Dos & Don'ts of Fire Sprinkler System Installation

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  • Read the manufacturer's installation instructions and install product accordingly.
  • Follow recommended safe work practices.
  • Make certain that thread sealants, gasket lubricants, or fire-stop materials are compatible with GF Harvel® sprinkler pipe.
  • If painting is desired, use only water-based latex paints.
  • Keep pipe and fittings in original packaging until needed.
  • If pipe and fittings are stored outdoors, cover with an opaque tarp.
  • Follow proper handling procedures.
  • Use tools specifically designed for plastic pipe and fittings.
  • Use proper solvent cement and follow application instructions.
  • Use a drop cloth to protect interior finishes.
  • Cut the pipe ends square.
  • Deburr and bevel the pipe end with a chamfering tool before cementing.
  • Rotate the pipe a quarter turn when bottoming pipe in fitting socket when solvent cementing.
  • Avoid puddling of solvent cement in fittings and pipe.
  • Make certain no solvent cement is on sprinkler head and adapter threads.
  • Make certain that solvent cement does not run and plug the sprinkler head orifice.
  • Follow manufacturer's recommended cure times before pressure testing.
  • Fill lines slowly and bleed the air from the system before pressure testing.
  • Support sprinkler head properly to prevent lift up of the head through the ceiling when activated.
  • Keep threaded rod within 1/16" of the pipe or use a surge arrestor.
  • Install GF Harvel sprinkler pipe and fittings in wet systems only or specially listed dry systems.
  • Use only insulation and/or glycerin/water solutions for freeze protection.
  • Allow for movement due to expansion and contraction.
  • Renew your GF Harvel sprinkler pipe and fittings installation training every two years.


  • Don't use edible oils such as Crisco® for gasket lubricant.
  • Don't use petroleum or solvent-based paints, sealants, lubricants, or fire-stop materials.
  • Don't install tape, insulated wire, or cable in direct contact with GF Harvel sprinkler pipe.
  • Don't use glycol-based solutions as anti-freeze.
  • Don't mix glycerin/water solutions in contaminated containers.
  • Don't use Teflon® tape and thread sealants simultaneously.
  • Don't use solvent cement that has exceeded its shelf life or has become discolored or gelled.
  • Don't allow solvent cement to plug the sprinkler head orifice.
  • Don't connect rigid metal couplers to GF Harvel grooved adaptors.
  • Don't thread, groove, or drill GF Harvel sprinkler pipe.
  • Don't use solvent cement near sources of heat or open flame, or when smoking.
  • Don't pressure test until recommended cure times have passed.
  • Don't pressure test with air.
  • Don't cut pipe with dull or broken cutting-tool blades.
  • Don't use ratchet cutters below 50°F.
  • Don't use GF Harvel sprinkler pipe that's been stored unprotected outdoors and is faded in color.
  • Don't allow threaded rod to come in contact with the pipe.
  • Don't install GF Harvel sprinkler pipe in cold weather without allowing for expansion.
  • Don't install GF Harvel sprinkler pipe and fittings in dry systems unless specially listed for such use.

Note: These lists do not constitute a complete installation guide.