shall be thoroughly cleaned.
3.2.2
Workmanship and Defects
Piping, tubing and fittings shall be clear and free of cutting burrs and
defects in structure or threading and shall be thoroughly brushed and
chip-and scale-blown. Defects in piping, tubing or fittings shall not be
repaired. When defective piping, tubing, or fittings are located in a
system, the defective material shall be replaced.
3.3
PROTECTIVE COVERING
3.3.1
Underground Metallic Pipe
Buried metallic piping shall be protected from corrosion with protective
coatings as specified in Section 02556A GAS DISTRIBUTION SYSTEM. When
dissimilar metals are joined underground, gastight insulating fittings
shall be used.
3.3.2
Aboveground Metallic Piping Systems
**************************************************************************
NOTE: This paragraph applies to normal interior and
exterior conditions. Where severe corrosion is
expected, paragraph should be edited to provide for
protection against corrosion.
**************************************************************************
3.3.2.1
Ferrous Surfaces
Shop primed surfaces shall be touched up with ferrous metal primer.
Surfaces that have not been shop primed shall be solvent cleaned. Surfaces
that contain loose rust, loose mill scale and other foreign substances
shall be [mechanically cleaned by power wire brushing] [or] [commercial
sand blasted conforming to SSPC SP 6] and primed with [ferrous metal
primer] [or] [vinyl type wash coat]. Primed surface shall be finished with
two coats of exterior [oil paint] [or] [vinyl paint].
3.3.2.2
Nonferrous Surfaces
Except for aluminum alloy pipe, nonferrous surfaces shall not be painted.
Surfaces of aluminum alloy pipe and fittings shall be painted to protect
against external corrosion where they contact masonry, plaster, insulation,
or are subject to repeated wettings by such liquids as water, detergents or
sewage. The surfaces shall be solvent-cleaned and treated with vinyl type
wash coat. A first coat of aluminum paint and a second coat of alkyd gloss
enamel or silicone alkyd copolymer enamel shall be applied.
3.4
INSTALLATION
**************************************************************************
NOTE: If underground piping is subject to physical
damage, deeper burial depths should be specified to
protect piping.
**************************************************************************
Installation of the gas system shall be in conformance with the
manufacturer's recommendations and applicable provisions of NFPA 54, AGA
XR0104, and as indicated. Pipe cutting shall be done without damage to the
SECTION 15190A
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