N.J. Admin. Code § 7:9A-9.3

Current through Register Vol. 56, No. 21, November 4, 2024

Section 7:9A-9.3 - Connecting and delivery pipes

(a) Connecting pipes between pretreatment units and dosing tanks, distribution boxes or distribution networks, and delivery pipes discharging effluent from dosing tanks shall be of such size as to serve the connected fixtures but in no case less than one and one half inches in diameter. Delivery pipes from dosing tanks using siphons shall be one nominal size larger than the siphon to facilitate venting.

(b) Delivery pipes for pressure dosing networks shall be constructed of Polyvinyl Chloride (PVC) plastic (ASTM D-2665), schedule 40, SDR-21 or SDR-26; or Acrylonitrile-Butadiene-Styrene (ABS) plastic (ASTM D-2661). Connecting pipes may be constructed of any of the following materials:

1. Plastic meeting the following criteria:

i. PVC (ASTM D 2665)--schedule 40, SDR-21 or SDR-26; or

ii. ABS (ASTM D-2661).

2. Cast-iron; or

3. Other material acceptable to the administrative authority.

(c) All pipe joints in connecting pipes and delivery pipes shall be made water-tight and protected against damage by roots.

(d) Connecting pipes and delivery pipes shall be laid on a firm foundation satisfactory to the administrative authority.

(e) The alignment and grade of connecting pipes shall meet the following requirements:

i. Connecting pipes shall have a minimum grade of one-quarter inch per foot unless otherwise authorized by the administrative authority.

ii. Connecting pipes shall be laid in a continuous grade and, as nearly as possible, in a straight line. Drop manholes may be installed if found necessary. Horizontal bends, where required, shall not be sharper than 45 degrees. The inside angle between adjacent sections of pipe shall be no less than 135 degrees.

(f) In cases where the delivery pipe from the dosing tank will be installed higher than the maximum expected depth of frost penetration, measures shall be taken, as outlined in this subsection, to insure that the delivery pipe will drain at the end of each dosing cycle.

1. In the case of dosing tanks using pumps, when the low-water level in the tank is lower than the invert of the distribution box or distribution network, the delivery pipe shall be sloped back towards the dosing tank and there shall be no check-valve at the pump so that the delivery pipe will drain back into the dosing tank at the end of each dosing cycle. Also, a one-eighth inch weep hole shall be provided, at the invert of the pump discharge pipe, at a point which is above the high water level in the dosing tank.

2. In the case of dosing tanks using siphons, or when a pump is used and the elevation of the low-water level in the dosing tank is higher than the invert of the distribution box or distribution network, the distribution network must be designed so that the delivery pipe (as well as the manifold pipe, in pressure distribution systems) will drain out through the distribution laterals at the end of each dosing cycle. In the latter case, where a pump is used, a one-eighth inch weep hole shall be drilled in the delivery pipe, at its highest point within the dosing tank, to prevent effluent from siphoning out of the tank between dosing cycles.

N.J. Admin. Code § 7:9A-9.3

Amended by R.1993 d.294, effective 6/21/1993.
See: 24 N.J.R. 1987(a), 25 N.J.R. 2704(b).
Amended by R.2012 d.066, effective 4/2/2012.
See: 43 N.J.R. 478(a), 44 N.J.R. 1047(a).
In the introductory paragraph of (b) and in (b)1ii, substituted "D-2661" for "2661"; and in the introductory paragraph of (b), substituted "D-2665" for "D 2665".