ROWA-MCROWA-MCC in SICcast®

MINERAL CAST PUMPfor highly abrasive andcorrosive fluids

Flue-Gas Desulfurization

Waste Incineration Plants

Fields of Application:

For pumping abrasive and corrosive fluids there has been an increasing tendency to employ non-metallic materials. Having identified this trend in the early 90s already, DÜCHTING PUMPEN successfully developed and tested a new material that would best suit these operating conditions. With SICcast®, a mineral-cast material produced at our affiliate SICcast® Mineralguss GmbH & Co. KG, we have offered a reliable and cost-effective material for a number of years now. The major advantage of SICcast® is its excellent chemical resistance in combination with its exceptionally high wear-resistance which far exceed that of traditional high-alloyed chrome nickel steels or any other nickel alloys.

Centrifugal pumps of the ROWA-MC / MCC series are derivatives of our successful and widely-used metallic ROWA series. In these two new series, DÜCHTING PUMPEN has managed to keep all of those parts which are in contact with the liquid free of metallic components by using the mineral-cast material SICcast® and our DÜTEC® mechanical seal. SICcast® is a compound of chemically resistant and thermally-stable epoxy resin that is mixed under vacuum with silicon carbide (SiC).

Coal, Ore and Potassium Mining

Chemical Industry Food, Metal and Fertilizer Industry

At present, this versatile material can be used for numerous applications, except for strongly basic environments and for fluids containing bigger particles (>1mm). In order to further improve its chemical resistance, the bonding agent is continuously being refined.

Consequently, the fields of application for theROWA-MC / MCC series are highly abrasive or abrasive-corrosive operating conditions, which can, for instance, be found in:

• Flue-Gas Desulfurization

• Coal, Ore and Potassium Mining

• Waste Incineration Plants

• Chemical Industry

• Food, Metal and Fertilizer Industry

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ROWA-MC / ROWA-MCC SeriesMineral cast pumps in SICcast® for highlyabrasive and corrosive fluids

3

Design Features:

Pumps of the ROWA-MC series are horizontal radially-split, single-stage centrifugal pumps. Their closed, multi-vane impeller is fitted with three-dimensionally curved vanes.

The suction flange is positioned axially, the discharge flange either radially to the top (up to ANSI 6”) or tangentially upwards (starting from ANSI 8”). The antifriction bearings are oil-lubricated. Typically, pumps of the ROWA-MC / MCC series are fitted with a single-acting DÜTEC® mechanical seal.

This patented mechanical seal was especially designed and optimized for use in centrifugal pumps of the ROWA series and is yet another innovative development of DÜCHTING PUMPEN.

The ROWA-MC pumps can, however, also be equipped with double-acting mechanical seals. In this case, a metal free solution is, of course, also available.

Discharge Flange Width: ANSI 1¼” - 40”

- Capacity: up to 70,500 gpm- Delivery Head: up to 400 ft.- Medium Temp.: max. 300°F

ROWA-MC 80-315

Material Properties & Manufacturing Process

SICcast®:The material is primarily made of silicon carbide (SiC) which is mixed under vacuum with epoxy resin (EP) as a bonding agent and is then cast into molds.

The Components:SiC:At high temperatures, silicon minerals (Si), which exist as SiO2, combine with carbon (C) to form silicon carbide (SiC) with a hardness of 9.7 on Mohs’ scale (diamond=10). SiC is made up of particles of different sizes which allows a high packing density. By adding epoxy resin as a bonding agent, it becomes possible for this material to be cast in molds.

EP:Since epoxy resin is the basis for most two-component adhesives and is characterised by a high chemical resistance, it is the ideal partner for binding the SiC particles.

The Result:The result is a non-metallic, anti-magnetic, noise-absorbing and vibration-reducing material with a diamond-like hardness and a thermal stability up to 300°F. Due to its chemical composition, it is not as brittle as sintered SiC and less sensitive to temperature shock and impact.

Mixing underheat and vacuum

Casting inopen forms

Heat treatment

De-Molding Tempering Cleaning

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ROWA-MC / ROWA-MCCReduction of Life-Cycle Costs

Everyone who operates industrial plants is determined to maximize the operating life of the components used and to increase the intervals in which wear parts have to be exchanged, in order to increase plant availability and to reduce operating and maintenance costs at the same time.

Centrifugal pumps are subject to considerable abrasion, erosion and corrosion and thus require a continuous exchange of wear parts. Pumps made of SICcast®, however, have helped for years now to reduce these maintenance costs noticeably as a result of their extremely high resistance to abrasion and corrosion.

1.4464 (duplex stainless steel)

1.4464 (duplex stainless steel) SICcast®Impellers of two absorber circulation pumps after an operating time of 11,000 hrs. (left) and 24,000 hrs. (right) in the same operating environment.

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SICcast®Suction-side wear plates of the same absorber circulation pump after an operating time of 16,000 hrs. each.

