MechChem Africa March 2020

⎪ Pump systems, pipes, valves and seals ⎪

Matching pump to application ensures low total cost of ownership

Pumping fluids with high solids concentrations is more complicated than pumping water.To avoid sedimentation in the system, the correct pump size with appropriately dimensioned hoses and pipes must be selected.

A dding to the complexityof selecting pumps for slurry pumping applica- tions is the concentration of solids which, together with particle size and shape, can affect pump performance and power requirements. Settled solids might require external agitators, water jets or mix- ers to get them back in suspension and allow them to be pumped. All these factors need to be considered when selecting the correct slurry pump for an application, and local Grindex pump distribu- tor Integrated Pump Technology has issued a cautionagainstmaking this purchasedecision based on capital cost alone. “Slurry pumps need to handle abrasive solidsinsuspension,includingsand,graveland waste products in high concentration,” says ColinAdams, managingdirector of Integrated Pump Technology. “Copingwiththehighlevelsofwearcaused by this abrasion requires a pumpwithhydrau-

two configurable outputs that can be set to: switch, analogue or frequency.  A dosing function can also be selected. Significant characteristics • Monitoring,dosing(withexternalcontrol input) and transmitter function. • Coloured, multi-parameter configurable TFT-display, rotatable in 90° steps. • Bi-directional measuring. • Intuitive setup menu (four optical touch keys). • Two configurable outputs (pulse-/fre- quency-/alarm- and analogue output). • Grand and resettable totalizer. Areas of application • Water & waste water treatment. • Water distribution network (leakage detection management). • Water tapping and irrigation. • Filtration systems (e.g. reverse osmo- sis and ultrafiltration). • Industrial applications. MIS characteristics for; Electronics: • IO-Link • Function package C3T: Flow measure- lic partsmanufactured froma veryhardmetal alloy. Selecting anything lesswill result inhigh maintenance and repair costs, translating into unnecessarily high total cost of ownership.” Grindex Bravo submersible slurry pumps are engineered to cope with the toughest pumping conditions, and the hydraulic com- ponents are made from Hard Iron™, one of the hardest materials available. “Countering excessive wear is important in slurry pumps. The robust construction of the Bravo pump, coupledwith its lowshaft speed, ensures high wear resistance even in the most demanding slurry applications,” Adams says. The Bravo pump range can operate over the complete pump curve, not just on a specific duty, and can handle from 30 litres to 130 litres per second at a maximum head of 45 metres. The large through-let means the pump can handle solids of varying sizes. With its single adjustment screw it is simple to tweak the pump impeller for optimal per-

Grindex Bravo pump is proving its worth in slurry pumping applications. formance.Thepumpsarealsoequippedwitha leakage sensor that facilitates earlydetection of any problems, allowing action to be taken as soon as possible. Pumps in the Bravo range – from the 400 upwards – are equipped with an agitator de- signedspecificallyforcoarserslurries.Thisen- ablesthepumptostirupandpumpsand,sludge and solids in suspension. “Our team of experi- encedand skilledpumps specialists canadvise customersonthemostappropriatepumpfora particular slurryapplication, ensuring that the pump installationwill operateat lowtotal cost of ownership,” Adams concludes. q

Easy set-up with the bi-directional inductive flowmeter Instrumentation and process control com- pany, INSTROTECH, now offers Kobold’s MIS magnetic inductive flowmeter. The flow meter, or magmeter, was developed specifically for measuring and monitoring medium-sized flow of conductive liquids in pipes.

ment, counting, dosing, alarm, Hotkeys, rotatable display Electrode material: • HastelloyÒ C276, titanium, platinum, tantalum, stainless steel Linings: • NBR, EPDM, soft rubber, PTFE

It is operated by electromagnetic mea- surement, where a voltage is induced in a conductormoving through amagnetic field. Theelectrically conductivemeasuringagent acts as themoved conductor. The voltage in- ducedinthemeasuringagentisproportional to theflowvelocityand is thus avalue for the volumetric flow. The induced voltage is picked up by two sensing electrodes in contact with themea- suring agent and is sent to the measuring amplifier, which amplifies themeasurement that cannot be measured directly. The flow rate is calculatedon the cross-sectional area of the pipe. The magnetic inductive measurement with the MIS does not depend on the pro- cess liquid or itsmaterial properties such as density, viscosity and temperature. It offers

MIS magnetic inductive flowmeter from Kobold.

March 2020 • MechChem Africa ¦ 9