Si30-408 REFNET Piping
Introduction 19
5.2 For Refrigerant Piping
Guideline for Tightening Flare Nut (When No Torque Wrench is Available.)
Notes: 1. When pipe jointing with flare nut, use both open-ended spanner and a torque wrench.
2. If no torque wrench is available, refer to the following item 3 as a guide.
3. In the work of tightening flare nut, there should be a spot where the tightening torque
suddenly increases. Thereafter, tighten further with tightening angle shown in above list.
Bending Radius in Pipe and Flare Tightening Torque
Processing Dimension for Flare Section
Calculation List on Equivalent Length of Joint (For Reference)
Unit: m
Piping size Tightening angle (guideline) Recommended arm length of tool
φ6.4 60º ~ 90º Approximately 150mm
φ9.5 60º ~ 90º Approximately 200mm
φ12.7 30º ~ 60º Approximately 250mm
φ15.9 30º ~ 60º Approximately 300mm
φ19.1 20º ~ 35º Approximately 450mm
Piping size Bending radius Tightening torque (N·cm)
φ6.4 30 to 40 mm 1420 ~ 1720
φ9.5 30 to 40 mm 3270 ~ 3990
φ12.7 40 to 60 mm 4950 ~ 6030
φ15.9 40 to 60 mm 6180 ~ 7540
φ19.1 — 9720 ~ 11860
Piping size
Dimension-A
Flared shape
R22, R407C For R410A
φ6.4 8.6 ~ 9.0 8.7 ~ 9.1
φ9.5 12.6 ~ 13.0 12.8 ~ 13.2
φ12.7 15.8 ~ 16.2 16.2 ~ 16.6
φ15.9 19.0 ~ 19.4 19.3 ~ 19.7
φ19.1 23.3 ~ 23.7 (24)
Pipe diameter
Type
φ6.4 φ9.5 φ12.7 φ15.9 φ19.1 φ25.4 φ31.8
L joint
0.16 0.18 0.20 0.25 0.35 0.45 0.55
Trap bend
1.41.31.52.02.43.44.0
REFNET joint
0.5
REFNET header
1.0
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