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Plumbing Movement
APPENDIX C — Reference Tables & Figures
Table 6 | Thermal Expansion of PVC Piping with Flexible PVC Offset
To accommodate for long plumbing runs or bank movement using a Flexible PVC Line, refer to the table below. Since the plumbing can be mounted
as Fixed or Guide supports, an Conventional Offset can also be useful to absorb some or all of the movement in plumbing and solar banks. Other indus-
try standard methods are also acceptable.
*Note: This method requires thorough UV protection of the Flexible PVC Hose segment. (See Phase II, Pool Plumbing)
Expansion Dimensions Chart Flexible PVC Line Offsets T=80°F
Most Installations Most Installations, with Bank Movement Uncommon Installations
Length of Pipe (ft)
10 20 30 40 50 60 70 80 90 100
Thermal Expansion (in)
0.6 0.8 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3
Leg L/4 (in)
4.5 5.0 5.6 6.2 6.7 7.2 7.8 8.3 8.8 9.3
Leg L/2 (in)
9.0 10.0 11.3 12.3 13.4 14.4 15.5 16.6 17.6 18.7
Single Offset Dist L (in)
18 20 23 25 27 29 31 33 35 37
Exposed Flexible PVC (in)
3.8 4.7 6.0 7.1 8.1 9.2 10.3 11.3 12.4 13.4
Expansion Dimensions Chart for PVC Line Offsets with 3.5" Couplers in Line T=80°F
Most Installations Most Installations, with Bank Movement Uncommon Installations
Length of Pipe (ft)
10 20 30 40 50 60 70 80 90 100
Thermal Expansion (in)
0.6 0.8 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3
Leg L/4 (in)
8.7 9.2 9.8 10.4 10.9 11.4 12.0 12.5 13.0 13.5
Leg L/2 (in)
17.4 18.4 19.7 20.7 21.8 22.9 23.9 25.0 26.0 27.1
Single Offset Dist L (in)
35 37 39 41 44 46 48 50 52 54
Table 7 | Thermal Expansion of PVC Piping with PVC and Coupler Offset
To accommodate for long plumbing runs or bank movement using a PVC Line and two Couplers in the offset, refer to the table below. Since the
plumbing can be mounted as Fixed or Guide supports, an Conventional Offset can also be useful to absorb some or all of the movement in plumbing
and solar banks. Other industry standard methods are also acceptable.
2X Hose Coupler
Assembly with Pipe
Adapters and PVC
(2X) Straight
Line Plumbing
Fixed
Support
Guide
Supports
Fixed
Support
Length of Pipe
(~4ft)
*Flexible PVC Hose
(2X) Straight
Line Plumbing
Fixed
Support
Guide
Supports
Fixed
Support
(~4ft)
Length of Pipe
Figure 20 | Flexible PVC Offset
Figure 21 | Doubled Coupler Offset
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