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The gauge glass on a boiler needs to be inspected periodically and replaced if it is seen to have worn thin in the vicinity of the gland nuts, but a failure in service can still occur. Drivers are expected to carry two or three glass tubes, pre-cut to the required length, together with hemp or rubber seals, to replace the tubes on the road. [1]
Gauge glass part of the water level gauge, which normally consists of a vertical glass tube connected top and bottom to the boiler backplate. The water level must be visible within the glass at all times. [3] Grooving erosion of a boiler's plates from the internal water space, particularly where there is a step inside the shell.
It is also frequently applied on magnetic sight gages. In this variation, the magnet is installed in a float that travels inside a gage glass or tube. The magnet operates on the sensor which is mounted externally on the gage. Boilers and other high temperature or pressure applications take advantage of this performance quality
The gauge glass cocks and tubes and fusible plug should be cleared of scale; if the core of the fusible plug shows signs of calcination the item should be replaced. [13] On reassembly care should be taken that the threaded plugs are replaced in their original holes: the tapers can vary as a result of rethreading.
Fire-tube boilers usually have a comparatively low rate of steam production, but high steam storage capacity. Fire-tube boilers mostly burn solid fuels, but are readily adaptable to those of the liquid or gas variety. Fire-tube boilers may also be referred to as "scotch-marine" or "marine" type boilers. [7] Diagram of a water-tube boiler.
Spanner boilers were also known for their use as train-heating boilers. spherical boiler: [55] Stanley steam-car boiler: an extremely compact vertical multitubular fire-tube boiler, used in the Stanley steam car. Steam generator: modern boilers, with very small volume in relation to their heating area. Boiling is thus almost instantaneous and ...
Often the gauge has little to do with the scale of a locomotive since larger equipment can be built in a narrow gauge railway configuration. For instance, scales of 1.5, 1.6, 2.5, and 3 inches per foot (corresponding to scales of 1:8 to 1:4) have been used on a 7 + 1 ⁄ 2 in ( 190.5 mm ) track gauge.
Requirements for any steam boiler, vital if the engine was to be operated safely. Safety valve is "pop" type rather than "dead weight" Firstly the pop valves were a type used in industry; secondly the dead-weight type could be held down (so it would never work properly); and thirdly a dead-weight valve tends to bounce and thus waste steam.
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