concrete regardless of material used for interior
walls or partitions. Steel plants are considered as
plants having outer walls of steel and bottom of
steel or concrete (except that all-steel would be
needed for relocatable plants).
**************************************************************************
Inlet piping shall be of steel shall be welded to aeration tank wall of
steel plant. It shall have a flanged 862 kPa 125 psi ASME B16.1 connection
to incoming sewer line. [Inlet piping for concrete aeration tanks shall be
provided in sleeve in wall and connected to incoming sewer by means of a
grout ring]. Tank drain or dewatering piping shall be black steel or cast
iron. Gate valves or shear gates shall be provided for tank drain or
dewatering piping.
2.11.2
Piping System Materials
2.11.2.1
Steel Piping
Steel pipe for sizes 100 mm 4 inch diameter and smaller shall be standard
weight zinc-coated steel pipe conforming to ASTM A 53, with fittings of
cast iron conforming to ASME B16.4, Type II. Steel pipe for sizes 125 mm 5
inch diameter and larger shall be seamless or electric-resistance welded,
standard-weight, black steel pipe conforming to ASTM A 53, Grade B. Joints
for pipes sizes 50 mm 2 inchdiameter and smaller shall be screwed joints.
Joints for pipe sizes 63 mm 2 1/2 inch through 100 mm 4 inch diameter shall
be screwed or flanged. Flanges shall conform to, ASME B16.5, or AWWA C207.
Bolts and nuts for flanged connections shall conform to the requirements
specified in AWWA C207. Gaskets shall be plain rubber gaskets 3 mm 1/8 inch
thick.
2.11.2.2
Cast Iron Piping
Cast iron piping shall be standard commercial grade cast iron pressure pipe
and fittings shall be suitable for the purpose.
2.11.2.3
Valves
a.
Gate Valves: Gate valves 50 mm 2 inches and smaller shall have
threaded ends and shall conform to MSS SP-80; gate valves 63 mm
and 75 mm 2 1/2 and 3 inches in size shall have flanged ends and
shall conform to MSS SP-70 or MSS SP-80; gate valves 100 mm 4
inches and larger shall have flanged ends and shall conform to MSS
SP-70. Valves shall be rising stem or outside screw and yoke
type. Valves for air service and froth control system shall be
wedge or double disc type. Valves for sludge service shall be
solid wedge type.
b.
Globe valves shall conform to MSS SP-80.
c.
Plug Valves: Plug valves shall be lubricated, regular pattern
type conforming to MSS SP-78 or eccentric plug type conforming to
the applicable requirements of MSS SP-78.
d.
Ball valves shall conform to MSS SP-72.
**************************************************************************
NOTE: Delete reference to concrete wall in first
sentence when steel plant only is required.
SECTION 11375N
Page 61
Previous Page
