Fittings for HDPE pipes are a necessary part of any water supply system. They divide the main pipe into two or three branches, create lateral branches, provide a turn of the route, and tightness when switching to a different diameter. Finally, they are needed to connect polyethylene pipelines with steel pipelines.
The heading presents low-pressure polyethylene (HDPE) fittings, which are used in the installation of pipelines of varying complexity and purpose. Their main advantage is their high strength, which allows them to withstand pressures up to 20 atm. With proper installation and operation, the service life can reach 50 years!
What are the advantages of HDPE fittings
- Retain geometry and original dimensions during operation
- They have a stable throughput, since deposits do not accumulate inside
- Easy to install and unpretentious in operation
- They tolerate temperature extremes
- Resistant to mechanical stress and aggressive environments
- Not subject to rusting and oxidation
- Basic selection parameters
Type of. All polyethylene fittings differ in shape and number of outlets. Straight lines with two holes are used for connecting and extending pipes, L-shaped – for making bends in the pipeline. Tees are required to create branches.
Diameter. It is matched to the cross-section of the pipes. If the fitting has all outlets of the same diameter, then it serves to connect pipes of the same cross-section. To change from one diameter to another, an element with different output dimensions is required.
This is the largest and most commonly used class of HDPE fittings Malaysia. They are connected to the pipes by welding, similar to the joints of two pipes. In terms of strength, such a connection is similar to a solid material.
The undoubted advantages of such fittings are low price, durability, a wide variety of types of products, their sizes and technical characteristics.
The disadvantages of welded fittings include the inability to disassemble the system, the pipes will have to be cut. For welding, a special apparatus is required, the price of which in the case of large pipes can amount to millions of rubles.
But for large construction and housing companies, the acquisition is justified, because they need to connect a huge number of polyethylene pipes directly or with fittings. Fittings are used for welded joints in durable communications at large facilities.
They are additionally divided into two subcategories – cast and welded.
The former are made by casting, and as an integral part, the fittings have high strength, suitable for pressure water pipelines with a pressure of 16 bar.
Welded fittings are made by welding two or more pipe lengths. They have a lower price and more choice of diameters.
Like the previous view, these fittings are designed to obtain a solid connection, but the heating element that melts the polyethylene is located in the product body itself. The current is supplied through electrofusion machines, they are much cheaper than conventional welding machines.
HDPE electrofusion fittings will become the preferred choice for small repair companies or internal plumbing services in enterprises and organizations when welding is not required constantly, but periodically. They can also be used to obtain continuous joints in hard-to-reach places where it is impossible to place a welding machine.
They provide a tight connection of polyethylene pipes by means of a clamping nut, collet, thrust and sealing rings. The main advantage of such fittings is that they are collapsible. If necessary, you can easily change the configuration of the pipeline, reuse fittings.
Another significant plus – the compression connection is mounted manually, if necessary, tightened with a key. Expensive welding machines are not needed.
The main drawback is the limited assortment – there are simply no compression fittings for large-diameter pipes. Also, over time, compression fittings can loosen, lose tightness.
They are used mainly for the installation of cold water pipes in private houses, for temporary connections, when repairing a damaged pipe, in other cases when the purchase and transportation of a welding machine is unprofitable.
In addition to the installation methods, there is a division of fittings according to their purpose. There are some for all categories, others only for one or two.