Built for the Crushing SeasonJuice, Molasses & Massecuite Duty
Rehman Engineering Works has kept Pakistani sugar mills running since 1948 — pumps, valves, castings and reverse-engineered spares for cane juice, syrup, molasses, massecuite, bagasse ash and food-grade CIP service. Designed for abrasive, acidic, high-Brix media and a 150-day non-stop season.
Pakistan Crushes Around 80 Million Tonnes of Cane
Pakistan is among the world's largest sugarcane producers, with roughly 90 operating sugar mills concentrated in Punjab, Sindh and Khyber Pakhtunkhwa. A mid-size mill crushes 6,000–12,000 TCD; the biggest units exceed 25,000 TCD. Crushing runs roughly November to April, and once a mill starts it does not stop — every hour of downtime is cane spoiling in the yard and lost recovery.
That season model dictates everything about the equipment. Pumps and valves must survive fibre, sand and mud in raw juice, 6–7 pH swings after sulphitation, 60–95 °C process temperatures, 90+ Brix molasses and massecuite that behaves like warm tar. Around them sit bagasse-fired boilers, co-generation sets, distillery and effluent plants, and increasingly a food-processing wing — edible oil, ghee, dairy, beverages, rice and confectionery — where the same utilities become food-contact duty.
REW's role has not changed since 1948: supply the rotating and flow-control equipment, keep it alive through the season, and manufacture the spare when the original supplier is long gone or six months away.
Cane Yard to Packed Sugar
Nine stations, each with its own wear mechanism. Drag the row sideways — every card shows what REW supplies into that stage.
Cane Yard & Weighbridge
Trucks and trolleys are weighed, unloaded by grab crane and fed to the cane carrier. Mud, stones and tramp iron enter here and travel with the cane all the way to the mills.
Preparation & Milling
Knives and shredders open the cane; a 4–6 mill tandem extracts juice under hydraulic loading while imbibition water is added counter-currently. Bagasse leaves at ~50% moisture.
Juice Weighing & Heating
Mixed juice is screened, weighed and raised to 70–75 °C in primary juice heaters before liming. Fibre and grit make this the hardest pumping duty in the plant.
Clarification & Sulphitation
Lime and SO₂ adjust pH to 7.0–7.2, flocculant is dosed and mud settles in the clarifier. Low pH excursions attack cast iron aggressively.
Evaporation
A quadruple or quintuple effect concentrates clear juice from ~15 to 60–65 Brix under vacuum, using exhaust steam and vapour bleeding for economy.
Crystallisation & Pans
Batch or continuous vacuum pans boil syrup to grain, producing A, B and C massecuite. Viscosity at C-strike can exceed 10,000 poise.
Centrifugal Separation
Batch and continuous centrifugals separate crystal from mother liquor. Final molasses goes to storage or the distillery; sugar goes to the grasshopper conveyor.
Drying, Grading & Packing
Sugar is dried, cooled, graded and bagged in 50 kg sacks. From here the hygiene regime is food-grade, not industrial.
Boiler House, Co-Gen & Effluent
Bagasse fires the boilers, steam drives turbines and process; ash and wash water head to the effluent plant. Utility failure stops the whole mill.
What Actually Fails in a Sugar Mill
Ten problems every mill engineer in Pakistan recognises — and the engineering answer we apply.
Sand & Mud Erosion in Juice Pumps
Cane arrives with field soil. Abrasive solids scour impeller vanes and wear rings, dropping head within weeks of season start.
Acid Attack After Sulphitation
A pH excursion below 6.5 turns clear juice corrosive; grey iron casings pit and gland areas wash out.
Massecuite Crystal Damage
High-shear pumping shatters crystal, destroys purity drop and loads the centrifugals with fines.
Molasses Cold-Start Seizure
High-Brix molasses stiffens overnight; the pump is started against a solid column and shears the coupling or trips the motor.
Bagasse Ash Slurry Wear
Ash is glass-hard silica. Standard cast iron slurry pumps and elbows are through in a single season.
Boiler Feed Pump Cavitation
Deaerator level swings and hot condensate cut available NPSH; the first stage cavitates and the rotor scores.
Knife Gate Valves Jamming on Fibre
Bagacillo and fibre pack the seat pocket; the gate will not seal and the operator cannot isolate for maintenance.
Scaling in Evaporators and Heaters
Calcium and silica scale kills heat transfer, forcing higher steam consumption and mid-season boil-outs.
Obsolete Imported Spares
Much of the installed base is 1960s–1990s European or Indian machinery; original suppliers no longer support the model.
In-Season Breakdown Pressure
An unplanned stop means cane deteriorating in the yard and growers at the gate. Lead time beats specification every time.
