Con­trolled force pneu­matic torque wrenches op­ti­mise speed and safety

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Pneu­matic torque wrench

sys­tems of­fer a clean, fast and non-im­pact way to tighten bolts and fas­tener as­sem­blies by a pre­de­ter­mined amount, op­ti­mis­ing joint in­tegrity and work­place safety, says high-pres­sure hy­draulic man­u­fac­turer Enerpac.

The com­pany says the easy-touse main­te­nance and fab­ri­ca­tion tools are use­ful to avoid ex­ces­sive tight­en­ing if there is a risk of fas­tener break­age, or where it may be­come too dif­fi­cult to re­move fas­ten­ers af­ter­wards. They are par­tic­u­larly handy, says Enerpac, in en­sur­ing that groups of fas­ten­ers are tight­ened evenly, so as to pro­vide safe and re­li­able joints for long-term me­chan­i­cal and struc­tural in­tegrity.

Be­cause of their sim­ple con­struc­tion and ab­sence of the ham­mer­ing vi­bra­tion com­pared with im­pact tech­nolo­gies – which can break or at least weaken wheel and flange studs – the lat­est fam­i­lies of re­li­able and light­weight pneu­matic wrenches are very use­ful and work­place-friendly in fac­tory, work­shop, work­site and pipe­line ap­pli­ca­tions where com­pressed air is read­ily avail­able. The low-vi­bra­tion de­sign re­duces op­er­a­tor fa­tigue and min­imises the risk of vi­bra­tion re­lated in­juries, par­tic­u­larly on the hand, says Enerpac.

“Con­trolled force is def­i­nitely the safest and most pre­cise way to go about tight­en­ing fas­ten­ers,” says Aus­tralasian bolt­ing au­thor­ity Andrew Marsh. “This is true whether you are us­ing pneu­matic torque wrenches to pro­vide torque of, say, 1000-8000 Nm, or us­ing high-pres­sure hy­draulics to ap­ply pre­ci­sion higher forces some­times up to six times greater than that,” says Mr Marsh, who is Na­tional Bolt­ing Man­ager for Enerpac.

Marsh has ex­ten­sive ex­pe­ri­ence with Enerpac’s pneu­matic, hy­draulic and me­chan­i­cal tools in ap­pli­ca­tions across in­dus­tries ex­tend­ing from man­u­fac­tur­ing, min­ing and en­ergy and con­struc­tion, through to oil and gas, pipe­lines, in­fra­struc­ture and civil en­gi­neer­ing.

He says dif­fer­ent types of con­trolled force tools are ideal for dif­fer­ent ap­pli­ca­tions, but pneu­matic torque wrenches such as Enerpac’s PTW range have built-in ad­van­tages for di­verse repet­i­tive tasks.

Mod­ern pneu­matic torque wrenches such as the PTW fea­ture a low fric­tion air mo­tor driv­ing a plan­e­tary gear box with a very high re­duc­tion ra­tio. The gear box fea­tures a re­ac­tion arm to ab­sorb the torque re­ac­tion. Un­like im­pact wrenches, a pneu­matic torque wrench is driven by con­tin­u­ous gear­ing and hence has no noisy and haz­ardous ham­mer­ing. This is why a pneu­matic torque wrench has an ex­cel­lent ac­cu­racy and re­peata­bil­ity. The com­bi­na­tion of air mo­tor with plan­e­tary gear guar­an­tees fast, safe and eco­nom­i­cal op­er­a­tion.

Enerpac’s new Pneu­matic Torque Wrenches – in max­i­mum torque ca­pac­i­ties from 1356-8135 Nm (1000- 6000 ft lb) – have an ad­di­tional im­por­tant ad­van­tage in that they share the global ser­vice, backup and re­li­a­bil­ity of Enerpac tools in wide­spread use through­out Aus­trala­sia and world­wide. They also fea­ture com­mon­al­ity of mo­tors and parts to fa­cil­i­tate main­te­nance in de­mand­ing in­dus­tries in­clud­ing min­ing, oil and gas, con­struc­tion, trans­port, ship build­ing, man­u­fac­tur­ing and power gen­er­a­tion

Ser­vice backup and prod­uct avail­abil­ity ex­tends from global and na­tional re­sources through to lo­cal and in­di­vid­ual work­site ex­pe­ri­ence of Enerpac’s ex­ten­sive net­work of ser­vice cen­tre op­er­a­tions com­ple­mented by lo­cal Enerpac Ter­ri­tory Man­agers.


“Enerpac’s one-stop, so­lu­tions-based ap­proach – con­tain­ing a full range of op­ti­mum tool op­tions in one com­pact range with proven ser­vice – is highly val­ued by com­pa­nies seek­ing time-sav­ing choice, con­sis­tency of qual­ity and trace­abil­ity of out­comes,” says Marsh.

