DG boiler feed water pump installation

DG boiler feed water pump installation
DG boiler feed water pump in general is mainly used for boiler feed water, moisturizing, so also known as the boiler water pump.
The high pressure boiler feed water pump can design four directions of import and export, import and export respectively in the water and the water pump, all vertical choose pump head can be used according to pressure to increase or decrease the pump series.
Water pump motor, water pump, main points of three parts, chassis, motor and pump adopt the claw elastic shaft coupling, pump by the pump shaft, shaft sleeve, water period, middle, impeller and guide blade, segment, sealing ring, water balance, balance disc, late and other major parts.Water period, middle and tail section and pump water pump body and studio, pump body and impeller are made from cast iron.

DG boiler feed pump is multi-stage segmental type, the boiler feed water pump assembly is good or not, a great influence on performance, especially the export and import the relative position of the guide vane impeller, the impeller per level of vomit export hub must be aimed at the center of the island’s wing, with a slight deviation will reduce the flow of water pump, the head is reduced, efficiency is poor, so it is important to note that at assembly after repair if there is deviation must be adjusted.
DG boiler feed pump of the main parts are shaft, shaft sleeve, a water inlet, impeller and guide vane, sealing ring, interrupt, section water, the balancing ring, disc, tail cover.Inlet, outlet section and the tail section, interrupt cover are made from cast iron, together form the pump studio.
Impeller is made from cast iron, with blade, the axial unilateral into liquid, high pressure boiler feed water pump due to compression, before and after impeller must exist axial force, the axial force by balance disc, the impeller was manufactured by the static balance test, from the rotation direction, pump shaft to rotate clockwise.
DG boiler feed pump water pump bearing is a single-row radial ball bearing, using calcium base butter lubrication.

DG155-67 * 7 models
155 cubic meters /
Single stage 67 meters head * 7, 67
2950 RPM
The efficiency of 74%
2667.7 KW shaft power
Power of 315 kw motor

DG boiler feed water pump installation common sense rules
Water pump line is part of the whole pumping system.Even if the pump installation is correct, but if the pipe installation is not correct, will also affect the normal work of the pump.When the inlet and outlet piping installation, the following problems should be paid attention to.
(1) in order to ensure uniform into the pump inlet flow rate, not affect the efficiency of water pump, close to the pump inlet cannot directly to bend, to install a length of 3 times for pipe diameter of straight pipe bend pipe after installation.
(2) when the suction culvert diameter greater than the pump diameter, installed in the pump inlet need a flat under the oblique eccentric joints.Installing a eccentric joints, must make the inferior oblique, if put eccentric joints, tilting the above, is easy to save gas.
(3) there will not be to save gas inlet pipe, otherwise, before the start of irrigation pipe when the air is endless, will affect the normal water pump.As a result, any part of the inlet pipe cannot be higher than the pump inlet;The inlet pipe should be level or slightly downward sloping, don’t be tilted upward.
(4) the inlet pipe can’t there is gas leakage, because hand-raised by water pump suction tube of vacuum degree, such as leakage, pressure pipe will not be able to keep certain vacuum degree, the pump is pumping water to hard.So when installing suction culvert, paying special attention to the flange connection: flange plane should level off, clean, cushion layer between 3 ~ 5 mm thick rubber washer or asbestos gaskets, gasket inside the mouth of not less than the inside of the pipe mouth;Two sections of pipe in mouth to alignment, lest affect the flow of water, increase water resistance;Flange bolts should be symmetrically tight and tightness.
(5) the bottom valve should be vertical suspended in water, or the distance around the walls, bottom valve and water should not be less than the outer diameter size of bottom valve or bell mouth;Bottom valve submerged under the surface of the water depth, from valve surface should be at least 1.5 ~ 2.0 times of bottom valve diameter.
(6) inlet pipe and its accessories should be supported and firm, don’t make the water pump bearing.
(7) high lift pump, must be installed on the outlet pipe gate valve and check valve.Check valve should be close to the pump outlet, the gate just in the back of the check valve.When stop first close gate, so we can reduce the vibration of the pump.
(8) the water outlet pipe should be immersed in a pool of water, the submerged depth of about 1 ~ 2 times the diameter of the nozzle, ensure the pump outlet pipe mouth while working in the water, and water pump stop working when the outlet pipe mouth above the water.If the outlet flooding is deep, the downtime after debris flow into the pump;Outlet pipe mouth also shoulds not be too high, too high, the water head, under the condition of constant power of engine, the pump flow will be reduced.
(9) outlet pipe should be supported and firm, lest cause damage to the pipe pressure on the pump.
(10) pipe connection place can’t slack, especially high lift pump more attention should be paid to.