Equipment for Sugar & Food Duty
Manufactured, refurbished and reverse-engineered at our Lahore works. Drag the row or use the arrows.
Raw & Clear Juice Pumps
Non-clog and semi-open impeller centrifugals for mixed, sulphited and clear juice, sized on real fibre and grit loading.
- 50–600 mm
- CI / CF8M
- to 400 m³/h
Syrup & Condensate Pumps
Hot-well, vapour-condensate and syrup transfer sets built for vacuum-side suction conditions and 95 °C service.
- Hot service
- Low NPSHr
- Bronze / SS trim
Massecuite & Magma Pumps
Low-shear, wide-throat units with jacketed casings for A, B and C massecuite, magma and seed transfer without crystal damage.
- Jacketed
- Slow speed
- PD options
Boiler Feed & Utility Pumps
Multistage feed, cooling-water, spray-pond and fire-water sets, plus full overhaul of existing units with performance run.
- to 120 bar
- Multistage
- Rebuild service
Knife Gate & Butterfly Valves
Self-cleaning knife gates for fibrous juice and mud, plus butterfly and non-return valves for water, vapour and molasses headers.
- 50–2400 mm
- Manual / pneumatic
- API 598 tested
Sanitary Food-Grade Valves
SS316L tri-clamp butterfly and ball valves, CIP-compatible seals and fittings for dairy, beverage, ghee and confectionery plants.
- SS316L
- CIP ready
- Tri-clamp
Reverse-Engineered Spares
Impellers, casings, shafts, sleeves, gate discs, seats, gears and mill house castings copied from sample, drawing or measured sketch.
- Pattern making
- Material certs
- Any make
Ash, Effluent & Slurry Pumps
High-chrome and rubber-lined wet ends for bagasse ash, press mud, spray-pond and effluent duty with replaceable wear parts.
- 27% Cr
- Rubber lined
- Renewable liners
Where Each Product Is Installed
A schematic walk through the plant. Hover a node or a line item to see the pairing.
Sugar & Food Plant Specification Sheet
Working figures our engineering office uses when sizing for Pakistani mills.
| Service | Typical Flow | Head / Pressure | Temp | Key Consideration |
|---|---|---|---|---|
| Mixed / raw juice | 150–400 m³/h | 25–45 m | 30–40 °C | Fibre & sand; non-clog passages |
| Sulphited / clear juice | 150–350 m³/h | 30–50 m | 70–75 °C | pH 6.5–7.2; stainless wetted parts |
| Syrup (60–65 Brix) | 40–120 m³/h | 25–40 m | 60–80 °C | Viscosity rise; NPSH margin |
| A / B massecuite | 20–60 m³/h | 10–25 m | 55–70 °C | Low shear; crystal preservation |
| C massecuite / magma | 10–30 m³/h | 8–20 m | 45–60 °C | PD pump; jacketed casing |
| Final molasses (88–92 Brix) | 10–40 m³/h | 20–40 m | 45–55 °C | Trace heating; cold-start torque |
| Boiler feed water | 50–250 m³/h | 45–110 bar | 105–140 °C | NPSH at saturation; rotor balance |
| Bagasse ash slurry | 30–120 m³/h | 20–35 m | 40–60 °C | Silica abrasion; renewable liners |
| Component | Standard Duty | Severe Duty | Why |
|---|---|---|---|
| Casing | Grey iron GG25 / ductile | CF8M (SS316) cast | Acidic juice and vapour condensate attack iron |
| Impeller | Bronze / CI | CF8M or 27% Cr white iron | Grit erosion and pH excursion |
| Shaft | EN8 / EN19 | SS420 / SS316 sleeved | Gland leakage corrosion |
| Wear rings | Bronze | Hardened stainless | Maintains efficiency through season |
| Massecuite wet end | CI, jacketed | SS316 jacketed | Hygiene and steam-jacket thermal cycling |
| Food-contact parts | SS304 | SS316L, Ra ≤ 0.8 µm | CIP chemicals and food safety |
| Elastomers | NBR | EPDM / food-grade silicone | Steam, caustic CIP and food contact |
| Valve Type | Size Range | Rating | Application |
|---|---|---|---|
| Knife gate (self-cleaning seat) | 50–1200 mm | PN10 / PN16 | Mixed juice, mud, bagacillo, press mud |
| Butterfly (wafer / lugged) | 50–2400 mm | PN10 / PN16 | Water, vapour, syrup and molasses headers |
| Sluice & globe | 50–600 mm | PN16 / PN25 | Boiler house, condensate, utility isolation |
| Non-return (swing / dual plate) | 50–800 mm | PN16 | Pump discharge protection |
| Sanitary butterfly / ball | 25–150 mm | Tri-clamp | Dairy, beverage, ghee, confectionery lines |
| Pinch & diaphragm | 50–300 mm | PN10 | Lime slurry, flocculant, effluent dosing |
| Area | Standard | Applied To |
|---|---|---|
| Quality system | ISO 9001:2015 | All manufacturing and inspection |
| Centrifugal pumps | ISO 5199 / ISO 2858 / API 610 (where specified) | Process and utility pump design |
| Pump testing | ISO 9906 Grade 2 | Performance run before dispatch |
| Valve testing | API 598 / BS EN 12266 | Shell and seat hydrostatic test |
| Butterfly valves | AWWA C504 / BS EN 593 | Water and vapour service |
| Castings | ASTM A48 / A536 / A351 CF8M | Casings, impellers, discs |
| Food contact | 3-A hygienic principles / FDA-grade elastomers | Sanitary valves and fittings |
| Welding | ASME IX qualified procedures | Fabricated bodies and pipework |
Foundry, Machine Shop and Test Bay in Lahore
Pattern to painted, tested equipment under one roof — which is why an in-season spare can be turned around in days, not months.
