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NFPA 2001 - about Fittings

Question asked by pracha.p on Jul 13, 2020

Dear Sir or Madam,

 

We have question about NFPA 2001.

Refer to NFPA 2001 (edition 2018) (As attached) for
4.2.2.2 "Fittings shall have a minimum rate working pressure equal to or greater than the minimum design working pressure specified in 4.2.1.1, for the clean agent being used, or otherwise listed or approved.
4.2.2.3 "For systems that employ the use of a pressure-reducing device in the distribution piping, the fitting downstream of the device shall have a minimum rate working pressure equal to or greater than the maximum anticipated pressure in the downstream piping
AND "Table A.4.2.2.2 (a) and  Table A.4.2.2.2 (b) shown "Minimum Acceptance Fittings" will be Malleable iron class 300 & Forge steel class 2000"
For my system will be :
1)  for IG-100 (300 bar in cylinder at 15 'C) with pressure reducing device, downstream pressure of pressure reducing device is not more than 60 bar. 
  Question :  Can I use Carbon steel fitting ASK Butt-Weld fitting A234, Sch#40  (Seamless) (as attached) in stead of Malleable iron fitting class 300 and Forge steel fitting class 2000 ?
2)  for FK-5-1-12 (Novec 1230) (70 bar in cylinder at 20 'C) 
  Question :  Can I use Carbon steel fitting ASK Butt-Weld fitting A234, Sch#40  (Seamless) (as attached) in stead of Malleable iron fitting class 300 and Forge steel fitting class 2000 ?
Thank  you.
Pracha (Mr.)

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