. A manual of marine engineering: comprising the design, construction, and working of marine machinery. r rivets which fixthe brass plate are to be officially stamped, andan impression of this mark is to be inserted onthe certificate of test. 12. When boilers have undergone a thoroughrepair in the boiler shop, or when they have hadto be stripped and extensively repaired on board,they must be tested by hydraulic pressure the same as new boilers. When in boilers with internal furnace, the furnace has been taken outto repair or renew, and wlien in locomotives the fire-box has been takenout to rep
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. r rivets which fixthe brass plate are to be officially stamped, andan impression of this mark is to be inserted onthe certificate of test. 12. When boilers have undergone a thoroughrepair in the boiler shop, or when they have hadto be stripped and extensively repaired on board,they must be tested by hydraulic pressure the same as new boilers. When in boilers with internal furnace, the furnace has been taken outto repair or renew, and wlien in locomotives the fire-box has been takenout to repair or renew, or when in cylindrical boilers one or more plateshave been renewed, the boilers must, on completion of such repairs, betested by hydraulic pressure as above. When a boiler has undergone considerable repairs the steam pressure tobe allowed must be determined afresh. 13. Test Gauge.—Tlie test pressure is to be registered by an openmercurial gauge, or by the standard pressure gauge provided by theinspecting official. Each boiler to be tested must be fitted with a connection to suit the. GERMAN GOVERNMENT RULES FOR BOILERS, 671 standard gauge, and by which tlie gauge may be aj)i)]ied by the inspectingofficer. To facilitate application of official test gauge, a flanged brancli is to beprovided immediately below the usual pressure gauge. The opening in theflange and cock must not be less than 7 millimetres, the length of thebranch must be 60 millimetres, and its breadth 25 millimetres. Form tobe as shown in sketch. RULES FOR STRENGTH OF BOILERS. 5th August, quantities are expressed in centimetres and kilogrammes :— (1 kilo, per sq. cm. = 1 atm. = 14-223 lbs. per aq. in English). Formulae for thickness of shell plate and working pressure :— S X R X 2T Working pressure =Thickness of plate = D X F P X D X F S X K X 2 Where P = highest steam pressure (kilos, per sq. cm.).S = lowest tensile strength of = thickness of shell = greatest interna
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