What are the standard about straight mirrors?

  Straight mirrors are roughly divided into two categories, both pressure vessels, boilers, reactors used on some of the equipment mirrors and pipe mirrors used for pipelines. According to the use of different windows can also be broken down into disc-type equipment mirror, box-type equipment, glass tube view mirror, glass pipe mirror. Glass mirrors are generally connected with welding, thread, live access, quick install, flange and so on.
standard:
  Material standard: WCB, LCB, CF8, CF3, CF8M flange scraper through sight glass, CF3M, 20 # steel, 16MN, and a variety of special synthetic steel.
  Flange standard: HG, GB, HGJ, JB, ANSI, JIS cross lens, DIN, BS, NF.
  Manufacturing standards: GB RSG42S flange scraper through sight glass, American standard, German standard, the standard.
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