NOTE: Specify secondary containment for piping when
required by state, regional, or local laws,
regulations, statutes, etc.
**************************************************************************
Provide [boxed-in trench] [double-walled piping] secondary containment
system for underground piping to completely contain the carrier piping from
the tank, including swing joints, to [within 150 mm 6 inches of interior
point of connection] [150 mm6 inches aboveground]. Secondary containment
shall allow for complete inspection of carrier pipe connections, during
carrier pipe hydrostatic testing, before the secondary containment system
is sealed. When steel pipe is provided as the secondary containment,
provide protection as specified in paragraph entitled "Protective Coating
Systems for Underground Steel Piping." The secondary containment system
for underground piping shall be:
a.
Compatible with No. [_____] fuel oil.
b.
Non-corrosive, di-electric, non-degradable and resistant to attack
from microbial growth.
c.
Designed and made of materials which have sufficient strength to
withstand the maximum underground burial loads. [Double-walled
outer piping shall be able to withstand H2O loading and a minimum
34 kPa 5 pounds per square inch air pressure test. Prefabricated
joints shall be 100 percent air tested at factory.]
2.1.7
Piping Accessories
2.1.7.1
Flexible Hose
Flexible metal hose, corrugated type with braided wire sheath covering,
close-pitch annular corrugations, rated for a working pressure of at least
862 kPa (gage), 200 mm 125 psig, 8 inch minimum live length, [flanged]
[screwed] end connections, UL listed for flammable liquid service. Metal
for hose and braided wire sheath shall be stainless steel, any type of ASTM
300-series.
2.1.7.2
Unions
ASME B16.39, Class [150] [250] pound.
a.
Dielectric Unions: Union comprised of steel female pipe thread
end and copper solder-joint end conforming to dimensional,
strength, and pressure requirements of ASME B16.39, Class 1.
Steel parts shall be galvanized or plated. Union shall have a
water-impervious insulation barrier capable of limiting galvanic
current to one percent of the short-circuit current in a
corresponding bimetallic joint. When dry, it shall be able to
withstand a 600-volt breakdown test.
2.1.7.3
Welding Filler Metal
ASME B31.4 and compatible with the materials to be welded.
2.1.7.4
Brazing Filler Metal
AWS A5.8, silver base alloy, with melting point not less than 593 degrees C
1100 degrees F.
SECTION 15192N
Page 14
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