American Blacksmithing, toolsmiths' and steelworkers' manual . CHAPTER VIII HOW TO PATCH A BOILER. By H. Moen, Machinist, Cresco, Iowa. ^pHEN the leak or weak place in theboiler is found, take a ripping chiseland cut out all of the weak, thin andcracked parts. This done, make thepatch. The patch must be large,not less than an inch lap on all sides,but if double rows of rivets are wanted the lapshould be two inches on all sides. Bevel or scrape thepatch on all edges to allow calking. The bolt holesshould be about two inches apart and countersunk forpatch bolts, if patch bolts are used. Next, dr
American Blacksmithing, toolsmiths' and steelworkers' manual . CHAPTER VIII HOW TO PATCH A BOILER. By H. Moen, Machinist, Cresco, Iowa. ^pHEN the leak or weak place in theboiler is found, take a ripping chiseland cut out all of the weak, thin andcracked parts. This done, make thepatch. The patch must be large,not less than an inch lap on all sides,but if double rows of rivets are wanted the lapshould be two inches on all sides. Bevel or scrape thepatch on all edges to allow calking. The bolt holesshould be about two inches apart and countersunk forpatch bolts, if patch bolts are used. Next, drill twoholes in the boiler shell, one on each side of the patch,and put in the bolts. These bolts should be put in tostay and hold the patch in position while the rest ofthe holes are drilled and bolted. When the bolts areall in, take your wrench and tighten the bolts one afterthe other, harder and harder, striking at the sametime on the patch around its edges. At last strikelight on the bolt heads when you tighten and draw thebolt until its head breaks off. These bolts are made 137 i28 MODERN
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