(a) The owner or operator shall prepare a boiler for
internal inspection.
(b) Preparation of the boiler for internal inspection
shall include:
(1) all water being drawn off;
(2) the boiler internal watersides thoroughly washed;
(3) removal of loose scale as practicable; and
(4) where boilers are equipped with removable internals,
these internals need not be completely removed provided assurance
exists that deterioration in regions rendered inaccessible by the
internals is not occurring to an extent that might constitute a hazard,
or to an extent beyond that found in more readily accessible parts
of the vessel.
(5) All manholes and handholes, washout plugs, and
plugs shall be removed for complete inspection, as required by the
inspector.
(6) The furnace and combustion chambers shall be cooled
and cleaned to provide safe access to the inspector.
(7) Brickwork and refractory shall be removed as required
by the inspector in order to determine the condition of the boiler,
headers, furnace, supports, or other parts.
(8) The pressure gage shall be removed for cleaning
of the siphon and testing, if necessary.
(9) All low-water cutoff devices shall be dismantled,
cleaned, and prepared for inspection. Probe-type low water cutoff
devices shall be removed from the boiler.
(10) The cross-tees and plugs shall be removed to ensure
complete clearance on the water and steam sides.
(11) Before removing the manholes or handholes and
entering any part of the boiler connected to a common header with
other boilers, any leakage of steam or hot water shall be eliminated.
(A) The nonreturn and stop valves shall be closed,
locked out and tagged out and drain valves between the two valves
opened.
(B) The feedwater valves must be closed, locked out
and tagged out.
(C) After draining the boiler, the blowdown valves
shall be closed, locked out and tagged out.
(D) Blowdown lines, where practicable, shall be disconnected
between pressure parts and valves.
(E) All vent and drain lines shall be opened.
(12) Gaskets on manholes and handholes of pressure-retaining
items, with exception of access and inspection doors of furnace and
convection pass, shall be replaced with new gaskets upon reinstallation.
(A) Re-use of gaskets is prohibited.
(B) Gaskets shall be installed in accordance with the
manufacturer's recommendations.
(C) The use of sealing compounds is prohibited on manhole
and handhole gaskets on water/steam pressure parts.
(c) If the boiler is jacketed so that the seams of
shells, drums, or domes cannot be seen, enough of the jacketing, setting
wall, or other form of casing or housing shall be removed to permit
inspection to determine the safety of the boiler, provided such information
cannot be determined by other means.
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