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ftwltaufy 90, 1949 .,
Asbestos Cokii ttan'i (or Cniimr NfM Index t luaa Sonrlco DiU UtUr 69*9
Prioprietary Close S
Scapias of datarleratad gasket sheets from a crossover pipe application have
Was rafarrad to Lastar (or review. the broken places of oabaatoa gaskets
ware atda froo Oarlock style #900 abaota. Ibe atslua calculated (all tool
crossover eteea conditions (or. the partlcolar onlt ware Sip pala sal 7NV
Ibis salt baa boon operating near (all load or above 10CrW.\
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because of thla gaakat problem,''tba -writer has contacted a nearer of major'
oabaatoa gaakat conpantee; and tba rstings-of tbelr top quality asbestosgbeeta
ora Hated on the attached table.-'/Aiso shown on tba tablar An tb* Allowable
aarvlea te^eratnres for-tha 'gaaketst-. Pisses keep la blatikaf Ovao^lrttb' tbe
boat avatlabla asbestos ahaata,'owetsssful operation of oabaatoa gaakati ot
taoperaturns above 700.P. depends oecorrect bolt set-up-and subsequent,,ta-
tlghtenlng of tba joint, Ibe following dissuasion axplalaa why. , .*
1, T. Natallnrgical lagineoriag have-tested three aabaatoa gaakat natorlnlai Johoa-Ksnvllle #60, Anchor rocking "Tanril". nod Oarlock #7793 (equivalents! #900). Iba throe gaakat sheets warn coup*eased to 9,000 pal and than ospooed to 700 *F. (or 6$ boora. All sparineas tested beeone brittle after boating.
Oasket suppliers are wall aware of the (act that even a prenlms quality-'' ' asbestos sheet looses nocb of Its taasila strength at temperature above 700F, therefore, to successfully seat the internal pressure In a pipe at high teaperature, an even and adequate bolt load on the gasket la extremely Inportaat to .set up tbs bolting correctly whan making op a flanged Joint. Practically all asbestos gaskets recover only AOX after being coapresaed to 9,000 pat. Xonglna what could happen If the bolts in a flanged Joint were Incorrectly tightened to
49,000 pel without alternating from aide to aids across the disaster. Ibla could cause an uneven Initial compression on the gasket, and the initially I.' over coapresaed areas can vary well bacons a leakage problcn because of tba Inability of asbestos gaskets to recover cospletely.
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'i-f&y&atfr 'i Tone 9506 %
Produced 3/93
2804551-8
Produced 3/93
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Iota: "Avarapa of vlth-tha-grain & acroaa-graln tanalla atrangtha. (A) V POS 42251A8 anaclflad 7S0*F A A00 PS I rating#. Carlock #7021 * #900 do not moot tha ipte. (B) 7amat Valkar A Co. Led. la an Engllah Co. rapnaaantad toy *to**y Hachinary Ouppllaa Co., Xoe,"
30$ East 47th atraat Hav York, H.Y. 10017 (C) Tumtr Brochars Co. Led. la an Engllah Co. rajrraaantad toy "XAY Aatoaatoa Co", Norton A
Pennington Avo., Norton; Pa. 19070.
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(S) Tho Anchor Packing Co., Phlla.Pa. 19100; Argo Aahaaeoa A Bubbar Co., Oataont.Pa. 13109: Colllaa
Packing Co. Inc., Phlla.Pa. 19100} Carlock Im Palayra.E.Y. 14322} Jobna-Haarllle, IwYaA. 1.7.
10016; BaybatcoaManhattan, Inc* Nanhala, Pa. 17345.
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Produced 3/93