Installation
XHD Installation, Operation, and Maintenance Manual
35
Example: Installation for expansion
Correct
Incorrect
This illustration shows a correct installation for
expansion:
1.
Expansion loop/joint
This illustration shows an incorrect installation for
expansion:
Suction-piping checklist
Performance curve reference
Suction-piping checks
Check
Explanation/comment
Checked
Check that the distance between the
inlet flange of the pump and closest
flow disruption (elbow, valve, strainer,
or expansion joint) is at least five pipe
diameters.
This minimizes the risk of cavitation in the
suction inlet of the pump due to turbulence.
Check that elbows in general do not
have sharp bends.
See the Example sections for illustrations.
—
Check that the suction piping is one or
two sizes larger than the suction inlet of
the pump.
Install an eccentric reducer between
the pump inlet and the suction piping.
Suction pipe reducers should have no
more than two pipe diameter changes
per reducer.
The suction piping must never have a smaller
diameter than the suction inlet of the pump.
See the Example sections for illustrations.
Check that the eccentric reducer at the
suction flange of the pump has the
following properties:
• Sloping side down
• Horizontal side at the top
See the example illustrations.
Suggested suction strainers are used.
Check that they are at least three times
the area of the suction piping.
Monitor the pressure drop across the
suction strainer.
An increased pressure drop across the
strainer of 5 psi (34.5 kPa) indicates
that the strainer should be removed
and cleaned.
After a period of time (24 hours mini-
mum) system flushing should be com-
plete and the suction strainer can be
removed.
Suction strainers help to prevent debris from
entering the pump.
Mesh holes with a minimum diameter of 1/16 in.
(1.6 mm) are recommended.
Liquids with specific gravity less than 0.60 a
pressure drop across the suction strainer may be
due to ice buildup. Ice buildup can cause turbu-
lence, low pressure areas and pumpage vapor-
ization.
Summary of Contents for Goulds Pumps XHD
Page 1: ...Installation Operation and Maintenance Manual XHD ...
Page 2: ......
Page 151: ...Parts Listings and Cross Sectionals XHD Installation Operation and Maintenance Manual 149 ...
Page 153: ...Certification CE or CE ATEX XHD Installation Operation and Maintenance Manual 151 ...
Page 156: ...Certification CE or CE ATEX XHD Installation Operation and Maintenance Manual 154 ...