Patent ID: 9631471
Date: 2017-04-25
CPC Classifications: B01F,E21B

Claim:
1. A vapor hood for attachment to a blender tub for mixing proppant with a hydrocarbon fluid, the blender tub having an opening for receiving proppant, the vapor hood comprising: a vapor-containing chamber adapted to be secured around the opening of the blender tub; a first pressure-tight seal on an end of the vapor-containing chamber for sealing the vapor-containing chamber onto the blender tub; a proppant entrance port to the vapor-containing chamber for receiving proppant from a proppant supply source; the proppant entrance port including a one-way valve for preventing the escape of vapor through the proppant entrance port when proppant is not entering the vapor-containing chamber through the proppant entrance port; a second pressure-tight seal on the proppant entrance port for sealing with the proppant supply source; a sleeve opening on the vapor-containing chamber for accommodating a motor shaft, the sleeve opening further comprising a shaft seal; and a vapor extraction port for extracting vapor from the vapor-containing chamber, wherein the vapor-containing chamber, the first pressure-tight seal and the shaft seal are configured to maintain a pressure differential between an interior of the vapor-containing chamber and an exterior of the vapor-containing chamber.