keith Payne Products Gaskets and Seals

ASME Boiler and Pressure Vessel Code Calculations

Gasket Materials and Contact Facings
Gasket factors (m) for Operating Conditions and Minimum Design Seating Stress (Y)

Gaket Material Gasket
factor
(m)
Minimum
design
seating
Stress(Y)
(psi)

Sketches
and
Notes
Seating Width
(See Table)
Gasket
Group
Column
Self-Energizing Types
O-rings, metalicelastomer, and other gasket types considered as self-sealing
0 0      
Elastomers without fabric
Below 75A Shore Durometer
75A or higher Shore Durometer
0.50
1.00
0
200

(1a), (1b),
(1c),
(1d),
(4),
(5)

ll
Elastomers with cotton fabric insertion 1.25 400
Vegetable fibre 1.75 1100
Flexicarb based prod ucts MRG
Flexpro
NR
SR
ST
2.00
2.00
2.00
2.00
2.00
2,500
2,500
2,500
2,500
2,500
   
Spiral wound metal, with filter graphite filler 3.00 10,000 (1a), (1b)
Spiral wound metal with PTFE filler 3.00 5,000    
Corrugated metal
with filler
or
Corrugated metal jacketed
with filler
Soft aluminum
Soft copper or brass
Iron or soft steel
Monel or 4%-6% chrome
Stainless steels & Nickel based alloys
2.50
2.75
3.00
3.25
3.50
2900
3700
4500
5500
6500
(1a), (1b)
Corrugated metal Soft aluminium
Soft copper or brass
Iron or soft steel
Monel or 4%-6% chrome
Staimless steel based alloys

2.75
3.00
3.25
3.50
3.75
3700
4500
5500
6500
7600
(1a), (1b),
(1c), (1d)
Flat metal jacketed,
with filler
Soft aluminium
Soft copper or brass
Iron or soft steel
Monel
4%-6% chrome
Stainless steels & Nickel based alloys

3.25
3.50
3.75
3.50
3.75
3.75
5500
6500
7600
8000
9000
9000
(1a), (1b),
(1c),
(1d),
(2)
Grooved metal Soft aluminium
Soft copper or brass
Iron or soft steel
Monel or 4%-6% chrome
Stainless steels & Nickel based alloys
3.25
3.50
3.75
3.75
3.25
5500
6500
7600
9000
10100
(1a), (1b),
(1c),
(1d),
(2),
(3)
Solid flat metal Soft aluminium
Soft copper or brass
Iron or soft steel
Monel or 4%-6% chrome
Stainless steels & Nickel based alloys
4.00
4.75
5.50
6.00
6.50
8800
13000
18000
21800
26000
(1a), (1b),
(1c),
(1d),
(2),
(3),
(4),
(5)
l
Ring joint Iron or soft steel
Monel or 4%-6% chrome
Stainless steels & Nickel based alloys
5.50
6.00
6.50
18000
21800
26000
(6)

Notes:
This table gives a list of many commonly used gasket materials and contact facings with suggested design values of m and y that have generally proved satisfactory in actual service when using effective gasket seating width b given in the table following. The design values and other details given in this table are suggested only and are not mandatory.

The surface of a gasket having a lap should not be against the nubbin.

 

Effective Gasket Seating Width - See Note (1)

Notes:
(1) The gasket factors listed only apply to flanged joints in which the gasket is contained entirely within the inner edges of the bolt holes.

(2) Where serrations do not exceed 1/64" depth and 1/32" width spacing, sketches (1b) and (1d) shall be used.




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