Sanitary pumps are mainly used for filling, emptying, batching, and mixing. Besides that, it is used to transfer process fluid from equipment such as membrane filters. At present, the sanitary pump industry is relatively mature, and the main manufacturers of such pumps include Alfalaval, Bominox, CSF, SPX, Grundfos, and so on.

There are many types of sanitary pumps, which are determined by the diversity of the media they deliver. From clean straight drinking water to milk and jam, these materials are acidic, alkaline, easy, or hard to flow. The main types of sanitary pumps are centrifugal pumps, CAM pumps, single-screw pumps, and peristaltic pumps, and their design methods are largely the same but not exactly the same as ordinary pumps. Taking the centrifugal pump as an example, the following points need to be paid attention to are briefly explained.

There is no blind Angle in the flow

In the food production process, the medium in contact with the pump needs to be flowing. However, the mechanical seal cavity in the normal pump is usually a dead Angle, and the open or conical seal cavity is required.

Weld surface roughness

The surface roughness of the weld shall be 3.2, and the general surface shall be 0.8, that is to say, the pump body flow channel and the impeller flow channel need to be polished. It is difficult for ordinary cast parts to meet this requirement, so the centrifugal sanitary pump generally adopts the stamping and welding structure. Sometimes, the impeller is open or half-open.

Meet the CIP requirements

Most production lines need to be flushed once a day to remove residue that can deteriorate and cause bacteria, while many use clean water for a period of pumping or backwashing. In a flush time period, the slow flow of the medium (such as the sealing cavity of the material) should all flow out.

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Generally, the packing of a sanitary pump fails for two reasons: normal deterioration and improper usage (usually considered as premature failure).

Normal Deterioration

Packing is designed to wear and tear due to pressure and lubricant consumption. With normal usage, a portion of lubricant in the packing material would lose. This is normal and is expected.

Premature Failure

Premature failure refers to that a packing stops working within the expected lifetime. For sanitary pumps, good packing conditions are an important factor to ensure the product’s quality. It is the right issue that deserves enough attention when selecting s packing and operating a pump.

There are four main causes of premature packing failure:

• Improper selection of packing materials or sizes. This can be solved only by checking with the manufacturer.
• An excessive amount of abrasive materials entering the stuffing box from the pumped fluid or not removed by the flushing action of the seal water.
• Pump runout, vibration, or other similar conditions caused by bad bearings, worn or damaged shaft, loose base bolts, misalignment, imbalanced motor, etc.
• Seal water shortage or packing lubricant loss, which will cause the packing to burn and thus be destroyed.

With regard to the premature lubricant loss, it is possible to be caused by the excessive pressure exerted on the stuffing box. When pumping at high pressure, it is necessary to apply considerable pressure on the packing. However, this need can be alleviated by reducing the pressure differential between the stuffing box and the atmosphere.

How to make it? Just installing a bypass line with a throttling valve in the seal water line and exiting this line to the atmosphere will be enough. By adjusting the throttling valve you can regulate the stuffing box leakage and extend the packing life.

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Sanitary pumps are specialized equipment used to pump hygienic liquids and slurries through industrial processing pipeline systems. A sanitary pump is a critical agent in the transportation of products meant for human consumption or contact, such as pharmaceuticals, dairy products, beverages, food, cosmetics, food additives, fine chemicals, and so on.

What Makes a Pump Sanitary?

We all know that pumps are mechanical devices that provide conveyance power to move fluids through pipes and hoses. But what qualities must a pump have to be considered a “sanitary pump?” Well, for a pump to be considered sanitary, all components that contact the fluid medium must be made of materials with hygienic properties. Sanitary pumps must remain sterile to prevent contaminating the liquid products inside them. Corrosion resistance is critical, so sanitary pumps are made with non-corroding materials. In terms of industry standards, sanitary pumps must be certified as American 3A or European EHEDG, and the materials must meet FDA standards.

What are the different types of Sanitary Pumps?

