Kan. Admin. Regs. § 49-50-8 - Piping system
(a) Piping
connected to the outlet of a boiler shall be attached by one of the following
methods:
(1) Screwing into a tapped opening
with a screwed fitting or a valve at the other end;
(2) screwing each end into tapered flanges,
fittings, or valves with or without rolling or peening;
(3) bolted joints, including those of the van
stone type; or
(4) expanding into
grooved holes, seal welded, if desired.
(b) Pipe that is expanded, rolled, or peened
shall be made from open-hearth or electric-furnace steel. Blowoff piping of
fire-tube boilers that is exposed to products of combustion shall be attached
by the method in paragraph (a)(1). The attachment methods in paragraphs (a)(2),
(3), or (4) may be used for blowoff piping of fire-tube boilers that is not
exposed to combustion products. Fusion welding may be used for sealing purposes
at the junction of bolted joints.
(c) Welding may be used to attach piping to
nozzles or fittings if the rules adopted for fusion welding or forge welding at
K.A.R. 49-50-1(b)(1) are followed. All welded piping that is external to the
boiler, from the boiler out to the first stop valve, in a single installation,
and out to the second stop valve when two or more boilers with manholes are
connected to a common steam or high temperature water main or header, shall be
installed by a manufacturer or contractor authorized to use any one of the
American society of mechanical engineers code symbol stamps for pressure piping
("PP"), power boilers ("S"), or assembly stamp ("A"). The piping or fittings
that are adjacent to the welded joint farthest from the boiler shall be stamped
with the pressure piping, power boiler, or assembly code symbol stamp of the
American society of mechanical engineers when approved by the inspector.
(d) Power boiler piping shall be
inspected in all segments of the system carrying substantially the same
pressures and temperature encountered in the boiler. The piping shall be
inspected to the extent necessary to assure compliance with engineering design,
material specifications, fabrication, assembly, and test requirements of
section I of the ASME boiler and pressure vessel code, "rules for construction
of power boilers," for the piping between the boiler and the first stop valve
in a single boiler installation, or the second stop valve in a multiple boiler
installation. Power piping and piping beyond these limits shall be installed as
required by the appropriate section of ASME B31.1 power piping.
(e) When welded assembly is used, the
contractor who welded the pipe shall present welding procedure specification
and proof of the welder's qualifications to the inspector for review. The
contractor shall be responsible for the quality of the welding performed by the
contractor's organization.
(f)
Visual inspection of welding performed by qualified welders shall be deemed
sufficient unless codes or engineering specifications state otherwise or unless
the inspector wishes to augment this visual inspection with other
non-destructive tests, including radiography. All tests or retests required by
the inspector shall be at the owner's or contractor's expense.
(g) Signed certification of the contractor
regarding satisfactory hydrostatic tests performed on piping may be accepted by
the inspector. These tests may be required by the inspector to be performed in
the inspector's presence.
(h)
Heating boiler piping shall be inspected in all segments of the piping system
carrying substantially the same pressure and temperatures as the boiler. The
piping shall be inspected to the extent necessary to insure good fit-up,
assembly, tightness, and support of the system. Welded joints shall be visually
inspected for soundness of the weld and freedom from undercutting, cracking,
and other surface imperfections. All inspections of piping shall be conducted
to the first stop valve on a single boiler installation or the second stop
valve in a multiple boiler installation.
(i) Hot water supply boiler installations
shall be inspected for conformance with section IV of the ASME heating boiler
code.
Notes
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