Mich. Admin. Code R. 339.5248 - Miniature hobby locomotive boilers
Rule 248.
(1)
At the initial inspection of a miniature hobby locomotive boiler, the owner
shall provide the chief boiler inspector with design specifications and
calculations for review and acceptance. If a boiler is approved for use, then
the departments boiler division shall issue an identifying state number and a
deputy boiler inspector shall attach it to the boiler.
(2) The owner shall ensure that a miniature
hobby locomotive boiler has all the following minimum equipment:
(a) A pressure gauge graduated to
approximately 1-1/2 times the operating pressure, but not more than 4 times the
operating pressure.
(b) A means to
extinguish the fire in the firebox if of a low water condition.
(c) Two means of feeding water to the boiler,
1 of which must be operable while the locomotive is stationary.
(d) A water level gauge glass located so that
the top of the bottom nut of the gauge glass is approximately 10% of the
distance between the crown sheet and the shell, but not less than 1/2 inch
above the crown sheet.
(e) Two
safety valves set at not more than 10% above the operating pressure for boilers
fabricated after the effective date of the rules. The capacity of the safety
valves must be equal to or greater than the calculated steam generated capacity
of the boilers.
(3) The
owner shall determine the maximum allowable working pressure of the miniature
hobby locomotive boiler by calculation. In place of acceptable calculations,
the owner shall subject the boiler to a hydrostatic pressure test of 1-1/2
times the owner specified operating pressure.
(4) Every 3 years, during the certificate
inspection, the owner shall hydrostatically test the boiler to not more than
1-1/2 times the operating pressure.
(5) The departments boiler division shall
develop procedures, policies, and check lists necessary to accomplish the
inspections and tests required by these rules.
(6) Repairs to miniature hobby locomotive
boilers are exempt from the licensing and permitting requirements of the act.
Repair welding must be made pursuant to the requirements of ASME code section
IX. Welding procedures and performance qualifications must be filed with the
departments boiler division for review.
Notes
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