Kill bac­te­ria, not bear­ings

DEMM Engineering & Manufacturing - - FOOD -

Food and bev­er­age pro­duc­ers must take an un­com­pro­mis­ing ap­proach to hy­giene, health and safety as a key foun­da­tion of busi­ness. To ac­com­plish these goals, good so­lu­tions are needed to match ex­pec­ta­tions, while at the same time re­duc­ing main­te­nance and op­er­at­ing costs. SKF’s food line Y- bear­ing units have been specif­i­cally de­signed to do just that.

The food and bev­er­age in­dus­try is a par­tic­u­larly chal­leng­ing area for ma­chin­ery as pro­duc­tion ar­eas cover nearly ev­ery type of en­vi­ron­ment such as high heat, ex­treme cold and hu­mid­ity. Ad­di­tion­ally, ma­chin­ery is fre­quently ex­posed to abra­sive and ag­gres­sive con­tam­i­nants and chem­i­cals from the process and strict clean­ing regimes re­quired by reg­u­la­tions. Fre­quent high- pres­sure wash down with caus­tic an­tibac­te­rial cleans­ing agents can of­ten be the root cause of bear­ing fail­ure rather than race­way fa­tigue.

SKF Food Line stain­less steel insert bear­ing units are pur­pose­fully de­signed for hy­giene and fit­ted with SKF high per­for­mance 2RF seals are an ef­fec­tive and proven multi- bar­rier de­sign that pre­vents con­tam­i­na­tion and re­tains the lu­bri­cant dur­ing high- pres­sure wash downs, keep­ing wa­ter and de­ter­gents out of seal con­tact ar­eas.

The op­er­a­tion of these units in wet, abra­sive or wash down en­vi­ron­ments of­fer main­te­nance-free op­er­a­tion re­sult­ing in sav­ing time, money, im­prov­ing sus­tain­abil­ity and re­duc­ing en­vi­ron­men­tal im­pact.

Lubri­cated for life from fac­tory with a high- qual­ity NSF ap­proved SKF food- grade syn­thetic grease, it re­sists washouts even dur­ing fre­quent high- pres­sure wash downs and can be used in ap­pli­ca­tions where op­er­at­ing tem­per­a­tures range from –15 to +120°C.

The com­pos­ite hous­ings are a ther­mo­plas­tic with steel coils em­bed­ded in the hous­ing giv­ing a ra­dial break­ing load far greater than the static load rat­ing of the bear­ing, and pos­si­bly the high­est frac­ture strength of any com­pos­ite unit avail­able.

A flat base en­ables the unit to meet flush with its mount­ing sur­face, elim­i­nat­ing gaps which other­wise are po­ten­tial ar­eas for bac­te­ria to har­bour and grow, while stain­less steel bolt hole in­serts pro­vide added strength to each hous­ing foot.

To com­ply with health and safety reg­u­la­tions, the com­pos­ite ma­te­rial and stain­less steel housed insert bear­ing units can be sup­plied with end cov­ers pro­vid­ing ad­di­tional pro­tec­tion against wash down with closed end cov­ers tested to with­stand a 10 MPa (100 bar) pres­sure wash as well as for com­plete se­cu­rity and op­er­a­tor safety against ends of ro­tat­ing shafts. An op­tional drain hole is part of the end cover de­sign.

The com­mon prac­tice in wash down en­vi­ron­ments of greas­ing bear­ing units fre­quently, of­ten daily, is nec­es­sary pri­mar­ily to purge wa­ter and con­tam­i­nants out of the bear­ing which have en­tered through the seals. Since SKF Y- bear­ing units re­quire no re­greas­ing with the seal­ing sys­tem keep­ing con­tam­i­na­tion out, they also do not dis­charge used grease from the seals. This elim­i­nates a ma­jor source of waste­water con­tam­i­na­tion, re­sult­ing in a cleaner plant en­vi­ron­ment and lower dis­posal costs for users and re­duces the chance of both in­tro­duc­ing con­tam­i­na­tion dur­ing greas­ing and dam­age to the seals from over pres­suris­ing the bear­ing units.

If a site has 100 bear­ings for ex­am­ple which are lubri­cated on a daily main­te­nance cy­cle on aver­age two grams of lu­bri­cant per bear­ing purge and takes one minute per bear­ing, this equates to:

• 1.4 kg per weekly main­te­nance cy­cle.

• 73 kg of lu­bri­cant per year.

• 600+ main­te­nance hours per year.

The cost of main­tain­ing a bear­ing can eas­ily out­weigh the ini­tial pur­chase price.


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