NOTE: Not allowed for LANTNAVFACENGCOM projects.
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2.1.4.1
Concrete Pressure Pipe and Fittings
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NOTE: Delete reference to AWWA C302 within brackets
when pressure rating greater than 310 kPa (45 psi)
is required.
It may be necessary to modify chemical requirements
for cement under certain conditions. Sulfate
resistance is required for concrete pipe when pipe
is carrying sulfate-bearing waters, or when pipe is
buried in soil containing sulfates. Specify Type II
(moderate sulfate resisting) cement when
water-soluble sulfates (as S04) in the soil are in
the range of 0.1 to 0.2 percent and, for water, are
in the range of 150 to 1000 parts per million.
Specify Type V (sulfate resisting) cement when soils
contain in excess of 0.2 percent water-soluble
sulfate and water samples contain in excess of 1000
parts per million. In areas where reactive
aggregates are known to occur, specify low alkali
cement.
For concrete pressure piping, ASTM C 361M (ASTM C
361) covers pipe for up to 37.5 m (125 feet) of
hydrostatic head, approximately 379 kPa (55 psi);
AWWA C302 covers pipe and fittings for 310 kPa (45
psi) pressure rating, 30 m (100 feet) of
hydro-static head) only. ASTM C 361M (ASTM C 361)
contains tables giving design requirements for pipe
in all combinations of 30 and 37.5 m (100 and 125
feet) of hydrostatic head with 1.5, 3.0, 4.5, 6.0 m
(5, 10, 15, and 20 feet) of earth cover. Where
higher pressure ratings are necessary, piping
conforming to AWWA C300, C301, or C303 should be
specified.
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Pipe shall conform to [AWWA C302 or to] ASTM C 361M ASTM C 361. Pipe shall
be designed for hydrostatic head of [30] [38] m [100] [125] feet and
external loading of [1.5] [3.0] [4.5] [6.0] m [5] [10] [15] [20] feet of
earth cover. Circular pipe with elliptical reinforcement shall have a
readily visible line at least 300 mm 12 inches long painted or otherwise
applied on the inside and outside of the pipe at each end so that when the
pipe is laid in the proper position, the line will be at the center of the
top of the pipe. [Cement used in manufacturing pipe and fittings shall be
[Type II] [Type V] [low alkali cement] conforming to ASTM C 150.] Fittings
shall conform to AWWA C302.
2.1.4.2
Jointing Materials for Concrete Pressure Piping
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NOTE: Use first bracketed wording when pressure
rating greater than 310 kPa (45 psi) is not
required. Use second bracketed wording when
pressure rating greater than 310 kPa (45 psi) is
SECTION 02531
Page 19
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