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TL-171

Figure 1. Close-up of magnetic-drive pump

with casing opened to show solid

thermoplastic casing, impeller and

bearing housing.

Thermoplastics for Plants & Municipalities

INDUSTRY:

ENTITY:

SOLUTION(S) PUMPED:

PUMP TYPE(S):

Wastewater Industrial

Various

Acids, Alkalies, Alum, Carbon slurries, Sodium hydroxide,

CHEM-GARD Horizontal Centrifugal Pump, SUMP-GARD Thermoplastic Vertical Pump

 

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Reprinted from POLLUTION ENGINEERING

 

Chemical plants and municipalities rely on

thermoplastic pumps for odor control, corrosion

resistance and reduced maintenance.

 

A recent study conducted by Pollution Engineering revealed that

approximately 40% of the respondents use nonmetallic pumps at their

facilities... even more significant, approximately 30% expected the

number to increase over the next three years. The primary reasons for

the current and anticipated use of plastic pumps were superior

corrosion and abrasion resistance and ease of maintenance when

compared with metals.

 

With the growing awareness of the significance of clean air and clean

water, there has been an increased use of nonmetallic pumps in a

variety of applications. These include scrubbing systems for odor

control, chemical feeding for enhanced coagulation, water recovery

projects, and neutralization of acidic or alkaline solutions as well as the

treatment of a wide range of liquid wastes or toxic fumes to satisfy

government regulations.

 

Consulting engineers and plant operating management play a major role

in the specification of pump designs as well as materials of

construction... more so than ever because thermoplastic pumps offer a

broad choice of chemically-inert formulations for the safe handling of

chemicals over the full pH range, and are now available for

temperatures to 300°F. In addition, the relatively low initial cost of

plastic pumps and their ready availability, in contrast to the rising cost

and extended delivery time of metals, have made this choice more

significant than ever. Added emphasis on environmentally-friendly and

low-maintenance products has further accelerated the demand for

sealless, magnetically-driven thermoplastic pumps. Here are two

pertinent examples:

 

Harpeth Valley Water Treatment facility changed from a manual system,

using granular hydrated lime, to an automated liquid caustic

neutralization treatment system to reduce costs and achieve

environmental benefits. According to their plant superintendent, a

critical part of the new system involved two Vanton sealless

magnetically-driven pumps to transfer the corrosive caustic (25%

sodium hydroxide) from the 12,500 gallon storage tanks to a 500-gallon

day tank.

 

One reason for specifying sealless mag-drive pumps was to eliminate

any possibility for leakage. The engineers selected the Vanton pump

design because it was sealless, eliminating the need for mechanical

seals. The pump conformed with ANSI process pump specifications.

Vanton designs assure no metal components be in contact with the

fluid. The casing, casing cover and impeller were provided in

injection-molded, homogeneous polypropylene, and the inner portion

of the containment can of the mag-drive unit, the part in contact with the fluid, was made of polytetrafluoroethylene (PTFE).

 

As a result of the change from powdered lime to liquid caustic, there has

been noticeable improvement in environmental conditions, cleaner air

and happier employees and neighbors.

 

Beckman Coulter, Inc. is a major producer of clinical chemistry agents.

When they relocated their Puerto Rico plant to their plant in California,

they were determined to upgrade the sulfuric acid chemical feed system

to cope with changing environmental and workplace safety

requirements, and simultaneously secure higher productivity and

quality control. Their engineering department set these two pump

specifications:

 

1. Eliminate any possibility of metallic contamination of the reagents; all

fluid contact components were to be made of chemically inert

polypropylene or one of the fluoropolymers.

2. Eliminate any possibility of fluid leakage through emissions or

spillage; the transfer and circulating pumps were to be the latest

sealless, magnetically-driven designs confirming to ANSI B73.1 process

pump specifications.

 

In the Vanton CGM design, all fluid contact components are made of

solid, injection-molded virgin, homogeneous polypropylene. This is not

a lined pump. The inner magnet assembly is encapsulated in

polypropylene, and the large diameter stainless steel shaft is isolated

from the fluid by a PTFE Teflon assembly.

 

According to Jim Williams, Plant Engineering Manager, the Vanton

design eliminates the possibility of metal contamination of their high

quality product line, while reducing the chance of leakage so necessary

to meet proper health and safety standards.

 

Figure 3: Overview of compact installation showing six Vanton

Chem-Gard® Ansi end-suction polypropylene pumps recirculating acid

and alkaline solutions for an odor scrubbing system at a Florida waste

water treatment plant. The polypropylene material was perfectly suited

to handle the liquids, which had varying pH levels of 3-12. Pumps were

designed to deliver 650 GPM @ 38' TDH.

 

Figure 4: Two of eight Vanton PVC Sump-Gard® vertical pumps

employed at a water treatment plant in Arizona. Pumps were chosen

for their ability to handle different chemicals at varied concentrations

such as sulfuric acid, sodium hydroxide, alum, polymers and carbon

slurries. The average flow condition is 50 GPM @ 60' TDH.

 

Figure 5: Vanton Chem-Gard® magnetically-coupled sealless

polypropylene end suction centrifugal pumps transfer liquid caustic

from 12,500 gallon bulk storage tanks to 500 gallon day tanks at a water

treatment facility in Tennessee. These pumps are tied into a state of

the art computerized system, which eliminates manual labor, reduces

operating and reporting time and provides more accurate data. Service

conditions for these sealless mag-drive pumps are 55 GPM @ 30' TDH.

 

 

Figure 1.

Figure 2: View of 12,500-gallon tank with

Vanton CGM magnetically-coupled

polypropylene pump for handling sodium

hydroxide at 55 gpm against a 0 foot TDH.

Figure 3:

Figure 4:

Figure 5:

Copyright 2016 - Vanton Pumps (Europe) Ltd - All rights reserved

About Us

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.

 

 

Stay in touch

mail@vantonpump.com

(+44) 01260 277040

Vanton Pumps (Europe) Ltd.

Unit 4, Royle Park

Royle Street

Congleton CW12 1JJ

UNITED KINGDOM

www.vantonpump.com