Teral SJ4S, Instruction Manual

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３.４ Cautions for piping work
（1）Make the suction piping as short as possible，with as less bends as possible．
（2）Provide pipe supports for the piping，so that the weight of the piping is not
imposed on the pump.
（3）To prevent accumulation of air in the suction piping，make the piping slope gently
upwards towards the pump（at a gradient of 1/100 or more） ．
（4）The suction piping should be of the larger size as the pump inlet size.
（5）Provide a sluice valve and a check valve in the discharge piping．If there is danger of
water hammer occurring，use a shock-absorbent type check valve．
（6）If the pump is used for positive suction pressure，a sluice valve must be fitted in
the suction piping．
（7）If the pump is used for negative suction pressure，do not install a sluice valve in
the suction piping．
（8）If the pump is used for negative suction pressure，install a foot valve equipped
with a strainer on the end of the suction piping，to prevent intake of foreign
matter．
（9）Install joints of suction piping very carefully，so that no air gets inside them．
(10) Do not join the suction pipes together when pumps used for negative suction pressure.
（11）After connecting up the piping，be sure to clean the interior of the reservoir tank，
so that no foreign matter will be sucked into the pump from the tank．
The weight of the piping must not be imposed on the pump．If it is，the alignment
will become offset，resulting in damage to the equipment，vibration or noise．
Size of suction pipe 80mm・100mm・125mm should use
a size bigger. Small size pipe may cause
cavitation.
ポンプ吸込口径 吸込配管口径
８０ mm １００ mm
１００ mm １２５ mm
１２５ mm １５０ mm
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