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APPENDIX C — Reference Tables & Figures
Plumbing Movement
Figure 18 | PVC Plumbing Offset
Right: A common industry standard for a plumbing offset
(see Table 5 below for offset distance L).
This offset can be oriented vertically (as shown) or hori-
zontally to accommodate thermal movement in the direc-
tion of the plumbing. Notice the loose plumbing mounting
points which restrict movement except in the axial direc-
tion. Refer also to Figures 19, 20, 21 and 22 A, B and
C, along with associated tables for further use of offsets.
Figure 19 | Row Plumbing Movement
A straight line of plumbing can move up 1" for a length of 25ft. Plumbing expansion joints are advised to accommodate this movement. An industry
standard method, such as an offset should be used so that the line can move as needed. Refer to Table 5 for Regular PVC joint offset lengths and offset
type for a length of pipe.
(2X) Straight
Line Plumbing
Fixed
Support
Length of Pipe (ft)
Thermal Exp (in)
L/4 (in)
L/2 (in)
Single Offset Dist (in)
Exposed PVC (in)
Table 5 | Thermal Expansion of PVC Piping
To accommodate for long plumbing runs, refer to the table or incorporate an industry standard plumbing offset. If
space doesn't permit, it may be advisable to use an alternate Offset method (as in Figures 20 or 21) for a single
long run of plumbing.
L/4
Guide
Supports
Length of Pipe
Expansion Dimensions Chart for PVC Offsets
Most Installations Most Installations, with Bank Movement
10
20
30
5/8
13/16
1-1/4
7
10
12
14
20
24
28
40
48
8-11/16 14-11/16 18-11/16 22-11/16 26-11/16 28-11/16 32-11/16 34-11/16 36-11/16 38-11/16
Guide
Supports
Only
L
L/2
Regular PVC Pipe
40
50
60
1-1/2
1-13/16
2-1/8
14
16
17
28
32
34
56
64
68
Direction of
Plumbing
Movement
L/4
Fixed
Support
(~4ft)
T=80°F
Uncommon Installations
70
80
90
2-3/8
2-11/16
3
19
20
21
38
40
42
76
80
84
®
100
3-5/16
22
44
88
34
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