Horizontal Directional Drilling (HDD) has revolutionised how underground pipelines and cables are installed. By eliminating the need for open trenches, it reduces surface disruption, traffic closures, and restoration costs. At the heart of every efficient HDD setup is one crucial component: a reliable bentonite pump.
Bentonite, a clay-based drilling fluid, lubricates the bore, stabilises the hole, and carries drill cuttings to the surface. Handling this heavy, abrasive fluid requires durable, high-performance pumps that can maintain flow and pressure under harsh conditions. That’s exactly what Gorman-Rupp delivers.
The role of bentonite pumps in HDD
During horizontal directional drilling, bentonite pumps are responsible for:
- Circulating drilling fluid between the entry pit and recycling unit
- Managing variable flow rates during pilot boring, reaming, and pullback
- Handling abrasive slurry without clogging or loss of performance
Simply put, the pump is essential in any drilling operation. It must be reliable, wear-resistant, and ready for continuous operation.
The challenge of pumping bentonite
Bentonite slurry is thick, viscous, and abrasive. It wears down impellers, causes blockages, and can trap air in the suction line. Pumps often need to handle intermittent flow or even prologued dry-running periods, all without losing efficiency or reliability.
A pump failure can halt an entire HDD operation. That’s why Gorman-Rupp’s S-Line and E-Line PAV4 and PAV6 pumps were developed specifically for bentonite and HDD applications. These dry self-priming vortex pumps combine robust construction, intuitive operation, and low maintenance demands.
Built for continuous operation
In HDD environments, pumps often run 24/7 under variable loads. The PAV-series maintains consistent performance even during stop-and-go operation. Large oil baths, efficient cooling, and precision seals prevent overheating and cavitation.
Beyond HDD applications
While developed for HDD, Gorman-Rupp bentonite pumps are equally suited to mining, tunnelling, civil engineering, wastewater bypass, and industrial slurry applications.
Built on experience, engineered for reliability
With nearly a century of pump engineering expertise, Gorman-Rupp continues to set the standard for performance and reliability. From our European headquarters in Waardenburg, the Netherlands, we provide local service, spare parts, and technical support.
Contact Gorman-Rupp Europe today, our experts will help you find the right setup for your project.
Why choose Gorman-Rupp bentonite pumps
- Dry self-priming vortex design – The PAV4 and PAV6 pumps use a vortex impeller that allows solids to pass freely. The built-in vacuum or compressor-venturi system enables quick priming even with an empty suction line.
- Proven wear resistance – Abrasive materials like sand and gravel are no match for the reinforced impeller and casing.
- Built for heavy-duty environments – Fully welded, hot-dip galvanised steel chassis provides maximum strength.
- Easy maintenance – Quick service without dismantling pipework.
- Unsurpassed priming : Gorman-Rupp’s proprietary TPAWS priming systems enables fast and trouble free priming under all conditions.
- Sustainable power options – Stage V diesel or electric drive for low-emission operation.
FAQs
What is a bentonite pump?
A bentonite pump is a heavy-duty pump designed to move the thick, abrasive drilling fluid used in HDD operations.
Why is bentonite crucial in HDD?
Bentonite acts as both a lubricant and a support fluid, stabilising the bore and cooling the drill head.
Which Gorman-Rupp pumps are best for bentonite?
The S-Line PAV4 and PAV6 series are purpose-built for bentonite and HDD applications.
Why use a self-priming pump for bentonite?
Above-ground, Self-priming pumps allow for easier operation and service. They remove air automatically, saving time and preventing air locks.
How should bentonite pumps be maintained?
Maintenance is simple thanks to Gorman-Rupp’s removable rotating assembly.
What is the difference between the PAV4 and PAV6 models?
PAV4 models deliver up to 220 m³/h, while PAV6 reaches 490 m³/h.
Can these pumps run on HVO or electricity?
Yes, both Stage V diesel and electric options are available.
In which industries are bentonite pumps also used?
Beyond HDD, they are used in mining, tunnelling, and industrial slurry handling.
