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 |
|
|
|
Asbestos with suitable binder |
|
|
|
Elastomers with cotton fabric |
1.25 |
400 |
2,800 |
Elastomers with asbestos fabric |
|
|
|
Vegetable fiber |
1.75 |
1,100 |
7,600 |
Spiral-wound, asbestos filled: |
|
|
|
Corrugated metal, w/ msbestos or corrugated |
|
|
|
Corrugated metal: |
|
|
|
Flat metal, jacketed asbestos filled |
|
|
|
Grooved metal |
|
|
|
Solid flat metal |
|
|
|
Ring joint |
|
|
|