DN-07 Service laying

Checks size (i.e. outside diameter and SDR of pipe and fitting are compatible

Checks fusion heating time and the power requirements for larger fittings

Checks cooling time

Checks for a location that is flat and dry to carry out the operation

Checks the fitting is sealed within its protective bag, free from contamination and ensures it remains protected until immediately prior to its use

Is it acceptable to scrape any surface containing a heating element and what action must be taken if the fusion cycle stops mid process?

Checks the voltage of the fusion box is compatible with the fitting i.e. 39.5, 48 or 80 volts and the generator is the correct voltage / power output. Ensure that the generator has sufficient fuel to complete the electrofusion cycle

Checks the pipe ends are square and cuts if necessary

Checks the pipe for roundness and uses a re-rounding clamp where necessary

Prepares suitable restraining clamp for use, fitting adaptor shells if required

Checks there is sufficient clearance around the pipe to fit the restraining clamp

Cleans the jointing area of the pipe with a clean, damp non-synthetic cloth or paper toweling. If using soapy water, this must be cleaned off with clean water and the joint area dried

With the fitting still in its protective bag, places the fitting against the pipe and with a felt tip marker pen, marks half the length of the fitting plus 25mm and roughly marks a spiral line around the pipe. Repeats on the other pipe(s) to be joined

Uses an approved scraping tool to thoroughly scrape the whole area marked

Removes fitting from its protective bag taking care not to handle or contaminate the surface of the fitting containing the heating coil or section of scraped pipe

Places the fitting onto the end of the pipes, ensuring it touches the stop within the fitting. Marks the penetration depth on the side of the pipe at either end of the fitting

Assembles the restraining clamp onto the pipe, checks the penetration depth markings and visually checks pipe alignment in all planes. Rotates the fitting to ensure no excessive forces are present

Starts the generator and connects the control box to the generator

R&R - Suite of CAS inspection

Sets the control box timer to the fusion time marked on the fitting and starts process. Ensures all personnel are aware that electrofusion is in progress and they do nothing to disrupt the procedure

Stands clear of the fitting when fusion is in progress and does not adjust the restraining clamp during the fusion process

Checks the control box has completed its full cycle, disconnects the terminal leads from the fitting and allows the joint to cool for the required cooling time prior to removing the restraining clamp

Checks that the fusion indicators have risen and that no melted material or wire has extruded from the ends of the fitting

Checks the penetration markings to confirm that the pipe has not moved during fusion / cooling time

Checks joint result using print facility or electronic data retrieval from control box, if available

Pass/Refer