MATERIALS HANDLING PUMPS TACKLE U
ABRASIVE MATERIALS
A robust rotary lobe pump design enables a six times higher service life of pumps handling abrasive ceramic slip
ntil 2013, a German ceramics manufacturer used a progressing cavity pump for filling and recirculation of the storage tanks
for grog and ceramic slip. Te wear parts of this pump, however, had to be replaced every three months due to the highly viscous and abrasive substance. To minimise service times and enable more economical production, Netzsch suggested replacing the unit with a special rotary lobe pump from the Tornado T2 range. Te
T.Proc is designed for a long
The ceramics manufacturer switched over to a Tornado
T.Proc pump
38
www.engineerlive.com
service life with minimum wear, so that it can also convey highly abrasive compounds without problems. Tis is made possible by the combination of the operating principle and a special material pairing: instead of conventional elastomer lobes in a metal housing, this pump comprises two steel lobes rotating in a replaceable rubber housing insert. Tis achieves a higher durability of the moving components because steel is less susceptible to material fatigue from dynamic forces than plastic elastomer. In addition, the interior is designed without dead space so no slip residue can adhere. Due to the clearly reduced wear and the longer service life of one and 1.5 years, respectively, the ceramics manufacturer has now changed over its entire production to the Tornado
T.Proc. Te ceramic production process offers a range of forming processes that can be categorised into the basic types of pressing, plastic forming and casting. For ceramic slip casting, for example, a watery suspension is poured into a porous mould that drains liquid from the slip. Tis produces a solid layer, the so-called cullet. Slip and grog are initially kept in storage tanks. Due to the viscous and abrasive medium, the German ceramics manufacturer used a Nemo progressing cavity pump from Netzsch for filling and recirculating ceramic slip until 2013. “We initially recommended this model to the ceramics manufacturer as we have had very positive experiences with mineral suspensions, such as plaster, mortar or concrete primer,” Egon Grainer, team leader Paper & Chemicals, explains. Due to the high level of abrasiveness of the conveyed grog slip, however, it turned out that the wear parts – rotor and stator – still had to be replaced every three months and the shaft sealing every six to eight months. Tis caused very long service periods and accordingly high costs. To increase the efficiency of the system,
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68
