Technically there are certain requirements and technical specifications:
First, arrangement requires
(1) For open or semi-open layout of the pump, the pump and prime mover in general and the axis perpendicular to the axis of the pipe gallery.
(2) For the interior layout of the pump, when the temperature is higher than its transport liquid natural point or transmission fluid is a liquid hydrocarbon, the pump should be disposed with other miscellaneous separately within their respective rooms, separated by a firewall.
When the pump is disposed in the interior, it is generally not considered prevailing requirements of motor vehicle maintenance.
Spacing between the pump should not be the end or side of the pump and the wall is less than 1.2 ~ 1.5m, spacing between two rows of the pump should not be less than 2m. Power side and the side of the steam reciprocating pump pump should be left out of the piston and rod position.
Vertical pumps arranged in the bottom of the tube side porch or framework, the top of the pump should be set aside space for the installation and maintenance needed.
Various centrifugal pump maintenance inspections required space. When piping on both sides to set aside at least one side of the pump used to do maintenance.
Second, the arrangement of pump
(1) Open layout generally concentrated pump disposed in the tube side or a side porch, can also be arranged in the vicinity of the suction miscellaneous equipment, the main advantage is well ventilated, easy operation and maintenance. If the pump is disposed miscellaneous pipe porch side pump outlet center line should be aligned from the pipe centerline pillars 0.6m.
(2) Semi-open semi-open arrangement arranged pump is suitable for rain-fed areas, usually in tubes arranged side porch pump, located in the upper part of the pipe roof. Or the pump is disposed on the lower surface of the frame to frame as the platform roof. The pump arrangement requirements, the pump is arranged in a single row, double or multiple rows.
(3) Arranged in the interior layout of the interior pump suitable for cold or sandy areas, as well as process the special requirements of the occasion.

1.Due to water erosion, water pump impeller and the inner wall of the flow path through the water became rough, the friction coefficient of the pump flow path increases, and  in the pump flow rate greatly increased and the head of water loss. Hydraulic efficiency.
2.Since the drugs before dosing pump or water quality and other reasons, so that the pump housing severe fouling or corrosion. Severe fouling pump housing can increase the casing wall thickness of about 2ram, dirt and water pump wall to form tumors, so that the pump volume reduced, reducing the amount of pumping, and the flow path coarse, increase head loss. Customer product efficiency and hydraulic efficiency is reduced.
3.Casting defects caused due process pumps, cavitation, erosion, corrosion and chemical attack and other causes produce the pump flow passage holes or cracks, resulting in water flow caused by vortices of energy loss. Hydraulic efficiency.
4.The surface of the impeller cavitation. Due to the dorsal surface of the blade run negative pressure, when the pressure Pk <Pva when, after generating steam hole and cellular surfaces, in the electrochemical corrosion effect, leaves the pump cavitation.
5.The volume loss and mechanical loss. Since the pump using a long time, and resistance to mechanical wear and tear resulting leakage increases, the volumetric efficiency and mechanical efficiency.
For these reasons, the pump performance deteriorates. Operating efficiency is reduced by 2 to 5%, the efficiency of pump can be severely reduced by more than 10%.