Shipbuilding and Shipping Record . ored and cover studs fitted in shop. Cylinder coverswere then fitted, openings blanked off and test applied. It wasfound that when a cylinder under test was completely filled withwater most of the leaks developed without further pressure. Inevery case, however, before the hydrostatic pressure was appliedthe water in the cylinder was heated by steam to at least 150 deg. usual liydrostatic test pressure of about 50 jier cent. ofworking pressure was then applied as follows :-- High 3uU III. piTMi. ii\. First intermediate loO ,, „ Secnnilinterniedia
Shipbuilding and Shipping Record . ored and cover studs fitted in shop. Cylinder coverswere then fitted, openings blanked off and test applied. It wasfound that when a cylinder under test was completely filled withwater most of the leaks developed without further pressure. Inevery case, however, before the hydrostatic pressure was appliedthe water in the cylinder was heated by steam to at least 150 deg. usual liydrostatic test pressure of about 50 jier cent. ofworking pressure was then applied as follows :-- High 3uU III. piTMi. ii\. First intermediate loO ,, „ Secnnilinterniediate ... 7.^ „ „ 66 SHIPBUILDING AND SHIPPING RECORD. January 17, 1918. After the hydrostatic test all cylinders were tested under steam,in the case of second intermediate and low-pressure cylinders totheir working pressures, and in the case of high-pressure and firstintermediates to 100 lb. In none of the acetylene welds did any leaks, other than one ortwo pin-holes, show. In the arc welds leaks of \:i ritms sizes dt^velopcil. Studding Device as used with Arc Welding. in practically all wclfis, and were closed by reweUling or large weld in the Btdgarm. for example, was tested four timesbefore passed as tight. In every case the leak was between thewelded metal and the cast-iron cylinder wall. No leaks showedwhere the welded metal joined the cast-steel patch. In preparing the cylinders for either arc oracetylene welding the jagged edge of the breaJiwas first smoothed off and then bevelled toapproximately 45 deg. ; wooden patterns repre-senting the patch were then fitted to the breakin the cylinder and a cast-iron or steel patchmade from this j)attern. The cast-iron orcast-steel patch, after cleaning, was fitted tothe cylinder and bevelled to approximately ;deg. on the welding edge. The patch was thenclamped in place for welding. When arc welding was to be used all cast-iron edges adjacent to the weld were drilledand tapped for i-in. studs spaced about
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