Ro­tor wear elim­i­nated with pump

DEMM Engineering & Manufacturing - - MATERIALS HANDLING -

The Beetham, Cum­bria plant of BillerudKorsnäs in the UK has re­placed a pro­gres­sive cav­ity (PC) pump with APEX10 hose pump tech­nol­ogy from Wat­son-Mar­low Pumps Group on an ap­pli­ca­tion dos­ing abra­sive pig­ment in kraft pa­per man­u­fac­ture.

The move has solved the prob­lem of sta­tor and ro­tor wear on the PC pump that was lead­ing to a drop in per­for­mance, down­time, and the need for reg­u­lar main­te­nance.

At Beetham, kraft pa­per is pro­duced in quan­ti­ties of around 34,000 tonnes-a-year across three shifts by 140 peo­ple. In an ap­pli­ca­tion in­volv­ing the dos­ing of pig­ment into pa­per stock, the plant was ex­pe­ri­enc­ing dif­fi­culty with its PC pump.

“We put the pig­ment into the stock prepa­ra­tion end of the pa­per ma­chine to in­tro­duce a colour shade to cer­tain grades,” says en­gi­neer­ing man­ager Tony Hal­head. “We dose very low, pre­cise vol­umes as the shade is crit­i­cal. How­ever, the abra­sive na­ture of the pig­ment was caus­ing the sta­tors and ro­tors in our 1-inch PC pump to wear, lead­ing to a drop in per­for­mance.”

As a re­sult, the en­gi­neer­ing team at Beetham would have to speed up the three-phase in­verter in the con­trol box to main­tain f low rates at the re­quired lev­els, caus­ing even faster wear­ing. How­ever, if the drop in per­for­mance went un­no­ticed, it could lead to a vari­a­tion in shade and to re­jected pa­per. On a long pro­duc­tion run this could be very ex­pen­sive.

“We were ex­pe­ri­enc­ing dips in per­for­mance on a reg­u­lar ba­sis so we de­cided to ad­dress the sit­u­a­tion, par­tic­u­larly when also con­sid­er­ing the down­time and main­te­nance is­sues,” says Hal­head. “Other Wat­son-Mar­low pumps were be­ing used on site suc­cess­fully so we thought they would be a nat­u­ral first port of call.”

Wat­son-Mar­low rec­om­mended the use of an APEX10 hose pump. APEX pumps are en­gi­neered for max­i­mum up­time and process con­ti­nu­ity. Through de­sign at­tributes such as heat dis­si­pa­tion, pre­ci­sion ma­chined hose el­e­ments and op­ti­mised hose com­pres­sion, APEX pumps re­duce hose el­e­ment fa­tigue com­pared to other hose pumps and when a hose re­place­ment is re­quired, this is a quick task which can be car­ried out in-situ by main­te­nance staff.

The ben­e­fit for APEX users such BillerudKorsnäs is re­duced main­te­nance in­ter­vals, lead­ing to de­creased cost of own­er­ship. Op­er­at­ing and inventory costs are also less, as a sin­gle hose el­e­ment is all that needs to be re­placed.

BillerudKorsnäs in­stalled two APEX10 mod­els in Fe­bru­ary 2014, one duty and one standby. The pumps are fixed to a mo­bile skid and piped with valves to speed changeover. Of­fer­ing a 14 rpm, 0.18kW mo­tor suit­able for VSD con­trol, the f low rate is 25-30 litre/hr when us­ing a green pig­ment, and 10-15 litre/hr for a blue pig­ment. The pumps are f looded suc­tion (600mm head into pump via 2.5 me­tres of 1/2” f lexi hose). Dis­charge is via 18 me­tres of 1/2” f lexi hose in­clu­sive of an 8.5 me­tre lift into the pa­per stock tank.

“Since in­stal­la­tion the APEX10 pumps have been run­ning re­li­ably in a 24/7 op­er­a­tion,” says Mr Hal­head. “We are now con­sid­er­ing the re­place­ment of other PC pumps on site with APEX mod­els.”

Con­tact: 09 273 3166 or email: en­quiries@ wmbpumps.co.nz

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