Method of lining the internal surface of a pipe

A method of lining an internal surface of a pipe, the method comprising the steps of:

• inserting a lining pig into the pipe from an open end thereof:
• introducing an amount of a resin, which is necessary to line the internal surface of the.sub.-- pipe, into the pipe from the open end subsequent to the insertion of the lining pig;
• providing first and second spherical bodies each of a soft resilient material, as first and second liquid blocking pigs;
• interposing a flexible liquid barrier diaphragm inside each of the first and second liquid blocking pigs at a position offset from a center position of the spherical body and corresponding to an inner diameter of the pipe;
• forming each liquid barrier diaphragm into a circular shape having a diameter equal to the inner diameter of the pipe;
• inserting into the pipe behind the resin a) the first liquid blocking pig, b) a liquid absorbing material for absorbing liquid remaining on the pipe internal surface and c) the second liquid blocking pig for blocking a liquid in order to prevent the resin from mixing with the liquid;
• injecting an amount of pressurized liquid into the pipe subsequent to the insertion of the second liquid blocking pig;
• forcing the lining pig, the resin, the first liquid blocking pig, the liquid absorbing material and the second liquid blocking pig to move forwardly through the pipe by the pressurized liquid until a front end of the resin reaches an inner end of the pipe;
• and
• sucking back the injected pressurized liquid such that the first liquid blocking pig, the liquid absorbing material, the second liquid blocking pig, the resin and the lining pig are moved backwardly through the pipe so as to line the internal surface of the pipe with a layer of the resin wherein an even resin lining layer is evenly applied to the internal surface of the pipe by means of the lining pig.