API was recently contacted by a client who had installed a bypass on a large diameter trunk main at a water treatment works. The client contractor had unfortunately managed to lose grip of the 380 mm drilled coupon, and lost this within the pipe section. The issue was that the 450 mm water main reduces down to 300 mm downstream, and the coupon could lead to a blockage and in turn create water restriction issues.
The water main could not be shut down as it feeds 40 000 homes, so the client was relieved when API offered the survey to be undertaken under standard operating water pressure.
The coupon was successfully located as required by the client. API working alongside PIPA Technology, is currently investigating a way to retrieve the coupon whilst the main is fully pressurised.