What is Gasket m Factor?
Understanding the Importance of Gasket m Factors in Piping Stress Analysis
Gasket m factors are an important consideration in piping stress analysis. These factors are used to calculate the necessary compressive load on the gasket to maintain a seal when the pipe is pressurized. The gasket m factor is also known as the maintenance factor and is dimensionless, with the values typically calculated as a ratio of the net pressure to the internal pressure. In Caesar II software, the gasket m factor is referred to as the leak pressure ratio. This constant ensures that the flange has sufficient strength and available bolt load to provide a good seal without leakage, while also withstanding the effects of hydrostatic end force or internal pressure.
Gasket Factor m – Understanding its Importance
The gasket factor m is an important parameter in determining the required bolt load for a flanged joint to work properly under operating conditions. ASME BPVC Sec VIII specifies the required bolt load as Wm1= H + Hp = 0.785G2P + (2b x 3.14GmP).
Gasket y Factor – What It Is and Its Significance
The gasket y factor is the minimum gasket or joint‐contact‐surface unit seating load. This factor is also known as gasket seating stress and is provided in KPa, N/mm2, or lb/in2 unit in the Caesar II software. It is also an important parameter for ASME flange stress calculations and must be provided as an input.
Gasket Factor m – Understanding Its Importance
The gasket factor m is an essential parameter for determining the required bolt load for a flanged joint to operate properly under operating conditions. According to the ASME BPVC Sec VIII, the required bolt load is calculated using the formula Wm1= H + Hp = 0.785G2P + (2b x 3.14GmP).
Gasket Y Factor – What It Is and Its Significance
The gasket y factor is the minimum gasket or joint‐contact‐surface unit seating load. This factor is also referred to as gasket seating stress and is provided in KPa, N/mm2, or lb/in2 unit in the Caesar II software. It is an important parameter in ASME flange stress calculations and must be provided as an input.
| 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 | 0.5 | 0 | 0 |
| 75A or higher shore durometer | 1 | 200 | 1,400 |
| Asbestos with a suitable binder | |||
| 1/8″ thick | 2 | 1,600 | 11,000 |
| 1/16″ thick | 2.75 | 3,700 | 26,000 |
| 1/32″ thick | 3.5 | 6,500 | 45,000 |
| Elastomers with cotton fabric | 1.25 | 400 | 2,800 |
| Elastomers with asbestos fabric | |||
| 3 ply | 2.25 | 2,200 | 15,000 |
| 2 ply | 2.5 | 2,900 | 20,000 |
| 1 ply | 2.75 | 3,700 | 26,000 |
| Vegetable fiber | 1.75 | 1,100 | 7,600 |
| Spiral-wound, asbestos-filled: | |||
| Carbon | 2.5 | 10,000 | 69,000 |
| Stainless, Monel, and nickel alloys | 3 | 10,000 | 69,000 |
| Corrugated metal, mineral fiber inserted, or corrugated metal, jacketed mineral fiber filled | |||
| Soft aluminum | 2.5 | 2,900 | 20,000 |
| Soft copper or brass | 2.75 | 3,700 | 26,000 |
| Iron or soft steel | 3 | 4,500 | 31,000 |
| Monel or 4%-6% chrome | 3.25 | 5,500 | 38,000 |
| Stainless steels and nickel alloys | 3.5 | 6,500 | 45,000 |
| Corrugated metal: | |||
| Soft aluminum | 2.75 | 3,700 | 26,000 |
| Soft copper or brass | 3 | 4,500 | 31,000 |
| Iron or soft steel | 3.25 | 5,500 | 38,000 |
| Monel or 4%-6% chrome | 3.5 | 6,500 | 45,000 |
| Stainless steels and nickel alloys | 3.75 | 7,600 | 52,000 |
| Flat metal, jacketed asbestos filled | |||
| Soft aluminum | 3.25 | 5,500 | 38,000 |
| Soft copper or brass | 3.5 | 6,500 | 45,000 |
| Iron or soft steel | 3.75 | 7,600 | 52,000 |
| Monel | 3.5 | 8,000 | 55,000 |
| 4%-6% chrome | 3.75 | 9,000 | 62,000 |
| Stainless steels and nickel alloys | 3.75 | 9,000 | 62,000 |
| Grooved metal | |||
| Soft aluminum | 3.25 | 5,500 | 38,000 |
| Soft copper or brass | 3.5 | 6,500 | 45,000 |
| iron or soft steel | 3.75 | 7,600 | 52,000 |
| Iron or 4%-6% chrome | 3.75 | 9,000 | 62,000 |
| Stainless steels and nickel-base alloys | 4.25 | 10,100 | 70,000 |
| Solid flat metal | |||
| Soft aluminum | 4 | 8,800 | 61,000 |
| Soft copper or brass | 4.75 | 13,000 | 90,000 |
| Iron or soft steel | 5.5 | 18,000 | 124,000 |
| Monel or 4%-6% chrome | 6 | 21,800 | 150,000 |
| Stainless steels and nickel alloys | 6.5 | 26,000 | 180,000 |
| Ring joint | |||
| Iron or soft steel | 5.5 | 18,000 | 124,000 |
| Monel or 4-6% chrome | 6 | 21,800 | 150,000 |
| Stainless steels and nickel-base alloys | 6.5 | 26,000 | 180,000 |