Document v6Y12YJxd09pbgqaYD8ay4Mzq

More PLANT PROBLEMS. when line pressure becomes excessive (2) metallic bellows that expend when pressure rises (3) flexible containers filled with gas that Is compressed by a pressure rise. All these devices are effeclive when applied right. \V One common and cheap way of aolving water-hammer problems in the plant is with air chambers, shown in sketches above. With flow rote of 7 fps and static pressure of 25 pai, shock pressuro is about 425 pat. Shock-wave velocity is about 4400 fps for line sizes in Cffs installation. Wall thickness of his piping Is sufficient to withstand the shock. Air chambers having the dimensions shown and located aa detailed in piping sketch do a good job. Rechirgo the chambers periodically beoauie the trapped air dissolves in the water. A J Dreucklmans New York SUPPRESSOR, installed in wall behind flush valves, as In sketch, does e good job. Ba tore there Is air in it at all limes. Results are good. John D Phillips Dayton, 0. CUSHION CHAMBERS at each, dead-end of (ho piping aystem help reduce noise. If these don't help. Install vibration dampers or short sections of flexible hose st random points to break up the continuous lengths of pipe. Don't place anchors loo close to dampeners or flex ible hoses. From CH's description it looks as though his flush valves close too quickly. Lowering inlet pressuro or adjusting valve is one way of preventing this trouble In the future. Mklvin Evans Chicago, IU. MOt ^Ctwei Cwttt * taaltorj g! ADJUST RUSH VALVES to doss _ and almost all or all water hammer end. Moat flush valves close sharply and there isn't too raueti ] can do ebout It in soma designs. CM can obtain a positive curt by stalling a pressure tank ol about lr capacity on tho inlet to sanitary sketch. Keep tank about 2/3 fall water end about 1/3 full of air. A! absorbs reverse-flow shock, may be |g Into the lank from the plant eompi air system, if desired. John J Cert Brooklyn, ti. M MAXIMUM SHOCK occuri at flash nli and faucet when valves close end suddenly stops. Best place to cubit shock is In the branch lines just ibi (Continued on page 220) -YOUR NEW PROBLEMS FOR MARCH- 1 li This Stack The Right Size? The steel stack for our new boiler It to ba 50-Jo. dio, 150-fi height above boiler-room floor. Boiler ( rated at 20,000 lb per hr. US prig, 353 F. Feed temperature It 212 F, gat leave* boiler at 585 F. Hiere I* no heat recovery. CO, leaving furaaee I* 14%, leaving boiler 13.8%. Louct expected ores dry ga* '12.3%, II, and moliiure In pulvariaod-eoal fuel 4.0, molature In air OJO, unburaed combuitlblo 1.3, radiation 1.2, unaccounted for 1.3%. Guaranteed boiler efficiency I* 78.4% | average draft loss through boiler I* 0.60 In. 11,0, required draft at entrance to firtl pais 0.1S In. 11,0, furnace draft needed at minimum rating 0.05 In. 11,0. Proximate fool aunty*!* 1st molature 2.88%, volatile -36.0, carboo 52.36. aah 8.76%. I don't think alack site recom mended to u* la right. Rave Potoor renders over ran Into a problem like this? What's beat way to cheek stack alseT la site recommended tometf--6R O Why Is Diesel 4 Piston Worn? One piston of oar 4-cyele 8-eyl 1000-Kp diesel Is worn oval about 0.013 In. on the thrnst ilde, and the rings are worn the same way. Liner shows normal wear with no coring. Recently we put In a new pis* ton end ran for throe hours. Then the wrist pin got hoi sad the piston scored the liner. Checklog the engine we foond that outside lubricator mpplyini oil to tho pistons was working right when scoring occurred. We now get a noise from (Ids cytb>* der that sounds like a plltoo flap. Since engine is only 11 maotbi old and all pistons are the cor' reel size we've wondering what I* causing oar trouble. Why did pistoo wear oval I* inch o short Umef What's best woy to repair piston and Uocrf How eat) we avoid this trouble la (his engine In the future?-- fPUl you help readers who sent as problems? Extra pay for photos or sketches RANT OPERATION AND MAINTENANCE SECTION ENGINEERED FOR YOUR PIPING JOB Two engineers--working together--ere responsible for every Industrial piping application that'uses Flexitallic Spiral*Wound Gaskets. One is the engtneer*lncharge. The other la the Flexitallic Gasket design engineer. Working together, they build a gasket for your piping installation ... to your specifications, Bach Flexitallic Gasket is engineered to specific conditions of thermal and physical shock, corrosion, or unusual joint stress by spiral-wound V-crimped plies of the required metal with alternating plies of the proper filler. This results in a resilient gasket having characteristics of o calibrated spring. Flexitallic Gaskets are at highest efficiency when bolted up cold ot predetermined load.' For all pressure/temper* ature ranges from vacuum to 4000 lbs., from extreme sub-zero to 2000 F. For all flange series from 150 to 2,500 lbs. For all standard joint assemblies. In four thicknesses for special requirements: .125', .175*, .250*, .285*. With Teflon filler for corrosive chemical conditions. Write ua your requirements . . . Flexitallic Gasket Compar^ 8th ft Bailey Streets, Camden 2, New Jersey. Representatives in prlnc{Qj)tiftte&. Consult your Classified Telephone Directory. ANNIVERSARY SPIRAL-WOUND OASKKTS PIPE FLANGES, PRESSURE VESSELS AND PROCESS EQUIPMENT Nol *11 niliiii *n PtozfulUt. Look lor th rmm PLBXfTALLtC iiampod Into tho mot* I (plrol of ivory gomrino rhtiullle Qoikot. Look fftr jforilofWo Bfuo In fukitl with oibootoo fitter. 137