[Piping shall be welded in accordance with qualified procedures, using
performance qualified welders and welding operators. Procedures and
welders shall be qualified in accordance with ASME BPVC SEC IX. Welding
procedures qualified by others, and welders and welding operators qualified
by another employer may be accepted as permitted by ASME B31.1. The
Contracting Officer shall be notified 24 hours in advance of tests and the
tests shall be performed at the work site. The welder or welding operator
shall apply his assigned symbol near each weld he makes as a permanent
record.] [Welding and nondestructive testing procedures for piping shall be
as specified in Section [05093] [15216N] WELDING PRESSURE PIPING.]
Structural members shall be welded in accordance with Section 05090A
WELDING, STRUCTURAL.
3.4
INSULATION
The insulation shall be installed so that it will not be damaged by pipe
expansion or contraction. Insulation shall not become wet before, during,
or after installation. Insulation installed over welds shall be grooved to
assure a snug fit. Insulation shall be held in place with stainless steel
straps. A minimum of 2 bands shall be installed on each individual length
of insulation and maximum spacing shall not exceed 450 mm 18 inch centers.
3.4.1
Installation
Material shall be installed in accordance with published installation
instructions of the manufacturer. Insulation materials shall not be
applied until piping tests are completed. Prior to application, surfaces
shall be thoroughly cleaned of moisture, grease, dirt, rust, and scale, and
painted where required.
3.4.2
Insulation on Pipes Passing Through Sleeves
Insulation shall be continuous, as required by paragraph Pipe Sleeves
Through Valve Manhole Cover. Aluminum jackets shall be provided over the
insulation. When penetrating valve manhole walls, aluminum jacket shall
extend not less than 50 mm 2 inches beyond the sleeve on each side of the
wall and shall be secured with an aluminum band on each side of the wall.
Where flashing is provided, the jacket shall be secured with not less than
one band located not more than 25 mm 1 inch from the end of the jacket.
When penetrating valve manhole tops, pipe shall be insulated as required
for valve manhole service as indicated.
3.4.3
Covering of Insulation in Valve Manholes
The insulation for pipe, flanges, valves, and fittings shall be covered
with [aluminum] [galvanized steel] jackets.
3.4.4
Insulation of Piping Accessories in Valve Manholes
Flanges, couplings, unions, valves, fittings, and other pipe accessories,
unless otherwise shown or approved, shall be insulated with removable and
reusable factory premolded, prefabricated, or field fabricated insulation.
For accessories in valve manholes, [aluminum] [galvanized steel] sheet
shall be applied over the insulation. Where accessories are designated not
to be insulated, the adjoining insulation and jacket shall terminate
neatly. The terminations for the chilled water systems shall provide a
complete vapor seal.
SECTION 02560
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