YAMADA NDP-5FAT Operation Manual

Also see for NDP-15 series: Operation manual Maintenance manual

YAMADA NDP-5FAT Operation Manual Manual pdf 15 page image

134. Connection4.1 Connecting fluid piping1) Connect a flow valve and a drain valve to the fluid discharge port of the pump.2) Connect a valve for maintenance to the fluid suction intake port of the pump.3) Connect a hose to the valve on the suction-port side and the valve of the discharge-port side of thepump.4) Connect a hose on the suction-side intake and the discharge-port side to the respective vessels.CAUTION• Use a flexible hose to absorb pump vibration, and ground the hose.• Make sure that there will be no external force on any connection part of the pump. Beespecially careful not to have the pump support part of the weight of the hose and the piping.• Use a sturdy hose that will not collapse under the strong suction of the pump. Also, makesure the hose is of more than sufficient pressure rating.• Use a hose of a diameter the same as or larger than the pump's ports. If you use a hose ofsmaller diameter, the pump's performance will be adversely affected, and it may evenmalfunction.• When pumping a fluid that contains slurry, verify that the particle size is below the slurrylimitation (see “10.1 Main specifications”). If it exceeds the limitation of slurries indicated inthe main specifications, attach a strainer to the pump to stop larger particles. Otherwise,such particles may cause a malfunction.• If, depending upon the place of pump installation, thevolume of the pumped fluid changes drastically, install arelief valve on the discharge side, and bring the pressuredown below the maximum permissible value. If, owing toa change in the volume of fluid, the pressure inside thepump exceeds the maximum permissible pressure, itmay cause damage.• Keep a vessel below the relief valve to catch anydrain off.• When testing piping for leakage, do NOT apply pressure to the pump's inlet and outlet sideswith compressed air from outside. It may cause abnormal breakage to the diaphragm or theswitching portion. When testing the piping, either install a valve between the pump's suctioninlet and the discharge outlet and piping, or disconnect the pump from the piping and installplugs so that there will be no pressure from outside.• In our product inspection, clean water is used. To prevent mixture of dirty water into thefluid to be pumped, clean the inside of the pump before finishing installation work.• When installing a standby pump or two pumps in parallel from, be sure to provide a valve oneach of the IN and OUT sides and perform pump switching by using the liquid materialvalve. If the valve of the stop-side pump is open, the diaphragm will be inverted by thedischarge pressure of the operating-side pump, resulting in damage in an early stage.Fig.4.2Fig.4.1