Installation SiEN34-705
34 General Information
Flange
Connection
a) The flange sheet surface should be clean and undamaged. (Clean any dirt away with a cloth
and check that there has been no damage.)
b) Coat the flange sheet surface with refrigeration oil (Ester or ether oil) and then insert the
packing. (Do not use SUNISO oil.)
c) Tighten the bolts in opposite corners first to ensure that the connection is true.
Important points
1. Only clean refrigeration/oil should be used to coat the flange. (i.e. free from dirt or water)
2. The correct amount of torque should be applied when tightening the flange bolts.
Standard torques for tightening screws and bolts
ISO hexagonal bolt
[Example]
Order:A→C→B→D The bolts should be tightened little by
little in the above order such that the
same degree of torque is applied
evenly to each corner.
Class 5.8(5T) 10.9(10T)
Size kgf-cm ±15% N-m ±15% kgf-cm ±15% N-m ±15%
M8 125 1230 302 2960
M10 257 2520 620 6080
M12 436 4280 1,050 10,300
M16 1,030 10,100 2,480 24,300
M20 2,050 20,100 4,950 48,500
Refrigerant oil (Ester or ether oil.)
Flange indentation
Packing
Flange projection
Stop valve
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