Figure 6-32. - Typical installation of a centrifugal pump.

checked again for parallel and angular alignment. You are now ready to connect the piping.

Piping

When installing the pump piping, be sure to observe the following precautions:

Piping should always be run to the pump.

Do not move the pump to the pipe. This could make final alignment impossible.

Both the suction and discharge piping should be independently supported near the pump and properly aligned, so the strain is not transmitted to the pump when the flange bolts are tightened.

Use pipe hangers or other supports at necessary intervals to provide support. When expansion joints are used in the piping system, they must be installed beyond the piping supports closest to the pump.

Tie bolts should be used with expansion joints to prevent pipe strain. Do not install expansion joints next to the pump or in any way that would cause a strain on the pump, resulting from system pressure changes.

It is usually advisable to increase the size of both the suction and the discharge pipes at the pump connections to decrease the loss of head from friction.

Install piping as straight as possible, avoiding unnecessary bends. Where necessary, use 45- degree or long sweep 90-degree fittings to decrease friction losses.

Make sure that all piping joints are airtight.

Where flange joints are used, you must ensure that their inside diameters match properly.

Remove burrs and sharp edges when marking up joints.

Do not "spring" piping when marking connections.

Provide for pipe expansion when hot fluids are to be pumped.

SUCTION PIPING. - When installing the suction piping, observe the precautions shown in figure 6-33. The sizing and installation of the suction

Figure 6-33. - Suction pipe installations.