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Requirements for pressure gauges in vertical coal-fired steam boilers

What are the requirements for the purchase of pressure gauges for vertical coal-fired steam boilers?
  In addition to the pressure gauge directly connected to the steam space of the drum (shell), each vertical coal-fired steam boiler shall be equipped with a pressure gauge at the following locations: before the vertical coal-fired steam boiler feed water regulating valve; Dividable economizer outlet; between superheater outlet and main steam valve; vertical coal-fired steam boiler starter separator; vertical coal-fired steam boiler once in front of valve of steam-water system; forced circulation boiler water circulation pumping and inlet Reheater exit, entrance.
Requirements for pressure gauges in vertical coal-fired steam boilers
Vertical coal-fired steam boiler
  For vertical coal-fired steam boilers with a rated steam pressure of less than 2.5 MPa, the pressure gauge should not be lower than 2.5; for a vertical coal-fired steam boiler with a rated steam pressure greater than or equal to 2.5 MPa, the pressure gauge ** * The degree should not be lower than 1.5; the pressure gauge should be selected according to the working pressure. The limit value of the dial of the pressure gauge of the vertical coal-fired steam boiler should be 1.5 to 3.0 times of the working pressure. It is recommended to use 2 times; the size of the dial of the vertical coal-fired steam boiler pressure gauge should ensure that the pressure indicator value can be clearly seen by the furnace personnel. The dial diameter should not be less than 100mm.
Requirements for pressure gauges in vertical coal-fired steam boilers
  The pressure gauge selected for vertical coal-fired steam boilers shall comply with the requirements of relevant technical standards. The verification and maintenance of vertical coal-fired steam boilers shall comply with the regulations of the *** metrology department. The pressure gauge should be calibrated prior to installation and the next calibration date indicated. A red line on the dial of the pressure gauge indicates the working pressure. The pressure gauge should be sealed after verification.

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