1072                              LAWS OF MARYLAND                       [CH. 430

days following each certificate inspection made by such inspectors,
file a report of such inspection with the Chief Boiler Inspector upon
appropriate forms as promulgated by the National Board of Boiler
and Pressure Vessel Inspectors. The filing of reports of external
inspections shall not be required except when such inspections dis-
close that the boiler is in a dangerous condition.

(b)  If the report filed pursuant to subsection (a) of this section
shows that a boiler is found to comply with the rules and regulations
of the Board, the Chief Boiler Inspector shall issue to such owner
or user an inspection certificate bearing the date of inspection and
specifying the maximum pressure under which the boiler may be
operated. Such inspection certificate shall be valid for not more than
fourteen (14) months from its date in the case of power boilers
and high pressure, high temperature water boilers and twenty-six
(26) months in the case of low pressure steam or vapor heating
boilers, hot water heating boilers or hot water supply boilers, except
that, when the Board has granted an extension of the period between
certificate inspections as permitted by Section 176 of this Act, the
certificate shall be valid for a grace period of two (2) months beyond
the expiration date of the current certificate. Certificates shall be
posted under glass in the room containing the boiler inspected. If
the boiler is not located within the building, the certificate shall be
posted in a location convenient to the boiler inspected or in any
place where it will be accessible to interested parties.

(c)  No inspection certificate issued for an insured boiler based
upon a report of a special inspector shall be valid after the boiler
for which it was issued shall cease to be insured by a company duly
authorized by this State to provide such insurance.

(d)   The Chief Boiler Inspector or his authorized representative
may at any time suspend an inspection certificate when, in his
opinion, the boiler for which it was issued cannot be operated with-
out menace to the public safety or when the boiler is found not to
comply with the rules and regulations herein provided. Each sus-
pension of an inspection certificate shall continue in effect until
such boiler shall have been made to conform to the rules and regu-
lations of the Board and until such inspection certificate shall have
been reinstated.

(e)  After twelve (12) months following the date on which this
Act becomes effective, it shall be unlawful for any person, firm, part-
nership or corporation to operate in this State a boiler without a
valid inspection certificate. Any person, firm, partnership or corpo-
ration that shall operate a boiler without such inspection certificate,
or at a pressure exceeding that specified in such inspection certifi-
cate, or interfere with or impede the Commissioner of Labor and
Industry, hi