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The exhaust from the high-pressure cylinders passed through a receiver pipe along the centre of the engine to the low-pressure cylinders. The exhaust from the low-pressure cylinders passed to the smokebox and blast pipe through a pipe fitted with flexible connections. [2] The firebox had a short combustion chamber.
For example, DN20 is the size for copper pipe with an outside diameter of 19.05 mm or 3 ⁄ 4 inch. While pipe sizes in Australia are inch-based, they are classified by outside rather than inside diameter (e.g., a nominal 3 ⁄ 4 inch copper pipe in Australia has measured diameters of 0.750 inches outside and 0.638 inches inside, whereas a ...
Metal liners may be stainless steel, aluminum, or galvanized iron and may be flexible or rigid pipes. Stainless steel is made in several types and thicknesses. Type 304 is used with firewood, wood pellet fuel, and non-condensing oil appliances, types 316 and 321 with coal, and type AL 29-4C is used with high efficiency condensing gas appliances.
The end of the final length of the exhaust pipe where it vents to open air, generally the only visible part of the exhaust system part on a vehicle, often ends with a straight or angled cut but may include a decorative tip. The tip is sometimes chromed. It frequently has a larger pipe than the rest of the exhaust system.
When the descending piston first exposes the exhaust port on the cylinder wall, the exhaust flows out powerfully due to its pressure (without assistance from the expansion chamber) so the diameter/area over the length of the first portion of the pipe is constant or near constant with a divergence of 0 to 2 degrees which preserves wave energy.
The front end of the pipe was fitted with an expansion joint near the connection which led to the steam chests of the low-pressure cylinders. The exhaust from the low-pressure cylinders was carried by a pipe, also 7 + 1 ⁄ 2 inches (191 millimetres) in internal diameter, with flexible connections leading into the smokebox. [2]