Views: 0 Author: Site Editor Publish Time: 2021-01-07 Origin: Site
No one article can explain the entire world of process piping and fittings. This article will try to take a look at the world of sanitary pipe fittings. Sanitary process pipes and fittings (also known as sanitary pipe fittings or high purity pipes) are used almost exclusively in the food, beverage, biopharmaceutical and personal care industries.
This passage is going to talk about the following introductions of sanitary pipe fittings:
1) Sanitary pipe fittings will vary from material to material
2) Different types of sanitary pipe fittings
3) Which type to choose?
Material is an important factor in the selection of sanitary fittings. Fitting materials considered "sanitary" must be sterilizable and able to withstand repeated exposure to high temperature steam, high pressure and strong chemicals. Fittings must also be compatible with the material of the container (tube, pipe or hose) to which they are attached. Typically, this means that the fitting material matches the material used for the vessel, especially in the case of metals.
Stainless steel is a steel alloy with a minimum chromium content of 10.5%, which provides excellent corrosion resistance and antibacterial properties compared to standard steel, allowing it to withstand rigorous cleaning and sanitation without rusting or deterioration. It also has strength and hardness properties similar to those of other steel alloys. In sanitary applications, stainless steel is the most common material used for sanitary pipe fittings.
Polytetrafluoroethylene (PTFE) is a fluorocarbon-based polymer. It has high chemical resistance, weather resistance, low friction, electrical and thermal insulation, and "slip" properties. Compared to other plastics, PTFE has low mechanical properties but remains useful over a wide temperature range of -100°F to + 400°F (-73°C to 204°C). Mechanical properties are often enhanced by the addition of fillers. It is often the best choice for sanitary pipe fitting applications involving highly corrosive fluids such as hydrochloric acid.
Polyvinylidene fluoride (PVDF) is a fluoropolymer. The maximum recommended continuous use temperature is 150°C (302°F). It has excellent mechanical strength and toughness, stiffness, high dielectric strength, abrasion resistance, creep resistance, high purity, chemical inertness, low flammability, and low moisture absorption. These properties make PVDF a preferred mimetic material for applications in the semiconductor and chemical processing industries.
Polypropylene is a thermoplastic material with excellent cold flow, biaxial strength and yield elongation properties. It is similar to PVC but can be used in exposed sanitary pipe fitting applications due to its UV resistance, weatherability and ozone resistance.
Sanitary fittings (also categorized as sanitary tubing) were developed and used because they are cleanable; they can be cleaned by disassembling the system and manually, or by using the CIP (clean-in-place) process. They limit areas of entrapment where bacteria may form or harbor. They are also corrosion resistant.
These can have welded, clamped and threaded connections. The most popular standards.
All sanitary piping is measured by the outside diameter of the pipe. If you are holding a sanitary fitting in your hand, measure the outside diameter of the pipe section of that fitting. This is the correct size, not the size of the face of the end fitting.
You can buy fittings and tubes in sizes from 1/2 to 12" (DN10-DN300). Sizes 1/2"-12" (DN10-DN300) are the most common sizes.
Size 1/2"-3" has a wall thickness of 0.065" (16 Ga) or 1.5 mm for DN10-DN50, while SMS has different standards of 1.25 mm-1.6 mm.
Wall thickness is 0.083" (14Ga) for 4" and 2mm for DN65 and above.
Most sanitary fittings are 304 or 316L stainless steel. More noble alloys, such as AL6XN, titanium and Hastelloy, are available in limited quantities and sizes.
The quality of the surface treatment is classified by Ra. These have many different requirements in different countries. Some call it unpolished, matte, satin, mirror polished and electropolished. The surface is very different from Ra32-1.
Bathroom fittings do not vary much in radius. More of an elbow is available in 1.5 radius, 1D radius and DIN sanitary types.
The most common sanitary fitting end connection products are butt welds and sanitary clamps. A sanitary clamp fitting consists of two gender-neutral fittings with a sanitary gasket in between, all joined together by a clamp.