Trane CenTraVac CVHE - Screw-Tightening Sequence for Water Piping

CVHE-SVX005C-EN
37
6. Tighten fasteners alternately and equally until housing
screw pads are firmly together (metal-to-metal); refer to
“Screw-Tightening Sequence for Water Piping
Connections,” p. 37. Do NOT excessively tighten
fasteners.
Note: Uneven tightening may cause the gasket to pinch.
Figure 19. Typical Victaulic
®
flange gasket
configuration
Table 9. Installation data for 150 psig (1034.2 kPaG) flange adapters (Style 741)
Nominal Pipe Size
Assembly Screw
Size
(a)
Number of Assembly
Screws Required
Screw Pattern Diameter
Weight
in. mm in. in. mm lb
kg
4 114.3 5/8 x 3 8 7.5 191 7.7 3.5
5 141.3 3/4 x 3-1/2 8 8.5 216 9.3 4.2
6 168.3 3/4 x 3-1/2 8 9.5 241 10.3 4.7
8 219.1 3/4 x 3-1/2 8 11.75 298 16.6 7.5
10 273.0 7/8 x 1/44 12 14.25 362 24.2 11.0
12 323.9 7/8 x 1/4 12 17 432 46.8 21.2
14 355.6 1 x 4-1/2 12 18.75 476 75 34.0
16 406.4 1 x 4-1/2 16 21.25 540 90 40.8
(a)
Screw size for conventional flange-to-flange connection. Longer screws are required when flange washer must be used.
Table 10. Installation data for 300 psig (2068.4 kPaG) flange adapters (Style 743)
Nominal Pipe Size
Assembly Screw
Size
(a)
Number of Assembly
Screws Required
Screw Pattern Diameter
Weight
in. mm in. in. mm lb
kg
4 114.3 3/4 x 3-3/4 8 7.88 200 15.3 6.9
5 141.3 3/4 x 4 8 9.25 235 17.7 8.0
6 168.3 3/4 x 4-1/2 12 10.63 270 23.4 10.6
8 219.1 3/4 x 4-3/4 12 13 330 34.3 15.6
10 273.0 1 x 5-1/4 16 15.25 387 48.3 21.9
12 323.9 1-1/8 x 5-3/4 16 17.75 451 70.5 32.0
(a)
Screw size for conventional flange-to-flange connection. Longer screws are required when flange washer must be used.
Screw-Tightening Sequence for
Water Piping Connections
This section describes a screw-tightening sequence for
flanges with flat gaskets or O-rings. Remember that
improperly tightened flanges may leak.
Note: Before tightening any of the screws, align the flanges.
Flange screw torque requirements are provided in
the following table.
Installation: Water Piping