Leveling of The Vertical Turbine Pumps (VTP pumps) mounted on the discharge head flange

Some wet pit pumps are installed directly by using the flange that comes as an integral part of the

discharge head. The Vertical Turbine Pump is lowered into the pit and aligned with the anchor bolts [372].

The mounting flange is shimmed to achieve required level by using a precision machinist’s level. The Vertical Turbine Pump is to be leveled to within 0.025 mm/0.31 m (0.001 in./ft). The data to be recorded for future reference. Anchor bolt nuts [373] are tightened sufficient enough to hold down the pump in place.

Grout is poured and allowed to set for at least 72~80 hours (cure as required) before any further work is done on the Vertical Turbine Pump.

If leveling nuts are used to level the base, they must be backed off as far as possible prior to grouting.

Always shim near foundation bolts and then back off the leveling nuts. Now tighten the foundation bolts. If done otherwise there is a risk of significantly lowering the structural natural frequency that could result in separation of the base from the grout.

Directly mounted pumps are not user friendly for service. Re-installation of these pumps requires re-leveling and re-grouting.