Baseplates & Foundations & Types of Baseplate Installation

Free Standing vs Grouted Baseplates

Free Standing Baseplates
Stilt or spring mounted designs


  • Lower installation costs.
  • Minimizes strain from thermal expansion.
  • Facilitates cleaning / housekeeping.


  • Must be rigid / reinforced design.
  • Little or no vibration dampening.
     * Vibration from external sources.
     * Balance and alignment.

Grouted Baseplates


  • Greater rigidity.
  • Less susceptible to external loads.
  • Larger mass capacity.
  • Greater vibration dampening.


  • Must be grouted properly to gain benefits.

Leveling Baseplates

Baseplates must be leveled in two planes; along the length and across the width.


  • Minimize angular misalignment to pipe.
  • Assures optimum oil lubrication.
  • Accurate sight gage reading.
  • Proper oiler operation.


  • Adjustment screws on stilt mounted type.
  • Leveling screws on grouted type.
  • Wedges / Shims on grouted type.

Good Practices:

  • Leveling screws, wedges, or shims should be coated,
    sleeved, or protected to prevent adherence to grout.
  • Leveling devices should be positioned at each anchor bolt
    and at on addition mid-point on unreinforced bases.
  • Wedges and shims should be removed after grouting with
    void areas patched with grout compatible material.

Foundation & Anchor Bolts


  • Use 20/10 rule for anchor bolts:
     * 20 bolt diameters in foundation.
     * 10 bolt diameters in protection sleeve.
  • The foundation mass should be 3 to 5 times that of the pump assembly.
  • Foundation and baseplate must be properly prepared before grouting.
  • Anchor bolts should be tightened after grout has fully cured.

Grouting Baseplates


  • Grout with low shrink material.
     * Minimum 3000 psi compressive strength.
     * Epoxy grout preferred.
         - corrosion resistance
         - vibration dampening
         - 2000 psi bond strength
         - seals out oil & moisture
  • Clean & prime bottom of base for best adhesion.
  • Eliminate air traps and dams under the baseplate &
    provide vent holes in strategic locations.

Final Checks & Preparations

  • Check for grout voids / air pockets - repair as necessary.
  • Fill all vent & grout hole.
  • Seal cementitious-type grout.
  • Clean pump and motor locating surfaces.

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