There are four basic types of sanitary pumps: centrifugal, volumetric, jet, and airlift. Centrifugal pumps use centrifugal force to generate speed and use a rotating impeller to increase speed and push fluid through the outlet valve. Positive displacement pumps use rollers, gears, or impellers to move fluid into a fixed cavity so that when liquid exists, the vacuum created draws in more fluid. Jet pumps force fluid through a nozzle, converting the fluid’s energy into velocity energy. Airlift pumps mix air or gas with the liquid media so that the air-liquid mixture, with a lower specific weight than the liquid, rises in the pipe and is discharged above the liquid level.

which pumps are considered sanitary pumps?

What Materials are Sanitary Pumps Made of?

Sanitary pumps must be made of hygienic materials with corrosion-resistant properties. Most sanitary pumps are made of 316L stainless steel, copper, or bronze. Also, sanitary pumps cannot have a dead angle in the pump chamber. The sealing material must be food-grade, such as nitrile rubber, fluorine rubber, ethylene-propylene rubber, Teflon, and so on. The type of pump can be a centrifugal pump, rotor pump, self-priming pump, shear pump, screw pump, etc. As long as the above requirements are met, the pump can be considered sanitary.

What does a Sanitary Pump Do?

Some popular types of sanitary pumps common today are centrifugal beverage pumps, milk pumps, and stainless steel beverage pumps. These are suitable for conveying milk and other similar colloid liquids. Nowadays, sanitary pumps are used in a variety of commercial and industrial applications. Examples include agriculture and horticulture, brewery and distillery, dairy, food processing, food service, medical, municipal, OEM supply, pharmaceutical, and biotechnology applications.

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Pumps run through many energy sources, including manual operation, electricity, motors, or wind power, and are available in many sizes, from microscopic for use in medical applications to large pumps industrial.

Mechanical pumps serve in a wide range of applications such as pumping water from wells, aquarium filtering, pond filtering, and aeration, in the car industry for water-cooling and fuel injection, in the energy industry for pumping oil and natural gas or for operating cooling towers. In the medical industry, pumps are used for biochemical processes in developing and manufacturing medicine, and as artificial replacements for body parts, in particular the artificial heart and penile prosthesis. When used in fields requiring high health levels, the pumps are generally called sanitary pumps.

Single-stage pump refers to a casing containing only one revolving impeller. The double or multi-stage pump then means a casing contains two or more revolving impellers. In biology, many different types of chemical and bio-mechanical pumps have evolved, and biomimicry is sometimes used in developing new types of mechanical pumps.

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At present, there are advanced materials companies using porous silicon carbide (SiC) to produce a new microporous structure, which can extend the working time of the pump by the effective pore-making method.

The porous sealing ring is crucial to the durability of the sanitary pump. Companies making fast-moving consumer goods (FMCG) must ensure the integrity of the sealing ring and not allow any pollution. When two mechanical seals collide, friction will occur naturally, which will affect the sealing performance of the seals and may lead to liquid leakage over time.

The pores of the seals can act as pockets of the treatment fluid, so improving the porosity can solve this problem. The most popular industry solution on the market today is to use a liquid as a lubricant to greatly reduce friction, but this approach is not environmentally friendly.

So far, the solution is to use polymer microbeads to create the microstructures needed to reduce friction. As stated in a Commons briefing in January 2017, research has confirmed that polymer microbeads are harmful to Marine life.

The UK and U.S governments have banned the use of polymer microbeads in certain industries, which are mainly cosmetics. However, the ban is likely to spread to other industries.

The ban poses significant risks to the supply chain of health pump manufacturers. However, there are advanced materials companies that have introduced a new material that has properties that are very similar to current solution principles but do not cause similar pollution to the environment.

The new porous silicon carbide makes the customer’s sanitary pump more durable and can be tightly joined and lubricated during operation. Actually, the new porous silicon carbide provides interspaced pores on the sealing surface that can act as “pockets” to retain the treatment fluid for lubrication, and the graphite type dry lubrication system is very practical for the food or the pharmaceutical field since it avoids the environmental pollution.

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Unplanned maintenance is often one of the most important property costs, and failures of mechanical seals and bearings are among the main causes. Keep in mind the potential value of choosing pumps that are more expensive initially, but last much longer between repairs.

The MTBF of a better pump can be one to four years longer than that of its unimproved counterpart. Consider that the published average values ​​of avoided pump failures range from US $ 2,600 to US $ 12,000. This does not include opportunity costs lost. A pump fire occurs by 1000 failures. Having fewer pump outages means less destructive pumping fires.

