Pump it up

01 March 2001 00:00  [Source: APC]

With a number of new plants expected onstream this year and next across Asia, the demand for pumps is expected to rebound. Here, APC reviews some new products recently launched onto the market

Possibly the most critical problem in intensive high shear batch mixing is ensuring that all parts of the batch have been uniformly processed. The probability of all the material passing through the 'high stress' zone within a reasonable amount of time is normally very low. This can often result in uneven or inconsistent processing or lengthy batch times to compensate for this.

The new Integrimix BF system from Maelstrom APT overcomes these problems using its patented Integral Pump Mixing (IPM) technology to ensure that every part of its integrated vessel is mixed.With its unique mixing head scraping the vessel walls and translating vertically through the entire batch volume, the Integrimix BF is designed to interact with 100% of the batch.This ability, combined with the exceptionally intensive mixing performance of IPM technology, enables the Integrimix BF to deliver extremely fine dispersions, emulsions and suspensions, even in materials which are normally difficult to mix.Standard Integrimix BF machines are available for batch sizes from 1L to over 100L and are capable of handling viscosities up to 100 000 cP.

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Meanwhile, based on the aforementioned unique and patented IPM principle, the new Integrimix C range of continuous mixers delivers exceptionally high stress mixing performance at flow rates between 0.25 and 100 tonne/hour. With fluid stresses at least one order of magnitude greater than a regular rotor-stator mixer, the Integrimix C is perfect for applications such as dispersion, emulsification, suspension, homogenisation and reactive mixing across a wide range of process industries.

KSB

German equipment manufacturer KSB has launched a novel canned motor pump offering zero-leakage operation and designed for chemical and process engineering applications. Owing to a combination of time-tested standardised chemical pump hydraulics and canned motor, new Secochem unites the benefits of simple handling with those of high operating reliability, says KSB.

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The very quiet, liquid-cooled motor has a corrosion-resistant can made of Hastelloy, a non-magnetisable material that minimises eddy current losses and promotes high efficiency. The motor winding is sized for operation with a frequency inverter. Together with a trip device in the control cabinet, the PTC thermistors in the motor winding ensure that the maximum permissible winding temperature is never exceeded. Thanks to sophisticated medium circulation - irrespective of the pump's installation position - the self-venting motor enables the pump to start without an elaborate venting process.

Generously sized, medium-lubricated ceramic bearings provide for long service lives and inspection intervals. The pump casing and rotor space are available with a heating option to prevent jamming caused by media that turn viscous or solid upon cooling, such as when the pump has not been running for a while.

The geometric proportions of this new pump generation allow upgrading of a conventional KSB standardised chemical pump with mechanical seal to a leak-free canned motor variant. Existing pump components can be used.

Flotronic

Process specialist, Flotronic Pumps (FPL), has extended the versatility of its highly successful 710 Series of stainless steel pumps with the introduction of an innovative new range of cost effective, self-draining pumps.

The new 710 Slimline Super Model pump is purpose-designed to meet strict hygienic requirements in food and pharmaceutical processing and for particularly demanding applications involving paints, solvents and products containing abrasive particles.

FPL has engineered these new self-draining pumps to ensure that, when the pump is idle, any media is automatically drained from the pump chambers. By eliminating media residue, the Slimline pump eliminates the risk of bacterial or other contamination in hygienic applications, and also minimises the threat of damage to the pump through permeation of corrosive material.

Like all pumps in the FPL 710 Series, the Slimline Super Model is an air driven, double diaphragm pump based upon Flotronics' patented 'One Nut' design for rapid, easy maintenance. In sharp contrast to conventional double diaphragm pumps where changing and replacing a failed diaphragm takes at least two to three hours, FPL's unique design allows engineers to complete the same job in less than ten minutes, simply by removing a single nut. For added convenience, this changeover can be performed whilst the pump is still connected to the pipework, keeping production downtime to an absolute minimum.

Manufactured in 316 Stainless Steel on all wetted metal parts, the 710 Series is a compact, versatile range proven in numerous process applications worldwide. All pumps in the series offer high dry suction lift and the capacity to handle 100L of liquid per minute.

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Due to its durability and resistance to corrosion, the 710 Series is ideal for use in processing acids, adhesives, cosmetics, petrochemicals, solvents and solids in suspension. As the pump can be easily stripped and cleaned to meet maximum hygiene standards, it is also suitable for processing dairy products and foodstuffs.

