EXHIBIT D
CITY OF NASHUA
Technical Specifications for Water Valve and Yard Hydrant Installation
General: These specifications are not necessarily inclusive of all the work being done. The
contractor shall submit shop drawings of all yard hydrants and valves, water main valves, piping
and all fittings to be used prior to starting any work.
1. Ductile Iron Pipe for Service Connection to Existing Pipe
A. New ductile iron water pipe is to be used from where the existing service line pipe is cut
to the location of the new yard hydrant being installed. All ductile iron pipe shall
conform to AWWA Standard C151.
B. If ductile iron pipe is not available for the service line pipe size, the contractor shall
submit a shop drawing of the pipe to be used. No PVC, plastic or copper pipe is
permitted.
C. The pipe shall have an exterior epoxy coating on it to prevent corrosion.
D. Contractor shall determine appropriate connection fitting from the existing pipe to new
ductile or iron pipe. All fittings shall be durable ductile iron or iron, epoxy coated and be
a megalug or other mechanical joint to firmly connect the two pipes.
2. Water Main Gate Valves
A. Water main gate valves for the 6-inch, 10-inch and 12-inch size shall be live tap valves
equal to Hydra-Stop Insta-Valve 250 Patriot Series.
B. Traditional line tapping methods shall be used for the Installation of all Insertion Valves
to allow removal of a single coupon for system evaluation. Reaming the pipe, complete
removal of a section of pipe (top & bottom), or milling a slot in the pipe shall be
prohibited.
C. All insertion valves must be capable of working on Cast/Grey Iron or Ductile Iron Class
A, B, C and D, IPS PVC, C900 and C909 PVC, Steel and AC pipe diameters without
changing either top or bottom portion of split valve body or using a transition gasket.
D. All insertion valves must provide a solid support of the host pipe through the entire
laying length of the valve body. No gaps or space between the valve body and host pipe
shall be accepted.
E. All insertion valves shall be rated for 250 psig maximum working pressure. The pressure
rating must be permanently marked into the body.
F. All insertion valves must be hydrostatically pressure tested to 1.25 times of the system
operating pressure (minimum) or 1.5 times of the Insertion Valves 250 psig maximum
pressure rating. The test shall be sustained for a minimum of 15 minutes. Once the
pressure test is affectively achieved the insertion valve body must not be moved in
accordance with AWWA Standards. If the insertion valve body is moved the pressure test