As we have seen, a typical pump failure, based on 2002 reports, costs an average of US $ 5,000. This includes the costs of equipment, parts, labor, and overhead. The MTBF extension of a 12- to 18-month pump would save the US $ 1,667 per year, which could be greater than the cost of improving the reliability of the centrifugal sanitary pump.

How To Maintain Your Sanitary Pump?

1. Clean and prepare the pump.
2. Check the oil.
3. Inspect pump impeller.
4. Tighten connecting elements.
5. Assess bearing damage.
6. Ensure your seals remain tight.
7. Clean your vents.

Conclusion

Thank you for reading our article and we hope it can help you better understand the maintenance of the sanitary pump. If you want to learn more about the maintenance of the sanitary pump, we would like to advise you to visit Adamant Valve homepage for more information.

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Volumetric sanitary pumps, in which its operating principle is based on hydrostatics, the increase in pressure is made by the thrust of the walls of the chambers that vary their volume. In this type of pump, in each cycle, the propeller organ positively generates a given volume or displacement. In the case of being able to vary the maximum volume of the displacement, we are talking about variable volume pumps. If that volume cannot be varied, then it is said that the pump is of fixed volume. In turn, these types of sanitary pumps can be subdivided into:

1. Alternative piston pumps, in which there are one or several fixed compartments, but of variable volume, by the action of a piston or a membrane. In these machines, the movement of the fluid is discontinuous and the processes of loading and unloading are carried out by valves that open and close alternately. Some examples of this type of pump are the reciprocating piston pump, the rotary piston pump, or the axially operated piston pump.

2. Rotary or roto-static volumetric pumps, in which a fluid mass is confined in one or several compartments that move from the entrance area (low pressure) to the exit zone (high pressure) of the machine. Examples of such machines are the vane pump, the pump lobes, the gear pump, the screw pump, or the peristaltic pump.

Conclusion

Thank you for reading our article and we hope it can help you better understand the volumetric sanitary pump classification. If you want to learn more about the volumetric sanitary pump, we would like to advise you to visit Adamant Valve homepage for more information.

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Sanitary pumps are designed to handle products related to the pharmaceutical, cosmetic, health, dairy and food industries. These industries are generally based on equipment that can be easily and quickly cleaned or sterilized at regular intervals. This ensures that no product contamination occurs. Such products may include liquids that dry quickly or form films, different colors or other variable liquids. This sanitary pump design makes it ideal for aseptic applications.

What are the Benefits of Applying Sanitary Pumps?

An advantage of these pumps is that the parts that come in contact with the liquids are made of stainless steel. The pump can easily be disassembled for sterilization or cleaning. Pump components such as bearings and seals are less vulnerable to wear due to friction. This means that apart from some unique components that may require replacement or repair, they usually require less maintenance. Their high-end components and simplicity of design minimize maintenance requirements.

In addition to their innovative design, the pumps are very competitive. Their quality is unassailable as they are considered one of the most modern pumps on the market. They are worth every penny spent on them. The pumps are very flexible in terms of sizes and specifications. This makes them affordable because their prices are determined by the specific needs of the customer.

The operation of the pump produces very low noise levels. This makes it ideal for environments that require minimal disruption. These may include health centers, etc. The pumps are also approved by the EHEDG. Their operation is very profitable depending on their size. Low flow rates and high performance are possible even in small pumps. The pumps allow precise flow over small repetitive quantities. Non-pulsed flow also allows sensitive applications. Sanitary pumps are capable of self-priming.

Some models offer pumping without contamination using additional features. These features include hose pumps and peristaltic tubes. Other features include retractable shoes that allow you to clean equipment in place (CIP). Models designed for CIP operations include those for food bottling, dairies, packaging and pharmaceuticals. These allow the models to improve their productivity while reducing operational costs.

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Straight Lengths of tubes

It is of great importance to have 4-6 tube diameters of inlet tubing that is straight into the pump when installing a sanitary pump. The continuous length of the inlet enables the flow to be laminar into the pump. Preventing turbulent, choppy flow increases air entrainment. This further reduces the chances of pump cavitation. Cavitation is a major destroyer of the efficiency of pumps in PD and sanitary centrifugal pump applications. Smooth flow with fewer transitions results in better performance of pumps.

