Rino Peristaltic 100327000703 Phpapp01

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RINORAJ

P7- 457,

SCTCE.

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INDEX

1. INTRODUCTION2. DESCRIPTION OF PUMP

3. WORKING OF PUMP

4. TYPE OF PUMPS

5. TUBE SELECTION FACTORS

6. TUBING MATERIALS

7. ADVANTAGES & DISADVANTAGES

8. APPLICATIONS9. CONCLUTION

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INTRODUCTION

1. Peristaltic pump is a positive displacement pump, used

for a variety of fluids.

2. Fluids include a wide range of viscous materials that

cannot be pumped by common pumps.

3. Fluids flow through a flexible tube fitted inside a circular

casing.

4. The casing has a central rotor on which a number of

rollers or shoes are attached.

5. The rollers push the fluids through the tube by physically

compressing the tube.

6. The rollers does not come in direct contact with the fluid,

and so it is used where fluids should be clean and cross

contamination should not occur.

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WORKING OF PUMP

Priming should be done. Fluid enters the casing cavity via tubing.

There are rollers inside the tubing attached on the central

spindle. These spindles are rotated by suitable motors.

The rollers are under squeezing contact with the peristaltictubing.

The fluid that enters the tubing are physically pushed or

squeezed away by the roller, towards the outlet.

The rate of fluid flow can be increased by increasing theroller rotary speed.

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ANIMATIC REPRESENTATION 3Decem

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TYPES OF PERISTALTIC PUMP

1) HOSE PUMP

Hose pumps work under high pressure, up to 10 bars.

Casing and rollers are filled with lubricant to prevent

abrasion and to dissipate heat. Reinforced tubes called hoses are used and hence the

name hose pump.

2) TUBE PUMP

Low pressure type

Casing and rollers are dry and use non-reinforced tube.

work below 5bars.

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3) 360 DEGREE ECCENTRIC DESIGN

The casing has a full 360 degree inner cavity

There is only one roller fitted on an eccentricallyarranged shaft, compressing a low friction tube.

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BENEFITS OF 360DESIGN

More flow per revolution

Only one compression and expansion per cycle

At similar performance points this design pump

runs more slowly, thus longer tube life can beachieved , than pumps with multiple shoes or

rollers.

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TUBE SELECTION FACTORS

Peristaltic pump is increasing in popularity because of itscontamination free fluid transfer . Each application has its owntype of tube material. So when designing, tube materialselection, is an important factor. The factors are

1) Chemical compatibility

2) Pressure3) Temperature

4) Dimension

5) Tolerance

6) Life expectancy

7) Gas permeability

8) Transparency

9) Regulatory approval

10) Cost

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1) Chemical compatibility

Tubing material should be compatible with the fluid

chemistry.

There are compatibility charts created by manufacturers.

Even if one tube material is chemically compatible

sometimes it may not be withstand the stresses created

by the rollers.

If not compatible, it may cause failure and leakage.

Even trace amounts of some acids can cause failure,

though the main ingredient does not.

To check the compatibility immersion test is done.

Poly-tetra-fluoro-ethylene(PTFE) is a material that can

withstand may known industrial chemicals.

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2) Pressure

Pump applications can be limited by the pressure

capabilities of the tubing.

Typical pressure ranges are 1bar and 5bar.

Silicone is the material with the lowest pressure working

capabilities and Neoprene with the highest.

Recently developed materials can stand up to 10bars. While designing the engineer should ensure that the

average pressure in the system does not exceed the

working pressure in the tube, or else there is a chance of

rupture or leakage.

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3) Temperature

Chemical fluids may not have any effect on tubing at

room temperatures.

At high or elevated temperatures the chemicals can

attack the tubing material.

So the compatibility of the tubing at varying

temperatures should be noticed.

The type of chemicals that pass through and its effects on

varying temperature should be studied and a suitable

tubing material should be selected from the charts.

Silicone is a typical material that can work on broad

temperature differences.

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4) Dimensions

Size of the tubing is directly proportional to the rate of

flow. The wall thickness determines the ability of the tube to

spring back to its original shape (elasticity).

Undersized tubes may lead in insufficient flow since the

rollers do not come in close contact with the tube. If an Oversize tube is used the excess material can get

pinched between the rollers and cause premature failure.

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5) Tolerance

Tolerance measures variance in dimensions. Close

tolerance-give better performance i.e. greater

compatibility and repeatability. Great tolerance cause

unpredictability.

6)

Tubing life expectancy Material with longer life, is economical, in long run.

Engineers should know the life span of a given material.

This knowledge help in taking preventive measures , or

calculating maintenance time to replace tubing before itfails.

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7) Transparency

Decides whether fluid should be seen. If the fluid is sensitive

to light opaque tubing material should be selected.

If transparent we can detect the absence of flow, Presence of

air bubbles, particulates or contaminants in the tubing.

Materials like Tygon or Silicone are used for transparent

tubing.

8) Gas permeability For gas sensitive liquids, the tubing material should be least

permeable to gases to prevent oxidation and cell culture.

Silicone is a highly permeable material while thermoplastics

are impermeable and so used.

A less permeable material will prevent problems associated

with exposing fluid to air.

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9) Regulatory approval

The final tube product (pharmaceutical applications) should

be inspected for specific standards and guidelines.

Some of approval associations are United states

pharmacopoeia (USP) , European pharmacopoeia (EP), US

food and drug administration (FDA), National sanitation

foundation (NSF).

10) Cost Cost is an last but not least factor of tube selection.

Selecting a cheap material is not economical as its life span

may be low and material with great life might be costly. So

selecting the right material with least loss is essential.

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TUBING MATERIALS

There are several material now availablefor tubing they are

1. MARPRENE

Marprene is a thermoplastic material. It is an exclusive

product made by the Watson-Marlow Bredels tubemanufacturing company. Its features are

wide chemical compatibility, resistant to oxidizing agents

like ozone compounds.

Opaque to visible and ultra-violet rays Has low permeability to gases like oxygen , carbon dioxide

and nitrogen

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2. BIOPRENE

Bioprene offer similar benefits as marprene

Bioprene has longer life span

It can handle fluid temperatures upto 80 degrees

Bioprene can be sterilized with ethylene oxide or gamma

irradiations.

3) SILICONE

Is the widely used laboratory tubing.

Mainly used for small tubing bore ( upto 9.6mm).

Platinum-curing is provided to prevent contamination to the

fluid.

This material is used in medical devices,

chemical analysis etc.

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4) NEOPRENE

Useful for abrasive slurries

Sustained pressure applications

bore sizes above 12.6mm

As neoprene has a greater permeability, marprene is

mostly used.

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ADVANTAGES & DISADVANTAGES

ADVANTAGESNon contamination

Inexpensive to manufacture

Low maintenance

Easy to sterilize

Cost effective operation

DISADVANTAGES

operator need good knowledge.

Selection of tubes for the required purposes can be

sometimes difficult.

Tube life is limited.

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APPLICATIONS OF PERISTALTIC

PUMP

Dialysis machine

Open-heart by pass machines

Sewage sludge

Analytical chemistry experiments Food manufacturing industries

Pharmaceutical production

Construction-pumping cement

Pulp and paper industries

Aquariums ; etc.

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CONCLUTION

Peristaltic pumps have become a critical and

reliable part of processes ranging from chemical

transfer to pharmaceutical processing to

wastewater treatment. Their versatility and easeof use has helped them meet a multitude of fluid-

handling challenges.

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REFFERENCE

www.peristalticpump.info

www.wikipedia.com

www.vectorpumps.com

www.lplc.com

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Rino Peristaltic 100327000703 Phpapp01

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