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Tuesday, July 6, 2021 

Dubai Electricity & Water Authority (DEWA) is a step closer to replacing its industrial pump bearings with grease-free Thordon water lubricated bearing solutions, following the installation of the Canadian companys pioneering technology to desalination plants across the United Arab Emirates.

In the first six months of this year, Ocean Power International (OPI), Thordon Bearings’ Dubai-based distributor, supplied ThorPlas-Blue and SXL bearings for installation to 20 butterfly valves and seven brine recirculation and vertical pumps, respectively. For quite some time now, DEWA has been systematically replacing its traditional bearings with Thordon products at facilities across Dubai. The first bearing retrofit was carried out more than 25 years ago.

OPI MD Rafid Qureshi said: “After hearing about the issues that DEWA was having with the original bearings, we proposed a solution that included ThorPlas-Blue. After checking load calculations and ensuring operating pressures did not exceed the bearing material’s 45 MPa (6,527 psi) tolerance, we machined and fitted the Thordon bushings. Since that first installation, we have replaced pump and valve bearings at several power generation and desalination plants across Dubai.”

In 2019 for example, OPI and Thordon completed bearing retrofits at the OPI workshop for a de-mineralisation pit pump after fabric lined metal bearings had worn out. And in May last year, 20 vertical pumps and six brine recirculation pump isolation valves at the OPI workshop were retrofitted with the Thordon polymer material.

“The bronze bushings originally installed in the vertical pumps were wearing out and causing frequent breakdowns every 6-8 months,” said Qureshi. “Unfortunately, there were multiple components that failed as a result of the bushing failure, forcing DEWA to find a longer lasting, more reliable solution. As the medium in these pumps is seawater, the new bearings had to be corrosion resistant, and capable of withstanding high operating speeds and temperatures up to 80°C (176°F). ThorPlas-Blue was deemed the ideal bearing grade for this kind of application.”

Since DEWA began operating their vertical pumps with the ThorPlas-Blue bearings, there has been zero downtime or increased vibration, Qureshi said.

“By installing ThorPlas-Blue, DEWA has saved about US$50,000 in downtime, eliminating unplanned maintenance and the costs associated with grease and spare parts procurement. Similar reductions in operational expenditures have been experienced across all of the company’s facilities following the Thordon installations,” he said.

Thordon Bearings’ Strategic Account Manager – Vertical Pumps, Keith Brand agreed: “The team at OPI have done a phenomenal job in saving this end user hundreds of thousands of dollars.”

The ThorPlas-Blue bearing can be used in all types of industrial pump applications as a replacement for bronze and other non-metallic bearings. It is available in a wide range of sizes and is easily machined to the dimensions required.

Developed as a maintenance-free alternative to greased bronze bearings, ThorPlas-Blue is a proprietary engineered thermoplastic bearing capable of dynamic operating pressures up to 45 MPa (6527 psi) and can easily be back fit into virtually all applications where greased bronze is currently installed. Higher pressures may be possible following a Thordon engineering review.

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