How do you calculate torque for a gasket?
Bolt Stress (Gasket Seating) = Force per bolt (4) / Root Area of Bolt (3) = 12051 / 0.302 = 39,903 psi. This is the minimum bolt torque for a 6-inch class 150 flanged joint utilizing spiral wound gasket and ASTM A193 B7 bolts.
Can you reuse a flexitallic gasket?
This type of gasket consists of a grooved metal plate with a process-compatible sealer filling the groove. Under load, the material in the groove compresses and seals the process. With proper maintenance, which includes sealer reapplication, these gaskets can be reused.
What is flexitallic gasket?
The Flexitallic Spiral Wound Gasket is the precision-engineered solution for flanged joints, heat exchangers, boiler handholes, manholes and other high temperature, high pressure applications—providing resistance to virtually every known corrosive and toxic element.
What is the difference between CG and CGI gasket?
Style CG – Is comprised of a sealing element and outer metal ring. Style CGI – In addition to an outer metal ring the CGI style gasket is fitted with an inner metal ring, constraining the sealing element on both internal and external diameters.
How is flange bolt torque calculated?
Using a calibrated torque wrench (Manual or Hydraulic Torque Wrench), flange bolt torque can be measured during flange assembly….Applied Torque, T= (k∙f∙d)/12 in FPS Unit
- T=Torque in ft-lb.
- k=Dimensionless nut factor or tightening factor.
- f=axial force in pounds.
- d=Nominal bolt diameter in inches.
What is hot torque?
Hot bolting is a technique of re-tightening or completely replacing the connection bolts which hold together sections of piping. The added difficulty of this procedure is the fact that the pipes are left “live” and in use during this process, which gives rise to the term “hot” bolting.
Are RTJ gaskets reusable?
Coining deforms and yields the gasket hence its reuse will not reliably achieve the required seal….Is it safe then to reuse the gaskets only for hydrotest purpose.
| Ring Gasket Material | Maximum Hardness for Ring Gaskets | |
|---|---|---|
| Brinell | Rockwell “B” Scale | |
| 4–6 chrome 1⁄2 Mo | 130 | 72 |
| Type 410 | 170 | 86 |
| Type 304 | 160 | 83 |
Are PTFE gaskets reusable?
PTFE’s nature as an inelastic material means that reuse or multiple installations of the same seal will not be possible. Unlike rubber compounds, PTFE will not return to it’s original shape and cross-section once deformed during installation and use.
What is a CGI gasket?
The CGI spiral wound is the new standard spiral wound gasket per ASME B16. 20 and is required unless otherwise specified by the user. The CGI is a CG style spiral wound fitted with an internal ring which gives an additional compression limiting stop and prevents inward buckling ring.
What is CGI in gaskets?