2.2.13.2
Drum Outlets
Drum outlets shall be applied in approved manner and of approved strength
per ASME BPVC SEC I. Outlets shall include but not be limited to:
a.
Steam nozzle of 2.07 MPa 300 pounds, flanged to receive specified
nonreturn stop and check valve, and able to withstand forces and
moments imposed by connected piping. Studdery will not be
permitted.
b.
Boiler vent on shell or steam drum as approved by ASME BPVC SEC I,
to be equipped with 2.07 MPa 300 pound steel steam gate valve,
nipples, and ells to vent away from operator.
c.
Safety valve outlets in required number and size, located
approximately as indicated, or as necessary to permit straight run
of vent through roof.
d.
Water column and low water cutoff connections with outside screw
and yoke (OS & Y) valves, [lockable,] [and with locks and keys
furnished].
e.
Connections for boiler water feed, chemical admission, continuous
blowdown and water sampling combined, located as indicated on
plans.
f.
Intermittent blowdown connections.
g.
Water level sensor connections (for level control).
h.
Pressure gauge and pressure switch connections.
2.2.13.3
Tubes
Tubes shall be of the diameter and arrangement that best suits the
manufacturer's recommendation to meet the specified design criteria. Tubes
shall be electric-welded or seamless steel, and shall be connected to the
drums and header by being expanded into bored tube seats (standard fit) or
by being welded in accordance with ASME BPVC SEC IX. Tube wall thickness
shall be at least the minimum recommended by the manufacturer. Finned
tubes shall be allowed only when the fuel is gas or oil and shall provide a
continuously welded bond between the tube surface and the helically wound
fin. Tube materials shall comply with ASTM A 192/A 192M and provide
optimum life expectancy and corrosion resistance. Tube headers, channels,
and manifold pipes shall provide sufficient volume to ensure no part of the
boiler will become water-starved. Radii of all bends in tubes shall be
such that standard turbine type cleaners can easily pass through for
cleaning of full length of tubes.
2.2.13.4
Baffles
Baffles shall be
arranged to bring the products of combustion into contact
with the heating
surfaces without excessive loss of draft. Baffles shall
be gas-tight and
shall be either a refractory material or metal suitable
for temperatures
encountered.
2.2.14
Fire-Tube Boiler
Boiler shall be packaged type and shall include programming control system
SECTION 15846A
Page 25
Previous Page
