The R-Type ring gasket can be ordered to two different profiles, oval or octagonal in cross-sections. Both types have identical pitch diameter as the flange groove they correspond to. These gaskets are used in pressures up to 5,000 PSI. The octagonal type has a higher sealing coeffient than the oval, therefore being the better gasket of the two. The oval type is the only gasket that will fit a bottom radiused groove. Flanges with flat bottom v-grooves will accept either style. Gaskets that have been torqued initiating a metal-to-metal seal should be discarded and not reused.
Pressure Class Ratings
Wolar R-Gaskets For API 6B Flanges
150 | 3/600 | 900 | 1500 | 2500 | 2000 | 3000 | 5000 | 10000 | |
R-11 | 1/2 | ||||||||
R-12 | 1/2 | 1/2 | |||||||
R-13 | 3/4 | 1/2 | |||||||
R-14 | 3/4 | 3/4 | |||||||
R-15 | 1 | ||||||||
R-16 | 1 | 1 | 1 | 3/4 | |||||
R-17 | 1 1/4 | ||||||||
R-18 | 1 1/4 | 1 1/4 | 1 1/4 | 1 | |||||
R-19 | 1 1/2 | ||||||||
R-20 | 1 1/2 | 1 1/2 | 1 1/2 | 1 1/2 | 1 1/2 | 1 1/2 | |||
150 | 3/600 | 900 | 1500 | 2500 | 2000 | 3000 | 5000 | 10000 | |
R-21 | 1 1/4 | ||||||||
R-22 | 2 | ||||||||
R-23 | 2 | 1 1/2 | 2 | ||||||
R-24 | 2 | 2 | 2 | 2 | |||||
R-25 | 2 1/2 | ||||||||
R-26 | 2 1/2 | 2 | 2 1/2 | ||||||
R-27 | 2 1/2 | 2 1/2 | 2 1/2 | 2 1/2 | |||||
R-28 | 2 1/2 | ||||||||
R-29 | 3 | ||||||||
R-30 | 3 | ||||||||
150 | 3/600 | 900 | 1500 | 2500 | 2000 | 3000 | 5000 | 10000 | |
R-31 | 3 | 3 | 3 | 3 | |||||
R-32 | 3 | ||||||||
R-33 | 3 1/2 | ||||||||
R-34 | 3 1/2 | ||||||||
R-35 | 3 | 3 | |||||||
R-36 | 4 | ||||||||
R-37 | 4 | 4 | 4 | 4 | |||||
R-38 | 4 | ||||||||
R-39 | 4 | 4 | |||||||
R-40 | 5 |