. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. whenthe nipple is being screwed make up this joint timeand care are necessary. TheFig. 132. right threaded end on nipple slioud be first firmly screwed with the tongs or wrench into theright threaded end of fitting, then slacked out and screwed upagain by hand until tight, when it is screwed back by hand, atthe same time counting the number of threads it has enteredby hand. The same is done with the left threaded end ofnipple and fitting. If the right and left threads o
. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. whenthe nipple is being screwed make up this joint timeand care are necessary. TheFig. 132. right threaded end on nipple slioud be first firmly screwed with the tongs or wrench into theright threaded end of fitting, then slacked out and screwed upagain by hand until tight, when it is screwed back by hand, atthe same time counting the number of threads it has enteredby hand. The same is done with the left threaded end ofnipple and fitting. If the right and left threads of nipplehave counted the same number of threads, each thread, whenmaking the joint up, should enter the fittings at the sametime if possible, and particular care must be taken that thefittings are exactly opposite, to facilitate catching on, preventcrossing tlireads, and that no irregular strain comes on thenipple while being screwed up. In screwing up these nipples the coupling has to be turnedwith flats on the external surface to fit an internal wrench:in such cases the thread on nipple has one Maxims and Instructions. 25^ PIPES AND PIPING. These special couplings are marked with ribs on the out-side to distinguish them. Fig. 120 represents another jointin wroughtirou piping known as the union , composed ofthree pieces of the washer. Unions are also made with groundjoints, and the washer dispensed with. Radiator valves arenow generally connected by them, but if the hole in the radia-tor is not tapped accurately, the union when drawn up willnot be tight, or if tight, the valve will not be straight. Fig. 121 shows right and left threaded nipple connectingelbow and tee with wrought-iron pipes. The flange union, Fig. 122, is another joint generally usedon wrought-iron pipes above 4 or 5 inches in diameter in mak-ing connections to valves, etc., and on smaller pipes in posi-tions where is is a convenient joint. This joint consists of twocircular cast-iron flanges
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteamen, bookyear1917