The CE cer­ti­fied tools, de­liv­ered with a cal­i­bra­tion cer­tifi­cate to en­sure ac­cu­racy and safety, com­ple­ment the full global Enerpac ranges of con­trolled bolt­ing so­lu­tions for joint assem­bly, con­trolled tight­en­ing and sep­a­ra­tion.

Enerpac tech­nolo­gies span me­chan­i­cal, pneu­matic, elec­tri­cal and high-pres­sure hy­draulic (700 Bar/10,000 psi) tech­nolo­gies in­clud­ing hexag­o­nal and square drive torque wrenches, ten­sion­ers and com­ple­men­tary so­lu­tions-based tech­nolo­gies all avail­able from the one source.

“Be­cause of their cost-ef­fi­cient, sim­ple and rapid high speed con­tin­u­ous ro­ta­tion op­er­a­tion – us­ing stan­dard fac­tory and mo­bile com­pres­sors found across a huge range of in­dus­tries – Enerpac pneu­matic torque wrenches will be es­pe­cially suited to work­shop tasks and on-site ap­pli­ca­tions re­quir­ing speed and easy op­er­a­tion,” says Marsh.

Fea­tures and ben­e­fits of Enerpac pneu­matic torque wrenches in­clude: •Er­gonomic de­sign with weight­dis­tribut­ing han­dle and sim­ple shape pro­vid­ing easy hand­ing for repet­i­tive tasks while elim­i­nat­ing trap points for fin­gers and im­pact haz­ards with older, im­pre­cise man­ual tight­en­ing meth­ods. • Sim­ple op­er­a­tion – just set the air pres­sure and pull the trig­ger. Con­tin­u­ous ro­ta­tion means no time is needed to re-stroke tools, sav­ing time. • Low-vi­bra­tion de­sign to re­duce fa­tigue and the risk of vi­bra­tionre­lated in­juries, par­tic­u­larly hand (HAV) haz­ard. Plan­e­tary gear­box de­sign elim­i­nates ham­mer ac­tion. • Low- noise air mo­tor (un­der 85 dba) for quiet, con­sis­tent per­for­mance for in­door and out­door ap­pli­ca­tions. • Com­mon to all mod­els, the proven air mo­tor means fewer parts need to be car­ried by ser­vice cen­tres. • High com­mon­al­ity of drive and re­ac­tion arm op­tions for lower in­ven­tory and speed­ier main­te­nance. • Con­ve­nience fea­tures in­clud­ing eas­ily ac­ces­si­ble tight­en­ing/ loos­en­ing switch and stan­dard 3m hose and stan­dard re­ac­tion arm, com­ple­mented by a wide as­sort­ment of op­tional cus­tom arms and ac­ces­sories. • Avail­abil­ity with or with­out stan­dard eas­ily por­ta­ble fil­ter/reg­u­la­tor/ lu­bri­ca­tors to en­hance re­li­a­bil­ity and dura­bil­ity un­der de­mand­ing ser­vice con­di­tions. Ap­pli­ca­tions of Enerpac PTW torque wrenches in­clude:

Min­ing and Trans­port – Fixed plant and equip­ment, track main­te­nance, un­der­car­riage main­te­nance, wheel and sus­pen­sion main­te­nance, shovel main­te­nance, trays, pins, as well as flota­tion cells, mill lin­ers, process equip­ment in­clud­ing screens, crush­ers, stack­ers, re­claimer, diesel en­gines, pumps, rail­way tracks, pin­ions, diffs. Power Gen­er­a­tion and Con­struc­tion/In­fra­struc­ture Projects – In­clud­ing hy­dro, fos­sil, wind, so­lar ar­ray po­si­tion­ing and tur­bine bolts, foun­da­tion bolts, bear­ing bolts, tur­bine cas­ings, blades, and tower seg­ments in­clud­ing crane tower. Oil and Gas, Metal In­dus­try, Wa­ter, Waste Wa­ter and Pro­cess­ing Equip­ment – In­clud­ing pipe flanges, valves, heat ex­chang­ers, man-way cov­ers, blow out pre­ven­ter (BOP), boil­ers, Christ­mas trees, pres­sure ves­sels, off­shore plant and in­fra­struc­ture. Man­u­fac­tur­ing, Fab­ri­ca­tion and Process – in­clud­ing steel mills, pa­per mills, heavy man­u­fac­tur­ing and process plants, pumps, fur­naces, bear­ings, gat valves, rollers, crankshafts and cou­plings, boil­ers, con­densers, com­pres­sors, heaters.

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