The Society Is OnlyAs Good As What Is Buried Under It
Rehman Engineering Works casts, machines and tests the water supply, sewerage, drainage and firefighting hardware that DHA, Bahria Town, Askari, Fazaia, LDA and private housing schemes install below their roads — valves, pumps, manhole covers, gratings, penstocks and hydrants, made in Lahore since 1948.
Pakistan Now Builds Cities, Not Just Colonies
Planned housing is the largest single consumer of buried municipal hardware in the country. DHA alone operates schemes in Lahore, Karachi, Islamabad–Rawalpindi, Multan, Bahawalpur, Gujranwala, Peshawar and Quetta, with DHA Lahore extended through Phases I to XIII and DHA City Karachi laid out on a sector grid of its own. Bahria Town runs comparable developments in Lahore, Rawalpindi and Karachi, alongside Askari and Fazaia schemes attached to the services, LDA and PHATA-approved schemes, cantonment board colonies and hundreds of private societies from Citi Housing and Lake City to Park View, Etihad, Al-Kabir and the new smart-city projects on the motorway corridors.
Every one of those sectors is the same engineering problem repeated: tube wells and a filtration unit, an overhead or underground reservoir, a ring main with zone isolation, house connections, a gravity sewer network, a disposal station lifting to a treatment plant or trunk sewer, storm drainage, a hydrant ring for firefighting, and thousands of covers, gratings, valves and chambers holding the whole thing together under traffic.
That buried hardware is what REW has manufactured since 1948. Our foundry pours the covers, frames, gratings and valve bodies; our machine shop finishes and assembles them; our test bay hydrotests every valve before it is painted. Developers, contractors and society engineering departments buy locally, in rupees, with certificates — and get replacements in days when a cover is stolen or a valve seizes ten years later.
Aquifer to House Connection and Back
Nine systems under every sector. Drag the row sideways — each card shows exactly what REW supplies into that stage.
Source & Tube Wells
Deep tube wells, and increasingly canal or surface allocation, feed the scheme. Falling water tables in Lahore and Rawalpindi push bores deeper every phase.
Filtration & Disinfection
Iron and turbidity removal, pressure sand filters and chlorination before water enters the network — the difference between a filtration plant on the brochure and one that runs.
Storage & Reservoirs
Overhead reservoirs and underground storage tanks balance day-night demand and hold firefighting reserve for the sector.
Distribution Ring Main
Looped mains under the boulevards and streets, zoned so a single street can be isolated without dewatering a whole block.
House Connections & Metering
Ferrule connections, boundary boxes, meter chambers and consumer isolation — where leakage and unbilled water quietly accumulate.
Gravity Sewerage Network
RCC and PVC sewers on shallow gradients with manholes at every junction and change of direction. Grease, sand and rag define the maintenance load.
Disposal Station & Lifting
Wet-well disposal stations lift sewage and storm water to the trunk sewer or treatment works. In monsoon, this is the station that keeps the sector dry.
Treatment & Reuse
Aeration, clarification and sludge handling, with treated effluent increasingly reused on green belts, parks and golf courses instead of tube-well water.
Storm Drainage & Firefighting
Gully gratings, kerb inlets, storm carriers and a hydrant ring sized for the commercial and high-rise plots inside the scheme.
What Actually Fails in a Housing Scheme
Ten problems every society engineering department and development contractor in Pakistan already knows — and the engineering answer we apply.
Rocking & Cracked Manhole Covers
Light or badly seated covers rock under traffic, crack at the frame, sink below the wearing course and turn into a claim on a brand-new boulevard.
Cover Theft & Open Chambers
Scrap value makes covers disappear overnight, leaving an open shaft on a residential street and a liability the society cannot defend.
Sluice Valves That Will Not Shut
Ten years of silt, hard water and no exercising and the gate will not seat. The street cannot be isolated, so the whole zone is dewatered for one leak.
Chambers Buried and Lost
Valve and washout chambers get paved over during phase development, so the network cannot be operated at all when a burst happens.
Disposal Station Chokes
Rag, wipes, sand and construction debris block sewage impellers. The wet well surcharges and the sector floods, usually during the first heavy monsoon.
Water Hammer on Rising Mains
A power trip slams the NRV, the surge cracks joints and blows out the pump house pipework — a routine event on load-shedding-prone networks.
Aggressive Groundwater Corrosion
Saline and high-sulphate soils in parts of Karachi, Multan and Bahawalpur eat unprotected iron buried hardware within a few seasons.
Tube Well Output Falling
Static water level drops phase after phase; the existing bowls run off-curve, motors overload and the sector goes to tanker supply in June.
