PORTABLE CONVEYING APPARATUS FOR TRANSFERRING PROPPANT FROM STORAGE CONTAINER TO BLENDER IN A HYDRAULIC FRACTURING OPERATION

1 . A portable conveying apparatus for use in a hydraulic fracturing operation to transfer proppant from one or more storage containers storing said proppant to a blender where the proppant is prepared for subsequent delivery to a hydraulic fracturing wellbore, in combination with the one or more storage containers and the blender, the portable conveying apparatus comprising:

a frame;

a plurality of wheels mounted on the frame for rotation about respective wheel axes so as to support the frame in movement across a ground surface;

a hitch coupling attached to the frame so that the frame is towable across the ground surface by a transport vehicle;

a conveyor supported on the frame and having a conveying member driven to transfer the proppant from an intake of the conveyor to a discharge of the conveyor, the intake being operatively communicated with the one or more storage containers to receive the proppant therefrom and the discharge of the conveyor being communicated with the blender so as to transfer the proppant to the blender;

a control system which is operatively coupled to the conveyor for controlling the conveying member to transfer the proppant from the intake to the discharge;

an operator cab mounted on the frame so as to be portable therewith for housing an operator using the control system to operate the conveying member;

the operator cab being arranged so that an interior of the blender where the proppant is prepared is visible to the operator when located therein;

the operator cab including:

a floor;

a peripheral wall standing upwardly from the floor,

a ceiling closing a top of the peripheral wall;

a door arranged so to define a selectively openable entryway into the operator cab to enable the operator to pass from outside the operator cab into the operator cab;

a window mounted in the peripheral wall in a manner so that the interior of the blender is visible from inside the operator cab;

whereby the floor, the peripheral wall, the ceiling and the door of the operator cab collectively form a substantially enclosed space which restricts passage of air outside the operator cab into the operator cab;

the operator cab including an air filtration system adapted to permit passage of air which is free of silica dust between the outside and the inside of the operator cab;

the operator cab further including a controller of the control system located in the substantially enclosed space for interfacing with the control system to operate the conveying member.

2 . The portable conveying apparatus of claim 1 wherein the air filtration system is adapted to pressurize the operator cab to form an air pressure gradient between the inside and the outside of the operator cab with greater air pressure inside the operator cab than outside of the operator cab so as to be suited for expelling particulate material out of the operator cab.

3 . The portable conveying apparatus of claim 1 wherein the frame has longitudinally opposite ends and laterally opposite sides, and wherein the window is located at a laterally offset location from a lateral position of the discharge of the conveyor relative to the frame.

4 . The portable conveying apparatus of claim 1 wherein the frame has longitudinally opposite ends and laterally opposite sides, and wherein the cab is located at a laterally offset location from a lateral position of the discharge of the conveyor relative to the frame.

5 . The portable conveying apparatus of claim 1 wherein the frame has longitudinally opposite ends and laterally opposite sides, and wherein the discharge of the conveyor is located generally laterally centrally of the frame and the operator cab, which is smaller in width than a width of the frame between the laterally opposite sides thereof, is located closer to one of the lateral sides of the frame than the other.

6 . The portable conveying apparatus of claim 1 wherein the frame has longitudinally opposite front and rear ends, the hitch coupling is located at the front end and the discharge of the conveyor is located at the rear end, and the operator cab is located on the frame at a longitudinally spaced position from the rear end of the frame.

7 . The portable conveying apparatus of claim 6 wherein the floor of the operator cab is spaced above the frame and arranged at a suitable height for the operator standing thereon to see over the frame and beyond the rear end of the frame.

8 . The portable conveying apparatus of claim 1 wherein the operator cab is formed by a retrofit kit of parts connected to the frame of the portable conveying apparatus after manufacture of the portable conveying apparatus at a manufacturing facility.

9 . The portable conveying apparatus of claim 1 wherein the operator cab further includes an externally mounted spotlight which is oriented so as to illuminate the interior of the blender.

10 . The portable conveying apparatus of claim 9 wherein the spotlight is mounted at a laterally offset location from a lateral position of the discharge of the conveyor relative to the frame.