and Helical Corrugations for LANTNAVFACENGCOM
projects.
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ASTM A 760/A 760M, zinc or aluminum (Type 2) coated
pipe of either:
a.
Type [I] [II] pipe with [annular] [helical] 68 by 13 mm 2-2/3 by
1/2 inch corrugations.
b.
Type [IR] [IIR] pipe with helical 19 by 19 by 190 mm 3/4 by 3/4 by
7-1/2 inch corrugations.
2.1.3.1
Fully Bituminous Coated
AASHTO M 190 Type A and ASTM A 760/A 760M zinc or aluminum (Type 2) coated
pipe of either:
a.
Type [I] [II] pipe with [annular] [helical] 68 by 13 mm 2-2/3 by
1/2 inch corrugations.
b.
Type [IR] [IIR] pipe with helical 19 by 19 by 190 mm 3/4 by 3/4 by
7-1/2 inch corrugations.
2.1.3.2
Half Bituminous Coated, Part Paved
AASHTO M 190 Type B and ASTM A 760/A 760M zinc or aluminum (Type 2) coated
Type [I] [II] pipe with [annular] [helical] 68 by 13 mm 2-2/3 by 1/2 inch
corrugations.
2.1.3.3
Fully Bituminous Coated, Part Paved
AASHTO M 190 Type C and ASTM A 760/A 760M zinc or aluminum (Type 2) coated
Type [I] [II] pipe with [annular] [helical] 68 by 13 mm 2-2/3 by 1/2 inch
corrugations.
2.1.3.4
Fully Bituminous Coated, Fully Paved
AASHTO M 190 Type D and ASTM A 760/A 760M zinc or aluminum (Type 2) coated
Type [I] [II] pipe with [annular] [helical] 68 by 13 mm 2-2/3 by 1/2 inch
corrugations.
2.1.3.5
Concrete-Lined
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NOTE: Concrete-lined corrugated metal pipe combines
the structural economy of corrugated metal pipe with
the hydraulic efficiency of a concrete lining to
provide an alternative to reinforced concrete pipe.
Smooth-lined corrugated pipe and pipe arch will not
be given hydraulic credit for the lining unless it
can be demonstrated that the lining will last for
the full service life of the project. If the lining
will last for the full service life, use the same
"n" value as for concrete pipe. If the lining will
not last the full service life, use the "n" value
for uncoated corrugated pipe or pipe arch.
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SECTION 02630
Page 17
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