 3640
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