Directed jet impulse pig launching system and method of its use

A method for retrofitting a pig launcher having a barrel and a kicker line attached to the barrel, the method comprising:

• providing a pig trap fluid injector assembly including:
• a longitudinally extending pipe sized to fit within the kicker line, the longitudinally extending pipe having a smaller diameter than that of the kicker line to form an annular space, the longitudinally extending pipe further including an inlet end with a flat profile flange, an outlet end with a curved-profile flange shaped complementary to a sidewall of the barrel, and at least one bend located in between said ends at an oblique angle α relative to horizontal;
• the flat-profile flange and the curved profile flange each including a leak path adapted to communicate with the annular space, the curved profile flange further including an opening;
• a nozzle connected to the longitudinally extending pipe and located at least partly in the opening
• wherein, when the kicker line is disconnected from the barrel, the pig trap injector assembly is contained by the kicker line and the kicker line is then reconnected to the barrel.