A.
This standard is intended as a guide to minimum good
practices in the installation of cast-iron water mains and fittings and is
based on Standard C 600-64 of the American Water Works Association. For specific
projects, a thorough review of the application of the standard is anticipated
in conjunction with the engineering review process of the Planning Board of
the Town of Somers, and specific construction details may then be required
of developers to provide a well-designed and -constructed water system. It
is anticipated that minor further modifications may also be directed to respond
to field conditions when construction is under way.
B.
The pipe selected shall be manufactured in accordance
with the provisions of the American Water Works Association Standard C 106-62,
American Standard for Cast-Iron Pipe Centrifugally Cast in Metal Molds, for
Water or other Liquids, American Water Works Association Standard C 108-62,
Cast-Iron Pipe in Sand Molds.
A.
Joint design. Joints shall conform to the American Water
Works Association Standard C 112-65, American Standard for Rubber-Gasket Joints
for Cast-Iron Pressure Pipe and Fittings. Mechanical joints may be substituted,
subject to approval of the Engineer as to type and detail thereof. Caulked
or cemented joints will not be permitted.
B.
Direction of joint. Pipe shall be laid with bell ends
facing in the direction of laying, unless directed otherwise by the Engineer.
Where pipe is laid on a grade of 10% or greater, the laying shall start at
the bottom and shall proceed upward with the bell ends of the pipe up grade.
C.
Cutting of pipe.
(1)
The cutting of pipe for inserting valves, fittings or
closure pieces shall be done in a neat and workmanlike manner, without damage
to the pipe or cement lining and so as to leave a smooth beveled end at right
angles to the axis of the pipe and free from burrs.
(2)
Flame cutting of pipe by means of an oxyacetylene torch
shall not be allowed.
D.
Variations in dimensions. There is only one nominal dimension
of the spigot outside diameter and the socket inside diameter for each size
of push-on-joint pipe. Similar dimensions of the caulked-joint bell-and-spigot
pipe may vary with the class pipe for each size in existing lines. Therefore,
care should be taken that the outside diameter of the existing line is the
same as the outside diameter of the push-on-joint pipe being installed, otherwise
a special adapter to join the two lines may be necessary.
E.
Cleaning and assembly of joint.
(1)
The inside of the bell and the outside of the spigot
end shall be thoroughly cleaned to remove oil, grit, excess coating and other
foreign matter. The circular rubber gasket shall be flexed inward and inserted
in the gasket recess of the bell socket.
(2)
A thin film of gasket lubricant shall be applied to either
the inside surface of the gasket or the spigot end of the pipe, or both. Gasket
lubricant shall be supplied by the pipe manufacturer and approved by the Engineer.
(3)
The spigot end of the pipe shall be entered into the
socket with care used to keep the joint from contacting the ground. The joint
shall then be completed by forcing the plain end to the bottom of the socket
with a forked tool or jack-type tool or other device approved by the Engineer.
Pipe that is not furnished with a depth mark shall be marked before assembly
to assure that the spigot end is inserted to the full depth of the joint.
Field-cut pipe lengths shall be filed or ground to resemble the spigot end
of such pipe as manufactured.
F.
Permissible deflection at joint. Where necessary to conform
to vertical or horizontal curvature, a deflection not to exceed one inch per
foot at any joint may be permitted by the Engineer.
The provisions of § A173-21 shall apply, except that Item 2EF-B graded material will be required to be backfilled to only six inches above the top outside of the pipe and to a compacted depth of four inches below the bottom outside of the pipe.
