Grouting; Air Piping - Ingersoll-Rand CENTAC Instruction Manual

Grouting

Grouting is the most common method for permanent installation of rotating machinery. Fill
the area between baseplate and foundation with a minimum of 1" of grout to create a
uniform bearing surface. Common grouting materials are non-shrinking concrete and epoxy
type grouts.
Grout is installed in the space below the baseplate beams after preparation of the foundation
surface by chipping. After the grout has set, any wedges or shims used to level the unit must
be removed and the remaining spaces filled with grout.

Air Piping

A well-designed air piping configuration requires proper planning and execution. This
section covers the following topics:
• Inlet air piping and filters
•
Bypass air piping
•
Expansion joints
•
Discharge air piping
• Discharge air piping for multi-compressor installation
•
Receivers
•
Control air piping / filtration
•
Instrument air piping
Centac products have no design provision for accepting the full weight of external piping
connections. The discharge, inlet, bypass, water, and other piping connected to the
machine must be self-supporting. Adequate piping supports are necessary to prevent
excessive dead loads on the flanges of rotating machinery.
Piping alignment to the compressor mating flanges is essential. The piping must be
installed and supported to avoid strains on the casing. Misalignment, which is a frequent
cause of vibration, can often be traced directly to piping strains. Three sources of piping
strains are:
•
Dead weight of the piping itself
•
Expansion or contraction of the piping as it undergoes temperature change
•
Pressure within the piping
In the practical sense, if any pipe needs to be levered or pried into position to match up the
flange face with the compressor, there will be excessive pipe strain. A properly matched up
pipe flange will have just enough space to slip in a gasket, will allow all flange fasteners
(bolts, studs, etc.) to pass through the flange bolt bores without adjustment of the mating
flanges, and does not twist in any plane when the fasteners are tightened.
All piping connected to the Centac compressor should have provisions for compressor
maintenance. This usually means that there are flanged sections or unions in the
connecting pipe. A sufficient number of removable sections of pipe should be provided to
allow ease of maintenance and repair. Failure to make provisions for repair will result in
difficulty during disassembly.
SECTION 1 – PLANNING & INSTALLATION
 2000 Ingersoll-Rand Company
Date of Issue: 12 September, 2000
Centac Instruction Manual