25 Pa. Code § 73.21 - Specifications
(a) Building sewers
shall be constructed of a durable material acceptable to the Department or the
local agency.
(b) The local agency
may restrict the type of materials used by code, ordinance or resolution and
shall notify the applicant when restrictions are imposed.
(c) When the average daily flow of sewage
from an establishment is 1,000 gallons or less, building sewers shall be at
least 3 inches in diameter unless otherwise specified by local plumbing or
building codes. When the average daily flow exceeds 1,000 gpd, all building
sewers shall be at least 6 inches in diameter unless otherwise specified by
local plumbing or building codes.
(d) Cleanouts shall be provided at the
junction of the building drain and building sewer.
(e) Cleanouts shall be provided at intervals
of not more than 100 feet.
(f)
Bends ahead of the treatment tank shall be limited to 45° or less where
possible. If 90° bends cannot be avoided, they shall be made with two
45° bends.
(g) The grade of the
building sewer shall be at least 1/8 inch per foot; however, the grade of the
10 feet of building sewer immediately preceding the treatment tank may not
exceed 1/4 inch per foot.
(h)
Building sewers shall be constructed with watertight joints, shall be of
sufficient strength to withstand imposed loads and installed on material
suitable for preventing damage from settling.
(i) The building sewer shall be installed to
allow continuous venting of the treatment tank through the main building stack
unless otherwise specified by local plumbing or building codes.
(j) Building sewers shall be connected to
treatment tanks by means of watertight mechanical seals or hydraulic grouting.
Use of Portland cement grouting is not permitted.
Notes
The provisions of this § 73.21 amended under section 9 of the Pennsylvania Sewage Facilities Act (35 P. S. § 750.9); The Clean Streams Law (35 P. S. §§ 691.1-691.1001); and section 1920-A of The Administrative Code of 1929 (71 P. S. § 510-20).
This section cited in 25 Pa. Code § 73.161 (relating to general).
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