FPL supplies a wide range of elastomers to suit a large selection of specialist media requirements, including high temperature, PTFE faced rubber diaphragms. These are particularly suited to handling hot CIP regimes. Pumps are also available with jackets, for use with steam or hot water, as well as rupture protection barriers (for diaphragms), alarms and pulsation dampers.

Sensidyne

Sensidyne of the US has introduced its new Gilian 3.5L/minute air sampling pump with improved reliability and simplicity in order to reduce maintenance time and cost.

Automatic constant flow - the most important feature of any sampling pump - is standard on most Gilian Pump models. It ensures pulsation-free flow is maintained within +/- 5% of the initial set point, even with varying back pressures from flow restrictions or build up of material on the filter.

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These modules can be quickly added to most high flow Gilair pumps to adapt them to the lower flow rates required for sorbent tube sampling. Also available is a multiflow low flow module, which maintains constant pressure and allows sampling with multiple sorbent tubes, each with an independently set flow rate.

BOC

BOC Edwards has upgraded its popular range of mechanical booster vacuum pumps for chemical applications. The EH1200C, EH2600C and EH4200C are now fitted with a high powered flameproof motor as standard, ensuring reliability in arduous duty gas evacuation applications.

Featuring BOC Edwards' unique hydrokinetic drive technology, EH booster pumps are designed for continuous running at all pressures. This means that both booster and backing pumps can be started at the same time from atmospheric pressure, for faster pump-down and simpler, more reliable operation. Evacuation times can be as little as half those required by traditional pumping solutions.

In addition, the hydrokinetic drive design means that EH series pumps require no pressure sensors, by-pass lines, valves or complex control systems, so installation is simpler and less costly. Since there is no need for a pressure release or bypass valve either, the integrity of the pump is not compromised by ingress of dust or water vapour.

The upgraded EH1200C, EH2600C and EH4200C pumps must be used with a suitable vacuum backing pump for continuous evacuation of gas from atmosphere, at pumping speeds of 1000 to 3100m3/h. They can be supplied stand-alone to incorporate into a vacuum system, or backed with a BOC Edwards dry chemical vacuum pump, such as the DP Drystar, for an all-dry pumping solution down to an ultimate vacuum of 10-3mbar.

All the chemical EH series pumps are fitted with flameproof motors as standard. Those designed for operation at 50Hz have motors approved to Eexd, gas group 11A, 11B and temperature Class T4 ratings. Pumps designed for operation at 60Hz have motors approved to CSA Div 1 area, Gas class 1 Group C and D, dust class 11 Group F and G, and temperature Class T3C.

Sterling Fluid Systems

A new compact, dry-running vacuum pump, which offers all the advantages of dry running pumps over conventional vacuum technologies and is suitable for a wide variety of applications such as drying, degassing, distillation, inerting, crystallisation, and vessel charging, particularly in locations where space is limited, has been added to the SIHIdry range of vertical dual-screw pumps form Sterling Fluid Systems.

Designed for the efficient pumping of a wide range of gases and vapours, the new SIHIdry 250 features the sophisticated screw design, integrated synchronised motors and drive electronics that are characteristic of the SIHIdry range, and offers users the same performance benefits such as no mechanical seals, greater reliability and flexibility, low operating costs and environmentally friendly operation.

Capable of handling wide variations in flow, temperature and the liquid content of the pumped medium, the SIHIdry 250 also has an unusually compact design which makes it easy to install and allows it to fit into existing applications, even where space is limited.

The SIHIdry 250's electronic drive control is integral with the pump unit while the local control panel allows installation flexibility with minimal relocation costs - the unit can also be remotely controlled via the process control system. These integrated automatic control functions make operation much simpler than conventional vacuum system.

Other advantages of the SIHIdry range include easy, low frequency maintenance, built-in diagnostics and infinitely variable operation to match the process.

Additionally, the pumps will handle up to 100% liquid 'carry over', and give totally leak-free operation without lubricating or operating fluids.

In common with the existing SIHIdry range, the new 250 model complies with the 'ATEX 100' European directive, which covers equipment to be used in potentially explosive atmospheres, such as those found in the chemical and pharmaceutical sectors. The legislation, which will be mandatory from July 1 2003, requires that the complete pump and drive unit meet stringent electrical, mechanical and instrumentational safety standards before the CE marking and appropriate explosive protection classification can be awarded.

