Materials Handling
HOmatic
Using inert gas in the storage tank (nitrogen), fitting a silica gel filter on top of the tank or having ultra dry air as an ‘inert gas’, prevents the isocyanate from forming hard crystals. Systems pumping isocyanate should be provided with a filter
or a strainer to avoid crystals, if any, to circulate in the system constantly. All isocyanates are hazardous and the vapour should not be inhaled. Contact with the skin leads to discoloration and prolonged contact may result in allergic reactions. Rotan always recommend the use of magnetically-coupled pumps for isocyanate. Bearings in tungsten carbide is the preferred bearing
material. Rotan ED pumps are recognised by leading international and domestic manufacturers such as Bayer, BASF and Huntsman. The ED pumps effectively reduce the life cycle costs and downtime in the factories. ED pumps hold a major future in the petrochemical,
paint and coating business as well as the liquid pitch and tar industry, and magnetically driven Rotan pumps are often a very economic solution compared to traditionally sealed pumps.
n Liquid sulphur. Although molten sulphur is commonly delivered using packed style pumps, the product that seeps through the packing creates significant problems. Several years ago a Rotan magnetically driven pump was offered where zero leakage was required in the soap industry. For the first time a Rotan ED series pump was offered.
Sulphur temperature must be controlled within a 120°-155°C temperature range. Outside this temperature range sulphur solidifies. Rotan model MD33EFDK-1U33 jacketed pump including carbon graphite bushings and high temperature magnets proved successful. Following our initial success the process engineer agreed to
serve as a reference where Rotan pumps were being considered in a more aggressive service where sulphur is delivered to a burner in the production of mercaptan. Mercaptan is used as an odorant within natural gas and used in the production of plastics. The initial success in the soap industry lead to a nice order
within Arkema Corporation and included five Rotan model MD51EFDK-3U88 units complete with gear reduction. In this case stainless steel construction was required where contaminates caused corrosion to cast iron materials. Due to higher continuous duty operating pressures, tungsten carbide bearings and thrust washers were selected. Following several years of success, a sister plant followed with another significant order in 2009. Molten Sulphur is burned to produce S02
in a process that
conditions flue gas in coal burning power plants. A Rotan model MD101EFDK-1U33 is used as a transfer pump and another order followed in the same service.
Conclusion
Rotan magnetic driven pumps are proven in molten sulphur
service where typical flows range from 2-150gpm. Care should be taken since some sulphur products are corrosive and some include abrasive contaminants. In these cases stainless steel materials and tungsten carbide should be considered. n
Enter 29 or ✔ at www.engineerlive.com/epe
Dan Roldgaard is with DESMI A/S, Nørresundby, Denmark. www.desmi.com
pinch valves:
Ideal closing and measuring of bulk goods, liquids and gases
HOmatic
pinch valves:
Innovation and quality that will pay off
VALVE ENGINEERING
info@ho-matic.ch
www.ho-matic.ch
Circle 29A or ✔ at www.engineerlive.com/epe
Q.S.V. EP patent
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