Written in English
|Contributions||Manchester Metropolitan University. Department of Polymer, Metals and Dental Technology.|
Electrofusion welding and butt fusion welding are common methods for joining polyethylene pipes used for water and gas distribution. Because of the wide use of these two methods in infrastructure engineering, welded pipe joints and pipe materials should Author: Soran Saleem Alkaki, Mete Onur Kaman. There are 3 main types of fusion joint geometry, which include; 1. Butt weld 2. Socket joint a. Electrofusion b. Hot iron socket 3. Saddle joint a. Electrofusion b. Hot iron socket The butt fusion technique is a simple one whereby the two ends of the pipes to be joined are trimmed flat and square to each other and then heated using a flat heater. Jointing techniques are butt fusion, electrofusion, socket fusion, and mechanical joints. They have enabled system properties of joints to be the same as for pipes. BG evaluated High Density Polyethylene (HDPE) and Medium Density Polyethylene (MDPE), opting for MDPE, but in Australia the older "first generation" HDPE was initially used. • Understand the principles of polyethylene (PE) pipe butt fusion jointing. • Identify pipe and appropriate fitting markings. • Site the equipment. • Carry out pre-jointing machine and equipment checks. • Make satisfactory butt fusion joints across a range of pipe sizes. • .
• Identify pipe and compatible fittings. • Inspect for, and identify acceptable quality joints. • Make satisfactory electrofusion joints from compatible pipes and fittings. • Site the equipment. Safety Notice To ensure operator safety and comply with Health and Safety regulations all electrofusion control boxes must be operated from an. The two most common methods to weld it are the electrofusion and the butt welding. Due to the characteristics, the polyethylene is ideal for the drinking water distribution networks, although it can have other uses in industrial applications, to protect cables and as part of the heating systems. Polyethylene Pipe and Tubing) and ASTM D (Standard Specification for Butt Heat Fusion Polyethylene Plastic Fittings for Polyethylene Plastic Pipe and Tubing) are important designations to insure that the fittings will fuse properly to the pipe. To summarize, • HDPE must be O.D. controlled. • HDPE must be SDR11 or better (SDR permanent, monolithic fusion joint. PolyPipe® fusion procedures require specific tools and equipment for the fusion type and for the sizes of pipe and fittings to be joined. Butt Fusion – This technique consists of heating the squared ends of two pipes, a pipe and fitting, or two fittings by holding them against a heated.
Experience has shown that a joint made by a properly trained person, using proven fusion procedures and that passes a visual inspection based on proper bead formation, will have strength characteristics comparable to the pipe itself. Fused pipe sections become, in effect, a single piece of pipe. Our Pipe Fusion Service Includes. Butt fusion involves the simultaneous heating of the ends of two pipe/fitting components which are to be joined, until a molten state is attained on each contact surface. The two surfaces are then brought together under controlled pressure for a specific cooling time and a homogeneous fusion joint is formed. No leakage: The polyethylene pipe system is connected by electrofusion and butt fusion methods, and the strength of the joint is higher than the strength of the pipes. High toughness: The elongation at break of HDPE pipes is generally above %. For the uneven settlement of the foundation engineering construction, its adaptability is very. All heat fusion joining methods require that there is no water flowing or standing in or below the pipe that can reach the fusion surfaces. De-watering of the site may be required to prevent ground water from reaching the fusion and contaminating the surfaces to be joined. Dewatering can be accomplished using portable submersible pumps (Fig.1) in.