2.1.6
Expansion Joints
Expansion joints shall conform to EJMA Stds.
2.1.7
Pipe Hangers and Supports
Pipe hangers and supports shall conform to MSS SP-58 and MSS SP-69.
2.1.8
Motors shall conform to NEMA MG 1.
2.1.9
Motor Controls and Motor Control Centers
Controls and motor control centers shall conform to NEMA ICS 1, NEMA ICS 2,
NEMA ICS 3, NEMA ICS 4, NEMA ICS 6, UL 508, and UL 845.
2.2
DIGESTER GAS HANDLING SYSTEM
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NOTE: Coordinate with Section 13234A FLOATING COVER
FOR SLUDGE-DIGESTION TANKS. Coordinate with
paragraph COMPRESSED GAS SLUDGE MIXING SYSTEM.
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A complete system shall be provided for distribution and disposal of gas
produced in the digesters. The system shall include all necessary gas
safety equipment to insure maximum protection against fire, explosion, and
fume hazard at all times. Gas equipment shall be designed for digester gas
having a calorific value of 22.3 MJ per cubic meter (600 Btu per cubic
foot) 600 Btu per cubic foot, a specific gravity of 0.8, and a maximum
pressure of [_____] Pa inches water column. The system shall provide
distribution to the [compressed gas sludge mixing system,] and [gas storage
tank,] sludge heating system and waste gas burner.
2.2.1
Waste Gas Burner
Waste gas burners, having a capacity for burning [_____] cubic meters cubic
feet of gas per hour at a pressure loss not to exceed 127 Pa 1/2 inch of
water column, shall be provided to dispose of excess digester gas. The
burner shall be provided with a [_____] mm inch screwed inlet and a
pilot-line connection not less than 20 mm 3/4 inch in diameter. The burner
shall be provided with a readily adjustable pilot light, properly designed
air inlet and mixing chamber, a burner bowl supported by a cast iron or
steel pipe pedestal filled with insulating material, and a flanged base
with anchor bolts for installation on a concrete foundation or concrete
curb. The pilot light and burner shall be arranged to prevent the pilot
light from being blown out by gas ignition, wind, or other accidental
means. A shut-off valve shall be provided in the pilot gas line. The
waste gas burner shall be located a minimum of 15 m 50 feet from the [gas
storage tank] [and] [digester].
2.2.2
Flame Checks
Flame checks shall be provided in the pilot line to the waste gas burner.
Flame checks shall block flame return and shall have threaded end
connections of the same size as the pilot line.
SECTION 11380
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