IDOD SYSTEMS
The Galvanized Pipe Specialists
Creators of GAL-5 and GAL-7 Sprinkler Pipe
IDOD Systems, LLC • PO BOX 1635 • Homewood,
Illinois 60430
CRR Value Comparison / Explanation
Wall
Thickness / CRR Value Comparison
|
Nom. |
Schedule |
|
Threadable |
|
|
Grooved |
|
Grooved |
|
|
|
|
|
|
|
|
|
|
|
|
|
2" |
.059" |
1 |
.035" |
0.21 |
.065" |
1.05 |
.080" |
2.14 |
|
|
|
|
|
|
|
|
|
|
|
|
|
1½" |
.055" |
1 |
.031" |
0.18 |
.065" |
1.3 |
.080" |
2.64 |
|
|
|
|
|
|
|
|
|
|
|
|
|
1¼" |
.051" |
1 |
.028" |
0.17 |
.065" |
1.63 |
.065" |
1.63 |
|
Developed by Underwriters Laboratories (UL), the CRR value is a
factoring system comparing the thinnest exposed area of a threaded schedule 40
pipe after a mating threaded coupling is attached and tightened. The UL
assigned CRR value implies relative life span of the exposed area.
Zinc protection is not considered when assigning the CRR value. See zinc life chart for added value of galvanized
coating