Old instruments, come and take a look!
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Question 1: What are the functions of threaded connectors, flexible joints, and pipe clamps listed in the materials table for instrument installation? In what situations are each of them used? I recently reviewed the drawings from a major design institute, and all three types of materials were used in the diagrams related to instrument gas supply and cable routing. Moreover, shouldn’t cable threading be done using cable glands? It’s a bit confusing why cable glands and connectors are used interchangeably! Question 2: Also, in the instrument installation diagram, can ANSI flanges be used with GB studs and nuts? Question 3: Looking at the drawings from different periods produced by large design institutes, there are significant changes in the installation materials; for example, the differences between 2001 and 2008 were substantial. In 2001, only slip joints were used, with no threaded joints, pipe clamps, or anything of the kind! Also, how is the quantity of things like union fittings, elbows, and tees counted? Is it by individual count, or is it based on experience? Thank you all!
Personal opinion: 1. Threaded connectors, flexible joints, and pipe clamps are all used for taking pressure readings from air supply pipes or for passing pipes through them. The application conditions depend on the differences in connection methods: threaded rods have external threads, pipe clamps have internal threads, while union joints use threaded collars for welding. I don’t know which type of facility you’re referring to; in our facility, straight connectors and flexible connectors are generally used for gas supply, and wire ducts are employed solely for cable installation, unless the cables are run through pipes individually in which case some connectors need to be considered. 2. It can be used, but it is not recommended. 3. Threaded pipe clamps are terms used in written documentation; they serve to ensure standardization and consistency in drawings, and they actually refer to the same thing ； The number of connectors is determined based on the number of instrument points, with a margin added; the number of wire ducts is estimated. This post was last edited by desong on 2009-4-20 11:55.]
It will be helpful for you to study the \"Installation Manual for Self-Controlled Instruments\" HG/T 21581-95.
1. Threaded connectors, swivel joints, and pipe clamps are all used for taking pressure from air supply pipes or for passing pipes through them. The application conditions depend on the differences in connection methods: threaded rods have external threads, pipe clamps have internal threads, while union joints use threaded collars for welding. Cable laying uses only conduit boxes, unless the cables are pulled through pipes individually in which case some joints need to be considered. 2. It can be used, but it is not recommended. 3. The number of connectors is determined based on the number of instrument points, with a margin added; the number of wire glands is estimated. :lol