The spears ran as a single main dry spear of 14 inches (360 mm) square Memel pine to just above the high main. A 'Y' then connected the main spear both to the wet spear of the second stage pump and to the 10 inches (250 mm) square dry spear of the bottom pump. Coulson reported that the main spear had broken 12–14 feet below the bank; the bottom dry spear was broken at a 'spear plate' (junction piece) opposite the high main. From his examination, they had failed under tension (and therefore, he deduced, before the beam broke).
For starters, I have never heard of any arrangement where water is "sucked" up a rising main as it would only take a short distance for the weight of the water to equal the partial vacuum drawing the water.
That sounds interesting I would certainly enjoy a read of them , now I quit smoking every night all I do is read as Chris knows because I question him when I don’t understand something
Started my new read last night mine ventilation - D & JS Penman cannot understand all the math equations but is still a most interesting read !
... Llanrwst... with its rather unique system.
Quote from: Down and beyond on June 04, 2021, 06:55:40 amStarted my new read last night mine ventilation - D & JS Penman cannot understand all the math equations but is still a most interesting read !I don't know the book, but if you are going to look at ventilation you will find the maths very much easier in metric units. Imperial ventilation units were hard work.Think of ventilation as like electricity. You have voltage which is pressure pushing the air round, current which is volume moving and resistance which is the resistance of the roadways.
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