Surge suppression device

Appartus to reduce pressure pulsations in a pipe line, the apparatus comprising:

• a central pipe adapted to be connected to the pipe line and having an inner surface;
• a resilient liner on the inner surface of the central pipe;
• a first tubular housing located substantially concentrically around the central pipe to define an intermediate chamber between the central pipe and the first tubular housing and open at each end;
• an opening in the central pipe closed by the liner whereby pressure variations in the central pipe may be communicated to the intermediate chamber;
• means attaching the first tubular housing on the central pipe;
• a second tubular housing, substantially concentric with the first tubular housing and defining an outer chamber, between the first and second tubular housings, extending beyond each open end of the intermediate chamber so that the outer chamber communicates with the intermediate chamber through the open ends of the first tubular housing, having end walls extending from the end of the second tubular housing;
• thereby defining a passageway between the first housing to the central pipe, forming the outer chamber, the end walls being spaced away from the walls of the first tubular housing, thereby defining a passageway between the first housing and the second housing and having an inlet means for introducing a gas into the outer chamber so that a selected pressure may be maintained within the intermediate and outer chamber.