Angle wrapping issue of standard saddle shims
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In NB/T47065.1, does the arc length of the saddle pad need to be increased based on the actual outer diameter of the equipment? The issue of the shimming plate’s arc angle being 12 degrees greater than that of the saddle’s arc angle… I hadn’t noticed this before; today, when working with a high-voltage device, I found that the arc length of the shimming plate for the standard saddle was not sufficient
There is no need to use shims for reinforcement; it’s simply because the shims for horizontal container saddles are designed with a 12-degree angle in mind
For example, if the diameter of your equipment is DN700 and the thickness of the cylinder exceeds 50, then you can choose an DN800 saddle, in which case the arc length of the gasket should be sufficient
Actually, if calculated strictly, it’s still not enough; it’s just that in the vast majority of cases, no one pays attention to this
The dimensions of the shims are calculated precisely only when reinforcement with shims is necessary