Gasket Seating Stress - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

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
Table 2-5.1



Gasket Material

Gasket
Factor
m

Seating Stress
y
(psi)

Seating Stress
y
(KPa)

Self-energizing types (O rings, metallic elastomer,
and other self-sealing types)



0



0



0

Elastomers without fabric or a high percent of
asbestos fiber:

Below 75A shore durometer
75A or higher shore durometer


0.50
1.00


0
200


0
1,400

Asbestos with suitable binder

1/8" thick
1/16" thick
1/32" thick

2.00
2.75
3.50

1,600
3,700
6,500

11,000
26,000
45,000

Elastomers with cotton fabric

1.25

400

2,800

Elastomers with asbestos fabric

3 ply
2 ply
1 ply

2.25
2.50
2.75

2,200
2,900
3,700

15,000
20,000
26,000

Vegetable fiber

1.75

1,100

7,600

Spiral-wound, asbestos filled:

Carbon
Stainless, monel, nickel alloys

2.50
3.00

10,000
10,000

69,000
69,000

Corrugated metal, w/ msbestos or corrugated
metal, jacketed with:

Soft aluminum
Soft copper or brass
Iron or soft steel
Monel or 4%-6% chrome
Stainless steels and nickel alloys


2.50
2.75
3.00
3.25
3.50


2,900
3,700
4,500
5,500
6,500


20,000
26,000
31,000
38,000
45,000

Corrugated metal:

Soft aluminum
Soft copper or brass
Iron or soft steel
Monel or 4%-6% chrome
Stainless steels and nickel alloys

2.75
3.00
3.25
3.50
3.75

3,700
4,500
5,500
6,500
7,600

26,000
31,000
38,000
45,000
52,000

Flat metal, jacketed asbestos filled

Soft aluminum
Soft copper or brass
Iron or soft steel
Monel
4%-6% chrome
Stainless steels and nickel alloys

3.25
3.50
3.75
3.50
3.75
3.75

5,500
6,500
7,600
8,000
9,000
9,000

38,000
45,000
52,000
55,000
62,000
62,000

Grooved metal

Soft aluminum
Soft copper or brass
iron or soft steel
Iron or 4%-6% chrome
Stainless steels and nickel alloys

3.25
3.50
3.75
3.75
4.25

5,500
6,500
7,600
9,000
10,100

38,000
45,000
52,000
62,000
70,000

Solid flat metal

Soft aluminum
Soft copper or brass
Iron or soft steel
Monel or 4%-6% chrome
Stainless steels and nickel alloys

4.00
4.75
5.50
6.00
6.50

8,800
13,000
18,000
21,800
26,000

61,000
90,000
124,000
150,000
180,000

Ring joint

Iron or soft steel
Monel or 4-6% chrome
Stainless steels and nickel-base alloys

5.50
6.00
6.50

18,000
21,800
26,000

124,000
150,000
180,000