Trane CVHH - Bolt-Tightening Sequence for Water Piping Connections; Flanges W Ith 8 or 12 Bolts; Flanges W Ith 16 or 20 Bolts; Pressure Testing Waterside Piping

Installation: Water Piping
CVHH-SVX001A-EN 29
Bolt-Tightening Sequence for
Water Piping Connections
This section describes a bolt-tightening sequence for
flanges with flat gaskets or O-rings. Remember that
improperly tightened flanges may leak.
Note: Before tightening any of the bolts, align the flanges.
Flanges with 8 or 12 Bolts
Tighten all bolts to a snug tightness, following the
numerical sequence for the appropriate bolt pattern as
shown below. Repeat this sequence to apply the final
torque to each bolt.
Flanges with 16 or 20 Bolts
Tighten only the first half of the total number of bolts to a
snug tightness, following the numerical sequence for the
appropriate bolt pattern as shown below. Next,
sequentially tighten the remaining half of the bolts in
numerical order.
Pressure Testing Waterside Piping
Waterside design pressure is either 1034.2 or 2068.4 kPag
(150 or 300 psig); refer to unit nameplate or to submittal
documentation.
NOTICE:
Equipment Damage!
Failure to follow these instructions could result in
equipment damage. Do not over pressurize the system
or exceed design pressure. Always perform as a hydro
pressure test with water present in piping and
waterboxes.
1
3
45
7
8
26
8 bolt flange
1
3
4
10 11
9
5
7
8
12
26
12 bolt flange
1
1
5
5
9
9
20
22
3
3
4
4
66
7
7
8
8
10
10
19
18
17
16
16
15
15
14
14
13
13
12
12
11
11
16 bolt flange 20 bolt flange