কোন Fluid এ কোন Pipe লাগবে?

Pipe দিয়ে যে Liquid Flow হবে তা কি Corrosive নাকি Non-Corrosive?

Corrosive Liquid এর মধ্যে রয়েছে Crude Oil, Ammonia, Sea Water এবং অন্যান্য Acidic Liquids. এই ধরণের liquid প্রবাহের ক্ষেত্রে corrosion-resistant pipe material প্রয়োজন যেমনঃ Plastic, cPVC Pipe কিংবা lined pipe. অন্যদিকে Non-Corrosive Fluids অথবা Gases যেমন Lube Oil, Air এবং Nitrogen নিরাপদেই Carbon Steel বা Metal Pipelining মধ্য দিয়েই সরবরাহ করা যায়।

The type of liquid or gas your pipe system transports plays a significant role in choosing fluid handling pipe material. Some pipe materials are better suited for non-corrosive liquids, like oils or standard wastewater. More corrosive liquids, like acid or peroxide, require a pipe with an interior that can hold up to the abrasiveness of these corrosive materials. Corrosive materials are common in many industrial cleaning solutions, as well as in chemical manufacturing and handling. Remember, despite a plastic or metal pipe material’s durability and corrosion resistance, chemicals, acids and saltwater are much more abrasive than standard water or oil. Always keep the liquid you are transporting in mind when selecting a pipe material.

Take a look at how the following popular pipe and pipe lining materials stand up to corrosion:

•             Stainless steel: It’s called “stainless” steel for a reason — stainless steel does not rust or corrode as quickly or easily as other materials. It naturally resists most corrosion because it consists of several different alloys, all of which help form a protective oxide layer on the surface. This natural layer is tough and durable. For this reason, it is an ideal water pipe material selection that is also suitable for oils and some chemicals.

•             Aluminum alloy: Aluminum does not rust, which is useful when you need your transported liquid to remain pure and uncontaminated. It can handle exposure to many gases, oils and liquids without deteriorating. However, aluminum does corrode over time, especially in saltwater or sulfuric applications.

•             Cast iron: Cast iron is easy to find and is uniquely durable against many external sources of corrosion, like plant growth and soil, because it is so thick. Cast iron can withstand water and saltwater for short periods, so it could be suitable for short-term projects. However, it does corrode and rust after prolonged water exposure.

•             Fluoropolymer (PTFE) lining: PTFE pipe lining is non-reactive and very resistant against corrosive chemicals. It is one of the most universally applicable pipe lining materials, and thanks to its durability and zero-risk of product contamination, it is the perfect acid, water, chemical and oil pipe material selection.

•             PVDF Kynar® lining: PVDF pipe lining is very durable and strong, and is one of the most abrasion-resistance materials on the market. Manufacturing facilities or plants that handle high-strength acids, chemicals, saltwater and nuclear materials find success with PVDF lining. It also resists corrosion from natural sunlight and weathering.

•             Galvanized steel: For short-term saltwater projects, galvanized steel is a suitable pipe material, as it does not rust. However, it will corrode after prolonged exposure to both salt and water. Also worth noting is that galvanized steel often corrodes from the inside out, so it may be challenging to detect.

•             Copper: Copper is widely used due to its ready availability and aesthetic appeal. It is not completely immune to corrosion, but it is more corrosion resistant than many other materials, such as galvanized steel. Copper is most prone to corrosion in fresh and saltwater, as well as particularly harsh chemicals and acids.

•             Resistoflex ATL PTFE lining: ATL PTFE pipe lining contains specially formulated resins that make it very strong and durable during prolonged exposure to saltwater and aggressive chemicals. It is often used in paper processing and power generation plants, as well as in the service industry.

•             Carbon steel:  Although carbon steel is ideal for high-temperature fluids, it does corrode easily under high levels of exposure to moisture, chemicals and acids.

•             Polypropylene (PP) lining: PP pipe lining is a good high-temperature pipe material as it performs very well in temperatures as hot as 225 degrees, as well as saltwater and both basic and acidic applications. However, it does not withstand solvents, volatile organic compounds (VOCs) or excessively low temperatures. PP lining is often used in water treatment facilities, chemical processing plants, power generation facilities and food and beverage manufacturing.