temperature shifts, bending, internal pressure, direct burial, point loading, and squeeze-off. Multiple tests confirm its consistent performance under these conditions. Our 3810 and 4810 pipe is available in diameters from 1/2" to 6" coiled and 1/2" to 24" straight lengths.

Design Pressure Rating

The pressure rating of PoIyPipe is determined in accordance with the PPI recommended hydrostatic design basis for the material, the physical dimensions of the pipe, and the appropriate design and service factors. Pressure design calculations are based on the following formula which relates the stress on the pipe wall. to internal pressure.

P = 2S x DF x F
(SDR - 1)


Where:
S = long-term hydrostatic strength, (psi)
(1600 psi for 4810, 1250psi for 3810)
P = internal pressure, (psi)
SDR = standard dimension ratio, (D/t)
D = outside diameter, (inch)
t = minimum wall thickness, (inch)
DF= design factor, (0.32)
F = service factor, (if needed)
Consult PolyPipe Design and Engineering Guide for further information.

Thermal Expansion

Polyethylene, like other plastics, has a thermal expansion coefficient higher than metals. The value for polyethylene is about
1.0 x 10-4 in/in/ degrees F. Consequently, allowance for thermal expansion and contraction in service should be made during installation of the pipe. A general rule is one inch change in length per 100 feet of pipe per 10 degrees F change in temperature. In short runs, changes in direction of the pipeline will often give sufficient allowance for stresses arising from changes in temperature.
POLYPIPE™: TOTAL PERFORMANCE, TOTAL SOLUTIONS.
A reliable gas distribution system requires strength, integrity and uncompromising reliability. Not only from your pipe, but also from your pipe supplier.

These qualities make PolyPipe the smart choice for gas distribution applications. As one of the largest manufacturers of medium and high-density polyethylene pipe, we understand the critical need for consistent, dependable products. Our MDPE and HDPE pipe are manufactured to the highest quality standards in the industry. Our staff engineers and technical experts help assure you get maximum performance and value - from evaluation and design, through job-site assistance and testing. While our network of manufacturing and distribution centers, strategically located across the U.S., provide timely delivery The result is a total system solution for your gas distribution project.

A Proven Piping System

Our medium-density yellow 3810 PE2406 and our highdensity, black 4810 PE3408 pipe is specially designed and produced for natural gas distribution system applications. This pipe offers outstanding environmental stress crack resistance, as well as high chemical and impact resistance. PolyPipe is lightweight and coilable for easy installation and heat fusible for fully restrained leak-free joints. It exceeds all industry requirements according to ASTM.

D2513 and Title 49 CFR Part 92. Municipalities and contractors increasingly chose polyethylene pipe for gas systems use, due to its corrosion resistance, weatherability, strength and easy handling characteristics. PolyPipe PE pipe provides long-term resistance to a variety of stress conditions, including abrasion,

• Typical Physical Properties