Specifies the initial seating stress required for the gasket being used. This entry is required only if the software performs ASME stress calculations.
Typical units (depending on your unit system):
-
lb/in2
-
KPa
-
N/mm²
The following table, extracted from Sect VIII Div. 1, gives gasket factors for some common types of gaskets.
Gasket Materials and Contact Facings Notes |
|||
---|---|---|---|
|
Gasket |
Seating Stress |
Seating Stress |
Self-energizing types (O rings, metallic elastomer, |
|
|
|
Elastomers without fabric or a high percent of Below 75A shore durometer |
|
|
|
Asbestos with suitable binder 1/8" thick |
2.00 |
1,600 |
11,000 |
Elastomers with cotton fabric |
1.25 |
400 |
2,800 |
Elastomers with asbestos fabric 3 ply |
2.25 |
2,200 |
15,000 |
Vegetable fiber |
1.75 |
1,100 |
7,600 |
Spiral-wound, asbestos filled: Carbon |
2.50 |
10,000 |
69,000 |
Corrugated metal, w/ msbestos or corrugated Soft aluminum |
2.50 |
2,900 |
20,000 |
Corrugated metal: Soft aluminum |
2.75 |
3,700 |
26,000 |
Flat metal, jacketed asbestos filled Soft aluminum |
3.25 |
5,500 |
38,000 |
Grooved metal Soft aluminum |
3.25 |
5,500 |
38,000 |
Solid flat metal Soft aluminum |
4.00 |
8,800 |
61,000 |
Ring joint Iron or soft steel |
5.50 |
18,000 |
124,000 |