Most dry-running vacuum pumps currently available do not comply with this directive since, with these, the temperatures reached by the evacuated media during the compression stage considerably exceed the temperature limits set by the ignition temperature classification.

The SIHIdry 250 operates at less than 75 dB(A) noise level and has a nominal suction capacity of up to 250m.

Welch

Welch of the US has developed a range of four standard duty, dry vacuum pumps suited to a variety of aqueous aspiration and drying applications in industrial and analytical processes across industries such as electronics manufacture, materials processing, and other process sectors. Built around the economical Wob-L piston designs, the pumps combine high performance levels with compact size, and provide maintenance-free operation.

Smaller and lighter than oil-sealed rotary designs, the new pumps offer the additional advantages of dry operation and higher pumping throughput. The pumps provide ultimate pressures from 10mbar to 80mbar, and free flows up to 201 L/minute. The designs also provide a more effective package than diaphragm pumps, says the firm, with the smallest pump in the range typically half the size of a diaphragm pump that would be required to do the same job.

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Designed for drying aqueous solutions and aspirating sticky or viscous substances, the range of pumps has two models, each in two sizes.

Each pump is fitted with a vacuum gauge to monitor vacuum level and an inlet trap to prevent the accidental ingestion of liquids or particles. A variable oriface located on the inlet trap allows the user to set the maximum vacuum level obtainable.

Goulds Pumps

Goulds Pumps, one of the fluid businesses of ITT Industries, has introduced a new line of ISO magnetic drive process pumps. The pump was developed using the combined expertise of ITT Richter Chemie-Technik (Germany), Vogel Pumpen (Austria), and Goulds Pumps (USA) research and development engineers to create the optimum sealless pump. Numerous applications for the product exist in process fluid services throughout the chemical, paper, and general industries.

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The ICM has been designed for flows up to 1760 GPM (400 m3/h) and heads to 685ft (210 m) at 3500 rpm. Standard operating pressures are up to 232 psig (16 bar) with options for 362 psig (25 bar). Operating temperatures range from -40û to 550ûF (-40û to180°C), optionally to 536ûF (280°C).

The ICM is specifically designed to pump difficult fluids such as corrosives, ultra-pure, and toxics liquids. Its sealless, sturdy design combines with a wide variety of wetend materials (stainless steel, Hastelloy, ductile iron, alloy 20 and titanium) to provide a reliable pump which maximises service life.

The ICM series completes the range of Goulds process pumps. Plant operators can now choose magnetic driven and mechanically sealed pumps of metal or plastic lined design, both to ISO and to ASME/ANSI standards.

Modern technologies like the FEM Finite Element Method and CFD Computational Fluid Dynamics have been used to develop the ICM.

The bearings are chemical and abrasion resistant Silicon Carbide (SSiC). The proven SAFEGLIDE PLUS dry run protection can be provided. In the case of bearing failure, the wetted rotor cannot come in contact with the separating can, nor will larger SSiC parts get out of the cartridge. That means that the separating can - being the most important sealing towards the atmosphere - remains on the safe side.

There are no welding joints exposed to the pumpage: the can is homogenous material, the wetted surface is smooth and resistant to corrosion. A moulded-in bead prevents medium vortexing in the rear can, which in case of solid contents could erode the can.

Other features include:

• Integrated connection provisions for a variety of pump monitoring
• Optional Hydrovar and PumpSmart flow control equipment
• Inducer technology to overcome insufficient NPSHa conditions
• External plain bearing flushing for liquids containing solids or crystallising media
• Pump is designed for easiest maintenance: few subassemblies, no need of special tools, no need of alignments The company has also introduced the Model HT3196 ANSI pump high temperature process pump.
  
  

Centerline-mounted in a heavy duty fabricated steel casing support, the Model HT3196 minimises shaft misalignment and piping strain associated with high temperatures up to 700°F. Available in 28 sizes, offered in 316ss, CD4Mcu, Alloy-20, and Hastelloy-C liquid end construction, this eighth member of the ANSI pump family features Goulds' premier X-series power end, multiple seal chamber options including the Taper Bore Plus, and a wide variety of rigid and rugged mounting systems.

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