Piping
65 Liebert
®
SRC™ User Manual
5.4.1 Minimum Requirements for Wall Thickness
of Ethylene Propylene Diene Methylene (EPDM) Pipe Insulation
1. Typical location (air-conditioned): When the piping passes through and indoor area where the indoor
unit operates.
• Apartment, classroom, office, mall, hospital, etc.
2. Special location (air-conditioned):
a. When the location is air-conditioned, but there is severe temperature/humidity difference due to
high ceilings.
• Church, auditorium, theater, lobby, etc.
b. When the location is air-conditioned, but internal temperature/humidity are high.
• Bathroom, swimming pool, locker room, etc.
3. Typical location (non air-conditioned): When the piping passes through an indoor area where the
indoor unit does not operate.
• Hallway, dormitory, school, etc.
4. Special location (non air-conditioned): If the following conditions are present:
a. When the piping passes through an indoor area where the indoor unit does not operate.
b. When the humidity is high and there is no air flow in the location where the piping is installed.
• The thickness of the above insulation material is based on heat conductivity of 0.61
Btu/in/h/ft
2
/°F.
NOTE
Follow local codes when selecting EPDM insulation wall thickness.
Table 5-16 Insulation guidelines for typical and special circumstances
Classification
Air-conditioned location Non-air-conditioned location
1. Typical
location
2. Special
location
3. Typical
location
4. Special
location
Liquid pipe
1/4 in.
1/2 in. 1/2 in. 1/2 in. 1/2 in.
3/8 in.
>1/2 in. 1/2 in. 1/2 in. 1/2 in. 1/2 in.
Vapor
3/8 in.
1/2 in.
3/4 in. 3/4 in.
1 in.
1/2 in.
5/8 in.
3/4 in.
7/8 in.
1 in.
1-1/8 in.
3/4 in.
1-1/4
1 in. 1 in.
1-3/8 in.
1-1/2 in.
1-3/4 in.
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