Piping Support

Sanitary tubing becomes very heavy when filled with fluid. 10 feet of 3” sanitary pipe holds about 4 gallons of fluid, in this example, water. That totals up to a weight of about 33 pounds. Such a weight is too much to hang off the pump’s end. Distribution of the weight and strain evenly is therefore necessary.  This is done using hangers or other means of support. This weight can misalign the pump shafts and the motor. The result is a shaft deflection and a terrible pump failure. Excessive strain can break the seals in the system and allow air into the process.

Piping Slope

There are three reasons why the piping slope is important. First of all, it helps in the drainage of the systems when a cleaning cycle is run. Secondly, it prevents pockets of air in the suction line. Lastly, when the fluid mixes with air, it leads to cavitation and loss of efficiency of the pump.  It is therefore important to slope piping in an upward manner on the inlet side of the pump, and reduce points where air can accumulate.

Strainers and Traps

Strainers and traps protect both the pump and the product. Inlet side traps and strainers can prevent damage to the pump by foreign matter. Clogging of the pump inlet can lead to flow stoppage and cavitation.

Pressure Gauges

Discharge and inlet gauges help in diagnosing and identifying problems with the pump. Gauges are the most convenient way to identify changes in product, system, or pump condition. The following are the three common types of valves in a good set-up of a pump:

• Check or foot valves – are located on the inlet. They ensure the maintenance of a liquid leg on the side of the pump that sucks. Sanitary check valves prevent backflow and keep the pump primed.
• Relief valves – protect the piping system from excessive pressure
• Isolation valves – allows for the safe removal of the pump from the piping system and maintenance of the system without having to empty the entire pipeline.

Conclusion

In conclusion, the installation of sanitary pumps in an application has many factors that need considering. First of all, the pump to be used needs to be identified by Identification of the best technology to be used, selection of the motor and drive, and many more. This leads to a successful choice and installation of the pump in a system in the best way possible.

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1. Flavorings and food additives- These may include pumps that are used in restaurants to dispense an array of foodstuffs. The pumps can handle a wide range of products. These range from clear fluids, and clean liquids to abrasive fluids.
2. Food dispensing- examples of food that can be dispensed include ice cream.
3. Dairy products- These include creams, etc.
4. Filling machines- These may include soda refill machines.
5. Cart mounted transfer- These may be used by street food vendors.
6. Cosmetics and pharmaceuticals.

One advantage of these pumps is that those parts that come into contact with liquids are made of stainless steel. The pump can easily be disassembled for sterilization or cleaning purposes. The pump components such as bearings and seals are less vulnerable to wear due to friction. This means that apart from some unique components that may need replacement or repair, they generally require less maintenance. Their premium components and simplicity in design minimize maintenance requirements.

Apart from their innovative design, the pumps are very competitively priced. Their quality is unassailable because they are regarded as some of the most modern pumps on the market. They are worth every penny spent on them.

The pumps are very flexible in terms of their sizes and specifications. This makes them affordable because their prices are determined by the specific needs of the client. The pump operation produces very low noise levels. This makes it ideal for environments that require minimal disturbances. These may include health care centers etc.

The pumps are also EHEDG-approved. Their operation is very cost-effective depending on their sizes. Low flows and high performance are possible even in small-sized pumps. The pumps allow for accurate flow on small repetitive quantities. The non-pulsating flow also allows for applications that are shear sensitive. The sanitary pumps are capable of self-priming.

The sanitary pumps are available in models that are cost-effective. These include cost-saving hygienic models. Other models include Close Coupled models and Bare Shaft. Temperature specifications for sanitary pumps range from 240 degrees Fahrenheit. They can withstand pressures of up to 150 psi. Their holding capacities range from 0.2 to 15 gpm.

Some models provide contamination-free pumping using additional features. These features include hose pumps and peristaltic tubes. Other features include retractable shoes that allow the equipment to be cleaned in place (CIP).

Models that are designed for CIP operations include those meant for food bottling, dairy plants, packaging, and pharmaceutical. These allow the models to improve their productivity while lowering operational costs.

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