Denim Weaving Section · Karachi
142 kW Saved
How Sanyou Machinery & Technology reduced the Denim Weaving section at Soorty Denim Mill Karachi from 217 kW to 75 kW — a 142 kW saving with zero disruption to production.
✍ Sultan Mahmood
⏰ 7 min read
Denim weaving energy saving Pakistan reached a new benchmark at Soorty Denim Mill Karachi, where a Sanyou energy audit of the Denim Weaving section uncovered and permanently eliminated 142 kW of avoidable electrical load — cutting the section’s running consumption by 65.4% without stopping a single loom.
kW Installed Load
kW Load Before
kW Running Load After
kW Total Saved
Denim Weaving Energy Saving in Pakistan: The Challenge at Soorty Denim Mill Karachi
Soorty Denim Mill is one of Pakistan’s leading denim fabric manufacturers, operating out of Karachi with a vertically integrated production facility. The Denim Weaving section — the department where yarn is interlaced into denim fabric on high-speed rapier and air-jet looms — had an installed electrical capacity of 233 kW.
Before Sanyou’s intervention, the section was running at 217 kW — close to its full installed capacity. Loom main motors, warp beam drives, let-off and take-up motors, shed-forming mechanisms, weft insertion systems, and the associated HVAC and pneumatic infrastructure were all consuming power at levels that had never been individually measured or challenged.
No VFDs had been installed on ancillary motor circuits. Power factor had never been corrected at section level. No sub-metering existed to separate the Denim Weaving section’s consumption from the rest of the facility. The mill was paying for 217 kW of electrical demand when the actual productive work required far less.
Denim weaving sections run 24 hours a day, 340+ days a year, at high motor counts per loom. A facility with 100 looms has hundreds of individual motors — main drives, let-off units, take-up units, warp stop motion systems, and shed drives — all running simultaneously. The sheer density of motors, combined with the continuous operating cycle, means even a small per-motor saving multiplies into a very large section-level reduction. This is why denim weaving energy saving projects consistently deliver among the highest absolute kW savings in Pakistan’s textile sector.
What the Energy Audit Found in the Denim Weaving Section
Sanyou’s engineers clamp-metered every motor circuit across the Denim Weaving section during steady-state production. Four distinct sources of correctable electrical waste were identified and quantified.
Denim looms have numerous ancillary motors — warp beam let-off, fabric take-up, selvedge tuckers, weft feeders, pneumatic compressors, and humidity control fans — all running at fixed maximum speed during every operating state including maintenance stops, doff changes, and warp beam loading. These motors were not linked to loom production state. A loom stopped for 20 minutes for a warp break was still drawing full ancillary power throughout. VFDs tied to loom run-signals correct this immediately.
The Denim Weaving section’s climate control system — critical for maintaining yarn moisture and preventing warp breakages — was running at fixed full capacity regardless of ambient conditions, season, or production load. Humidity and temperature control fans operated on manual settings that had not been adjusted since commissioning. VFD-based demand control on HVAC motors, responding to actual temperature and humidity sensors, typically reduces climate control energy consumption by 35–50% without compromising weave room conditions.
The weaving section’s power factor had degraded to below 0.75. With KESC (K-Electric) billing Karachi industrial consumers on kVA demand, every unit of reactive power was being charged at the same rate as productive active power. A power factor of 0.75 means the mill was paying for 33% more electrical supply than it was productively using. Capacitor bank installation at the Denim Weaving distribution panel corrected this to 0.95+ immediately and without any change to production operations.
The Denim Weaving section shared a utility metering point with other departments. Its individual consumption had never been measured. Without a baseline, no corrective action had ever been possible and no benchmarking had ever been done against industry norms for denim weaving energy consumption per metre of fabric. Installing section sub-meters created the first accurate picture of actual consumption in the section’s operational history and enabled the before-and-after saving to be documented and verified.
The Result: 142 kW Eliminated from the Denim Weaving Section
Running Load Breakdown After Optimisation
142 kW — 65.4%
75 kW — 34.6%
The Denim Weaving section at Soorty Denim Mill Karachi now runs at 75 kW — less than one-third of its pre-optimisation load of 217 kW. 142 kW has been permanently removed from the facility’s electrical demand. Fabric production, loom speeds, and weave quality are unaffected. The saving is fully recurring — every month, every year.
The Four Interventions That Delivered 142 kW of Denim Weaving Energy Saving
Financial Impact: What 142 kW Saves Every Month
A Denim Weaving section energy optimisation project of this scope typically achieves full capital payback within 6 to 12 months at current K-Electric and WAPDA industrial tariff rates. After payback, the PKR 5.1M monthly saving is permanent — requiring no further capital expenditure to maintain.
Does Your Denim or Weaving Section Show These Warning Signs?
The conditions at Soorty Denim Mill Karachi are not unique to one facility. Fixed-speed ancillary motors, uncontrolled HVAC, degraded power factor, and absent sub-metering describe the majority of Pakistan’s weaving operations. Your facility almost certainly has recoverable savings if any of the following apply:
- ✔Loom ancillary motors run at fixed speed regardless of whether the loom is weaving or stopped
- ✔Weave room HVAC and humidification run at fixed capacity set during commissioning
- ✔Power factor below 0.90 on your K-Electric or WAPDA monthly bill
- ✔No individual sub-metering at weaving section level
- ✔Running load close to or equal to installed nameplate capacity
- ✔No denim weaving energy saving audit conducted in the past 3 years
Frequently Asked Questions
Sanyou Machinery & Technology conducts denim weaving energy saving audits for textile mills across Pakistan including Karachi, Lahore, Faisalabad, and Sheikhupura. No obligation. No production downtime. Documented, verifiable results.
Request Your Free Weaving Energy Audit →
Energy optimisation, textile machinery & HVAC engineering specialists — Pakistan. tmsanyou@icloud.com — 0300-4630297 — www.sanyou.com.pk