Abstract: A wet scrubbing apparatus including a housing with a fluid flow inlet and a fluid flow outlet and a plurality of contactor beds disposed therein. Each contactor bed has an inlet and an outlet in communication with the fluid flow inlet and fluid flow outlet, respectively, of the housing and each of the contactor beds includes a damper assembly pivotally disposed within its inlet. As the gas flow rate through the apparatus changes, individual contactor beds can be removed from or brought onto stream by closing or opening selected damper assemblies.

Abstract: A sampling device for determining scale build-up on the walls of a vessel, one wall of the vessel having a sampling aperture therein to receive a sample member therethrough, the sample member remaining within the vessel during operation and including means to check scale build-up on the member without interfering with the operations going on inside the vessel.

Abstract: A stay bolt for utilization with two spaced structural members including an end link attached to one of the members and an eyelet with a threaded stem connected to the end link, the threaded stem extending through an aperture in the other member with means on the end thereof in communication with the other member to permit selected movement between the two spaced structural members in longitudinal and transverse directions.