If your design is of medium to high pressure
it is recommended that you utilize fabric reinforced rings. The following is a guide to pressure rating of multiple rings, including flat bottom rings.
PRESSURE RATING OF MULTIPLE RINGS
NUMBER OF RINGS
250 - 500
500 - 2,000
2,000 - 5,000
5,000 - 8,000
A homogeneous ring may be also used for sealing at low pressure. Do not include the homogeneous ring in calculating pressure rating. Due to the different material, it is difficult
to rate this type of ring. If you wish to use all homogeneous rings, tests should be conducted to verify design stability.