Green Belt Irrigation on Potable Water
Parks, medians and golf greens pumped from potable tube wells burn energy and drain the aquifer the residents drink from.
Non-Standard Sizes at Handover
Phases developed by different contractors end up with mismatched clear openings, frame depths and flange drillings, so nothing is interchangeable.
Equipment for Housing Scheme Infrastructure
Cast, machined, assembled and tested at our Lahore works. Drag the row or use the arrows.
Sluice & Gate Valves
Resilient-seated and metal-seated, non-rising stem, flanged or socketed, for zone isolation, washouts and pump house duty on potable mains.
- 50–1200 mm
- PN10 / PN16
- BS 5163
Butterfly & Non-Return Valves
Wafer, lugged and double-flanged butterfly valves for reservoir inlets and large mains, with swing and dual-plate check valves on pump discharge.
- to 2400 mm
- Gear / actuated
- AWWA C504
Manhole Covers & Frames
Circular and rectangular, grey or ductile iron, hinged, lockable, recessed-infill and non-rock seated, with society name and utility cast into the face.
- 450–900 mm
- A15–E600
- EN 124
Gully Gratings & Kerb Inlets
Road gully, kerb inlet and channel gratings with hinged or bolted frames for storm drainage along boulevards, service roads and parking areas.
- C250 / D400
- Hinged option
- Silt bucket ready
Tube Well & Booster Pumps
Vertical turbine and horizontal centrifugal sets for tube wells, reservoir boosting and network pressurisation, with complete pump house pipework.
- 100–1000 gpm
- 30–90 m head
- Bronze / SS bowls
Sewage & Disposal Pumps
Vertical and horizontal non-clog and vortex pumps for wet-well disposal stations, storm sumps and treatment plant transfer duty.
- to 1500 m³/h
- Cast iron / CF8M
- Solids passage sized
Penstocks, Gates & Screens
Wall and channel-mounted penstocks, stop logs, weir and flap gates, and manual or mechanical bar screens for disposal stations and treatment works.
- to 4000 mm
- CI / SS304
- Rising / non-rising
Hydrants, Boxes & Pipe Specials
Pillar and underground fire hydrants, landing valves, surface and meter boxes, flanged bends, tees, tapers, puddle flanges and dismantling joints.
- BS 750
- BS EN 1092
- Made to drawing
Where Each Product Is Installed
A schematic walk through one sector of a scheme. Hover a node or a line item to see the pairing.
Schemes We Supply Across Pakistan
From DHA and Bahria phases to cantonment colonies, LDA schemes and private societies — the badge changes, the buried hardware does not.
Housing Scheme Specification Sheet
Working figures our engineering office uses when sizing and selecting for Pakistani housing schemes.
| Service | Typical Flow | Head | Pump Type | Key Consideration |
|---|---|---|---|---|
| Sector tube well | 100–1000 US gpm | 30–90 m | Vertical turbine / submersible | Falling static level; bowl staging and re-rating margin |
| Reservoir filling | 50–400 m³/h | 15–45 m | Horizontal centrifugal | Altitude valve control; avoid continuous throttling |
| Network boosting | 30–250 m³/h | 25–60 m | Multistage / VFD set | Diurnal demand swing; jockey pump for night flow |
| Sewage disposal station | 100–1500 m³/h | 8–30 m | Vertical non-clog | Solids passage vs screen bar spacing; duty-standby-assist |
| Storm water sump | 200–2000 m³/h | 5–15 m | Axial / mixed flow | Monsoon peak, not average; grit and debris tolerance |
| Treatment plant transfer | 50–600 m³/h | 6–20 m | Non-clog / vortex | Continuous duty; RAS and scum handling |
| Sludge transfer | 10–80 m³/h | 10–25 m | Non-clog / positive displacement | Solids concentration and abrasion allowance |
| Green belt irrigation (reuse) | 40–300 m³/h | 25–55 m | End suction centrifugal | Filtration ahead of sprinklers; non-potable marking |
| Fire pump set | 750–3000 lpm | 60–100 m | Horizontal split case / end suction | Jockey pump, auto start, NRV and relief arrangement |
| Basement drainage sump | 20–150 m³/h | 10–30 m | Submersible drainage | Float control, duty rotation, silt and grease ingress |
| Item | Size Range | Rating | Application |
|---|---|---|---|
| Sluice / gate valve (resilient seated) | 50–600 mm | PN10 / PN16 | Street and zone isolation on potable mains |
| Sluice / gate valve (metal seated) | 300–1200 mm | PN10 / PN16 | Trunk mains, pump house headers, reservoirs |
