Understanding the use of fiberglass and PVC pipes
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1. How are FRP/PVC pipes connected to swaged flanges? Are the pipes already fitted with swaged flanges at the time of manufacture? Does anyone have pictures or screenshots from piping software?； 2. Which standard should be used, HG/T21636-1987 or HG3731-2004? The standard doesn’t state that it replaces the old one 3. The standard HG3731-2004 only specifies the specifications of the pipe fittings; it does not provide instructions for using the corresponding slip flanges, bolts, and nuts. Can one therefore choose to use other standards, such as HG20592-2009?
If it is a loop flange, there is no need to install it in advance; it can be installed on-site. This is the advantage of loop flanges.