Document ymbpNLM9OE6rpz3BaG8xe0KX6

dAitto. 4 LEAD INDUSTRIES ASSOCIATION 0 CAST 41h STRICT NCW TORK IT. N. V. ad. May 6, I960 SUBJECT: IEAJVASBSaTOS PADS ISOLATE VIERATICW OF ROOF-TOP COOUBO TCWEH To Members of the Lead Industries Association and Their Engineering and Furchasing Personnel: A copy of the reprint, "Isolate Vibration of Roof-top Cooling Tower" Is attached. The article was dereloped by the LIA staff and appeared In LEAD quarterly at about the sane time It was published by "Plant and Power Services Engineer* (circula tion of about 60,000). A limited number of reprints have been purchased and are available to members while they last. We hope that members will fully investigate the possibility of using this lead product In their own operations. Very truly yours. Att. i 'ES. Upgl s s ij v Llfv22fc01 Isolate vibration of roof-top cooling tower KcpmHd from MtrcJl I960 PLANT tod POWER SERVICES ENGINEER LEAD INDUSTRIES ASSOCIATION 292 Avmi N Yt 17. PW Yt i y r I f r s I N 1968.01 .. ...................... y M LIA22602 jfiL hftm. Are you plagued with vibration? If vo, rood Sow Now York ikyKropor %not load-asboitoi pads to . Isolate Vibration of Roof-top Cooling Tower K by ik* Hrt*y One of the lust rnslalUtions uMnK Wad anti-.thrat(</n pads to damp the vibra't..n created by air condition* *.ng equipment was made on the rool ol the new J5-story* , ir.ee building :>t STS Lcxingt.*n Ave,, New York City. 7%e rool-top cooling tower - with a met weight ol 205,t0 lb -- is supported on 10 teel angle-columns resting on the buildings own struc tural girder*. Because vibra tion in the cooling tower would be transmitted to the building structure. Ican-a*bentos pads were placed be tween the base of the cooling tower's supporting columns and the structural steel. Steel billets distribute the load over the pads. The tower's corner posts are on pads measuring 8** by 8~ and the remaining col umns are on pads which measure 8" by 14". The ten pads provide an antJ-vibration bearing surface cf ?28 ?q ft for the 2^5,000-lb tower -- or about 220 lb per .q in. Engineers teported that the method of construction used for the supports saved con siderable time and expense in that they could be placed in position while the steel work was in progress rather than wailing for the concrete to be poured and then placing the footings. The cooling tower b equipped with three CO-hp. 1800-rpm motors with spiral hcvr! gears driving a 12bladrd. adju>table-piteh fart at 202 rpm. and a water pump of 6000-gpm capacity. As revealed .v a check this past . tuner, tjse vibration created by thu equipment while operating at peak load w as rfl xrtively damped by the lead asbes tos anti vibration pads. (More information on antivibration pads may be ob tained from Lead Industries Association. Dept. PdrI'SE.293 Madison Avr.. New York 17. New York 1 4 Ki if caaTtaa bi p*4\ F*di Im4 An (* fV* d*r*h m Non hardnmg Cunt pound S^eet steel 4** steel Jr'Jn Supporting COOling tOAff *rrm y~ Built Up foot V* Conoete V:W -- S(l txiw r tt..k -Ltjd jn|i ..txitior. ptd I" lh<k TV* .,< pU<*4 W> tw** tW Ifvw't l***1 dnN<b*+* a-* ft* 33 30 c 34 Aide f1jie btm