Tubular Drag Conveyors

Image of Hapman tubular drag conveyor in a Z-style configuration

Move a wide range of material continuously, reliably and effectively in any direction without dusting

Not all drag conveyors are created equal. When your requirements for conveying systems include longer distances, unique layout configurations over multiple levels, numerous inlet and discharge points, the durability to handle abrasive material, or the ability to gently handle friable material, you need tubular drag conveyors from Hapman.


Versatility Meets Durability in Hapman Tubular Drag Conveyors

Convey product in a completely sealed system. The sprocket drive in our tubular drag conveyors slowly pulls a heavy-duty chain through a fully enclosed pipe. As the chain moves your material through the pipe there is no chance for dusting, explosions or contamination issues.

Use less energy than other conveyors. The low-horsepower motor produces the slow, steady drag that cuts your energy costs when conveying powders or bulk solids.

Move challenging materials. Our tubular drag conveyors handle high-moisture ingredients and abrasive, blended, friable, easy-to-compact or smear products without compromising quality or efficiency.

One conveyor does the work of several. A modular design means we can configure our tubular drag conveyors to move your product vertically, horizontally, at any angle and around corners. Need more than one inlet/outlet in your bulk material handling process? Add as many as you need.


The fundamental operation of tubular drag conveyors involves a chain with flights that pull material through a sealed pipe circuit. They operate at high torque/low speed, and their capacity is determined by the diameter of the flight and the speed at which the chain assembly can be pulled through the pipe. Tubular Drag Conveyors are sealed to upstream and downstream equipment by a hard flange or a flexible sleeve. The layout of these conveyors allows for pipe bends, multiple inlet and discharge points, and routing through multiple planes and in any direction.

All of our tubular drag conveyors are customized to fit the specific bulk material handling needs of your application and facility.


Tubular Drag Conveyor Features


  • Dust-free operation. Tubular Drag Conveyors feature completely sealed construction that confines bulk materials within the equipment. You convey materials in any direction – horizontally, vertically, at any angle and around corners – without dusting, odors, contamination, or spillage.
  • Convey up to 50 cfm (1.416 cmm). A sprocket drive pulls a chain through a stationary outer casing. Flights attached at regular intervals along the chain convey material from inlet points to discharge points.
  • Longer life from chain than steel cable. Chain is less prone to fatigue, wear and stretch than steel cable. As individual parts on the chain wear out, you can replace them at a much lower cost and time expense than replacing the entire steel cable in other conveyors.
  • Work day-in, day-out with minimal chain wear. A heavy-duty chain allows you to start, stop and operate our conveyors under load all day long.
  • Discharge 100% of your product. Hapman’s exclusive, self-cleaning discharge gate is rounded to the shape of the pipe. Unlike flat gates in other conveyors, there is no place for your product to get trapped.
  • Minimal maintenance required. The automatic chain take-up idler in our Tubular Drag Conveyors makes adjustments as the chain stretches so you don’t have to do regular manual tightening.
  • Eliminate multiple conveyors with multiple inlets/outlets. We can install numerous inlets and/or discharge points into a single tubular drag conveyor, allowing you to add ingredients and discharge product all along the way. Tubular construction lets you reconfigure your design as your floor layout or process needs change.
  • Reduced energy usage. A low-horsepower, electric motor drives material for hundreds of feet.


Tubular Drag Conveyor Options

Hapman’s custom-built tubular drag conveying systems move some of the toughest products up to hundreds of feet: from hardened steel shot to bacon grease waste, from fishmeal and bones to explosive materials. Our expert consultants and engineers can spec out and build a system based on your specific bulk material handling needs. Paths are virtually limitless and multiple inlets and outlets are possible with our Tubular Drag Conveyors.

