Oregon Administrative Rules › Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY › Division 73 - CONSTRUCTION STANDARDS › Section 340-073-0060 - Pipe Materials and Construction

Current through Register Vol. 63, No. 7, July 1, 2024
(1) Effluent Sewer Pipe: The effluent sewer
			 must be constructed with materials in conformance with state building sewer
			 standards. The effluent sewer pipe must have a minimum diameter of 3 inches.
			 When the septic tank is fitted with an effluent filter, the minimum nominal
			 diameter of piping may be reduced to 1-1/4 inches.
(2) Underdrain pipe. Underdrain pipe must
			 meet or exceed the requirements for Class 125 PVC pressure pipe as identified
			 in
ASTM Specification D 2241
. The pipe and fittings must be marked
			 as required by ASTM Specification D 2241. The underdrain pipe must be
			 perforated in accordance with subsection (4)(d) of this rule or with 1/4-inch
			 slots cut halfway through the pipe at 4 inches center to center.
(3) Polyvinyl chloride (PVC) pressure
			 transport pipe, pressure manifolds, and pressure lateral pipe and fittings must
			 meet or exceed the current requirements for Class 160 PVC 1120 pressure pipe as
			 identified in ASTM Specification D 2241. The pipe and fittings must be marked
			 as required by ASTM Specification D 2241. For pipe diameters of 1 inch or less,
			 the minimum pressure rating is 200 pounds per square inch (psi). For pipe
			 diameters greater than 1 inch, the minimum pressure rating is 160
			 psi.
(4) Distribution and Header
			 Pipe and Fittings.
(a) Polyethylene
			 distribution pipe in 10 foot lengths and header pipe in lengths of 10 feet or
			 greater must meet the current ASTM Specification F 405. Pipe and fittings must
			 also pass a deflection test withstanding 350 pounds per foot without cracking
			 or collapsing using the method in ASTM 2412. Pipe used in absorption facilities
			 must be heavy duty. Markings must meet requirements in ASTM F 405.
(b) Polyvinyl chloride (PVC) distribution and
			 header pipe and fittings must meet the most current
ASTM Specification D
			 2729
. Pipe and fittings must pass a deflection test withstanding 350
			 pounds per foot without cracking or collapsing using the method found in ASTM
			 2412. Markings must meet requirements in ASTM Specification D 2729.
(c) Polyethylene smooth wall distribution and
			 header pipe in 10-foot length and fittings must meet the most current ASTM
			 Specification F 810. Pipe and fittings must also pass a deflection test of 350
			 pounds per foot without cracking or collapsing by using the method found in
			 ASTM 2412. Markings shall meet the requirements in
ASTM Specification F
			 810
,
Section 9
.
(d) The three types of plastic pipe described
			 above must have two rows of holes spaced 120 degrees apart and 60 degrees on
			 either side of a center line. For distribution pipe, a line of contrasting
			 color must be provided on the outside of the pipe along the line furthest away
			 and parallel to the two rows of perforations. Durable ink markings must cover
			 at least 50% of the pipe. Markings may consist of a solid line, letters, or a
			 combination of the two. Intervals between markings must not exceed 12 inches.
			 The holes of each row may not be more than 5 inches on center and must have a
			 minimum diameter of 1/2 inch.