anim_logo.gif (2572 bytes) Thermodynamics Style 7000
Pure Expanded Flexible Mineral Graphite Plain Homogeneous Gasketing Sheets with Inhibitor
Page 6 of 7
STATIC SEALING
All the attributes of expanded mineral graphite in dynamic situations also apply to interface sealing of static connections. Gaskets cut from the foil material of 0.5mm thick and 1.0g/cc density or from sheets of 1.0mm and 2.0mm thick at a density of 1.0g/cc, seal off under relatively low seating stresser and when fully contained can be used for pressures of 300 bar or more.
The material in this form is, of course, fragile and requires care in handling.
MAXIMUM RECOMMENDED TORQUE
(80% yield strength, coarse thread bolts)

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Compare minimum required torque with the maximum recommended torque for your bolt grade. (For strict compliance with ASME code, also check that the allowable bolt stress is not exceeded.)
Important note: This design guide is based on the ASME boiler & pressure vessel code guidelines which are believed to be reliable. However, Thermodynamics assumes no responsibility for their accuracy and shall not under any circumstances be liable for any damages arising out of the use of this design guide.
FITTING INSTRUCTIONS :
 
1. Check flange faces for cleanliness. Remove dirt, scale and any traces of old gasket material.
 
2. Check that flange faces have the correct finish.
 
3. Inspect flange faces for mechanical or corrosion damage.
 
4. Check the abutment and alignment of flange faces. Space between flanges should not be excessive and the degree out of parallel should be noted in relation to the gasket type in use. Available blot load should only be used to compress the gasket, not to pull flange faces together. Check type, material and dimensions of gasket and of bolting for conformity with spec.
 
5. Locate gasket in position and tighten nuts equally until gasket is secured in place. Re-check that assembly is correct.
 
6. Bolts should be tightened in a uniform fashion and in small degrees, not in a clockwise fashion but in a sequence of opposed bolts. Where a particular bolt stress is requires, then some form of measurement should be employed to ensure correct tensioning. If torque wrenches are used. then nuts must be well lubricated and free turning. Measurement of bolt elongation can also be used as can hydraulic bolt tensioners on larger flanges. Where a specific degree of gasket compression is desired, use feeler gauges to achieve the correct condition.
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