In addition to optimum conveying, our sealed Tubular Drag Conveyors offer:

  • Process efficiency
  • Increased worker safety from clean, dust-free operation
  • Excellent material integrity with minimal degradation / segregation
  • Low energy consumption
  • Minimal maintenance requirements
  • Brush box cleaning
  • Discharge gate
  • Auto-tensioner

Improve product flow when you install mechanical vibration. An offset weight and hammer system taps on the tops of flights to dislodge material.

Fully discharge material with Hapman’s exclusive, self-cleaning discharge gates. Unlike flat gates in other conveyors, ours are rounded to the shape of the pipe so there is no place for your product to become trapped.

Tubular Drag Conveyor Discharge Gate For Complete Material Release | Hapman.com

Discharge Gate for Complete Material Release. See video below to view process.

Tubular Drag Conveyor Brush Box | Hapman.com

Brush Box for Easy Cleanability. See video below to view process.


Tubular Drag Conveyor Specifications

The chart below represents the optimum convey rate for most materials based on average capacity in cubic feet/minute and pipe size. Actual capacities vary depending on the material type, its abrasiveness and flow character.

Pipe Casing Diameter & Material Options
3 in (76 mm) to 12 in (300 mm) diameter
Carbon steel
Stainless steel

Chain Material Options
Carbon steel
Stainless steel

Circular Flights
Cast iron
Ductile iron
Stainless steel
UHMW polyethylene
Tivar® H.O.T. premium UHMW polyethylene

Maximum Conveyance Distance
85 ft vertically (26 m)
400 ft horizontally (122 m)

Maximum Conveyance Speed
Convey up to 50 cfm (1.416 cmm)


Chain vs. Cable – Which Conveying Type Works Best?

During your evaluation of tubular drag conveyors to determine the best match your bulk material handling needs, you will need to assess the cable vs. chain comparison. While every application has different requirements and measurements for value, we present some of the most common differences between the two conveying types for your review.

Tubular Conveyor Chain vs. Cable Comparison

The importance of choosing the right conveyor chain and flight assembly

You never have to worry about selecting the correct chain and flight assembly for your bulk material handling application. We will work with you to determine the equipment that best suits your specific needs. We do not believe in a one-size-fits-all approach to conveying material.

As confirmed by our more than 70 years of experience and our testing of over 2,600 distinct materials, mechanical conveying is most effective when the right combination of chain type and flight material is applied to the characteristics of the conveyed material. That’s why we offer the most comprehensive array of chain and flight options in the industry to provide you the best conveying equipment for your application. The options range from:

  • Sealed pin
  • Universal sealed pin
  • Drop-forged or rivetless chain
  • Round link


Flight material options range from UHMW polyethylene, glass reinforced polyethylene, cast steel, and iron. Each is engineered for exceptional conveying properties when evaluating bulk density, temperature, and other handling and material characteristics.

  • UHMW polyethylene
  • Cast iron
  • Tivar® H.O.T. premium UHMW polyethylene
  • Ductile iron
  • Nylon
  • Stainless steel

The most common chain and flight assembly is the sealed pin with UHMW polyethylene flights. This configuration of chain type and flight material provides the longest life for the flight and least maintenance for the chain in most material conveying applications. The sealed pin chain is engineered specifically for moving dry material of various size and bulk density. The main advantages are:

  • The sealed pin keeps gritty, abrasive material out of the chain knuckle, reducing the need for frequent maintenance and significantly extending the life of the chain.
  • UHMW is cost-effective, lightweight, has excellent release properties, is low cost, and has a high wear resistance coupled with a low friction/drag. Each of these properties provides optimum conveying with low horsepower for reduced energy consumption.


Product Brochures
Product Brochure: Tubular Drag Conveyors
Corporate Brochure



  • Gentle Handling
  • Product Separation
  • Product Degradation
  • Clean-in-Place



See what our customers frequently buy with the Tubular Drag Conveyor

Bulk Bag Unloaders
Bulk Bag Filler
Bag Dump Station


Headshot of Hapman's Eric Smith

Contact: Eric Smith

Product Specialist
(269) 382-8238
Email Me


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