2.1.2
Digester Gas Pipe and Fittings
2.1.2.1
Digester Gas Pipe Smaller Than 100 mm 4 Inch Diameter
Pipe shall be screwed joints galvanized steel in accordance with ASTM A
53/A 53M. Fittings shall be galvanized malleable iron in accordance with
ASME B16.3. Couplings shall be in accordance with ASTM A 53/A 53M.
2.1.2.2
Digester Gas Pipe 100 mm 4 Inch Diameter and Larger
Pipe shall be ductile iron in accordance with AWWA C115. Joints shall be
ASME B16.1, Class 125 flanged joints. Fittings shall be ductile iron in
accordance with AWWA C110. Bolts and nuts shall be in accordance with ASTM
A 307, Grade B.
2.1.3
Sludge Piping
Pipe shall be flanged ductile iron pipe in accordance with AWWA C115. Pipe
100 mm 4 inch diameter and smaller shall be thickness Class 51. Pipe 150
mm 6 inch through 600 mm 24 inch diameter shall be thickness Class 50.
[Pipe 750 mm 30 inch diameter and larger shall be thickness Class 51].
Fittings shall be ductile iron in accordance with AWWA C110. Joints shall
be ASME B16.1 Class 125 flanged joints. Bolts and nuts shall be in
accordance with ASTM A 307, Grade B.
2.1.4
All Other Piping
Pipe shall be standard weight black steel pipe in accordance with ASTM A
53/A 53M. Pipe smaller than 100 mm 4 inch diameter shall have screwed
joints and malleable iron fittings in accordance with ASME B16.3. Pipe 100
mm 4 inch diameter and larger shall have class 150 flanged joints and
fittings in accordance with ASME B16.5.
2.1.5
Valves
2.1.5.1
Angle, Check and Globe Valves
Valves shall conform to MSS SP-80, Type 3, globe and angle.
2.1.5.2
Valves shall conform to MSS SP-80, Type 1, Class 150 or MSS SP-70, Type I,
Class 150 bronze trim.
2.1.5.3
Plug Valves
Bronze plug valves shall comply with MSS SP-78.
Iron plug valves shall
comply with API Spec 6D.
2.1.5.4
Gas Valves
Shut-off valves on gas lines shall be of the cast brass plug-cock type for
sizes up to and including 50 mm 2 inch diameter and of the cast iron brass
mounted or wholly brass plug-cock type for sizes 65 mm 2-1/2 inch diameter
and larger. All gas line valves shall be in accordance with the applicable
requirements of ANSI Z21.15. Gas valves shall be tested with air at 861.8
kPa 125 psiwithout developing leakage.
SECTION 11380
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