The Contract document of BP does not speak on hydrostatic testing. Engineer on site being in-experience on HDPE pipeline trying to maintain Quality pipe laying by verbal instructions, which is not based on logic or engineering requirement of material. Regarding butt fussion, all technical specification of "PERFORMANCE PIPE" has been copied from internet which is yet not been modified to the specific requirement of particular project. For instance, internal cleaning as per PP technical specification calls for cleaning which can be done blowing, where as Engineer wants to use Sphear for cleaning. Our plea is that cleaning cannot be done with Spherical PIG, it has to be done with polly PIG. Similarly Hydrostatic Test, according BP written Spec says 150% of system design pressure and maintain upto 8 hours, where as PERFORMANCE PIPE Specification copied from internet call for required pressure and maintain for 3 hours. It does not tell us to record on chart. We have been told verbally to pressure test the line @ 115 psig, use pressure and temperature recorder of lower range. Pressure and tempt recorder of lower range is not available in Pakistan. Please note that pipeline will buried during test. The only solution to this problem is athenticated Internation Standard.

I'm waiting your reply for PWSlack's inquiry.

I hope this water line is not for a public water supply. I know it is very cheap and it does not cost much either. Here in the the 16 states I have worked in HDPE is an unacceptable product for waterlines. However in some place it is used for private waterlines. The problem with it is that it is so soft that after about 6 to 10 years it develops holes from wearing against sand, gravel and rocks. This is because of water hammer.

I am surprised at your assessment of limited life expectancy for HDPE. One site I know of uses one 3 inch line as a suction for two 5 hp water pumps in parallel, and runs over rocks, some sections partly buried in sand, some exposed to intense sunlight, and a good section of the run under sea. In over ten years, there has been no indication of any potential for failure. Although this is a low-pressure application, the pipe is subjected to some pretty severe mechanical stresses, especially at the sea/land interface (no special attention to mitigating tidal variations or wave action. A second installation at the same site utilizes HDPE as a diesel fuel line, again running from shore to a floating platform, over uncontrolled terrain. Both installations are weighted with concrete collars to keep the pipe from floating to the surface. As ntoed, both installations are more than 10 years old (the actual age is unknown- my knowledge of the installations exceeds 10 years). I have also used HDPE as a temporary suction line for a seawater pump and watched it being whipped about by storm waves with no significant damage. The brand we are using is, I believe, called "FASLINE", or something similar, and is sourced in the United States. I also know from experience that PVC used in similar applications has a live expectancy of less than 6 months. In all cases, we are looking at low-pressure applications, and I do not have any information about solar heating of the exposed sections of the run, but I do know that HDPE is far more forgiving of sunlight exposure than conventional PVC.

Your comment came as a surprise to me, because I was working for a contractor some years ago, and we installed a 4 inch HDPE pipe system for gas distribution on a military base, all in accordance with the project's official and approved design plans.

I realize that there is no water hammer in a gas system, but if the HDPE is vulnerable to being holed thru because of frictional abrasion, I wonder about ground temperature variations on long runs causing the same problems. Any opinions?

Molefex

Contact information for Performance Pipe:

Performance Pipe
5085 W. Park Blvd., Suite 500
Plano, TX 75093
800.527.0662

www.driscoplex.com
Contact for your region is:

Rick Elliott
Telephone: 972-599-6615
Fax: 972-599-7328

If you can give full information on usage and conditions it would help us help you.

HIGH DENSITY POLYETHYLENE PIPE
Typical Physical Properties***

http://www.isco-pipe.com/products_services/hdpe_pipe_1phillips.asp

Property Specification Unit Nominal Value Material Designation PPI / ASTM PE 3408 Material Classification ASTM D-1248 III C 5 P34 Cell Classification ASTM D3350-99 345464C -Density (3) ASTM D-1505 gm/cm3 0.955 -Melt Index (4) ASTM D-1238 (216 kg/190¡C) gm/10 min. 0.11* -Flex Modulus (5) ASTM D-790 psi 135,000 -Tensile Strength (4) ASTM D-638 psi 3,200 PENT (6) ASTM F-1473 Hours >100 -HDB @73¡ F (4) ASTM D-2837 psi 1,600 -HDB @ 140 Deg F ASTM D-2837 psi 800 -U-V Stabilizer (C) ASTM D-1603 % C 2.5 Hardness ASTM D-2240 Shore "D" 65 Compressive Strength (yield) ASTM D-695 psi 1,600 Tensile Strength @ Yield
(Type IV Spec.) ASTM D-638 (2"/min.) psi 3,200 Elongation @ Yield ASTM D-638 %, minimum 8 Tensile Strength @ Break
(Type IV Spec.) ASTM D-638 psi 5,000 Elongation @ Break ASTM D-638 %, minimum 750 Modulus of Elasticity ASTM D-638 psi 130,000 PENT (6) ASTM F-1473 Hours >100 (Cond. A, B, C: Mold. Slab) ASTM D-1693 Fo, Hours >5,000 (Compressed Ring - pipe) ASTM F-1248 Fo, Hours >3,500 Slow Crack Growth Battelle Method Days to Failure >64 Impact Strength (IZOD) ASTM D-256 In-lb / in notch 42 (.125Ó Thick) (Method A) Linear Thermal Expansion Coef. ASTM D-696 in / in/¡F 1.2x10-4 Thermal Conductivity ASTM D-177 BTU-in/ft2/ hrs/ degreesF 2.7 Brittleness Temp. ASTM D-746 degrees F < -180 Vicat Soft. Temp. ASTM D-1525 degrees F 257 Heat Fusion Cond. ASTM D-1525 @ psi degrees F 75 @ 400

