Stop rebuilding the same pump. If your screw pump has become a line item on the maintenance budget instead of a piece of production equipment, there is an engineered way out — sized to your material, your capacity, and your existing footprint.
Is Your Screw Pump Becoming a Maintenance Problem?
Screw pumps earned their place. For decades the Screw Pump was the backbone of dry bulk transport in cement and mineral processing, and for dry, free-flowing pulverized material it can still convey reliably.
But the demands placed on a modern plant, tighter availability targets, more abrasive and variable feedstocks, higher energy costs, longer parts lead times have outpaced what a mechanical screw was designed to absorb.
Your system may be ready for evaluation if you are experiencing:
-
Frequent screw, barrel, bearing, or seal replacement
-
Increasing maintenance labor and spare-parts costs
-
Unplanned downtime or declining system availability
-
High energy demand
-
Excessive pipeline or equipment wear
-
Difficulty maintaining the required conveying rate
-
Changes in material characteristics or production capacity
-
Obsolete equipment or limited replacement-parts availability
Common Shortcomings on Screw Pump
A screw pump moves product by spinning a high-speed screw to compress material against a weighted check valve. That seal is the whole mechanism and it holds metal against abrasive material under pressure, continuously.
Mechanical Wear
-
The problem: Screw flights and barrel wear under sustained pressure.
-
What it costs you: Seal and bearing replacement isn't a risk to manage. It's a line item you budget for.
Parts & Lead Times
-
The problem: Screws and barrels are specialized heavy-duty components with stretched lead times.
-
What it costs you: Expensive safety stock sitting on a shelf dead capital, so one pump can keep running.
Energy Loss
-
The problem: Compressing material to form the seal demands high torque and horsepower.
-
What it costs you: A large share of your draw goes to heat and friction instead of moving product down the line.
Feedstock Sensitivity
-
The problem: Shifts in moisture, particle size, or temperature disrupt plug formation.
-
What it costs you: Blow-back downtime, cleanup, and a safety exposure for anyone standing near the pump.
Effective & Reliable
Delta Ducon engineers complete screw pump replacement solutions using dilute-, semi-dense-, and dense-phase pneumatic conveying technologies. Because no single replacement works for every application, our team evaluates your material characteristics, capacity, conveying distance, vertical rise, plant layout, existing equipment, available footprint, and maintenance goals before recommending the right approach. Whether you need a drop-in replacement or a fully redesigned system, we deliver a solution engineered around your operation.
Dilute Phase
Conversion
Dilute-phase systems use higher air velocities to suspend and move material through the conveying line. They can provide a straightforward conversion for suitable materials and capacities, with flexible routing and continuous operation.
​
Consider dilute phase when:
-
The material can tolerate higher conveying velocities
-
A simple, reliable conveying arrangement is preferred
-
Capital cost is a major consideration
-
The application falls within an appropriate capacity and distance range
Semi-Dense Phase
Conversion
Semi-dense conveying balances air velocity, pressure, capacity, and material loading. It can be particularly valuable when a plant wants to modernize an existing screw-pump installation without completely changing its operating philosophy.​
​
Consider semi dilute phase when:
-
A drop-in or footprint-conscious replacement is needed
-
Lower material velocity is preferred
-
The material is moderately abrasive or friable
-
The plant wants to reduce wear without moving to full dense phase
-
Existing process connections should be retained where practical
Dense Phase
Conversion
Dense-phase systems move material at lower velocities and higher material-to-air ratios. This can help reduce pipeline wear, limit material degradation, and improve performance in long-distance or high-capacity applications.​
​
Consider dense phase when:
-
The material is highly abrasive
-
Pipeline wear is a persistent issue
-
Product degradation must be minimized
-
Long conveying distances are required
-
High capacities or multiple discharge points are involved
-
Greater control over the conveying cycle is needed
