2010 Construction and Material Specifications - Ohio Department of ...

638.10
where:
ND P
ND P
L = L =
7400
130000
L = allowable leakage, in gallons (L) per hour
N = number of joints in the length of pipe tested.
D = nominal diameter of the pipe, in inches (mm)
P = average test pressure during the leakage test, in pounds per
square inch (kPa)
638.10 Disinfection of Completed Water Work. After passing the
hydrostatic testing, disinfect the completed water work according to AWWA.
Make all necessary taps and furnish all equipment and labor required for the
disinfections. Obtain the Engineer’s approval of the time and the section of line to
be disinfected.
638.11 Steel Pipe Encasement. Furnish and install a steel casing of the
diameter and wall thickness shown in the plans.
Make any necessary excavation to install the steel casing. Obtain the
Engineer’s approval for the method of any boring or jacking operation. If placing
the steel casing in an open cut trench, place it according to 638.05 and 638.08.
Join the casing pipe together with a full-circumference weld conforming to
513.21.
Ensure that the inside diameter of the casing allows the water main to be
removed without disturbing the casing or roadbed. Ensure that the inside diameter
of the casing is at least 2 inches (50 mm) greater than the largest outside diameter
of the water main joints or couplings for carrier pipe that is less than 6 inches (150
mm). Ensure that the inside diameter is at least 4 inches (100 mm) greater than the
largest outside diameter for carrier pipe 6 inches (150 mm) in diameter and over.
Install the main in the casing on hardwood blocking or stainless steel chocks
designed to remain fixed in position. The Contractor may install polyvinyl
chloride water main using casing insulators. Close both ends of the casing with
mortared 4-inch (100 mm) bricks or a concrete bulkhead.
638.12 Polyethylene Encasement. Lay ductile iron pipe with a polyethylene
encasement as shown on the plans. Install pipe and polyethylene encasement
according to ANSI/AWWA. Any increased girth of wrapping over valves, tees,
and any other irregular shaped items are included in this item without any
additional payment.
638.13 Valves and Equipment. Upon delivery at the work site, open valves to
prevent the collection of water in the valve. Clean the interiors of valves of all
foreign matter, and inspect them in both the open and closed position before
installation.
Set valves plumb and joint them to the pipe according to 638.07 and the
ANSI/AWWA standards for the joint type used.
566