Pump material and structure selections
How to select the modern food processing device pump fluid handling system, designers and these devices operators and managers faced with a variety of health responsibility, these responsibilities have exceeded the usual industrial product manufacturing range. Due to the end product consumer is public, product contamination must be avoid, corrosion is not allowed, pump and pipeline system can make fluid retention and bacterium caused cracks and blocking zone is unacceptable, in addition to the selection of materials and processing process food contact surface selection, food industry has to choose system maintenance, used to transport acidity and alkaline cleaning fluid pipes and storage equipment, and choose to satisfy various environmental standard use corrosive chemical to sewage treatment equipment.
Food application required pump, its manufacturing materials can't produce chemical reaction or in any way affect the product taste, color and other features. Non-food contact fluid equipment design factors include reducing maintenance and stopping time, increasing production and reducing cost, etc, and also has related with suppliers knowledge and services and other many difficult determined factors.
one usage causes another usage
People interest to plastic pump began more than 50 years ago, creating a Vanton flexible linear spiral shape rotary pump to satisfy the heart/pulmonary surgery in which has strict requirements of pump. This primitive pump unique and simple structure restricts flow contact with just two basic components: solid plastic pump body and rough synthetic rubber mold making lining. It has solved two major problems of pollution-free processing human blood or impact related blood. First, it avoids all dangerous metal contamination, because contact materials do not pollute the blood or produce chemical reaction. Secondly, it soft movement in blood in the process also does not damage blood cells. This pump is accepted by another reason is its simple structure. It does not contain valve, sealing, packing or gasket. Its remove cleaning and re-assembly is simple.
Thereafter, under the help of chemical materials manufacturers giants such as dupont, Doyle, Atofina and other chemical company, new fields have been exploited. They are exploiting used for handling corrosion chemicals: acid, alkali, salt, solvents and other large areas thermal plastic material go in front.
forward technology
Pump designers combine these new materials into cost-efficiency pump design, meet expanding processing industry needs. Today about 150,000 sets flexible linear pumps --- total capacity is 40GPM – used in the United States, in Europe about twice quantity is in use. In addition to need to use these hot plastic rotation screw pump in low flow to the shape of conditions from processing flow widespread sensitive and corrosive fluid, in order to handle chemicals, food, medicine, and relevant process and industrial enterprise required for higher conveying flow, nonmetal pump requirement is to adopt new structure. Pump manufacturers responded to this requirement
Daily products processing and its environment
In dairy products such as milk, butter, yogurt, ice cream, bean curd, juice and many sweets producting process, many used in washing equipment corrosive chemical processing in many ways similar to the whole industry to these chemicals processing. Purge the air or the local water system or waste water system of dirt shall be consistent with the environmental specification, pay attention to this point is also very important. These requirements must carefully select the structure and manufacturing materials to ensure that these pump can resist fluid corrosion and abrasion, and the fluid after use can be completely discharge, it also ensures not pollute the disposal food after cleaning.
Tuscan Dairies is an American larger districts dairy processors, demanding cleaning after daily production. Tuscan standard step requirements washing fluid handling system and dismantling, cleaning, reinstall the used requipment. This process by use of alkali and acid solution and various chemicals in liquid flows into wastewater treatment system and speed up. The flexible linear pump is very suitable for the various chemicals transported to storage tanks and give them from these tanks team-record off. Synthetic rubber material that can be used for the lining has 7 kinds, can be used in the pump body materials have four kinds.
A modern dairy factory in Scotland in compliance with local water agency requirements facing various issues. These problems have arisen because the wastewater treatment system has rare sulfuric acid injection to help nullify milk/wastewater condense. The liquid pH value adjustment and control requirement is very strict. British process design company Steill is so to solve this dairy factory problem:
In order to guarantee the chemical corrosion thoroughly resistance, all contact fluid pumps parts use homogeneous PP, because pH range that does not produce chemical reaction is very large.
To water/milk and sulphuric acid treatment, request pump can satisfy Vanton vertical centrifugal pumps Sump - Gard regulation, this pump are hot plastic drainage stand pipe and has had the same material to strengthen the bar. Pump shell, shell cover and impeller is made by pure PP mould. Heavy bearings include ceramic inner sleeve and Teflon or ceramic outside sleeve. Stainless steel shaft sleeve uses the same materials.
To treated wastewater, the pump's requirement is to satisfy Vanton vertical centrifugal pump Sump - Gard regulation, this pump shell, shell cover, flange and impeller is made by homogeneous PP, drive bearing seat open seal area is so big, and a simplified servicing, and there is a collapsible front bearing in order to make the overhang part and deformation to a minimum.
Thermal plastic centrifugal pump design currently can obtain forms are horizontal and vertical structure, and can be used in the flow of 1500GPM and head of 400ft in temperature of 275 °F or slightly taller can continuously or intermittently use. They can to meet ANSI standard model of the process pump decorate, can decorate in electromagnetic drive encapsulated institutions and automatic startup devices. Vertical pumps have dry run ability, and has a unique piecewise shaft structure the allowed length is 50ft. All of these types can be used in food industry, because its design and structure without metal components contact fluid.
typical application
Sticky mustard and vinegar
The flexible linear spiral shape rotary pump allow it handles clarity and 6000SSU viscous fluid, silt oar and have small particles uniform fluid. In this device, vinegar stores as ground level, then use pump to throw into floor above tank. Then it inflows ingredients cans because gravity, adding mustard seed and salt in ingredients tank. These mixed ingredients into a mixing/mixed cans, manufactured mustard products are pumped into a hopper and load to the moving conveyed belt in the bottle.
August Barer & Sons company installed pump requires under 50PSI pressure and viscosity of 5000SSU conditions can process flow is 10GPM. Only two parts contact corrosive fluids. They are all plastic. Thicker part of PP pump body life is infinite, because it does not react with food and its smooth internal also reduce wear. Synthetic rubber flexible lining is also not react with food happening but lining wrinkle will take out part of products, especially fluid containing grinding powder. The company provides a service report said, processing vinegar pump only needs to replace a liner in its first 20 years operation. Although processing sticky mustard pump need to be replaced lining at fixed period and plan. This job can be finished on the spot in a few minutes without using special tools.
