Polymer fittings are commonly used in a wide range of industrial, commercial, and residential applications. They are preferred over traditional metallic fittings because of their flexibility, durability, and cost effectiveness. However, the question of whether polymer fittings can be used for drinking water applications is an important one. In this article, we will explore the different types of polymer fittings available, their properties, and their suitability for use in drinking water applications.
Polymer fittings are used to connect pipes and tubing in various applications, including industrial, commercial, and residential. They are made from a range of polymer materials, including polyethylene, polypropylene, PVC, and PEX. These materials have unique properties that make them suitable for different applications.
Drinking water applications require that the materials used in fittings are safe for human consumption and do not contaminate the water. This is because the health of individuals depends on the quality of the water they consume. Therefore, it is essential to use fittings made from materials that meet the required standards.
There are different types of polymer fittings, and each has unique properties that make it suitable for specific applications. Some of the common types of polymer fittings include :
2.1 Polyethylene Fittings
Polyethylene fittings are made from high density polyethylene (HDPE) or low density polyethylene (LDPE). HDPE fittings are preferred for drinking water applications because they are resistant to chemicals and do not corrode. They are also resistant to UV rays, which makes them suitable for outdoor applications. LDPE fittings are used in low pressure applications such as irrigation and landscaping.
2.2 Polypropylene Fittings
Polypropylene fittings are made from polypropylene, which is a thermoplastic polymer. They are resistant to chemicals and high temperatures, making them suitable for use in industrial applications. They are also used in residential plumbing for hot and cold water supply.
2.3 PVC Fittings
PVC fittings are made from polyvinyl chloride (PVC) and are commonly used in residential plumbing for hot and cold water supply. They are also used in industrial applications, including chemical processing and water treatment. PVC fittings are resistant to chemicals, corrosion, and UV rays.
2.4 PEX Fittings
PEX fittings are made from cross linked polyethylene (PEX) and are commonly used in residential plumbing. They are flexible and easy to install, making them popular among plumbers. They are also resistant to chemicals and corrosion.
The properties of polymer fittings vary depending on the type of polymer used. However, some of the common properties of polymer fittings include :
3.1 Chemical Resistance
Polymer fittings are resistant to chemicals, making them suitable for use in a range of applications. They do not corrode or react with chemicals, which ensures that the quality of the water is maintained.
3.2 Durability
Polymer fittings are durable and can withstand harsh conditions such as extreme temperatures and UV rays. They do not crack or break easily, which ensures that they last longer and do not require frequent replacement.
3.3 Cost Effectiveness
Polymer fittings are cost effective compared to metallic fittings. They are cheaper to manufacture and do not require expensive installation equipment. This makes them an ideal choice for budget conscious consumers.
Polymer fittings are suitable for drinking water applications provided that they meet the required standards. In the United States, the Safe Drinking Water Act (SDWA) sets the standards for drinking water quality. The act requires that all materials used in drinking water applications meet the NSF/ANSI 61 standard.
NSF/ANSI 61 is a standard that sets the requirements for materials used in drinking water applications. It
defines the maximum levels of contaminants that can leach from the material into the water. The standard covers various materials, including fittings, pipes, and treatment chemicals.
To meet the NSF/ANSI 61 standard, polymer fittings must undergo rigorous testing to ensure that they are safe for human consumption. The testing includes evaluating the chemical composition of the materials, assessing their durability, and measuring their resistance to chemical leaching.
Polyethylene and polypropylene fittings are commonly used in drinking water applications and are NSF/ANSI 61 certified. PVC fittings can also be used for drinking water applications provided that they meet the standard. However, PEX fittings require additional testing to ensure that they meet the required standards.
It is important to note that not all polymer fittings are suitable for drinking water applications. Some low quality fittings may contain contaminants that can leach into the water, affecting its quality. It is essential to purchase fittings from reputable manufacturers who can provide certification that their products meet the required standards.
There are several advantages of using polymer fittings in drinking water applications, including :
5.1 Chemical Resistance
Polymer fittings are resistant to chemicals and do not corrode, ensuring that the water quality is maintained.
5.2 Durability
Polymer fittings are durable and can withstand harsh conditions, reducing the need for frequent replacements.
5.3 Flexibility
Polymer fittings are flexible and easy to install, reducing installation time and costs.
5.4 Cost Effectiveness
Polymer fittings are cost effective compared to metallic fittings, making them an ideal choice for budget conscious consumers.
Polymer fittings are suitable for drinking water applications provided that they meet the required standards. The NSF/ANSI 61 standard sets the requirements for materials used in drinking water applications and ensures that they do not contaminate the water. Polyethylene and polypropylene fittings are commonly used in drinking water applications and are NSF/ANSI 61 certified. PVC fittings can also be used for drinking water applications provided that they meet the standard. However, PEX fittings require additional testing to ensure that they meet the required standards.
Polymer fittings offer several advantages over metallic fittings, including chemical resistance, durability, flexibility, and cost effectiveness. They are a popular choice for various applications, including industrial, commercial, and residential plumbing. It is important to purchase fittings from reputable manufacturers who can provide certification that their products meet the required standards to ensure that the quality of the water is maintained.
