Test Operation
5.
Insulation Work
5.1 Insulation material and thickness
1). Insulation material
℃Insulation material should adopt the material which is able to endure the pipe’s temperature: no less than 70 in the high-pressure side, no
℃less than 120 in the low-pressure side(For the cooling type machine, no requirements at the low-pressure side.)
℃Example: Heat pump type----Heat-resistant Polyethylene foam (withstand above 120 )
℃Cooling only type---- Polyethylene foam (withstand above 100 )
2). Thickness choice for insulation material
Insulation material thickness is as follows:
Pipe diameter (mm) Adiabatic material thickness
Refrigerant pipe Φ6.4—Φ25.4 10mm
Φ28.6—Φ38.1 15mm
Drainage pipe Inner diameterΦ20—Φ32 6mm
5.2 Refrigerant pipe insulation
1). Work Procedure
① Before laying the pipes, the non-jointing parts and non-connection parts should be heat insulated.
② When the gas proof test is eligible, the jointing area, expanding area and the flange area should be heat insulated
2). Insulation for non-jointing parts and non-connection parts
wrong right
Gas pipe and liquid pipe should
not be put together to insulate
Insulate the gas pipe
(cooling only)
Insulate the gas pipe and
liquid pipe
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