YK10-0015-DI-002-03
17
CAUTION
●The machine is designed not to cause any leakage under restricted
condition and demonstrated by the Leak test. However, it still has a
risk of leaking under any abnormal condition other than specified, for
example abnormal water pressure rise. In such a case, the leakage
shall remain unstopped unless the supply from the system stops. You
should refrain from installing electrical equipment or wiring beneath
the pump and on the floor around the pump.
●It is recommended to install a water leakage sensor on the floor under
the pump and incorporate it in the interlock system of the device.
When a water leakage is detected, immediately close the supply valve
for the cooling water.
After closing the valve, attach a "CLOSED" tag to the handle.
●Install a flowmeter at the cooling water source for devices etc. with
which you can see it is flowing to allow you to check whether or not
the cooling water is flowing.
CAUTION
●It is recommended to use water with a low number of impurities (e.g.
industrial water; see the table below) as the cooling water for this product.
Depending on the water quality, the cooling water system of this product
may cause scale, such as calcium carbonate, inside it, reducing the
cooling water flow. In addition, it may be corroded from the inner wall by
chlorine ions, resulting in cooling water leakage. And if pure water is
used, metal may be eluted, resulting in cooling water leakage. Note in
advance that in such a case, repair may be borne by you.
●Shortage of the cooling water might give damage on the bearing, gear
and rod sealing, which results in contact of the rotor and casing and
operation stop.
[For reference] The standard quality of water supply in the Japanese industrial water works
Turbidity
Mg/L
pH Alkalinity
CaCO
3
Hardness
Mg. CaCO
3
mg/L
Evaporation
residue
mg/L
Chlorine ion
Cl-
mg/L
Iron
Fe
mg/L
Manganese
Mn
mg/L
20 or less 6.5 – 8.0 75 max. 120 max. 250 max. 80 or less 0.3 or less 0.2 or less
Established by: Japan Industrial Water Association
(Industrial water quality standard setting committee)
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