Documented, Not Assumed
Every job leaves with a data pack: material certificates, dimensional report, NDE where specified, test curves and coating DFT records.
Pakistan's Sugar & Food Plants
From the cane yard in Jhang to the packing hall in Sanghar.
Chosen by Mill Engineers Since 1948
Season-Aware Planning
We plan around your crushing calendar — off-season overhauls scheduled and closed before start-up, in-season spares held to pattern.
Any Make, Any Vintage
European, Indian, Chinese or locally built machinery. If a sample, drawing or measurement exists, we can manufacture the part.
Foundry to Test Bay
Casting, machining, assembly, painting and testing in one Lahore facility — no chain of sub-vendors to chase.
Metallurgy That Matches Media
Material selection driven by pH, Brix, temperature and abrasives — not by whatever is on the shelf.
Documented Quality
ISO 9001:2015 system, material certificates, dimensional reports and witnessed testing on request.
Site Support Across Pakistan
Survey, erection, alignment, commissioning and condition reporting from Mardan to Mirpurkhas.
Questions From Sugar & Food Plant Engineers
Yes. We supply and rebuild positive-displacement and low-shear centrifugal massecuite pumps with jacketed casings, wide-throat suctions and slow-speed drives so crystal damage is avoided on B and C massecuite.
Yes. Most of Pakistan's sugar plants are European, Indian or Chinese supply. We reverse-engineer impellers, casings, shafts, sleeves, gate discs, seats and gearbox parts from a sample, an old drawing or a measured sketch, with material test certificates.
Emergency in-season spares are handled on priority from our Lahore works, with pattern stock for common pump sizes. Send the mill number, tag number and a photograph and we will confirm a realistic date the same day.
Cast iron and ductile iron for headers and molasses, CF8M / SS316 wetted parts for acidic juice and syrup, CA6NM or hardened high-chrome for ash and grit-laden duty, and food-grade elastomers on sanitary lines.
Cane juice carries sand, mud and fibre. Wear is controlled with correct suction geometry, reduced tip speed, larger vane passages, hardened or stainless wear rings and replaceable liners — not by oversizing the motor.
Yes. Multistage boiler feed pump rebuilds include rotor balancing, new sleeves and bushes, diffuser refurbishment, mechanical seal replacement and a performance run before dispatch.
Yes. SS316L sanitary butterfly and ball valves, tri-clamp fittings and CIP-compatible seals for dairy, beverage, edible oil, ghee and confectionery plants, with surface finish to specification.
Yes. Off-season scope typically covers pump and valve removal, workshop overhaul, alignment, re-installation, no-load and load trials, and a condition report with recommended spares for the next season.
Bores are machined up to 2400 mm on our vertical turret lathes, which covers every size used in a sugar mill, evaporator station or effluent plant.
Duty (juice, syrup, molasses, massecuite, condensate, ash slurry), flow and head, temperature, Brix or solids content, existing make and model, tag number, drive details, and any photographs or drawings of the part being replaced.
Send Us the Plant Data
Tell us the duty and the deadline. Our engineering office replies with a technical proposal, material selection and a realistic delivery date — not a catalogue page.
- Station and duty — mill house, clarification, pans, boiler house, effluent or food line
- Flow, head, temperature, Brix or solids content
- Existing make, model and tag number, with a photograph if available
- Whether the requirement is in-season emergency or off-season overhaul
- Any applicable standard or client specification