A group of low pressure boilers, operating as a single unit with a common header and with no isolation valves, shall be considered as one unit for registration purposes only and tagged with one New Hampshire jurisdiction identification number.

Source. (See Revision Note at chapter heading for Lab 1200) #5371, eff 4-10-92, EXPIRED: 4-10-98 New. #7210, eff 2-28-00; ss by #9076, eff 1-24-08; ss by #11071, eff 4-11-16