Water Lifts and Pumps : An Overview Pump House
A circular pump house could be conveniently located on top of the jack well. A rectangular or square shape of the pump house is more convenient and economical than a circular shape. A rectangular pump house gives more space for locating the pumping sets and ancillary equipment. A rectangular or square pump house can be constructed over the circular steining- by providing girders over the top of the steining and cantilevering them suitably. In case of a sump well, however, much space is not required in the pump house, as the motors are not located at the same level. In such cases, it is more convenient to continue the steining masonry with the circular shape. A lightening conductor should be provided on top of the pump house.
Pump House for Centrifugal Pumps
The pump house for centrifugal pumps shall be rectangular in shape. The pumps, motors, panel box for electrical components, starters and other accessories are located in the pump house separately. The wall of the pump house is about 45 cm thick and the exposed surface is plastered with cement mortor. The dimensions of the pump house, namely length, breadth and height are based on the specific requirements of the installation. The length of the pump house is the total length along the shaft of horizontal centrifugal pumps, the spacing between pumps, the spacing between the pump house walls, the outer ends of the first and the last units. The shaft length of the pumping set (pump with motor coupled to it) it obtained from the specifications of the pumping unit proposed/ The spacing between each pumping unit depends on the h.p. of the units and ranges from 60 cm to lm. For pumps up to 30 h.p.: 60cm, 31 to 60 h.p.: 70cm, 61-90 h.p. : 80cm. 91-120 h.p. : 90 cm and above 120 h.p. : 1 m. The same values may be adopted for the clearance between the wall and the first and the last pump in the row.
The width of the pump house is computed on the basis of the requirements of the following: •
- (i) The width of the pump, including the length between the suction side flange and the delivery side flange of the pump,
- (ii) The clearance between the wall and the suction flange of the pump is kept 60 cm in all cases. This includes 15cm as the clearance from the wall to the eccentric taper flange and 45 cm as the length of the eccentric taper. When the length of the eccentric taper exceeds 45 cm, the width of the pump house has to be correspondingly increased,
- (iii) The length of the non-return valve on the delivery side,
- (iv) The length of the sluice valve on the delivery side.
(v) The clearance between the sluice valve flange and the pump house wall is 30 cm for pumps up to 50 h.p., 45cm for those from 50 to 100 h.p., and 60 cm for units above 100 h.p.
The height of the pump house is fixed, taking into account the following factors:
- (i) The height of the foundation block of the pumping set above the floor of the pump house is usually kept at 10 cm.
- (ii) The thickness of the base plate of the pumping unit is usually kept at about 15 cm.
- (iii) The height of the pumping set above the base plate is obtained from the specifications of the pump proposed.
- (iv) Clearance required between the top of the pumping unit and the bottom of the gantry hook.
- (v) The depth of the I-bean supporting the gantry.
- (vi) The depth of the gantry unit: This is the distance between the bottom of the gantry girder and the centre of the hook.