NOTE: If expansion joints are not required, this
paragraphs will be deleted. Where space limitations
prevent such provisions for expansion, expansion
joints will be installed, and blanks will be filled
as appropriate.
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Expansion joints shall provide for either single or double slip of the
connected pipes, as required and indicated. Initial setting shall be made
in accordance with the manufacturer's recommendations to allow for 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 in lines 100 mm
4 inches or smaller where guides shall be installed not more than 600 mm 2
feet from the joint.
3.4.6
Valves
Gate or globe valves shall be installed with stems horizontal or upright.
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 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
All 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. All field joints shall be coated and wrapped by hand.
All 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:
3.5.3.1
Bituminous Pipe Coating
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SECTION 15559A
Page 103
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