13 NCAC 13 .0423             MODEL HOBBY BOILERS

Model hobby boilers shall meet the following requirements:

(1)           Each boiler shall have:

(a)           an operating pressure gauge that shall not be less than 1 ½ times nor more than four times the operating pressure of the boiler;

(b)           two safety relief valves each of which shall be capable of protecting the boiler from over pressurization. Requirements for ASME/NB certification are waived. If an ASME/NB safety relief valve is utilized, only one safety relief valve is required;

(c)           an accessible mud-ring valve;

(d)           a water gauge glass; and

(e)           if constructed of copper, a fusible plug in the top of the crown sheet.

(2)           The construction requirements established by the Department of Labor shall not apply to Model Hobby Boilers when the following requirements are met:

(a)           Documentation to verify the design and construction specifications have been reviewed and accepted by the Chief Inspector; and

(b)           The boiler and associated components have been constructed using material rated for the intended service.

(3)           Upon completion of the inspection and payment of the applicable fees referenced in this Chapter, the Chief Inspector shall issue a Certificate of Inspection valid for one year.

History Note:        Authority G.S. 95‑69.11; 95‑69.14;

Eff. July 1, 2006;

Pursuant to G.S. 150B-21.3A, rule is necessary without substantive public interest Eff. July 22, 2018;

Amended Eff. November 1, 2024; April 1, 2022.