Device for testing vertical tubes in a chemical reactor

1. A method for calibrating a device for measuring back pressure in open-ended chemical reactor tubes, comprising the steps of:

providing a device for measuring back pressure in open-ended chemical reactor tubes, including a frame member and a plurality of injector tubes mounted on the frame member with a spacing between the injector tubes;

providing a test stand, comprising a frame member; a base supporting said frame member; and a plurality of calibration tubes mounted on the frame member, each of said calibration tubes having an open top and a closed bottom, with a precision orifice in the closed bottom to simulate the chemical reactor tubes to be tested;

inserting the plurality of injector tubes into the respective calibration tubes;

sealing between the injector tubes and the calibration tubes;

sending gas through the injector tubes and taking a back pressure reading for each of the injector tubes; and

generating correction factors for each injector tube to correct for variations in the back pressure readings.

2. The method for calibrating a device for measuring back pressure in open-ended chemical reactor tubes as recited in claim 1 , and further comprising the step of adjusting the positions of the calibration tubes on the frame member to match the spacing between the injector tubes before inserting the injector tubes into the respective calibration tubes.