39
2.3.3 Cooling Water Piping
: Before start work, ensure that all hazardous energies are shut
off. Refer to 2.1 For Safety Use.
- If two or more pumps are used, connect them in parallel, if
connected serial, then the cooling performance will be reduced
and resulted a failure.
- Do not mistake the cooling water inlet and outlet.
- If cooling water contains much scale or impurities, filter it with a filter in the fore
stage.
- It is difficult to accomplish an adequate flow rate when water supply source is far
distant from drain outlet, or piping level is uneven (the drain outlet level is higher
than that of the pump).
In this case, improve the piping arrangement, or use larger sized pipe, or increase
the water pressure within specified pressure scope.
- Only stainless steel pipe is used for cooling water piping of the dry pumps. Please
note that troubles because of following causes shall be paid service, due to choked
pipe and drop of cooling efficiency by deposition and accumulation of impurities
(water stain, microorganism, metal powder and metal ion).
- Do not use any metal pipe other than stainless steel pipe in the cooling water
system (including host side). Ions could be merged into water, if metal pipe such
as copper and zinc are included is used. Cooling water flow rate could be decreased
because merged ion accumulates and adheres to the inner wall of the pipe.
- It is recommended to use water which does not include any impurities (e.g.
industrial water. See table below). Keep in mind not to use poor quality of water
because metal ion could be included in cooling water even inlet side of cooling water
is clean. Water stain such as calcium carbonate could be accumulated in cooling
water system depending on water quality and it could made cooling efficiency low.
In addition, there could be cooling water leakage because of corrosion from the
inner wall of water pipe by chlorine ion.
- The pump could be damaged if it continuously runs with cooling water flow rate
lower than specified amount. Make sure to keep specified flow rate.
［Reference］Standard Water Quality of Industrial Water
Established by: Japan Industrial Water Association
■- Connector Requirement : Connector port Rc3/8 female
■- Compatible piping : Joint and pipe should have water pressure resistance of
more than 0.9Mpa, and heat resistance of more than 100℃.
Cooling
water
Supply pressure (MPa) 0.1 to 0.3
Inlet-outlet pressure difference (MPa) 0.1
Flow rate (L/min) 5.0
Supply temperature 10 to 30 1)
1) Not condensing
WARNING
CAUTION
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