This article is about Storm Water Drainage Systems Installation & Design and Technical Requirement in commercial buildings, plants and refinery projects related to Plumbing Engineering System as per international codes and standards.
Storm Water Drainage Systems Installation & Design
- Following are the acceptable materials for storm drains that are a part of Oily Water Sewer Systems:
a) Reinforced concrete pipe, ASTM C76M Class III, Wall B, for pipes 300 mm and larger. Joints shall be sealed using elastomeric “”O”” rings according to ASTM C443 unless otherwise
noted in project specification.
b) Steel pipe, ASTM A53, or API SPEC 5L Grade B, Standard Weight, cement lined and externally coated in accordance with SAES-H-002
c) cast iron soil pipe and fittings, ASTM A74, service (SV) weight.
d) RTR (fiberglass) pressure pipe and fittings with restrained joints. Such pipe shall be used only below ground
e) Ductile iron pipe, ASTM A746, cement lined and externally coated in accordance with SAES-H-002 (SAES-S-020 Section 5.1). - Acceptable material for Storm Drain that are not part of a Oily Water Sewer System:
A) Material listed in item 1
B) Underground (Hydrocarbon area)
a) RTR (fiberglass) Pressure Pipe
b) RTR (fiberglass) Sewer Pipe
b) HDPE* * HDPE shall be used only for slipping of existing sanitary sewer pipe
C) Underground (Non-Hydrcarbon area)
a) RTR (fiberglass) Pressure Pipe
b) PVC PIPE Schedule 80 (125 class)
c) SASO SSA/14, Class 5.
d) HDEP
e) RTR (fiberglass) Sewer Pipe
f) PVC PIPE
g) SASO SSA/14, Class 3. (300 mm or less diameter)
h)HDPE
D) Above ground (Hydrocarbon and Nonhydrocarbon areas)
a) RTR (fiberglass) Pressure Pipe
b) RTR (fiberglass) Sewer Pipe
c) PVC PIPE
d) SASO SSA/14, Class 3. (300 mm or less diameter)
e)HDPE (SAES-S-010 Section 6.1) - Verify that locations (coordinates) and elevations of the storm drains are as shown in the Issued for Construction Drawings
- The minimum diameter of a storm drain pipe (except building connections) or road crossing culvert shall be 300 mm.
- Branch lines to individual drain inlets shall not be smaller than 200 mm.
- The ends of road crossing culverts and the exit of storm drains at an open channel shall have concrete headwalls.
- The headwalls, as well as the ends of concrete box culverts, shall have a cut-off wall at the entrance or exit lip of not less than 0.6 m below the channel invert.
- The maximum spacing between drainage inlets should not exceed 90 m.
- Manholes are required at changes of horizontal or vertical direction of storm drain pipes.
- Maximum Spacing of manholes shall be 60m for sewers less than or equal to 300 mm in diameter and 150m for sewers larger than 300 mm in diameter
- Storm drain manholes shall have a minimum inside diameter of 1.2 m for straight run manholes with a pipe diameter size of 600 mm or less
- Storm drain manholes shall have a minimum inside diameter of 1.8 m for straight run manholes with a pipe diameter size larger than 600 mm.
- Storm drain manholes shall have a minimum inside diameter of 1.8 m for junction manholes.
- Rip-rap shall be solid stone or concrete measuring at least 300 mm in all dimensions.
- Rip-rap shall be hand laid to provide a tight fit between the individual pieces
- The rip-rap shall be solid grouted for a distance of not less than 3 m upstream and downstream of concrete box culverts and along the outside face of all curves plus 3 m upstream and downstream of the curve tangent points.
International Codes and Standard References for Storm Water Drainage Systems
SAES-S-030 – Storm Water Drainage Systems.
SAES-S-010 – Sanitary Sewers.
SAES-S-020 – Industrial Drainage and Sewers.
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