Figure 1. Exploded view of the Vanton
pedestal mounted FLEX-I-LINER® pump
showing basic simplicity of construction.
Converting Peroxide Waste
into Profitable Sewage
Foremost Machine Builders, Inc.
FLEX-I-LINER Sealless Self-Priming Peristaltic Pumps
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Reprinted from PROCESSING
By Anthony Lawson, Director of Engineering, Foremost Machine Builders, Inc.
Creative processing system converts hazardous
peroxide waste into profitable sewage disinfectant
A large international supplier of medical devices approached Foremost
Machine Builders, Inc., of New Jersey with a serious problem: How to
extract a 50 percent solution of hydrogen peroxide from used and
unused pre-packaged caplets. The hydrogen peroxide caplets were
used in their line of medical device sterilization equipment, but some of
the caplets were never used, and even those that were used contained
hazardous residue that required special handling with high waste
Despite being recognized as a creative developer of customized process
equipment systems, this request presented multiple challenges
involved with handling a dangerous and toxic active oxidizing agent that
can burn those in contact with it before they become aware of the
danger. The system created had to accomplish the following:
• Gather and convey bulk amounts of the caplets from storage to a
• Break open the caplets and reduce the plastic to small flakes,
• Separate the liquid from the solids and transfer both the fluid and the
flakes to separate holding tanks,
• Transfer the hazardous liquid from the system holding tank to a
This is a true resource recycle application. Knowing hydrogen
peroxide's germ and bacterial killing abilities, and troubled by the high
cost of hazardous waste disposal, they realized that recovery of the
hydrogen peroxide could result in a saleable product for use by
municipalities for sewer sanitation treatment.
Design considerations included personnel safety since no contact with
the solution was permissible and special care in material selection was
required to ensure inertness to the corrosive chemical. The key
components of the system designed to convert hazardous waste into a
useful product includes:
1. An in-feed conveyor to gather bulk quantities of caplets and convey
them to a Foremost Granulator.
2. A granulator to break open the plastic caplets and reduce them to
3. A solid/liquid separator to direct the hydrogen peroxide liquid to a
designated filter/holding tank, and the plastic flake to a solid waste
container for disposal.
4. A discharge pump station to transfer the hydrogen peroxide from the
filter/holding tank to a portable container.
One of the most critical decisions involved in selection of the liquid
handling pump for which the following specifications had to be met:
1. The pump must be sealless to avoid leakage into the atmosphere or
onto the floor.
2. Self-priming was essential because of the stop-and-run intermittent
operation. In addition, the pump had to have run-dry capability to avoid
severe damage to the pump or motor in case of extended fluid
3. All fluid contact components were to be inert to hydrogen peroxide at
4. Dependable operation had to be ensured under conditions of
intermittent service emptying 45 gal (170 L) drums at 7 gpm (26.5 lpm).
After reviewing a wide variety of chemically inert pumps that might be
suitable for these difficult service conditions, Foremost system
designers selected a thermoplastic, sealless, self-priming rotary
peristaltic type design. Key to its selection was the fact that only two
pump components, the pump body and an elastomeric replaceable
liner, were in contact with the fluid (Figure 1). Both of these
components were available in a wide selection of non-metallic materials
(Figure 2) with a history of successful service in corrosive and other
Pump specifications called for a portable close-coupled, single-cavity,
flexible liner pump driven by a ½ horsepower (.37 Kw) , single-phase,
60 Hz, 1,800 rpm TEFC motor. The fluid path and proprietary design of
this pump isolates the chemical to the channel formed by the outside
surface of the flexible liner and the inside wall of the pump body. The
pump features linear replacement, which requires no special tools and
can be accomplished in a manner of minutes at the job site.
The decision was made to specify the heavy-sectioned pump body in
virgin, homogenous Teflon, and the rugged, flexible liner in the
fluoroelastomer Viton. These two DuPont fluoropolymer materials
provide the required chemical resistance to the corrosive, hazardous
hydrogen peroxide solution. Of equal significance was the assurance
against leakage provided by the unique design of these pumps. Any
leakage that might occur in the unlikely event of liner failure would tend
to be inside the pump and present no danger to plant personnel. The
result of such internal leakage would be a reduction in flow, but there
would be little danger of leakage or drippage onto the floor.
Figure 2. FLEX-I-LINER® pumps are
available in a variety of engineered
rigid plastics and elastomers enabling
them to safely handle just about every
corrosive or hazardous fluid over the
full pH range.
In the 1950, Vanton developed a revolutionary all-plastic pump for use in conjunction with the first heart-lung device. The design limited fluid contact to only two non-metallic parts: a plastic body block and a flexible liner. This was the birth of our Flex-I-Liner rotary pump. Its self-priming sealless design made it an industry standard for the handling of corrosive, abrasive and viscous fluids as well as those that must be transferred without contaminating the product. Vanton now offers the most comprehensive line of thermoplastic pumps in the industry.
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(+44) 01260 277040
Vanton Pumps (Europe) Ltd.
Unit 4, Royle Park
Congleton CW12 1JJ