. The Street railway journal . at125 hp. Shell plates and heads are open-hearth steel. Thetubes are steel, the space between rows being a minimum of1 in. All tubes are at least 3 ins. from the boiler shell, rivetsI- in. diameter, and heads are stayed above tubes by throughbraces running length of boiler from head to head. Eachboiler has two cast-iron nozzles 6 ins. internal diameter, forsteam and safety valves riveted to the shell. There are alsodry pipes in each boiler to prevent priming, perforated onthe upper side with J-in. holes aggregating the steam nozzlein area and drained by two -]-in
. The Street railway journal . at125 hp. Shell plates and heads are open-hearth steel. Thetubes are steel, the space between rows being a minimum of1 in. All tubes are at least 3 ins. from the boiler shell, rivetsI- in. diameter, and heads are stayed above tubes by throughbraces running length of boiler from head to head. Eachboiler has two cast-iron nozzles 6 ins. internal diameter, forsteam and safety valves riveted to the shell. There are alsodry pipes in each boiler to prevent priming, perforated onthe upper side with J-in. holes aggregating the steam nozzlein area and drained by two -]-in. holes in the under plugs are provided with centers 2 ins. above theupper row of tubes. The blow-off pipes are 2\ ins. indiameter. Each boiler also has one 12-in. brass steam gage,one combination water column and one internal brass feed-pipe 2 ins. in diameter. Two manholes, 11 ins. x 15 10 ins. x 15 ins., are placed, one in the rear sheet on topof each boiler, the other in the front tube sheet under the. white lead and linseed oil. An Akron inlet pipe was laidfrom the end of the power station wharf to the well, withbulkhead, strainer and gate at its end, with cement plumbing was done according to the city of Bostonsregulations. There are four steel roof trusses in the engineroom and four in the boiler room designed with a factor ofsafety of 4 against a total wind and snow load of 40 lbs. persquare foot area exclusive of the roof itself. The boilerhouse trusses are designed for an additional load of 10,000lbs. applied at any point of the bottom chord. Trusses reston cast-iron plates built into the wall, and are held in placeby anchor bolts, which are also built into the wall and comeup through the plates, slots being left in the shoes at theend of each truss for adjustment and expansion. Trussesare braced laterally in the plane of bottom cords, and havea minimum bearing of 8 ins. The engine room span is 52ft., the boiler room span being 40 ft. S
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
