Abstract: An improved apparatus for the speedy and efficient repair of tubes contained in a furnace boiler waterwall is disclosed. Disclosed are a milling machine used to mill the elongated slots, and drill and saw fixtures to aid in cutting away the damaged tube section. The improved apparatus enhances the precision and uniformity with which boiler tube repairs may be made, increases access to perform internal welds in boiler tubes and permits some prefabrication of necessary repair parts, thus reducing furnace down time for repair.

Abstract: Re-orientation of inlet ports to a by-pass valve which is used in industrial gas process systems to control the gas stream during system start-up, significantly reduces solid particle erosion of by-pass valve components and reduces costly system downtime for maintenance of by-pass valves.

Abstract: An improved method for the speedy and efficient repair of tubes contained in a furnace boiler waterwall involves milling an elongated slot at each end of a damaged tube section in a water wall, which section is thereafter cut away and replaced with a replacement tube section having elongated slots milled at each end which are cut to mate to existing tubes. The replacement tube section and existing tubes are aligned to form elongated slots through which interior welds are made to secure the replacement tube section. The elongated slots are then closed with covers cut from a second section of replacement tubing, and the water wall web is attached to the replacement tube section to complete the repair. Also disclosed are a milling machine used to mill the elongated slots, and drill and saw fixtures to aid in cutting away the damaged tube section.