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Do spray and fire hydrant pressure relief orifice plates use the same atlas? What is the atlas number?
The pressure relief orifice plate of the sprinkler and fire hydrant does not use atlas. The automatic sprinkler system atlas number is 04s206 atlas, and the hydrant atlas number is 04s202 atlas.
According to the current national atlas of relevant fire laws and regulations, 04S202 standard atlas is still adopted for indoor fire hydrants. See page 3 1-33 for details about the installation of pressure relief orifice plate. The automatic sprinkler system adopts 04S206_ automatic sprinkler system and water spray fire extinguishing facilities. Please refer to page 74 for the installation of pressure relief orifice.
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