NFPA 20 Sensing Lines
NFPA 20 Sensing Lines
(OP)
Does the current NFPA 20 allow for the use of flexible tubing or hoses on the pressure sensing lines or are they required to be rigid?
The 2007 NFPA 20 reads: "5.29.3 The pressure-sensing line shall be brass, copper, or series 300 stainless steel pipe or tube, and the fittings shall be of 1/2in (15mm) nominal size."
Would corrugated stainless steel tubing (CSST), or stainless steel hose comply?
The 2007 NFPA 20 reads: "5.29.3 The pressure-sensing line shall be brass, copper, or series 300 stainless steel pipe or tube, and the fittings shall be of 1/2in (15mm) nominal size."
Would corrugated stainless steel tubing (CSST), or stainless steel hose comply?





RE: NFPA 20 Sensing Lines
4.30.3* The pressure sensing line shall be brass, rigid copper pipe Types K, L, or M, or Series 300 stainless steel pipe or tube, and the fittings shall be of 1⁄2 in. (15 mm) nominal size.
A.4.30.3 The use of soft copper tubing is not permitted for a
pressure sensing line because it is easily damaged.
Just my thought, but it seems like they need to be rigid piping.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: NFPA 20 Sensing Lines
4.30.3* The pressure sensing line shall be brass, rigid copper pipe Types K, L, or M, or Series 300 stainless steel pipe or tube, and the fittings shall be of 1⁄2 in. (15 mm) nominal size.
I believe because of the amount of vibration it needs to be ridgid.
RE: NFPA 20 Sensing Lines
Thanks for the quick replies!
RE: NFPA 20 Sensing Lines
RE: NFPA 20 Sensing Lines
Just looking for ways to simplify installation a bit.
Any suggestions?
RE: NFPA 20 Sensing Lines
Copper (rigid pipe not tubing) should be cinch to solder in from the pump to the nearby controller. A twenty foot stick and a few elbows would do it. What could be simpler? Something like a braided washing machine hose would physically work, but why spent the big $$ on the pump, controller, dedicated electrical service, fire resistance rated enclosure, etc. and then go cheap on this cheap but important piece.