89.4 - EXEMPTIONS.
89.4 EXEMPTIONS.
1. The provisions of this chapter shall not apply to the
following boilers:
a. Boilers of railway locomotives subject to federal
inspection.
b. Boilers operated and regularly inspected by railway
companies operating in interstate commerce.
c. Boilers under the jurisdiction and subject to inspection
by the United States government.
d. Steam heating boilers and unfired steam pressure vessels
associated therewith and mobile power boilers used exclusively for
agricultural purposes.
e. Heating boilers in residences.
f. Fire engine boilers brought into the state for temporary
use in times of emergency.
g. Low pressure heating boilers used in buildings other than
those for public assembly.
h. Hot water heating boilers used for heating pools or spas
regulated by the department of public health pursuant to chapter
135I.
i. Water heaters used for potable water if the capacity is
less than or equal to fifty gallons, the burner input is less than or
equal to fifty thousand British thermal units, and the maximum
allowable working pressure is less than one hundred sixty pounds per
square inch.
2. Unfired steam pressure vessels not exceeding the following
limitations are not required to be reported to the commissioner and
shall be exempt from regular inspection under provisions of this
chapter:
a. A vessel not greater than five cubic feet in volume and
not having a pressure greater than two hundred fifty pounds per
square inch.
b. A vessel not greater than one and one-half cubic feet in
volume with no limit on pressure.
3. Internal inspections shall not be required on unfired steam
pressure vessels where they have been manufactured without inspection
plate and where it would be necessary for them to be drilled in order
to be inspected. The existence of such unfired pressure vessels
shall be reported to the commissioner, and certified by the
commissioner that the unfired pressure vessel is in a satisfactory
condition for the purpose for which it is used.
4. Jacketed direct or indirect fired vessels built and installed
in accordance with the American society of mechanical engineers code,
section VIII, division 1, appendix 19, shall not be considered
boilers or power boilers for purposes of this chapter and shall not
be required to meet the American society of mechanical engineers
standard for controls and safety devices for automatically fired
boilers. However, jacketed direct or indirect fired vessels as
described in this subsection shall be subject to inspection under
section 89.3 as pressure vessels. Section History: Early Form
[C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, § 89.3; C79, 81, § 89.4]
Section History: Recent Form
92 Acts, ch 1098, § 4; 98 Acts, ch 1222, §21, 28; 2005 Acts, ch
47, §1; 2007 Acts, ch 135, §4