Again thanks to all. Further research shows that ASME RTP-1 is most likely the prevailing document in this area. Two classes of FRP construction are considered. One has a maximum stress value of 1800PSI and the other 3000PSI. Torque recommendations do not exceed 40 ft/lbs. To a gasket material...
Thanks for all. further research shows that ASME RTP-1 provides guidelines for material selection and installation. However manufacturers recommendations vary from this. None of the documentation I've found suggests the use of expanded PTFE, which is widely used in the field, although having...
I am researching gasket installation on FRP piping and vessels and my search results have typically lead back to the vessel/piping or flange manufacturer. I'm curious if there's any empirical data on FG or FRP flanges that details maximum allowable stress? I've also been cautioned in vessel...
IMO, the use of anti seize prevents galling and lubricates the threads. Lubrication using anti-seize may well give only a slight frictional advantage over clean dry rust free hardware, but that advantage opens up widely on used, galled, rusted, or corroded materials. Although torque is no...
Just to add a point for clarity. Metal jacketed graphite as you use now will probably not create issues with galvanic corrosion however it may be prudent to inspect for it's presence at next inspection. The mention of galvanic corrosion and use of graphite laminates was cautionary primarily...
The poor gasket is typically the last in a series of design calculations made to compensate for any number of sins. Heat exchangers and boilers are maintenance heavy equipment in terms of being opened up for routine inspection. The frequency of removing and reinstalling covers tends to allow for...
Hevi: You're absolutely correct, and your reasoning is why 85% of gasket failures occur. I know the corresponding error rates of hand tools vs. calibrated torque wrenches, vs. hydraulic tensioners. I'm aware of the fact that surface rust is rarely cleaned from nuts and bolts in the field. Nine...
The program I was using is strictly for Klinger materials and their sealing properties. Spiralwounds are a different animal in terms of the necessity of compressing the winding to affect a seal, using the outer guide ring as a "stop." Theoretically the stop prevents over-tightening however on...
Late to the party, but here goes. The torque range is dependent on the minimum sealing stress and maximum load of the gasket. The following data assumes using a non-asbestos compressed gasket material, specifically Thermoseal (Klinger) C-4433 X 1/8" Thick Ring Gasket. Grade B7A Bolts. Flat face...
Rubber will generally take a compression set in the same direction as it was calendared or rotary cured. If fabricated by cutting the 30" lengths across the width of the 36" roll stock, it may improve the tendency to set in that direction. (Although it may not produce the best yield, you may try...
