Document g2M9EaZeykEVbk8LLYdKXYgRa

More PUNT PROBLEMS. commutator segments- This can came excessive sparking- Check by setting each col) in a neutral position and see if leads are shorted by the brush. H leads aren't shorted, shift brush position or ehooge coil load connection. Wrong inicTpole polarity also causes sparking. Test by shifting brush and noting direction of rotation. Correct position of brushes In an interpole mo tor is found by turning armature so one coil lies midway between main polea or direetiy under an interpole. Then trace leads from coil to commutator, if pos sible. Or l( motor has factory markings for correct position, use them (o set brushes correctly. Chances ere lead connections were incorrectly made at time of coll ohaoge. This is easy to do when you have a number of leads pulled out at the same time. Always use care when reconnect ing. A R Ecjcist Ml. Vernon, III. Af--r- Relief ro/v#i HERE ARC NINE CURES for Vfft trouble, together with their possible causes. Sparking causes commutator burns, so best method o( attack Is to find \h sparking oause and care it in a burry. Roll'end grind rough commutator surfaces to obtain the desired finish. If commutator b out of round, turn and grind it irue. Look for one or more commutator bars that loosen at high rotative speeds. Tighten loose bars, grinding and turning entire commutator if necessary. Undercut high mica. See that brush pressure is tafSeieat to prevent "bounce.* Adjust spring pressure ac cording to manufacturer's recommenda tions. Check (o see that brushes are not stuck In their holders, end that shunts are tight. If original brushes have been replaced, the new ones may be the wrong type. Remove any dirty film thet may have accumulated on commutator surface. It is always undesirable. A J BatucRt^tAits NeuYerk,N.Y. : `Yoanogt ''t Of . IpiOQt 30*60 60-100 too -ns 175-260 250*60 450-900 l/ieoat' A J 1 ! !A /1/2 2 3 8 / 4W ! IS* n/e U/9 n/2 2 C 4 5 6 6 to 12 0 15 ts 20 23 30 40 e p 2 2 P 202 3 0 r0 45 50 60 460 75 40 120 2200 What's Best Way to Remove Ammonia in Emergency! HERE ARK THE FACTS* We have 2000 lb of ammonia In our i frfgerailng system, which serves a large cold-storage plant. Because we have a Urge number of employes la the basements we need seme quick way of disposing of this ammonia In sn emergency. Wa have adequate water supply from on outside source as well as a 5O,O00-<plI basement storage tank. What method, if any, could w use to mix this ammonia with water In the storage tank, or mix ll end (hen discharge It to waste? We'd tike to be able to get rid of the ammonia In about 10 mlnotes.---T5, Jaffa Potter Here Are the Answers on Removing Ammonia- NEW YORK CITY rules for ammonia dis posal ere Interesting and may help TS. Here is a general outline; for specific wording, refer (o Administrative Code. Low-pressure side of ammonia sys tems having 1000 lb or move of refriger ant must have a hand-operated valve for discharging ammonia into water through a mixer to the newer In enter geney. Mixer should be steel to with stand a pressure of at (east SO pel. No valve is allowed in the ammonia emergency-discharge line except the manually operated valve discharging Into the water and ammonia mixer. But one stop valve may ha iaside the build ing for repair purposes. It should be sealed open and labeled, "Keep Open." A manually operated preiture-reliel valve should be located Sn o locked box, which eon bo opened by fire-deportment members. Door of box -Is on a public thoroughfare so It is easily accessible. Box It labeled for positive identification. A single, standard, 3-ln., fire-depa meat connection is provided, throo< which water may be supplied the tnU< Check valve between connection 41 mixer prevents flow of ammonia tu the street. Systems boring mare thi 27,000 lb of ammonia must have 0 additional mixar for each 27,000 lb fraction of it. Sketch above sho1 important details oJ required hooka John J Cmt Brooklyn, N. Y- (Continued on page 134) 193 PUNT OPERATION ANj> MAINTENANCE SECTION fOWH Mprgfhsrsvtf Is a Problem Use SUNTAC Suntac Oils stay put, leave no gummy residue. They are ideal for lubricating gears, sprockets, chains, cables, couplings, linkages and bearings where throw-off must be avoided. Call your nearest Sun office or write INDUSTRIAL PRODUCTS DEPARTMENT SUN OIL COMPANY PHILADELPHIA 3, PA. SUN OIL COMPANY LTD., TORONTO A MONTREAL SEPTEMBER 1943 133