BS EN 877 · SML · Hubless
Epoxy-coated socketless cast iron for gravity drainage. Manufactured in full compliance with BS EN 877:1999, DN50 to DN400, with couplings to BS 6087 and elastomeric sealing sleeves to BS EN 681-1.
Material performance
Robust cast iron construction with excellent impact resistance and no deformation under normal service.
Internal epoxy coating with a smooth bore, maintaining long-term hydraulic performance and system durability.
Pipes and fittings withstand static accidental water pressure of up to 5 bar when tested individually.
Cast iron mass and the elastomeric coupling sleeve absorb shock and vibration for a quieter drainage stack.
Non-combustible throughout, with low thermal expansion across the operating range.
Long design life, quick socketless installation, and full electrical continuity across the system.
Nominal sizes, dimensions & mass
Dimensions in mm, applicable to all pipes and fittings. Standard length 3000 mm. Sizes outside this range subject to order.
| Nominal width DN | Outer dia. mm | Mass per length | Wall nominal mm | Wall min. mm | Length mm |
|---|---|---|---|---|---|
| 50 | 58 | 13.0 | 4.2 | 3.7 | 3000 |
| 80 | 83 | 19.0 | 4.2 | 3.7 | 3000 |
| 100 | 110 | 25.5 | 4.2 | 3.7 | 3000 |
| 150 | 160 | 42.2 | 5.3 | 4.8 | 3000 |
| 200 | 210 | 69.5 | 6.0 | 5.0 | 3000 |
| 250 | 274 | 99.8 | 7.0 | 6.0 | 3000 |
| 300 | 326 | 133 | 8.0 | 7.0 | 3000 |
| 400 | 429 | 190 | 8.1 | 6.8 | 3000 |
Fittings
Bend 45°
| DN | A | kg | Item no. |
|---|---|---|---|
| 50 | 50 | 0.5 | 5045 |
| 80 | 60 | 1.0 | 8045 |
| 100 | 70 | 1.6 | 10045 |
| 125 | 80 | 2.3 | 12545 |
| 150 | 90 | 3.5 | 15045 |
| 200 | 110 | 6.2 | 20045 |
| 250 | 130 | 10.3 | 25045 |
| 300 | 155 | 17.3 | 30045 |
| 400 | 247 | 36.0 | 40045 |
Bend 88°
| DN | A | kg | Item no. |
|---|---|---|---|
| 50 | 75 | 0.7 | 5088 |
| 80 | 95 | 1.4 | 8088 |
| 100 | 110 | 2.1 | 10088 |
| 125 | 125 | 3.2 | 12588 |
| 150 | 145 | 4.9 | 15088 |
| 200 | 180 | 8.8 | 20088 |
| 250 | 220 | 13.8 | 25088 |
Fittings
Branch 88°, single. Double branch 88°, branch 45°, eccentric reducers, sewer pieces, access doors and ventilation bends are carried across the same size range — full tables in the catalogue.
| DN1/DN2 | A1 | A2 | A3 | L | kg | C | Item no. |
|---|---|---|---|---|---|---|---|
| 50/50 | 79 | 66 | 80 | 145 | 0.9 | 20.0 | 505088 |
| 80/80 | 95 | 85 | 95 | 180 | 2.0 | 21.0 | 808088 |
| 100/50 | 94 | 76 | 105 | 170 | 2.1 | 22.0 | 1005088 |
| 100/100 | 115 | 105 | 120 | 220 | 2.9 | 22.0 | 10010088 |
| 125/125 | 137 | 123 | 135 | 260 | 4.6 | 25.0 | 12512588 |
| 150/100 | 130 | 115 | 145 | 245 | 5.5 | 27.5 | 15010088 |
| 150/150 | 158 | 142 | 155 | 300 | 6.9 | 27.5 | 15015088 |
| 200/100 | 144 | 126 | 175 | 270 | 8.9 | 32.5 | 20010088 |
| 200/200 | 188 | 176 | 180 | 364 | 12.5 | 32.5 | 20020088 |
Jointing
Hubless couplings meet all mechanical requirements of BS 6087, with SS 304 or SS 316 shields and clamps and elastomeric sealing sleeves to BS EN 681-1. The sleeve compound resists abrasion, oil, grease, chemicals, UV, heat and cold, and cushions shock and vibration. All couplings maintain electrical continuity.
Rapid coupling
| DN | Bar | Bolt | Per box | Item no. |
|---|---|---|---|---|
| 50 | 0.5 | M5 | 100 | RW250050 |
| 80 | 0.5 | M8 | 100 | RW250080 |
| 100 | 0.5 | M8 | 100 | RW2500100 |
| 125 | 0.5 | M8 | 70 | RW2500125 |
| 150 | 0.5 | M8 | 50 | RW2500150 |
| 200 | 0.5 | M10 | 15 | RW2500200 |
| 250 | 0.3 | M10 | 4 | RW2500250 |
| 300 | 0.3 | M10 | 4 | RW2500300 |
Chromium steel band, galvanised bolt and nut, EPDM gasket.
Interlocking coupling
| DN | Bar | Bolt | Per box | Item no. |
|---|---|---|---|---|
| 50 | 10 | M8 | 10 | 402050 |
| 80 | 10 | M8 | 10 | 402080 |
| 100 | 10 | M8 | 10 | 4020100 |
| 125 | 5 | M10 | 10 | 4020125 |
| 150 | 5 | M10 | 10 | 4020150 |
| 200 | 3 | M12 | 2 | 4020200 |
Design & installation
Couplings accommodate misalignment up to 3° under 0.5 bar water pressure. Pipelines should still be properly aligned and supported during installation.
Maximum span between hangers on horizontal pipe 2.0 m. Coupling to nearest hanger ≤ 750 mm. For fittings ≤ 500 mm.
Pressure-test all pipelines before concealment or installation in areas with restricted access, to confirm system integrity before completion.
Applications
Above-ground gravity drainage — soil, waste and rainwater discharge; ventilation systems; aggressive effluent drainage; and underground drainage networks. Suitable for residential, commercial, high-rise and industrial buildings.
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