*** This list of typical physical properties is intended for basic characterization of the material and does not represent specific determinations of specifications. The physical properties values reported herein were determined on compression molded specimens prepared in accordance with Procedure C of ASTM D 1928 and may differ from specimens taken from pipe.
** Tests were discontinued because no failures and no indication of stress crackinitiation.
* Average Melt Index value with a standard deviation of 0.01

Download KWH Manual, there can you find tests requirements; e.g. pressure may decrease during test accoding to charts/table parameters.

Omar A. Samaniego

osamaniego@cosapi.com.pe

Dear Omer,

Please provide the address of this Maual you have mentioned.

I can send it by email, let me know your email

Regards

Omar

omar.samaniego@gmail.com

Hi.

Polyethylene pipe and fittings shall be manufactured from high density compounds in accordance with ASTM D3350. All HDPE pipe shall be closed profile and have a minimum SDR rating of 35 and a minimum pipe stiffness of 46 psi.

All pipe shall be provided with joints designed so that neither the outside diameter of the pipe is increased nor the internal diameter of the pipe is decreased at the joint.

4.4.5 Cellular concrete grout for annular space provided under this Specification shall have the following characteristics:

i.) 250 psi, 28-day compressive strength; 100 psi, 24-hour compressive strength, minimum.

ii.) Foam concentrate: ASTM C869.

iii.) Cement: ASTM C150.

iv.) Fly ash: ASTM C618, Class F, except loss of ignition shall not exceed 5%.

v.) Water: Potable.

vi.) Admixtures: Only as approved by foam concentrate manufacturer and ENGINEER.

4.4.6 All connectors provided for reinstatement of laterals shall be as follows:

i.) All connectors shall be composed of synthetic rubber based compounds formulated to resist acids, alkalis, solvents, and greases encountered in sanitary and storm sewer and shall contain no reclaimed rubber. CONTRACTOR shall submit evidence of satisfactory testing in accordance with ASTM D543 with no weight loss in 1.0N sulfuric acid, 1.0N hydrochloric acid or 1.0N nitric acid. Materials shall show no etching, blistering, distortion or other evidence of chemical attack. Ultimate tensile strength shall exceed 750 psi at 80 degrees F and elongation shall exceed 150%. Water absorption shall not exceed 4% when tested in accordance with ASTM D570 and hardness shall not exceed 55 in a 5 second reading interval when tested in accordance with ASTM D2240, Type A Hardness.

ii.) All compression bands shall be Series 316 Stainless Steel. All nuts and bolts shall be Series 305 Stainless Steel.

iii.) The completed joint shall comply with ASTM C425 for resilient sewer pipe joints.

SUBMITTALS

In addition to the requirements for submittals set forth in the City of Indianapolis General Conditions for Construction Contracts and the requirements for submittals contained in companion sections of these Technical Specifications, CONTRACTOR shall submit the following:

4.6.1 Manufacturer's literature for materials used in liner, gaskets and fittings.

4.6.2 Proposed grout mixture and pressures.

4.6.3 Test results and certification of compliance for materials.

4.6.4 Proposed plan for bypassing sewage during liner installation, if applicable.

4.6.5 Manufacturer's design analysis.

4.6.6 Proposed method of reconnecting service laterals, if applicable.

4.6.7 Details identifying proposed installation method, equipment, and location of access shaft, pit or approach tunnel.

TESTING AND ACCEPTANCE

CONTRACTOR shall employ an independent testing agency to conduct and report compressive strength testing of the grout utilized in the construction. CONTRACTOR shall prepare and submit for testing four cellular concrete cylinders from each day's grouting activities. Testing shall occur at 1 and 28 days. All test results shall be submitted to OWNER.

After all work is completed, CONTRACTOR shall provide OWNER with videotape showing both the pre- and post-installation conditions including the restored connections. Televising shall be accomplished in accordance with Technical Specification 1113-Closed Circuit Televising of Sewer Lines. All defects discovered during the post-installation television inspection shall be corrected by the CONTRACTOR at his expense before the work under the Contract will be considered for Substantial Completion. After the defects, if any, are corrected, the affected sewer segment(s) shall be video taped again. The post-installation television inspection tape shall be submitted to the ENGINEER in sufficient time to allow the ENGINEER to review the videotape prior to the Substantial Completion milestone.

Also check CSA Z662- 2007 edition, Chapter 13 - fully.