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 FIGURE 5-11
Inadequate Pipe
Insulation
Fiber glass and rigid foams must be jacketed. Section 2.5.8 has more information
on pipe insulation and jacketing materials.
Interior piping must also be insulated, but jacketing or painting is only required for
appearance, color coding, or protection from people.
Adequate insulation means at least R-4, but it is desirable to have R-7 or more.
Use materials and techniques similar to those used originally to repair piping
insulation. Do not use duct or electrical tape to hold the insulation together. This
method will fail in a few months, making the system look and perform worse than
ever.
Replace missing hangers, and tighten loose ones. Be sure galvanized hangers are
not in direct contact with copper tubing.
The galvanic corrosion resulting from direct contact will "eat" the solder out of the
joints. Provide adequate cradles for the pipe insulation to keep it from being
crushed.
REPAIR
5.2 REPAIR PROCEDURES
155
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