SICcast® volute casing

SICcast® casing cover

Bearing Bracket

DÜTEC® mechanical seal

SICcast® impeller

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ROWA-MC SeriesANSI 1¼” to 1 to 16”≥ ANSI 8” with suction side wear plate

Double-acting mechanical seal (back to back)

Single-acting mechanical seal (DÜTEC®)

Stationary ring (SiC)

Springs locatedoutside the liquid

Flushing out

Flushing in

Burgmann MG 1

Rotating Ring (SiC)

ROWA-MCC SeriesANSI 20” - 40

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SICcast® wear plate

SICcast® impeller

SICcast® / cast ironvolute casing

SICcast® casing cover

Single acting DÜTEC®

mechanical seal

Bearing Bracket

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From a discharge flange width of 20“, DÜCHTING PUMPEN brings into play the ROWA-MCC series (MCC=Mineral Cast Compound), e.g. for big absorber circulation pumps in flue gas desulfurization plants. In contrast to pumps of the ROWA-MC series which are built in unit-construction, the design of the ROWA-MCC series allows for a considerable reduction in weight and thus also an optimization in costs. All parts of the volute casing which are in contact with the liquid are made of SICcast®. Since the material is directly cast into the respective volute casing, it forms one unit.

ROWA-MC SeriesPerformance Data 50 Hz

ROWA-MC 1,000 rpm

ROWA-MC 1,500 rpm

10

80-400

125-315

80-20065-200

50-200

40-20040-160

100-200

80-160

32-160

150-280150-250

125-250

100-250

80-250

65-250

50-250

40-250

32-250

200-315

150-315

80-31565-315

50-315

40-315

300-500

250-400

200-355

150-400

100-400

50-400

10 100 1000

0

20

40

60

80

100

H [ft]

Q [USgpm]

1 10 100 10000

5

10

15

20

25

30

35

H [m]

Q [m3/h]

80-400

80-160

40-160

32-160

100-200

80-20065-200

50-200

40-200

150-250

150-280125-250

100-250

80-250

65-250

50-250

40-250

32-25040-315

50-315

65-315

80-315

125-315

200-315

250-400

200-355

150-315150-400

100-400

50-400

10 100 1000

0

50

100

150

200

250

Q [USgpm]H [f

t]

1 10 100 10000

10

20

30

40

50

60

70

80

H [m]

Q [m3/h]

ROWA-MC 1,500 rpm

ROWA-MC 1,200 rpm

ROWA-MC 1,800 rpm

ROWA-MC SeriesPerformance Data 60 Hz

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80-400

80-160

40-160

32-160

100-200

80-20065-200

50-200

40-200

150-250

150-280125-250

100-250

80-250

65-250

50-250

40-250

32-25040-315

50-315

65-315

80-315

125-315

200-315

250-400

200-355

150-315150-400

100-400

50-400

10 100 1000

0

50

100

150

200

250

300

350

Q [USgpm]H [f

t]

1 10 100 10000

10

20

30

40

50

60

70

80

90

100

110

H [m]

Q [m3/h]

80-400

125-315

80-20065-200

50-200

40-20040-160

100-200

80-160

32-160

150-280150-250

125-250

100-250

80-250

65-250

50-250

40-250

32-250

200-315

150-315

80-31565-315

50-315

40-315

300-500

250-400

200-355

150-400

100-400

50-400

10 100 1000

0

20

40

60

80

100

120

140

160

H [ft]

Q [USgpm]

1 10 100 10000

5

10

15

20

25

30

35

40

45

50

H [m]

Q [m3/h]

Why use Lawrence Pumps for Parts, Repairs, and Field Service?

As maintenance staffs and facilities are downsized, outsourcing to Lawrence Pumps, Inc. is a cost-effective solution for pump service and maintenance issues.• Materials and workmanship warranty• Parts and repairs to original equipment manufacturer specifications (including tolerances, manufacturing processes, and materials)• Root cause analysis• Hydraulic performance modifications• On-time delivery• Fully qualified personnel for welding and NDT• Access to a global installation base with experience and feedback on similar pumping applications, resulting in proposals with the latest upgrades.

Parts• All parts are manufactured to OEM specifications.• Complete rotating assemblies can be provided to minimize downtime.• LPI manufactures custom engineered pumps, and therefore will stock parts as

needed to satisfy customer requirements.

Repairs• Pump rebuilds (overhauls)• Part repairs• Upgrades to design or materials

• All repairs can be performed at LPI or any authorized Service Center.

Field Service• Installation• Start-up / Operation• Troubleshooting• Pump overhaul support• Training

• Contract maintenance• Preventive maintenance• Corrective maintenance• Condition monitoring

Technical Service and Support

LPI provides technical assistance and responds to technical inquiries regarding pump installation, start-up, operation, troubleshooting, spare parts, rebuilds, upgrades. The goal at Lawrence Pumps, Inc. is to enhance the reliability of pump operation, reduce MTBR and MTBF, and minimize the total life-cycle cost of ownership. LPI provides a package of services to meet these goals and maximize running time. Installation,

operation, and maintenance manuals are supplied with every pump shipment.

Manufacturer’sRepresentativesand Service Centers Worldwide

Global Headquarters:371 Market St.Lawrence, MA 01843

Phone: 978-682-5248Fax: 978-975-4291

www.lawrencepumps.com