Agenda

D. Hydrostatic Pressure Testing

1.

2.
3.

8.

9.

Contractor shall use a hydrostatic test pump specifically designed for
performing hydrostatic pressure tests on pipe.

Clean potable water shall be used as the testing medium to fill the pipes.
Pipe shall be tested at 1.5 times the rated working pressure of the pipe or
the lowest rated pressure of any component of the system being tested.
In no case exceed maximum allowable pressure for any pipeline
component, including valves, fittings, and instruments.

3.3. PIPE TESTING

A. General

1.

2.

7

9.

The Contractor shall perform hydrostatic pressure tests after placement
in trench, in accordance with these specifications.

The total test time, including initial pressurization, initial expansion, and
time at test pressure shall not exceed eight hours. If the test is not
completed in eight hours, the pressure in the test section shall be
released and the section allowed to “relax” for at least eight hours before
initiating another test.

d. Tighten flange bolts using a torque wrench in sequence and
accordance with manufacturer’s recommendations. CAUTION: Do
not over-torque bolts. CONTRACTOR shall use a torque wrench to
tighten all flange fasteners.

Pull bolts down by degrees to uniform torque in accordance with

manufacturer's recommendation.

Protect below grade bolts and flanges by covering with a 6-mil thick PE

wrap. Duct tape wrap to HDPE pipe.

Electrofusion couplers, where used, shall be installed per manufacturer's

10.

11.

12.

Do not subject pipe to strains that will overstress or buckle piping or
impose excessive stress on joints.

Branch saddle fusions shall be joined in accordance with manufacturer’s
recommendations and procedures. Branch saddle fusion equipment shall
be of a size to facilitate saddle fusion within the trench.

Before butt fusing pipe, inspect each length for presence of dirt, sand,
mud, shavings, and other debris or animals. Remove debris from pipe.

Cover open ends of fused pipe at end of each working day. Cap to

G. The Drawings do not show all fittings that may be required. CONTRACTOR to
provide all fittings required for a complete installation.

PART 3 ~- EXECUTION

3.1 FIELD QUALITY CONTROL

A. Pipe may be rejected for failure to conform to any of the following:

1.

Uo we

completed within 2 to 5 minutes. Remove the load, and examine the
specimens for splitting cracking or breaking.

2. Pipe Ring Stiffness Constant: The pipe ring stiffness constant shall be
determined using procedures similar to those outlined in ASTM D2412.
The stiffness of HDPE pipe is defined in terms of the load, applied
between parallel plates, which causes 1 percent reduction of pipe
diameter. Test specimens shall be a minimum of two pipe diameters or 4
feet in length, whichever is less.

2.4 GASKETS AND HARDWARE

2.3

e. Production Code, including Extrusion Date, and Lot or Batch
Number; and
f. SDR.

SOURCE QUALITY CONTROL

A.

The pipe and fitting manufacturer shall certify that samples of his production
pipe have undergone stress regression testing, evaluation, and validation in
accordance with ASTM D2837 and PPI TR-3. Under these procedures, the
minimum hydrostatic design basis shall be certified by the pipe and fitting
manufacturer to be 1600 psi at 73.4°F and 800 psi at 140°F.

E. Clean rework or recycled material generated by the manufacturer’s own
production may be used so long as the pipe or fittings produced meet all the
requirements of this Section.

2.2 PIPEAND FITTINGS

A. Dimensions

1. The nominal inside diameter of the pipe shall be true to the specified pipe
size in accordance with ASTM D2513. Standard laying lengths shall be 40
feet + 2 inches.

2. Fittings such as couplings, wyes, tees, adaptors, etc. for use in laying pipe
shall have standard dimensions that conform to ASTM D2513.

C. Pipe Handling

1. Protect pipe from excessive heat or harmful chemicals.
2. Handle pipe and use equipment needed to avoid gouging of the pipe

surfaces.

PART 2 - PRODUCTS

PHYSICAL PROPERTIES

A. Materials used for the manufacture of HDPE pipe and fittings shall meet the
following physical property requirements:

Property Unit Test Value
Procedure

C. QAtesting for representative pipe and fitting samples shall include:

Test Standard Pipe Fittings
Ring ESCR ASTM F1248 Yes Not Applicable
Sustained pressure at ASTM D1598 Yes Yes
176°F / 725 psi hoop stress (f0>100 h) (f0>100 h)
Sustained pressure at 73°F | ASTM D1598 Yes Yes
/ 1600 psi hoop stress (f0>1,000 h) (f0>1,000 h)