Keep dust out of the work­shop

DEMM Engineering & Manufacturing - - PRODUCT WATCH -

Many pro­cesses in the work­place gen­er­ate par­tic­u­late that is ei­ther toxic or a sig­nif­i­cant ‘nui­sance’. The con­se­quences are health and safety is­sues, maybe the po­ten­tial for fire or ex­plo­sive risk, or just a messy residue that lim­its pro­duc­tiv­ity.

It is crit­i­cal the con­tam­i­nate and par­tic­u­late is cap­tured be­fore es­cap­ing and spread­ing through­out the work­shop en­vi­ron­ment to pro­tect all em­ploy­ees work­ing in the area.

Cap­ture at-source pro­vides con­trol and con­fine­ment of par­tic­u­late be­fore it can es­cape and there­fore re­sults in a clean work­ing en­vi­ron­ment and pro­tec­tion of all em­ploy­ees work­ing in the work­shop vicin­ity.

The es­cape or dis­per­sion of par­tic­u­late from a work­place process is an in­ter­est­ing study. Eg­mont Air use spe­cial for­mula to cal­cu­late the rate of dis­per­sion which takes ac­count of fac­tors such as pro­jec­tion ve­loc­ity, con­tam­i­nate den­sity, ex­ter­nal in­flu­ences and prox­im­ity to de­sign a dust and fume ex­trac­tion sys­tem to suit each in­di­vid­ual ap­pli­ca­tion

Many grind­ing, pol­ish­ing and cut­ting ac­tiv­i­ties pro­pel con­tam­i­nates into the at­mos­phere at high ve­loc­ity, it is there­fore crit­i­cal that a cap­ture hood is de­signed and strate­gi­cally placed so that con­tam­i­nates are di­rected into the hood where the ex­trac­tion sys­tem can con­vey the par­ti­cles to a cen­tral col­lec­tor.

Other par­ti­cles are re­leased ‘pas­sively’ (without in­er­tia) and this al­lows more f lex­i­bil­ity in de­sign­ing an ex­trac­tion sys­tem to suit the process. Of­ten the air­flows will need to be care­fully spec­i­fied to cap­ture the smoke (eg weld­ing smoke) without af­fect­ing the qual­ity of work (eg dis­turb­ing shield­ing gasses).

Smoke and fume from heated pro­cesses (such as foundry and ex­tru­sion ap­pli­ca­tions) gen­er­ate a ‘bil­low­ing effect’ where gases rapidly ex­pand and spread through the fac­tory. High air vol­ume must be spec­i­fied to cap­ture and re­tain the smoke but prox­im­ity must be con­sid­ered so as not to pro­vide any un­wanted ‘cool­ing’ on the process. In­su­lated ex­trac­tors, spark-traps, cold-air di­lu­tion may need to be em­ployed to ef­fec­tively fil­ter the smoke and fume from heated pro­cesses.

Par­tic­u­late den­sity is an ob­vi­ous fac­tor in de­ter­min­ing the best ex­trac­tion method. Vis­i­ble and heavy dust ap­pli­ca­tions may re­quire vary­ing air­flow cap­ture ve­loc­i­ties as well as ap­pli­ca­tions gen­er­at­ing odours or gasses, which dis­perse very rapidly.

Eg­mont Air place high im­por­tance on com­pe­tent on-site eval­u­a­tion of each in­di­vid­ual ap­pli­ca­tion.

A free on-site eval­u­a­tion by one of Eg­mont Air’s trained and ex­pe­ri­enced con­sul­tants will iden­tify the spe­cific cause and ap­pro­pri­ate so­lu­tions to re­duce air­borne dust and fume in the work­place.

Chang­ing work pro­cesses, mod­i­fy­ing guards, im­prov­ing ex­trac­tion and/or ven­ti­la­tion are work­able op­tions based on fac­tors such as op­er­a­tor move­ments, ma­chin­ery used, ma­te­rial com­po­si­tion, rate of dis­per­sion, etc. Each spe­cific ap­pli­ca­tion can be in­de­pen­dently eval­u­ated so the best so­lu­tion is pro­vided with the most ad­van­ta­geous out­comes and re­sults.

Eg­mont Air of­fers con­sul­ta­tion and pro­fes­sional ad­vice for any dust or fume ex­trac­tion is­sue.

Con­tact: Eg­mont Air now on 0800 781 200 or www.egmon­tair.co.nz for more in­for­ma­tion or a free cat­a­logue.

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