ELECTROFUSION WELDING

CONTENTS:

1. DEFINITION & PRINCIPAL

2. WELDING MACHINE

3. INSTALLATION PROCEDURE

4. INSTALLATION VIDEOS

5. APPLICATIONS

6. HEALTH & SAFETY

ELECTROFUSION WELDING

DEFINITIONElectro fusion welding is the name given to resistive implant welding of thermoplastic pipes. It is one of two main techniques used for the joining of polyethylene gas and water pipes.

PRINCIPAL The electro fusion welding process involves the use of a molded socket fitting containing an electrical resistive heating coil. The prepared pipe ends are inserted into the sockets and clamped. An electric current is then passed through the coil for a pre-set time.  Heating of the surrounding polymer and heat transfer to the pipe wall takes place.

ELECTOFUSION WELDING MACHINEPARTS

1. Control Panel2. Universal Connectors /

Adaptors.3. Laser scanner4. Transport case5. GPS

ACCESSORIES

6. Scraper Tools7. Pipe Cutting Tools8. Cleaning Material9. Re-rounding Tools10. Pipe restraint equipments11. Markers12. Clamps / Rubber Mallet.

INSTALLATION PROCEDURE

The pipe ends must have a square, even cut (Remove reverted ends if necessary)

Remove any burrs or shavings from the pipe ends (chamfering leading edge to ease insertion).

Ensure clean hands with Pipe wipes or wear disposable gloves. Clean pipe ends on the outside and inside with Plasson Pipe wipes to remove any dirt or containments (inside first). Use a new Pipe wipe for each.

Measure and mark the pipe ends at proper stab depth. This is equal to half the fitting length + 20mm with fitting in bag. Use a marking pen to mark lines around the circumference on the entire area to be scraped. This helps to identify gaps in scraping when using a hand scraper.

INSTALLATION PROCEDURE

Scrape/peel pipe and spigot ends on fittings up to measurement mark to remove all oxidation and contaminants. Use a rotational scraper*.

Remove fitting from plastic bag. Slide fitting onto pipe until end meets with the stops in the ID of the fitting. Check measurement mark for proper stab depth. If pipe ovality exceeds 1% re-rounding clamps will be needed to round pipe. The pipe should be checked for ovality.

The pipe end(s) and the fitting must be correctly aligned and free of any bending stress. Use pipe clamps, or other suitable means, to secure the pipe(s) so they cannot move and ensure that the fitting is satisfactorily supported to prevent it sagging during the fusion procedure.

Block pipe ends to stop wind blowing through pipe and cooling the weld Zone.

TERMINOLOGY Many PE pipe manufacturers use the "Standard Dimension Ratio" - SDR - method of rating pressure piping. The SDR is the ratio of pipe diameter to wall thickness and the SDR can be expressed as SDR = D / s         (1)whereD = pipe outside diameter (mm)s = pipe wall thickness (mm)  

A SDR 11 means that the outside diameter - D - of the pipe is eleven times the thickness - s - of the wall.

With a high SDR ratio the pipe wall is thin compared to the pipe diameter With a low SDR ratio the pipe wall is thick compared to the pipe diameter

TERMINOLOGY

INSTALLATION VIDEOS

INSTALLATION VIDEOS

INSTALLATION VIDEOS

INSTALLATION VIDEOS

APPLICATIONS