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TL-129

 

At Dyno Nobel, nitroglycerinecontaminated

wastewater is collected in

outdoor sumps, which are sealed and

equipped with Vanton polypropylene sump

pumps. To minimize potential explosion

risks from accumulated nitroglycerine,

the pumps have been customized to ensure

complete drainage of the hazardous fluid

when the pump is removed for maintenance.

Three Sump Pumps

Survive 18 Years of

Corrosive Service

INDUSTRY:

ENTITY:

SOLUTION(S) PUMPED:

PUMP TYPE(S):

Wastewater Industrial

Dyno Nobel

Nitric acid, Sulfuric acid, Glycerine

SUMP-GARD Thermoplastic Vertical Pump

 

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Reprinted from CHEMICAL ENGINEERING

 

Submerged in acidic wastewater for years, these

polypropylene pumps are still thriving

 

When estimating the potential life of severe-service process pumps,

design engineers often think in terms of years, not decades. Back in

1977, Dyno Nobel (Carthage, Mo.) — owner of the last remaining

dynamite plant in North America — selected sump pumps to handle the

acidic wastewater from its nitroglycerine manufacturing facility, the firm

opted for pumps constructed of thermoplastic rather than metal. After

nearly two decades of continuous service, the three plastic pumps from

Vanton Pump & Equipment Corp. (Hillside, NJ) continue to function as

expected and to date, they have required no major repairs or

replacement.

 

The Dyno Nobel facility produces nitroglycerine using the traditional raw

materials of nitric acid, glycerine and sulfuric acid. The wastewater

from the manufacturing process contains small amounts of these raw

materials, as well as traces of nitroglycerine, a powerful explosive. This

corrosive wastewater drains to sealed, outdoor sump tanks. From

there, it is pumped to the facility's wastewater-treatment system.

The three Vanton pumps handling the acidic wastewater in the sumps

are constructed entirely of virgin polypropylene. Each pump has a

capacity of 50 gpm at 120 ft head, and is driven by a 7.5-hp, 3,600-rpm

motor.

 

Aside from the motors, which are installed on top of the sump cover, the

majority of each pump's body, including the polypropylene support

column, is house inside the sump, with the impeller and casing

continuously submerged in the corrosive wastewater. The 5.6-in.-dia

impeller on each pump is driven by a 36-in.-long shaft. The shaft is

constructed of stainless steel to ensure adequate stiffness, but it is

isolated from contact with the wastewater by a polypropylene sleeve,

which is welded to the impeller. The sleeve bearings are made of

reinforced polytetrafluoroethylene, or Teflon. All other wetted parts are

constructed of solid, homogeneous virgin polypropylene.

 

The polypropylene construction provides two important benefits in this

application. First the material is inert to chemical attack by the nitric and

sulfuric acids in the wastewater. In addition, the smooth, crevice-free

surface of this thermoplastic pump reduces the potential for small

amounts of waste nitroglycerine to accumulate in the pump. This

minimizes the risk of potential explosion when the pumps are removed

for inspection or maintenance. Any nitroglycerine remaining in the

pump could create a hazard for maintenance workers.

 

To further reduce potential hazards during pump maintenance and

inspection, all sections of the pump casing that could retain fluid have had notches or drain holes cut. This guarantees that when the pump is

lifted out of the sump, all liquid — including trace amounts of

nitroglycerine — drains out of the casing and stays in the sump. Even

the Teflon sleeve bearing has been customized with spiral grooves to

facilitate drainage.

 

These pumps operate in an of-off mode, based on wastewater levels in

the individual sumps, and they move this aggressive waste to the onsite

treatment plant 24 h/d, seven days per week. Despite continuous

exposure to acidic waste, these pumps have flourished for more than 18

years, requiring limited, routine maintenance.

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