| Butterfly valve (wafer / lugged / DF) | 50–2400 mm | PN10 / PN16 | Reservoir inlet-outlet, large-bore mains, treatment works |
| Non-return valve (swing / dual plate) | 50–900 mm | PN16 | Pump discharge, surge protection on rising mains |
| Air valve (single / double orifice) | 25–150 mm | PN16 | Network high points, air release and vacuum break |
| Washout / scour valve | 80–300 mm | PN16 | Network low points, reservoir and main draining |
| Knife gate / penstock | 200–4000 mm | Head rated | Disposal station channels, screens, treatment works |
| Pillar fire hydrant | 80 / 100 mm | PN16 | Hydrant ring along boulevards and commercial plots |
| Underground hydrant & landing valve | 65 / 80 mm | PN16 | High-rise wet riser and apartment block hydrants |
| Surface box / spindle extension | Standard | — | Valve access at final road level |
| Load Class (EN 124) | Test Load | Clear Opening | Where It Is Used |
|---|---|---|---|
| A15 | 15 kN | 450–600 mm | Footpaths, lawns, pedestrian-only areas |
| B125 | 125 kN | 450–600 mm | House driveways, car parking bays, courtyards |
| C250 | 250 kN | 450–700 mm | Kerbside gully gratings, service lanes |
| D400 | 400 kN | 560–900 mm | Carriageways, boulevards, main sector roads |
| E600 | 600 kN | 600–900 mm | Commercial loading yards, heavy vehicle routes |
| Recessed infill cover | To class | 450–900 mm | Tiled plazas and paved commercial frontage |
| Hinged & lockable cover | To class | 560–900 mm | Theft-prone streets, valve and meter chambers |
| Rectangular chamber cover | To class | 600x600 to 1200x900 | Valve chambers, electrical and telecom pits |
| Gully grating & frame | C250 / D400 | 450x450 to 600x600 | Road gullies and kerb inlets on storm drainage |
| Step irons & ladder rungs | Load tested | — | Manhole and wet well access |
| Component | Material | Coating / Protection | Notes |
|---|---|---|---|
| Manhole cover & frame | Grey iron ASTM A48 Cl.35 / ductile ASTM A536 65-45-12 | Bitumen or black japan | Ductile preferred at D400 and above and in theft-prone areas |
| Gully grating | Grey or ductile iron | Bitumen | Hinged frames prevent displacement under traffic |
| Valve body & bonnet | Cast iron GG25 / ductile GGG40-50 | Fusion-bonded epoxy 250–300 micron | Potable-water compatible internal coating |
| Valve wedge | Ductile iron, EPDM encapsulated | Vulcanised rubber | Resilient seating, no seat groove to silt up |
| Valve stem & nuts | SS410 / SS304 stem, bronze nut | — | O-ring stem sealing, maintenance-free in chamber |
| Pump casing & impeller | Cast iron, bronze, CF8M | Epoxy / as duty requires | Bronze or SS bowls for tube wells with sand |
| Penstock frame & door | Cast iron / SS304 | Epoxy | SS304 for continuously wetted sewage channels |
| Fasteners in wet chambers | SS304 / SS316 | — | Mild steel bolts fail first in flooded chambers |
| Pipe specials & puddle flanges | MS fabricated / ductile | Epoxy or cement mortar lining | Made to site drawing and flange standard |
| Saline / high-sulphate soils | Ductile iron | Heavy FBE plus wrap | Coastal Karachi and southern Punjab chambers |
| Area | Standard | Applied To |
|---|---|---|
| Quality system | ISO 9001:2015 | All manufacturing and inspection |
| Sluice / gate valves | BS 5163 / BS EN 1074-2 | Design, seating and operation torque |
| Butterfly valves | BS EN 593 / AWWA C504 | Large-bore water and treatment duty |
| Valve testing | API 598 / BS EN 12266 | Shell and seat hydrostatic test, 100% of valves |
| Manhole covers & gratings | EN 124 (A15 to E600) | Load class, clear opening, seating and marking |
| Fire hydrants | BS 750 | Pillar and underground hydrants, landing valves |
| Castings | ASTM A48 / ASTM A536 / A351 CF8M | Covers, frames, bodies, impellers |
| Flanges & dimensions | BS EN 1092 / ASME B16.5 / BS 4504 | End connections and drilling |
| Pump testing | ISO 9906 Grade 2 | Performance run before dispatch |
| Coating | FBE 250–300 micron, DFT recorded | Potable-water wetted surfaces |
Foundry, Machine Shop and Test Bay in Lahore
Pattern to painted, tested product under one roof — which is why a phase schedule can be met sector by sector, and a replacement cover arrives in days.
