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  1. ForestWilson

    How often does an air compressor typically run?

    This should be troubleshooted. Very common to have a defective check valve on the compressor or air supply line, causing pressure to drop and trip the pressure switch. Also, the pressure switch should be on the system, not the compressor or upstream of the check valve.
  2. ForestWilson

    Flexible Coupling

    I don't have NFPA 13 in front of me now, But the chapter you are referring to is specific for seismic protection. In the USA, the Building Code determines if the area is in a seismic zone and the Layout Technician of the sprinkler system uses NFPA 13 Chpater on Seismic Protection. In your case...
  3. ForestWilson

    NFPA 25: 4.1.8 Information Sign

    Light, I also use laminated papers and attach to the Riser. Until the industry makes these steel signs what else can we do? I'm not going to custom mfr a sign that nobody else is installing

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