Patent ID: 8708779

Claim:
A two stage silencer system for reducing noise during blowdown operation of a blast pot vessel used in abrasive blasting operations, the system comprising: a. A first expansion chamber in communication with a blowdown outlet port of the vessel; b. A second expansion chamber in communication with and downstream of the first expansion chamber, the second expansion chamber further including: i. A sound absorbing material; ii. An outlet redirecting airflow in a direction different from the direction of airflow in passing through the blowdown outlet port of the vessel; c. A shut-off valve positioned downstream of the first expansion chamber and upstream of the second expansion chamber; and d. A restrictor upstream of the first expansion chamber for controlling the flow of air from the blowdown outlet port of the vessel, wherein both the restrictor and the first expansion chamber are of a generally cylindrical cross-section and wherein the inner diameter of the first expansion chamber is approximately two and one half times the inner diameter of the restrictor.