Check
Explanation/comment
Checked
It is recommended that a commissioning
(temporary) suction strainer be used.
After commissioning it is recommended an
operating (permanent) suction strainer be
used.
Check that the strainer has at least three
times the area of the suction piping.
Check the location of the suction strainer is
at least 5 pipe diameters from the suction
nozzle.
Continuously monitor the pressure drop
across the suction strainer.
Limit the pressure drop across the strainer
to 68.9 kPa | 10 psi, or the vapor pressure
of the pumped fluid, or the resulting NPSHr
is not adequate.
After a period of time (24 hours minimum)
system flushing should be complete and
the commissioning (temporary) suction
strainer can be removed.
Suction strainers help to prevent debris from entering
the pump
Recommended commissioning (temporary) strainer
mesh size:
•
Viscosity≤100cP use 60 mesh
•
Viscosity>100cP use 40 mesh
•
Viscosity>300cP use 20 mesh
Recommended operating (permanent) strainer mesh
size:
•
Viscosity≤100cP use 40 mesh
•
Viscosity>100cP use 20 mesh
•
Viscosity>300cP use 12 mesh
If more than one pump operates from the
same liquid source, check that separate
suction-piping lines are used for each
pump.
This recommendation helps you to achieve a higher
pump performance and prevent vapor locking espe-
cially with specific gravity of liquid less than 0.60.
If necessary, make sure that the suction
piping includes a drain valve and that it is
correctly installed.
—
Assure adequate insulation is applied for
liquids with specific gravity less than 0.60.
To assure sufficient NPSHa.
Liquid source below the pump
Check
Explanation/comment
Checked
Make sure that the suction piping is free
from air pockets.
This helps to prevent the occurrence of air and cavita-
tion in the pump inlet.
Check that the suction piping slopes up-
wards from the liquid source to the pump
inlet.
—
Check that all joints are air-tight.
—
If the pump is not self-priming, check that a
device for priming the pump is installed.
Use a foot valve with a diameter that is at least equiva-
lent to the diameter of the suction piping.
4.6 Piping checklists
34
3620 i-FRAME API type BB2 single stage / ISO 13709 2nd Ed/API 11th Ed Installation, Operation, and Maintenance
Manual
Содержание GOULDS PUMPS i-FRAME 3620
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