Page 34 - GarlockFluidSealing2010

B-2
Introduction
An expansion joint is a specially engineered prod-
uct inserted in a rigid piping system to achieve one or
more of the following:
■ Absorb movement
■ Relieve system strain due to thermal change, load
stress, pumping surges, wear or settling
■ Reduce mechanical noise
■ Compensate for misalignment
■ Eliminate electrolysis between dissimilar metals
At Garlock, the range of our engineering empha-
sis extends from the selection of the fabric used for
reinforcement to the choice of materials used in actual
expansion joint construction.
Rigid laboratory and feld tests of Garlock
expansion joints are what back up our assurances of
long life and reliable service. An important word on
safety: all Garlock expansion joints carry safety ratings
exceeding product specifcations in such areas as
temperature and pressure.
Garlock nonmetallic expansion joints and fexible
couplings are ideally suited for hundreds of applications
in a wide range of industries, including:
■ Power generating stations
■ Pulp and paper
■ Chemical and industrial process piping
■ Waste water and sewage disposal
■ Marine applications
■ Heating, ventilating and air conditioning
Joint Selection
204, 207, 214,
200 200HP 204HP 206 208 215 306 7706-S 8100 9394 8400
Standard Piping— ★ ★ ★ ★
High Pressure
Standard Piping— ★ ★ ★
Low Pressure
Chemical Piping ★ ★ ★ ★
Standard Ducts ★ ★
Nuclear ★ ★ ★
Naval and ★ ★ ★ ★
Coast Guard
Garlock Recommendations
To select the proper expansion joint, consider:
■ Pipe size
■ Pumped medium: type of liquid, gas, or vapor in sys-
tem
■ Temperature range
■ Pressure/vacuum range
■ Movements needed
■ Environment: degree of exposure to:
• Weathering • Oil
• Sunlight • Open fame
• Liquids • Chemicals
• Gases • Other
• Vapors
■ Installed face-to-face dimensions
■ Degree of pipe misalignment
• If greater than 0.125" (3.2 mm), correct or use
a special joint
■ Drilling: if other than standard 125 Ib. ANSI,
determine:
• Flange O.D.
• Bolt circle
• Number of bolt holes
• Diameter of hole
■ Need for retaining rings
■ Need for control units
• Recommended for use with most expansion
joints
• Must be used in cases of insuffcient pipe support
■ Need for special construction