[a.
_____
b.
_____].
2.8.1.2
Breeching Cleanout Doors
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NOTE: Specify locations for breeching access and
cleanout doors. Where practical show locations on
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Construct cleanout doors of not less than 5 mm 3/16 inch thick steel plate.
Secure cleanout doors to a 32 by 32 by 5 mm 1 1/4 by 1 1/4 by 3/16 inch
thick angle frame with 10 mm 3/8 inch hot-dipped galvanized mounting bolts
welded to the angle frame and spaced not over 150 mm 6 inches on center.
Weld frame to breeching and provide a 3 mm 1/8 inch gasket between frame
and cleanout door. Cleanout doors shall be not less than 610 by 610 mm 24
by 24 inches except where breeching dimensions are smaller, in which case
the cleanout door shall be full height of the breeching and not less than
610 mm 24 inches in width. Provide breeching cleanout doors at the
following locations [and where indicated]:
[a.
_____
b.
_____].
2.8.1.3
Breeching Connections and Joints
Weld breeching joints [unless indicated or specified otherwise]. Welding
shall conform to AWS D1.1/D1.1M and AWS D1.3. Bolts for bolted connections
shall be hot-dipped galvanized bolts not less than 15 mm 1/2 inch diameter
and spaced not more than 80 mm 3 inches apart, with hot-dipped galvanized
lockwashers, and nuts. Provide bolted joints with a minimum of 3 mm 1/8
inch thick gaskets. Bolt flanged breeching connections to boilers,
equipment items, dampers, expansion joints, and breeching accessories.
Flanged breeching connections to equipment shall be drilled to match
flanges on equipment. Flanged joints shall be sealed welded to make
connection gas-tight.
2.8.1.4
Breeching Structural Materials
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NOTE: Designer shall detail breeching supports and
breeching stiffening. Breeching hangers shall be
designed to carry not less than 5 times the
breeching weight, or the breeching weight plus
weight of fly ash when breeching is half full plus
136 kg 300 pounds whichever is greater.
Hangers
for rectangular breeching shall be of the trapeze
type with angle or channel support members and
hanger rods. Breeching shall be stiffened with
angle or channel members as required to withstand
internal breeching static pressure. Designer shall
verify that expansion joint flexure for axial travel
is suitable. Expansion joints shall be detailed on
the drawings.
SECTION 15502N
Page 87