- The HAPMAN Difference
- Equipment & Systems
- Industries Served
- Common Challenges
Not all drag conveyors are created equal. When your conveying needs are longer distances, unique layout configurations, over multiple levels, requiring numerous inlet and discharge points, with durability for handling abrasive material, or gentle handling for friable material, you need our Tubular Drag Conveyor.
Henry Hapman invented the Tubular Drag Conveyor in 1945 in Detroit, Michigan. The concept for the totally enclosed, multi-plane conveyor came from his industrial manufacturing experience as a mechanical engineer. He recognized the need for a conveyor that could effectively move material from point to point when the distance between the two was not a clear path. Mr. Hapman knew as World War II was ending the focus of industrial manufacturing would shift from government to consumer. He saw the Tubular Drag Conveyor as the way to effectively move material the distance of a plant, providing inlet stations and discharge points where needed. The vision of Henry Hapman forever changed the manner in which dry material is moved in industrial production facilities. Over the years, others have attempted to copy the Hapman Tubluar Drag Conveyor, but never creating a true equal. The engineering, design, and material handling experience coupled with the unyielding passion for efficient, reliable operation are the elements that make the Hapman Tubular Drag Conveyor the premium mechanical conveyor of modern manufacturing.
The fundamental operation of the Tubular Drag Conveyor is a chain with flights that pull material through a sealed pipe circuit. The conveyor is sealed to upstream and downstream equipment by a hard flange or a flexible sleeve. The layout of the conveyor allows for pipe bends and multiple inlet and discharge points. The Tubular Drag Conveyor can be routed through multiple planes and in any direction. The capacity of the conveyor is determined by the diameter of the flight and the speed at which the chain assembly can be pulled through the pipe The equipment operates as a high torque/low speed.
All of our Tubular Drag Conveyors are customized to fit your facility needs, including multiple inlet and outlet ports, 90 deg bends and more.
Custom-built systems convey your product effectively and reliably. Hapman's custom-built tubular drag systems move some of the toughest products up to hundreds of feet: hardened steel shot to bacon grease waste to fishmeal and bones to explosive materials. Paths are virtually limitless with multiple inlets and outlets. Our engineers can help you build a system based on your specific applications needs. In addition to optimum conveying, the sealed Tubular Drag Conveyor offers:
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-Hapman’s exclusive, self-cleaning discharge gate is rounded to the shape of the pipe so, unlike flat gates, there is no place for your product to get trapped.
Our engineered discharge gate; designed for complete material release with no residual
Brush Box for Easy Cleanability
Z-Style Conveyor Design
Loop Style Design
Chart demonstrates average capacity in cubic feet/minute based on pipe size and the optimum speed of the chain assembly moving through the conveyor
Pipe Casing Diameter & Material Options
3 in (76 mm) to 12 in (300 mm) diameter
Chain Material Options
Tivar® H.O.T. premium UHMW polyethylene
Maximum Conveyance Distance
85 ft vertically (26 m)
400 ft horizontally (122 m)
Convey up to 50 cfm (1.416 cmm)
You never have to worry about selecting the right chain and flight assembly for your application because we will work with you to determine the optimum assembly for your needs. We do not believe in a one-size fits all approach to conveying material. Our more than 60 years of experience supports and our testing of over 2600 materials confirms, mechanical conveying is most effective when the right combination of chain type and flight material are applied to the material characteristics of the conveyed material. This is why we offer the most comprehensive array of chain and flight options in the industry.
We offer the wide range of chain and flight options to provide you the best conveying equipment for your application. The options range from:
chain style vs. cable style assembly
Sealed Pin Chain
Flight material options range from UHMW Polyethylene, glass reinforced Polyethylene, cast steel, and iron. Each of which offers exceptional conveying properties when evaluating, bulk density, temperature, and other handling and material characteristics.
The most common chain and flight assembly is the sealed pin with UHMW Polyethylene flights. The configuration of chain type and flight material provides the longest life of 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:
Our wide array of chain and flight options. Each is engineered to provide optimum conveyance of material.
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