The values of m and y shown in the following table are listed in ASME Section VIII Div. 1 code in App. 2. As stated in the code, these are only suggested values. For more accurate values of m and y, please contact your gasket manufacturer.
|
Gasket Material |
Gasket Factor m |
Seating Stress y, psi (MPa) |
Facing Column |
|---|---|---|---|
|
Self energizing types (O rings, elastomer, other gasket types considered as self-sealing) |
0.00 |
0 |
II |
|
Elastomers without fabric or high percent of mineral fiber |
|||
|
Below 75A Shore Durometer |
0.50 |
0 |
II |
|
75A Shore Durometer or higher |
1.00 |
200 (1.4) |
II |
|
Mineral fiber with suitable binder for operating conditions |
|||
|
1/8 inch thick |
2.00 |
1600 (11) |
II |
|
1/16 inch thick |
2.75 |
3700 (26) |
II |
|
1/32 inch thick |
3.50 |
6500 (45) |
II |
|
Elastomer with cotton fabric insertion |
1.25 |
400 (2.8) |
II |
|
Elastomer with mineral fiber fabric insertion (with or without wire reinforcement) |
|
|
|
|
3 ply |
2.25 |
2200 (15) |
II |
|
2 ply |
2.50 |
2900 (20) |
II |
|
1 ply |
2.75 |
3700 (26) |
II |
|
Vegetable Fiber |
1.75 |
1100 (7.6) |
II |
|
Spiral-wound metal, mineral fiber filled |
|||
|
Carbon Steel |
2.50 |
10000 (69) |
II |
|
Stainless Steel, Monel, and nickel-base alloys |
3.00 |
10000 (69) |
II |
|
Corrugated metal, mineral fiber inserted or Corrugated metal, jacketed, mineral fiber filled |
|||
|
Soft aluminum |
2.50 |
2900 (20) |
II |
|
Soft copper or brass |
2.75 |
3700 (26) |
II |
|
Iron or soft steel |
3.00 |
4500 (31) |
II |
|
Monel or 4-6% Chrome |
3.25 |
5500 (38) |
II |
|
Stainless - steels and nickel-base alloys |
3.50 |
6500 (45) |
II |
|
Corrugated metal, not filled |
|||
|
Soft aluminum |
2.75 |
3700 (26) |
II |
|
Soft copper or brass |
3.00 |
4500 (31) |
II |
|
Iron or soft steel |
3.25 |
5500 (38) |
II |
|
Monel or 4-6% Chrome |
3.50 |
6500 (45) |
II |
|
Stainless steel |
3.75 |
7600 (52) |
II |
|
Flat metal, jacketed, mineral fiber filled |
|||
|
Soft aluminum |
3.25 |
5500 (38) |
II |
|
Soft copper or brass |
3.50 |
6500 (45) |
II |
|
Iron or soft steel |
3.75 |
7600 (52) |
II |
|
Monel |
3.50 |
8000 (55) |
II |
|
4-6% chrome |
3.75 |
9000 (62) |
II |
|
Stainless steels and nickel-base alloys |
3.75 |
9000 (62) |
II |
|
Grooved metal |
|||
|
Soft aluminum |
3.25 |
5500 (38) |
II |
|
Soft copper or brass |
3.50 |
6500 (45) |
II |
|
Iron or soft steel |
3.75 |
7600 (52) |
II |
|
Monel or 4-6% Chrome |
3.75 |
9000 (62) |
II |
|
Stainless steels and nickel-base alloys |
4.25 |
10100 (70) |
II |
|
Solid flat metal |
|||
|
Soft aluminum |
4.00 |
8800 (61) |
I |
|
Soft copper or brass |
4.75 |
13000 (90) |
I |
|
Iron or soft steel |
5.50 |
18000 (124) |
I |
|
Monel or 4-6% chrome |
6.00 |
21800 (150) |
I |
|
Stainless steels and nickel-base alloys |
6.50 |
26000 (180) |
I |
|
Ring Joint |
|||
|
Iron or soft steel |
5.50 |
18000 (124) |
I |
|
Monel or 4-6% chrome |
6.00 |
21800 (150) |
I |
|
Stainless steel |
6.50 |
26000 (180) |
I |