Inside-building DWV stacks (32mm - 160mm) and underground municipal gravity sewer mains (110mm - 500mm SN 4 & SN 8) for heavy infrastructure.
Direct pricing from the Jeddah plant, with technical submittal support.
Product photos from ALFA assets and supporting catalogue imagery for this family — for visual reference during specification and RFQ.
ALFA drainage and sewer systems provide superior fluid flow dynamics with Manning roughness coefficient n=0.009, eliminating scale buildup, biological slime adhesion, and root intrusion. Available with solvent cement push-fit joints for above-ground plumbing and elastomeric EPDM rubber ring joints for underground municipal sewer trunks.
Soil & Waste DWV Stacks (32mm - 160mm)
View Detailed Sizing & Specs →Heavy Municipal Gravity Sewer SN 4 / SN 8 (110mm - 500mm)
View Detailed Sizing & Specs →| Nominal Size (DN) | Outside Diameter (mm) | SN 4 Wall Thickness (mm) | SN 8 Wall Thickness (mm) | Flow Capacity (L/s @ 1% slope) | Max Traffic Burial Depth |
|---|---|---|---|---|---|
| DN 110 | 110.0 mm | 3.2 mm | 3.2 mm (Solid Wall) | 9.4 L/s | Up to 4.0 meters |
| DN 160 | 160.0 mm | 4.0 mm | 4.7 mm | 26.8 L/s | Up to 6.0 meters |
| DN 200 | 200.0 mm | 4.9 mm | 5.9 mm | 51.2 L/s | Up to 6.0 meters |
| DN 315 | 315.0 mm | 7.7 mm | 9.2 mm | 174.5 L/s | Up to 7.0 meters |
Our uPVC Soil, Waste & Sewer Pipes are manufactured using 100% virgin lead-free resin under strict ISO 9001 and Saudi Aramco Vendor #10116102 quality standards, delivering superior burst strength, thermal stability, and corrosion immunity.
Depending on the exact specification, systems comply with DIN 19531, DIN 19534, EN 1401, BS 4514, SASO 14/1517.
Available in sizes from 32 mm to 500 mm, supporting Gravity Flow / Ring Stiffness SN 4 (4 kN/m²) & SN 8 (8 kN/m²).
Thermoplastic piping provides 100% galvanic corrosion immunity, making it impervious to high sulfate and chloride sabkha soils found in coastal Saudi regions.
Every order is accompanied by factory mill test certificates (MTC), dimensional compliance sheets, and third-party laboratory burst test reports.
Yes, our Jeddah fabrication plant manufactures matching sweep bends, tees, and flange adaptors fully rated for system working pressures.
Western Province: 24h; Central/Riyadh: 24-48h; Eastern/Northern/Southern: 48-72h.
Upload your tender BOQ schedule using the upload modal on this page or email sales@alfaalarabia.co for immediate factory-direct pricing.
In hot desert sewer networks, septic conditions generate gaseous H2S which bacteria oxidize into 5–10% sulfuric acid on the pipe crown. Concrete and ductile iron suffer rapid corrosion, whereas uPVC is 100% impervious to acid attack.
Ring stiffness (ISO 9969) measures resistance to vertical soil and traffic loading. SN 4 (≥ 4 kN/m²) is suitable for general burial depths up to 3m; SN 8 (≥ 8 kN/m²) is mandated for deep trenches (> 3m) and heavy highway traffic crossings.
Pipes feature factory-fitted elastomeric EPDM rubber sealing lip rings conforming to EN 681-1, providing durable flexibility, chemical resistance, and root-penetration resistance under cyclic ground settlement.
Due to the ultra-smooth hydraulic bore (Manning's n = 0.009), uPVC pipes achieve self-cleansing velocity (≥ 0.7 m/s) at shallower slopes than concrete, saving substantial deep excavation and dewatering costs.
ALFA manufactures custom fabricated puddle-flange wall pass-through spools and flexible rocker pipe assemblies (0.5m to 1.0m length) that absorb differential settlement between rigid concrete manholes and flexible pipeline trenches.
Post-installation deflection testing using a 95% proving mandrel or electronic laser profilometer confirms pipe diametral deflection remains well within the international standard limit of ≤ 5% after full backfill compaction.
