space prevent such provisions for expansion,
expansion joints will be installed and blank will be
filled as appropriate. Bracketed portion will be
deleted if inapplicable.
**************************************************************************
Expansion joints shall provide for either single or double slip of the
connected pipes, as required and indicated, and for not less than the
traverse indicated. Anchor bases or support bases shall be provided as
indicated or required. Initial setting shall be made in accordance with
the manufacturer's recommendation to allow for an ambient temperature at
time of installation. Pipe alignment guides shall be installed as
recommended by the joint manufacturer, but in any case shall not be more
than 1.5 m 5 feet from expansion joint, except that in lines 100 mm 4 inches
or smaller guides shall be installed not more than 600 mm 2 feet from the
joint.
3.4.6
Valves
Gate valves and globe valves shall be installed with the stem horizontal or
above. Swing check valves shall be installed in horizontal piping with the
cap or bonnet up, or in vertical piping with the flow upward. Lift or
piston check valves shall always be installed in horizontal piping with the
cap or bonnet up.
3.5
BURIED PIPING INSTALLATION
3.5.1
Protective Coating for Underground Steel Pipe
Steel pipe installed underground shall be given a protective covering,
mechanically applied in a factory or field plant especially equipped for
the purpose. Specials and other fittings which cannot be coated and
wrapped mechanically shall have the protective covering applied by hand,
preferably at the plant applying the covering to the pipe. Coatings shall
not be field applied until the piping has satisfactorily passed the leak or
hydrostatic test. Field joints shall be coated and wrapped by hand. Hand
coating and wrapping shall be done in a manner and with materials that will
produce a covering equal in effectiveness to that of the
mechanically-applied covering.
3.5.2
Cleaning of Surfaces to be Coated
Steel surfaces shall be solvent-washed to assure an oil-and-grease-free
surface, and blast-cleaned to bare metal as specified in SSPC SP 6. Areas
that cannot be cleaned by blasting shall be cleaned to bare metal by
powered wire brushing or other mechanical means. The air supply for
blasting shall be free from oil and moisture. Following cleaning, the
surfaces shall be wiped with coal-tar solvent naphtha and allowed to dry.
The surfaces to be coated shall be free of all mill scale and foreign
matter such as rust, dirt, grease, oil, and other deleterious substances.
Surfaces shall be coated as soon as practicable after the cleaning
operation.
3.5.3
Coating Materials
Buried steel piping shall be coated with one of the following methods:
SECTION 15555A
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