Hi All
Go to
HTTP://www.state.mi.us/webapp/orr/admincode.asp?AdminCode=Single&Admin_Num=4
0804001&Dpt=CI&RngHigh= and read the entire law.
These look to be the important parts of the law but you should read the
entire thing.
(22) "Hobby" means an interest or activity that a person pursues in his
or her leisure time without compensation.
(31) "Miniature boiler" means a power boiler that does not have any of
the following:
(a) An inside diameter of the shell of more than 16 inches
(b) A working pressure of more than 100 psig
(c) A gross volume of more than 5 cubic feet
(d) More than 20 square feet of heating surface.
(32) "Miniature locomotive boiler" means a miniature hobby steam
locomotive boiler which operates on a narrow gauge track that is less than
24 inches wide and which is for public display or use.
Rule 24. (1) The owner shall ensure the inspection, repair, and
alteration of boilers and piping is in accordance with the national board
inspection code, 1998 edition, and its addenda, except as modified by
these rules. The national board inspection code is adopted by reference in
these rules and may be reviewed at the Okemos office of the Department of
Consumer and Industry Services, Bureau of Construction Codes, Boiler
Division. The code may be purchased from the National Board of Boiler and
Pressure Vessel Inspectors, 1055 Crupper Avenue, Columbus, Ohio 43229, or
from the Department of Consumer and Industry Services, Bureau of
Construction Codes, 2501 Woodlake Circle, Okemos, Michigan 48864, at a
cost as of the time of adoption of these rules of $70.00 each.
Rule 47. These rules do not apply to any of the following:
(a) A boiler under federal control.
(c) A miniature steam or marine engine used for a hobby.
(d) A boiler used in the power plant of a self-propelled vehicle
designed primarily for transportation of persons or property on a highway,
except
for a vehicle used exclusively on stationary rails or tracks.
R 408.4153 Illegal to operate without valid certificate.
Rule 153. A person, firm, partnership, or corporation shall not operate
a boiler under pressure in this state to which these rules apply without a
valid inspection certificate. An owner or user who causes a boiler to be
operated without possessing a valid certificate shall be subject to the
penalty prescribed in section 24 of the act.
R 408.4512 Miniature hobby locomotive boilers.
Rule 512. (1) A miniature hobby locomotive boiler is designed to be
operated on a narrow gauge track of less than 24 inches.
(2) 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 boiler division of the department of consumer and industry
services shall issue an identifying state number and a deputy boiler
inspector shall attach it to the boiler.
(3) The owner shall ensure that a miniature hobby locomotive boiler has
the following minimum equipment:
(a) A pressure gauge calibrated to approximately 1½ times the operating
pressure, but not more than 4 times the operating pressure.
(b) A means to extinguish the fire in the firebox in the event of a low
water condition.
(c) Two means of feeding water to the boiler, 1 of which shall 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 will be approximately 10% of the distance between the
crown sheet and the shell, but not less than ½ 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 shall be equal to or greater than the
calculated steam generating capacity of the boiler.
(4) The owner shall determine the maximum allowable working pressure of a
miniature hobby locomotive boiler by calculation. In place of acceptable
calculations, the owner shall subject the boiler to a hydrostatic pressure
test of 1½ times the owner specified operating pressure.
(5) Triennially, during the certificate inspection, the owner shall
hydrostatically test the boiler to not more than 1½ times the operating
pressure.
(6) The boiler division shall develop procedures, policies and check
lists necessary to accomplish the inspections and tests required by these
rules.
(7) Repairs to miniature hobby locomotive boilers are exempt from the
licensing and permitting requirements of the act. Repair welding shall be
made in accordance with the requirements of ASME code section IX. Welding
procedures and performance qualification shall be filed with the boiler
division for review.
