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Hallite Seals
Surface roughness Surfac urfac e roughness roughness has a very important infl influenc uenc e o n the life a nd leakag e p erforma erforma nce of a rec ipric pric ating sea sea ling system.
AIR Rq Ra Mea n line line Rt
M ETA L
Bore surface finishes can be more problematic The typ ica l me thod s of o bt aining a b ore fini ma rised in the figure figure b elow. Draw Draw n over ma tubing, as is, ca n be ad eq uate , or a po tential dep ending on the a ctua l sur surfac fac e texture texture a chi the a pp lic ation. Increa sing ing use use is be ing m ad Smo oth Inside nside Diam ete r (SSID) DOM tub ing, bu c irc irc umsta umsta nc es, es, ma inly inly whe n the sea l is is b eing d the pressure, it can lead to wear of the seal thr erosion. erosion. Suc h DOM tub ing req req uires uires c areful s The c onsis onsistenc tenc y of roller roller burnis burnished or hone d p referred . Skive kive d a nd roller b urnishe urnishe d tub ing i smo ot h (less tha n 0.1µm 0.1µm Ra ) (4 µin CLA) and may be too smooth for rubber eleme nts in som e a p plica tions. tions. True honed du c ed b etw ee n (0.1 and 0.4 0.4 µm µm Ra) (4-16 (4-16 µ most expensive, but has the best finish.
Note : The The vertica l sca sca le is 40 times the Horizonta Horizonta l sca sca le
Static surface finishes
Definitions Ma ny pa ram eters c an be used used to d esc esc ribe surfac urfac e finis finishes and the se a re exp lained in IS ISO 4287 and ISO 4288. 4288. Those hose in m ost ost c om mo n use use in the fluid fluid po we r ind ind ustry ustry include:Ra, w hic hic h is de fined fined as the arithme arithme tic tic al me an de viation viation of the asses assess sed profile. profile. The inc h eq uivalent p ara me ter is is CLA CLA (c entre line a verag e). A surfac e finis finish o f 0.4 µm µm Ra is exac tly equ ivalent to 16 µin CLA. CLA. Rt, wh ich is the to ta l height o f the p rofile.T rofile.There here is no ma thema tic tic al relations relationshi hip p b etwe en Ra Ra and Rt. Rq, w hic hic h is the root mea n squa squa re d eviation of the a ssess essed p rofile. rofile. The e q uiva lent t erm in inc hes is is RMS (Roo (Roo t Me a n S Sq q ua re). The Rq Rq (RMS) (RMS) of a surfa surfa c e is approximatly 10% greater than the Ra (CLA) value.
The sta sta tic sea ling ling surfa surfa c e finish finish mu st no t b e ign the c ontrol of leakag e. Gene rally, ally, these these a re fin and should b e free from c hatte r marks marks. HOT DRAWN TUBE
