OCR Text |
Show A tight fitting metal plug is used to seal the sight ports when not in use. A number of these plug s have since been drilled and tapped, fitted with couplings and plastic tubing, and connected to manometry equipment so that the pressure along the length of the chamber can be measured. In addition to these ports, auxiliary openings are available for vertical traverses from the top of the water tank. The burner under test is mounted on the combustion chamber centerline in the firebrick-lined thrust wall. The wall is designed to resist the maximum expected differential expansion between the combustion chamber and the tank, with movement of the combustion chamber being permitted towards the stack end Access to the combustion chamber, when a burner is fitted, is at the stack end through a water-cooled door, which is hinged to the tank. The door is fitted with a central observation port, giving a full view of the combustion chamber. As the rig is required to test a number of different burners, a 4' (1.22m) diameter hole is provided in the end plate at the burner end, so that throats up to 40" (1.02m) diameter can be accommodated. All burner/windbox equipment is fitted to the flange surrounding this fixing hole. Both tank and combustion chamber are fitted with drain cocks, the tank and the chamber being at the end of a straight pipe to facilitate the clearance of emulsified oil or debris. 12-54 |