. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . such that engines may behandled successfully with very little use of the blow-offcock, but our investigations indicated on a railroad wherewaters over a division are treated, successful handling ofthe situation depends entirely on the proper use of theblow-off cock. Examples of letters of instructions toenginemen relative to blowing off are given herewith fordifferent railroads. Treated Water—To Enginemen Waters containing sulphate of lime cause hard scale tobe formed in boilers, and, to prev
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . such that engines may behandled successfully with very little use of the blow-offcock, but our investigations indicated on a railroad wherewaters over a division are treated, successful handling ofthe situation depends entirely on the proper use of theblow-off cock. Examples of letters of instructions toenginemen relative to blowing off are given herewith fordifferent railroads. Treated Water—To Enginemen Waters containing sulphate of lime cause hard scale tobe formed in boilers, and, to prevent this scale, suchwaters are treated with the necessary amount of soda ash. The bad effect of soda ash is, as you all know, the in-crease in foaming tendency of the water. The soda ashor the sulphate of soda (the result of its action on thelime) remains dissolved in the water in the boiler, in-creasing in amount as more water is evaporated, andwhen enough has accumulated in the boiler, water isthrown over with the steam and foaming occurs. The only way you can avoid this condition is to remove. Fig. 6. Blow-Orf Cock on Back Head of Narrow Flre-Box Engines part of the soda ash by blowing the water out and re-placing it with fresh water from the tank, and you mustblow out a sufficient quantity of water to bring about thisresult. Some waters are more foamy than others, and a largeamount of water must be blown off after taking thesewaters. Do not blow off while or after having had injector onand not working steam, for the cold fresh water falls tobottom and will be taken out instead of the bad water. Do not neglect your blowing because you have a lighttrain or because engine has just been washed. You mayleave boiler in bad shape for the next man, who mayhave a heavy train. Blow out at water tanks if you can do so without dam- September, 1927 RAILWAY AND LOCOMOTIVE ENGINEERING 271 aging adjoining property; you can then leave with fulltank of water and will not have to waste wate
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