Patent ID: 6739950
Filing Date: 2004-05-25
Classification: B05D,B08B,E03B,F16L

Abstract:
A pipe renovating method, comprising the steps of:pumping a mixture of pressurized gas and particles of abrasive material into a first end of a pipe; simultaneously applying suction to a second end of the pipe; whereby the mixture is pumped in at the first end and sucked out at the second end of the pipe so as to be conveyed alone the pipe with the abrasive particles cleaning the inner surface of the pipe; determining when the inner surface of the pipe has been sufficiently cleaned by the abrasive materials; and coating the inner surface of the cleaned pipe with coating material; the step of coating the inner surface of the pipe comprises pumping a mixture of gas and liquid coating material into one end of the pipe while applying suction to the other end of the pipe.