Documented, Not Assumed
Every consignment leaves with a data pack: material and spectro certificates, load class verification for covers and gratings, hydrostatic shell and seat test records for valves, ISO 9906 pump curves and coating DFT sheets — ready for consultant and society inspection.
Pakistan's Housing Scheme Infrastructure
From trenches and pump houses to disposal stations, treatment works and the foundry floor in Lahore.
Chosen by Society Engineers Since 1948
One Source for the Whole Sector
Valves, covers, gratings, pumps, penstocks and hydrants from one works — one schedule, one delivery programme, one point of responsibility.
Patterns Retained for Life
Your cover and valve patterns stay on our foundry floor, so a replacement cast ten years later still fits the frame that is already in the road.
Phase-Paced Delivery
Bulk quantities scheduled sector by sector against the contractor programme, not dumped on site months early to be damaged or stolen.
Branding Cast In
Society name, phase, sector and utility marking cast into the cover face — identity, traceability and a real deterrent to resale.
Specification-Ready
BS 5163, BS EN 1074, EN 124, AWWA C504, BS 750 and API 598 references with certificates, for consultant, DHA, WASA and cantonment approval.
Import Substitution in Rupees
Locally cast and machined to the same or better specification — no LC, no shipping delay, no foreign-currency exposure on a phase budget.
Questions From Developers & Society Engineers
Yes. We cast and machine circular and rectangular covers and frames to EN 124 classes A15, B125, C250, D400 and E600 in grey iron to ASTM A48 and ductile iron to ASTM A536 65-45-12, in clear openings from 450 mm to 900 mm, with hinged, lockable, recessed-infill and non-rock triple-seated options.
Resilient-seated sluice valves for street and zone isolation, butterfly valves on reservoir inlets and large mains, single and double orifice air valves at high points, non-return valves on pump discharge, washout valves at low points, and pillar or underground hydrants on the firefighting ring.
Yes — non-clog or vortex sewage pumps in vertical or horizontal arrangement, penstocks and stop logs, manual or mechanical bar screens, discharge manifold with NRVs and sluice valves, guide rails, lifting arrangement and wet well covers, sized against the sector population and monsoon inflow.
Yes. Vertical turbine and submersible-driven sets with bronze or stainless bowls, column and lineshaft assemblies, complete pump house pipework, non-return and sluice valves, pressure gauge and flow meter — typically 100 to 1000 US gpm against 30 to 90 m head, tested to ISO 9906 before dispatch.
Our valves are manufactured and hydrostatically tested to BS 5163, BS EN 1074, AWWA C504 and API 598 as applicable, covers to EN 124, hydrants to BS 750 and flanges to BS EN 1092, BS 4504 or ASME B16.5 — the standards normally quoted in DHA, WASA, PHED, cantonment board and consultant specifications. Client and third-party witness testing is welcome at our Lahore works.
Standard cover, grating and valve sizes are held in pattern and in stock and dispatch within days. Bulk phase quantities are scheduled against your construction programme, sector by sector, so covers and frames arrive as the roads are cast — not months early to be damaged, and not late enough to hold up the wearing course.
Yes. We match the existing clear opening and frame depth, supply hinged and lockable versions where theft is recurring, and can upgrade to heavier ductile sections without changing the chamber. Send a photograph and two dimensions and we can usually identify the pattern.
Yes. Society name, phase, sector, a logo and utility marking such as WATER, SEWERAGE, ELECTRIC or TELECOM are cast into the face from a pattern insert — negligible cost on repeat quantities and a genuine deterrent to scrap resale.
Yes. Pillar and underground hydrants, landing valves, hydrant isolation valves, hose reel cabinets and fire pump sets with jockey pump, NRVs and relief arrangement for society hydrant rings, commercial blocks, malls and high-rise apartment projects inside the scheme.
Phase and sector, item and size schedule, load class required for covers and gratings, valve sizes and pressure rating, pipe material and flange standard, pump duty in flow and head, delivery programme, and any consultant or DHA specification clause that must be met.
Send Us the Phase Schedule
Tell us the sector, the quantities and the programme. Our engineering office replies with sizes, load classes, a technical proposal and a delivery schedule that fits your construction sequence.
- Scheme, phase and sector — new development, extension or replacement
- Item schedule with sizes: covers, gratings, valves, hydrants, pumps
- Load class required for covers and gratings (A15 to E600)
- Pipe material, flange standard and pressure rating on the network
- Pump duty in flow and head, or the existing make and model being replaced
- Delivery programme and any consultant or DHA specification clause