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Experiments on steel steam boilers
Prevention of Steam Boiler Explosions.
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anti water, and ,]itfers but little from my hcemoslatie water. A single coat of this preserving liquid applied upon the substance which is then exposed to the open air, is sufficient to prevent its decay. Comptes tlendus.
.Experiments on Steel Steam Boilers. :From the Lc~nd.Practical Me~'hanic's Jourmd, April, 1864,
Some interesting experiments have recently been made in Prussia with steel steam boilers.--A steel steam boiler of the egg-ended shape~ 4 ft. in diameter and ~0 ft. in length, without flues, was tried. It had a steam drum 2 ft. in diameter and 2 ft. in height, and the plates were onefom'th of an inch in thickness. Beside it there was placed another boiler similar in every respect, excepting that the plates were of iron 0.414 of an inch in thickness. The steel boiler was teated by hydraulic pressure up to 195 pounds on the inch without showing leakage, and both the iron and steel boders were worked under u pressure of 6o poufids on the incll for about one year and a half. During this period, the steel boiler generated 25 per cent. more steam than the iron one, and when they were thoroughly examined after eighteen months practical working, there was less scale in the steel than in the iron boiler. The former evaporates 11"66 cubic feet of water per hour; the irou boiler 9"37 cubic feet. The quantity of coal consumed was on an average 2706 pounds for the steel o~te in twelve hours, and 2972 pounds for the iron boiler. The plates of the steel boiler over the fire were found to be uninjured, while those of the iron one were about worn out. In Prussia several worn-out plates of iron boilers have lately been replaced with steel, which, it is stated, lasts four times as long. As steel i~ twice as storng as iron, thiner plates of the former may be employed for boilers, and more perfect riveting can be secured. A greater quantity of steam can also be generated in the steel boiler on account of its thin plates, and thus much fuel may be economized. Such steam boilers should engage the attention of all who make and use steam boilers for engineering and manufacturing purposes.
Proceedings of the .3ssociation for the Prevention of 8leam Boiler Explosions, ~l~tnchesler. From the Journal of the ~)ciety of Arr~, No. ,558. [ ' R e p o r t o f t h e C h i e f E n g i n e e r ~br ) I a y , 1863.']
During the past month there have been examined 257 engines--1 specially ; 420 boilers--10 specially, 11 internally, 77 thoroughly, and 322 externally ; in addition to which, 1 of these boilers has been tested by hydraulic pressure. The following defects have been found in the boilers examined :--Fracture, 8 (3 dangerous); corrosion, 22 ; safetyvalves out of order, 1 ; water-gauges, ditto, 11 ; pressure gauges, ditto, 6 ; feed apparatus, ditto, 2 ; blow-out apparatus, ditto, 3 ; fusible plugs, ditto, 1; furnaces out of shape, 2 (1 dangerous); over-pressure, 2; (both dangerous); blistered plates 2. (1 dangerous); total, 60 (7 dane Vet,. X L V I I . - - T m a D
S ~ a i E s . - - ~ ' o . 4.--AeaiL, 1 8 6 4 .
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265
anti water, and ,]itfers but little from my hcemoslatie water. A single coat of this preserving liquid applied upon the substance which is then exposed to the open air, is sufficient to prevent its decay. Comptes tlendus.
.Experiments on Steel Steam Boilers. :From the Lc~nd.Practical Me~'hanic's Jourmd, April, 1864,
Some interesting experiments have recently been made in Prussia with steel steam boilers.--A steel steam boiler of the egg-ended shape~ 4 ft. in diameter and ~0 ft. in length, without flues, was tried. It had a steam drum 2 ft. in diameter and 2 ft. in height, and the plates were onefom'th of an inch in thickness. Beside it there was placed another boiler similar in every respect, excepting that the plates were of iron 0.414 of an inch in thickness. The steel boiler was teated by hydraulic pressure up to 195 pounds on the inch without showing leakage, and both the iron and steel boders were worked under u pressure of 6o poufids on the incll for about one year and a half. During this period, the steel boiler generated 25 per cent. more steam than the iron one, and when they were thoroughly examined after eighteen months practical working, there was less scale in the steel than in the iron boiler. The former evaporates 11"66 cubic feet of water per hour; the irou boiler 9"37 cubic feet. The quantity of coal consumed was on an average 2706 pounds for the steel o~te in twelve hours, and 2972 pounds for the iron boiler. The plates of the steel boiler over the fire were found to be uninjured, while those of the iron one were about worn out. In Prussia several worn-out plates of iron boilers have lately been replaced with steel, which, it is stated, lasts four times as long. As steel i~ twice as storng as iron, thiner plates of the former may be employed for boilers, and more perfect riveting can be secured. A greater quantity of steam can also be generated in the steel boiler on account of its thin plates, and thus much fuel may be economized. Such steam boilers should engage the attention of all who make and use steam boilers for engineering and manufacturing purposes.
Proceedings of the .3ssociation for the Prevention of 8leam Boiler Explosions, ~l~tnchesler. From the Journal of the ~)ciety of Arr~, No. ,558. [ ' R e p o r t o f t h e C h i e f E n g i n e e r ~br ) I a y , 1863.']
During the past month there have been examined 257 engines--1 specially ; 420 boilers--10 specially, 11 internally, 77 thoroughly, and 322 externally ; in addition to which, 1 of these boilers has been tested by hydraulic pressure. The following defects have been found in the boilers examined :--Fracture, 8 (3 dangerous); corrosion, 22 ; safetyvalves out of order, 1 ; water-gauges, ditto, 11 ; pressure gauges, ditto, 6 ; feed apparatus, ditto, 2 ; blow-out apparatus, ditto, 3 ; fusible plugs, ditto, 1; furnaces out of shape, 2 (1 dangerous); over-pressure, 2; (both dangerous); blistered plates 2. (1 dangerous); total, 60 (7 dane Vet,. X L V I I . - - T m a D
S ~ a i E s . - - ~ ' o . 4.--AeaiL, 1 8 6 4 .
23