Bulletin PP 310 / February 2019 Page 16 2019 Chevron Phillips Chemical Company LP
Performance Pipe, a division of Chevron Phillips Chemical Company LP | 5085 W. Park Blvd | Suite 500 | Plano, TX 75093 | Phone: 800-527-0662
Propane (LPG) Gas Service
The Office of Pipeline Safety Advisory Bulletin No. 73-4, dated April 1973, states, "It is the operator's
responsibility to assure the integrity of the plastic pipe selected for use in the piping system, and this should
be based on a favorable recommendation from the manufacturer. Therefore, the Federal minimum safety
standards do permit the use of plastic in a properly engineered underground system of LPG distribution
conforming to the limitations of these regulations." Driscoplex
®
6500 pipe (PE2708), Driscopipe® 8100 pipe
(PE4710) and Yellowstripe
®
8300 pipe (PE4710) series products meet the requirements of ANSI/NFPA 58
Standard for the Storage and Handling of Liquefied Petroleum Gases.
The Plastics Pipe Institute has made the following "Use Recommendation" for polyethylene piping systems
for commercial propane systems (PPI Technical Report TR-22):
The information collected indicates that polyethylene plastic piping is satisfactory for transporting LPG and its
major component, propane gas. This information also indicates that pressure design parameters based on
propane gas should be adequate and reasonable. However, until more information is available, these use
recommendations cover only commercial propane vapor in detail.
1. The polyethylene plastic pipe, tubing and fittings should be only those specific types designated as
PE2708 or PE4710 and meeting the appropriate requirements of ASTM D2513.
2. A Hydrostatic Design Basis of 1000 psi should be used in the design of polyethylene pipe systems for
propane gas distribution at pipe temperatures of 73°F or lower. The long-term hydro static strength
measurements should be made in accordance with ASTM D2837.
3. Polyethylene should be used only in underground propane gas distribution systems designed to
operate at internal pressures and temperatures such that condensation will not occur.
It is also recommended that operating pressures be limited to 30 psig or less.
In cases where condensation does occur in a propane system or propane enriched system and the presence
of condensation is of relatively short duration, there is no indication of loss of physical integrity or observable
change in polyethylene pipe. Under actual operating conditions, in a properly designed system, the pressures
and temperatures are such that revaporization of any propane condensates will usually occur. Experience
with propane liquids in polyethylene shows that there is no cumulative effect of intermittent, short duration
exposure of propane condensate in polyethylene. For additional information, see PPI Technical Report TR-
22. Exposure to liquefied propane condensates for extended periods may affect joining.
Mercaptans
Mercaptans are a group of organic compounds containing a Sulfur-Hydrogen bond that have a distinct odor
in small concentrations. Natural gas is an odorless hydrocarbon. Natural gas carriers and distributors add
mercaptans to natural gas to warn of leaks and to alert the presence of natural gas atmospheres. New plastic
pipes have the tendency to absorb mercaptans, causing the odor to fade or become faint. The effect is not
long term and after a period of time the distinctive odor of mercaptan is readily detected when released.
Mercaptan enriched natural gas has the possibility of inducing a phenomenon known as “odor fatigue.” The
condition can cause nasal passages to become saturated with the smell of gas over time, making it difficult
to continue to detect the mercaptan odor.