Practical Coal Mining : a Manual for Managers, Under-Managers, Colliery Engineers, And Others

George L Kerr

The book Practical Coal Mining : a Manual for Managers, Under-Managers, Colliery Engineers, And Others was written by author George L Kerr Here you can read free online of Practical Coal Mining : a Manual for Managers, Under-Managers, Colliery Engineers, And Others book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Practical Coal Mining : a Manual for Managers, Under-Managers, Colliery Engineers, And Others a good or bad book?

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permin., Va=80 ft^* permin. .'. "T""go d^ .M50(^ -60xl5«.-. rf,=/y/?5^^=V90=»-48 in. So that pipes about 9| in. diameter would be suitable for a, 15 in. diameter plunger under the above oonditiona. A practical rule is to make the rising main about } the area of that of the plunger.
Thicknets of Pipes. — The thickness of pipe required will vary according to the pressure to be sustained and the constancy or otherwise of the pressure. If the pressure is uniform, the pipes may be made much lighter ...than where it varies, by the stopping and starting of the water column, as in a single-acting pump.
Similarly, if the water is corrosive the pipes will require to be extra strong.
Pipes are liable to rupture either transversely or longitudinally.
Their strength may be calculated according to the following formula : Rupture longitudinally : P x D = 2

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