La. Admin. Code tit. 70 § II-519

Current through Register Vol. 50, No. 11, November 20, 2024

Section II-519 - Standards for the Installation of Plastic Pipe

A. General

1. All applicable general considerations, specific policies, and general standards listed elsewhere in this Chapter shall apply.

2. Where uncased crossings are permitted, the following general considerations shall apply.

a. New installations must provide at least 5 feet of cover below the roadway and 3 feet below ditches or drainage structures.

b. Repairs under the roadway will not be allowed if it necessitates open cutting the roadway. If trouble with the crossing is experienced, the utility company must install a new crossing at 100 percent their cost. Repairs are not allowed within control of access areas.

c. Where possible, joints below the roadway should be avoided. However, if joints below the roadway are necessary, they should be solvent welded, fusion welded, or in the case of bell joint PVC pipe, mechanically restrained.

d. Protection in the form of a concrete slab, or other acceptable method, must be provided in vulnerable locations, such as below ditches when there is less than the minimum cover.

3. Markers must be installed over the pipe which clearly define its location, product carried, operator and telephone number.

4. Detection tape or wire must be installed with all thermoplastic underground facilities.

5. Since the use of PVC for gaslines and polyethylene for waterlines is rare, applications to install either will be scrutinized on a case-by-case basis.

B. Water Distribution Lines. PVC piping used in water service must be made from compounds conforming to ASTM D 1784, and piping must be manufactured in accordance with ASTM D 2241 and AWWA C-900. Wall thickness for uncased PVC water line crossings must be at least that of DR 21 for pipe less than 4-inch nominal diameter and DR 18 for pipe equal to or larger than 4-inch nominal diameter.

C. Gas Distribution Lines

1. Design of natural gas distribution lines must be in accordance with Federal D.O.T. Title 49, applicable industry codes, ANSI/ASME B 31, and other state and DOTD policies as apply.

2. Polyethylene piping used in gas service must conform to ASTM D 2513.

3. Uncased crossings of up to 2 inches nominal diameter will be allowed provided the wall thickness is at least that of SDR 11. All crossings of polyethylene lines above 2 inches must be encased.

La. Admin. Code tit. 70, § II-519

Promulgated by the Department of Transportation and Development, Utility and Permit Section, LR 20:317 (March 1994).

AUTHORITY NOTE: Promulgated in accordance with R.S. 48:381-382, 48:193.