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LAYOUT BEST PRACTICES
General Information / Guidelines
Pipe Sleeves at Penetrations
LG requires that all pipe penetrations through walls, floors, and pipes buried underground be properly insulated and routed through an
appropriate wall sleeve of sufficient size to prevent compression of refrigerant pipe insulation and promote free movement of the pipe within
the sleeve. Use 4"+ curved sheet metal saddles between the bottom surface of the pipe and the bottom surface of the penetration. Under-
ground refrigerant pipe shall be routed inside a protective sleeve to prevent insulation deterioration.
Figure 34: Pipe Sleeve Options.
Diameter of penetrations shall be determined by pipe diameter plus the thickness of the insulation.
Underground Refrigerant Piping
Refrigerant pipe installed underground should be routed inside a vapor tight
protective sleeve to prevent insulation deterioration and water infiltration. Re-
frigerant pipe installed inside underground casing must be continuous without
any joints. Underground refrigerant pipe must be located at a level below the
frost line.
Provide expansion joints in long pipe segments and place in an accessible
conduit box for inspection. Use galvanized curved sheet metal saddles at all
mounting points. Pipe should be allowed to move freely linearly.
Table 54: Utility Conduit Sizes.
Liquid Pipe
1
1/2 (2.0
2,5
1/4 (1.0)
4
3
3/8 (1-1/8)
3
4
1/2 (1-1/2)
4
5
5/8 (1-5/8)
4
5
3/4 (1-3/4)
4
5
OD pipe diameter in inches; Values in parenthesis () indicate OD of pipe with insulation jacket.
1
Diameter of pipe with insulation. Thickness of pipe insulation is typical. Actual required thickness may
2
vary based on surrounding ambient conditions and should be calculated and specified by the design
engineer.
3
Insulation thickness (value in parenthesis) = 3/8 inch.
4
Insulation thickness (value in parenthesis) = 1 inch.
Insulation thickness (value in parenthesis) = 3/4 inch.
5
142 |
Vapor Pipe
1
)
5/8 (2-1/8
)
3/4 (2-1/4
2,5
4
4
4
5
5
5
5
5
5
5
©
Figure 35: Typical Arrangement of Refrigerant Pipe and
Cable(s) in a Utility Conduit.
)
2,5
Vapor Line
Insulation Material
Liquid Line
Pipe Sleeve
Insulation
Material
Min. 18 Gauge
Power/Communication
Cable

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