In short: where the air is full of dust, salt or heat, an air-cooled motor runs hot and fails early. A water-jacket cooled motor takes its cooling from the plant water circuit and ignores the air around it. BTGC supplies WEG WGM motors and services them at the WEG approved service center in Jubail.
Large motors in Saudi plants work in air that is hot for most of the year and often loaded with dust or salt. In cement raw mills and kiln drives the dust blocks cooling fins; at coastal desalination plants the salt corrodes them. Either way the motor runs above its design temperature, the insulation ages faster and the winding fails years before it should.
Why air cooling struggles here
An air-cooled motor moves heat from its windings to the frame, and from the frame to the air through fins and a fan. Three things defeat it in the Kingdom:
Ambient air above 45 °C leaves little margin before the insulation limit.
Dust settles on the fins and acts as a blanket.
Salt-laden air corrodes fins and fan guards, cutting airflow year after year.
The usual answer, a larger motor or a derated one, costs more and takes more space.
How a water-jacket cooled motor works
A water-jacket cooled motor has a cooling circuit cast into or wrapped around its frame. Plant cooling water passes through the jacket and carries the heat away. The motor needs no external fan and no clean air. Its temperature follows the water temperature, not the ambient air.
| Air-cooled motor | Water-jacket cooled motor | |
|---|---|---|
| Depends on | Ambient air quality and temperature | Cooling water supply |
| Dust and salt | Reduce cooling over time | No effect on cooling |
| Noise | Fan noise | Lower, no fan |
| Size for the same power | Larger frame | More compact |
| Best for | Clean, ventilated plant rooms | Desalination, cement, mining, enclosed rooms |
WEG WGM motors from BTGC
WEG builds the WGM series of water-jacket cooled motors for exactly these conditions. The range BTGC supplies in the Kingdom covers:
WGM water-jacket cooled induction motors for pumps, fans and mills
High voltage M-Line and W60 motors up to 50 MW for compressors and large pumps
M-Mining slip ring motors for high-inertia starts on cement kilns and raw mills
W22 and W22X low voltage motors, including explosion-proof designs
MVW medium voltage drives and SSW soft starters to match
Typical Saudi applications in the BTGC catalogue are SWCC desalination pumping and cement production areas where ambient dust and heat make air cooling impossible. See the range on our page for WEG motors in Saudi Arabia and the full electric motors and drives offer.
Replacing an old motor without civil work
Most enquiries BTGC receives are replacements, not new installations. The new motor must fit the old foundation, shaft height and coupling. BTGC designs and fabricates transition bases and adapter plates so the new WEG unit bolts onto the existing foundation, with no re-grouting. The catalogue calls this the drop-in program: a shutdown measured in days rather than weeks.
BTGC support in Dammam, Jubail and Yanbu
BTGC has supplied WEG motors to Saudi industry for years and operates the WEG approved service center in Jubail. The center rewinds, overhauls, balances and load-tests LV, MV and HV motors up to 10 MW and 13.8 kV, with Class H and F insulation systems built for desert heat. Field teams cover power and water utilities, petrochemical plants and cement works from the Dammam, Jubail and Yanbu branches.
To quote a replacement, send us the nameplate photo, the duty (pump, fan, mill), the ambient conditions and the cooling water available.
Questions buyers ask
Does a water-cooled motor need special water? It needs clean cooling water within the temperature and flow limits on the datasheet. Most plants take it from the existing closed cooling circuit.
Can it replace an air-cooled motor of the same frame? Often yes, with an adapter base. BTGC checks the shaft height, flange and terminal box position before quoting.
Who repairs it in the Kingdom? The BTGC service center in Jubail, which is WEG approved.
Contact the BTGC power team
Email power@btc-ksa.com or call +966 13 856 0528. Branches: Dammam, Jubail and Yanbu. Request a quote.