Slew bear­ing bolt­ing time rad­i­cally cut

DEMM Engineering & Manufacturing - - HYDRAULICS -

New gen­er­a­tion hy­draulic bolt fas­ten­ing tech­nol­ogy de­ployed at an Aus­tralian iron ore port has en­abled op­er­a­tors of a 5,000tph (tonnes per hour) ship loader to ten­sion bolts dur­ing slew bear­ing re­place­ment more than five times faster than by us­ing con­ven­tional torque­ing or haz­ardous man­ual meth­ods.

Seventy-two spe­cially de­signed Tech­no­fast Ez­iTite Hy­draulic Nuts were used at the Karara Ger­ald­ton Port to ten­sion grade 12.9 studs that se­cure the slew bear­ing of the loader, which is a vi­tal ma­te­ri­als han­dling in­stal­la­tion with long travel, luff­ing and slew­ing ca­pa­bil­i­ties.

The Ez­iTite Hy­draulic Nuts – si­mul­ta­ne­ously tight­ened in groups of four to fur­ther en­hance pre­ci­sion, speed and safety and cut load scat­ter – are part of a glob­ally proven range of Ez­iTite Hy­draulic Nuts used in mission-crit­i­cal ap­pli­ca­tions where speed, pre­ci­sion and avoid­ance of down­time are para­mount.

Ez­iTite Hy­draulic Nuts are rapidly ap­plied by be­ing placed onto bolt studs and hy­drauli­cally ac­tu­ated to stretch the bolt to the pre­cise ten­sion re­quired then lock­ing it in place me­chan­i­cally with a lock­ring. The re­verse pro­ce­dure per­mits equally rapid dis­as­sem­bly when it is even­tu­ally re­quired.

Ap­pli­ca­tions range from nu­clear and con­ven­tional gen­er­a­tors through to ro­tat­ing, vibrating, tur­bine, heat ex­changer and min­eral pro­cess­ing equip­ment in­clud­ing stamp­ing, crush­ing, dragline boom sup­ports, high pres­sure grind rollers, hoists and con­veyor drives, mo­tors and shells.

Tech­no­fast CEO, John Buck­nell said Ez­iTite Hy­draulic Nuts such as those de­ployed at Karara are ideal for ten­sion­ing all of the studs on a flange, joint or cover si­mul­ta­ne­ously, load­ing en­tire groups of fas­ten­ers at once. This si­mul­ta­ne­ous ten­sion­ing gives an ex­tremely ac­cu­rate and even load onto the flange/joint, en­hanc­ing its long-term se­cu­rity, safety and re­li­a­bil­ity.

At Karara, the Ez­iTite nuts were sim­ply placed in po­si­tion by hand then groups of four were linked to­gether and pres­sur­ized si­mul­ta­ne­ously, re­duc­ing bolt load scat­ter and of­fer­ing dra­matic time sav­ings.

Buck­nell said the us­ing torque wrenches, for ex­am­ple, this would have taken about 30 min­utes to ten­sion four bolts, whereas the Ez­iTite fas­ten­ers com­pleted the task in less than five min­utes. Also, there are no pinch points as­so­ci­ated with Tech­no­fast tool­ing and it does not need to be han­dled whilst be­ing pres­surised, elim­i­nat­ing in­her­ent health and safety haz­ards.

The Ez­iTite Hy­draulic Nuts also over­came bolt load scat­ter prob­lems com­monly en­coun­tered with stan­dard slew bear­ing re­place­ment pro­ce­dures us­ing torque wrenches. Bolt load scat­ter, due to a sin­gle bolt be­ing fas­tened at a time, could have caused un­due wear on the slew bear­ing, lead­ing po­ten­tially to down­time on this par­tic­u­lar ap­pli­ca­tion and on scores of oth­ers where slew bear­ings are mission-crit­i­cal.­quiry #150422.

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