Sludge Silos with Sliding Frame Outloading

One of the largest existing WWTP located in the Kingdom of Saudi-Arabia.

SPIRAC in collaboration with Watequin supplied the sludge handling, storage and truck outloading systems for the latest upgrade. The project scope included 2 x 200m³ silos with high capacity sliding frame outloading systems, fabricated entirely of 316 stainless steel and two shaftless screw conveyor trains including 15m vertical lift from the centrifuge plant to the top of the silos. This design ensures odour and mess containment, low maintenance, low power consumption and extended life expectancy in a harsh coastal/desert environment.

SPIRAC Products used:

Two horizontal U420 shaftless conveyor
Two inclined OK420 shaftless conveyor
Two vertical OK420 shaftless conveyor
Two horizontal U420
Two sliding frames c/w hydraulic drives & two silo outloading conveyors U620

The system has been working reliable since 2015.

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08 Sep 2026

SPIRAC is pleased to announce that it will be exhibiting at WEFTEC 2026 at Booth #6753

SPIRAC is pleased to announce that we will be exhibiting at WEFTEC 2026, the world's largest annual water quality exhibition and conference, taking place in New Orleans, Louisiana, USA. Visit us at Booth #6753 to discover the latest innovations in solids handling, dewatering, screening, grit handling, and shaftless spiral conveying solutions.

Exhibitions & Meetings Municipal Solutions North America News

07 Jul 2026

Shaftless Spiral Slewing Conveyor Maximises Sludge Outloading Flexibility

SPIRAC has manufactured a 12-metre shaftless spiral slewing conveyor designed to provide a flexible solution for sludge outloading. The design incorporates a single pivot point at the inlet, allowing the entire conveyor to slew across a wide operating arc and discharge sludge over a large area.

Municipal Solutions Shaftless Spiral Conveyors

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Building Resilient Wastewater and Stormwater Infrastructure

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What They Are Saying

SPIRACs engineers had an uncompromising commitment to develop and manufacture a leading inlet works solution within time and budget, allowing us to develop a sustainable plant for the future

Great system. We have it onsite at Rubyanna WWTP, recommend them for any plants for the future or even retrofitting! Flawless and easy! Also recommend SPIROTAINER. Less than 5 minutes from entering site with one and leaving with a full one! Great idea guys.

SPIRACs engineers had an uncompromising commitment to develop and manufacture a leading inlet works solution within time and budget, allowing us to develop a sustainable plant for the future