Length of bolts required for ZJ ring connection flange
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For a certain orifice flow meter, with ZJ ring connection flanges, what is the required length of the bolts?
I’ve never heard of ZJ ring connection flanges; I’ve used RJ ones. With pictures showing the approximate distance between the flanges, it’s possible to calculate the length
I added the normal length plus the thickness of the shims and the thickness of the orifice plate, and found that it was much longer than the actual length on site. The project is a renovation, and there are previous data available
The gasket is seated in the ring groove; it cannot be added directly – the distance between the flanges must be considered
How do I calculate the distance between flanges?
If it’s the RJ face, this data is specified in the standards and can be found; I’m not sure which standard applies to what you mentioned
Provide the total thickness of the flanges at both ends of the flow meter; specifying the flange standards is also acceptable. It’s advisable to know the size of the matching threads, such as Mxx. Generally, the length of a single-bolt connection is equal to the flange thickness multiplied by 2, plus the thickness of the gasket, plus 15 mm, plus the height of the nut. For double-bolt connections, replace 15 mm with 25 mm and add the height of another nut as well