Dump valve arrangement

A dump valve arrangement for use with a discharge riser for receiving medium including solids, the dump valve arrangement comprising:

• (i) a settling chamber configured to couple to a lower portion of the discharge riser,
• (ii) a splitter inlet located at the lower portion of the discharge riser above the settling chamber, and operable to direct medium into the discharge riser;
• (iii) a dump valve located below the splitter inlet and operable to permit, in response to a trip event, or prevent the flow of medium from the discharge riser into the settling chamber;
• (iv) a compression input to the settling chamber including a pressurising bypass line including a compression valve to pressurise the settling chamber to reduce a pressure differential between the settling chamber and the lower portion of the discharge riser prior to opening the dump valve;
• (v) a decompression path including a decompression valve to reduce the pressure in the settling chamber after the dump valve has opened;
• and
• (vi) an outlet for emptying the contents of the settling chamber onto a dump area once the pressure in the settling chamber has reduced sufficiently.