Foundation of pedestal

The pump and driver are attached to a base plate that is bolted to a foundation. The grout is placed between the base plate and the foundation to lessen vibration problems.

There are a few things you should know about foundations:

  • The mass of the foundation should be at least five times the mass of the hardware sitting on it.
  • A foundation poured with conventional concrete needs a full month to cure. There is some quick setting concrete on the market, but approach it with caution.
  • The only way to fix a bad foundation is to pour a new one. Sometimes there is room behind the old foundation and you can continue to use the old one while you wait a month for the new one to settle. Moving from the old foundation should then only involve the use of a spool piece on the piping and you might get lucky and remove an elbow that was too close to the pump suction.
  • Tack welding the foundation bolts to the re-bar will add strength to the foundation system.
  • Do not try to get one set of bolts to do both the jobs of anchoring and leveling by bolting the base plate down with a leveling nut underneath. This puts the anchor bolts under compression, and they should be in tension to prevent forcing the bolt into the concrete where it can crack it.
  • Up to 500 horsepower (375 KW), the foundation must be 3 inches (76 mm.) wider than the base plate all around. Above 500 horsepower (375 KW) the foundation should be a minimum of 6 inches (150 mm.) wider.



  • On February 15, 2018