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Diverter valves for pneumatic conveyor systems
Corroded cannon and modern weaponry cleaned and preserved Effective loosening of many centuries of various accumulated contaminants on arms and weaponry can quickly be achieved without damage by using cleaning and protective products developed by LPS Research Laboratories. The Company's products have been widely used for some time, both for working guns and historic pieces of ordnance. Recent developments with ancient naval cannon have resulted in preservation techniques with considerable promise for future conservation work in halting corrosion.
has been a light spray with the lubricant approximately once a month.
Particular functions such as the daily cIeaning and care of firearms can be performed by LPS1, a water repellent, penetrant and light duty lubricant/ protectant. It will loosen deposits of both modern and ancient explosives, as well as accumulated 'handling dirt', allowing a quick wipe or brush-up to clean the weapon. With several city police forces in the USA, the mandatory cleaning procedure for weapons after firing is immersion in LPS1, often in an ultrasonic bath to speed and simplify the process.
The technology, whereby the physica! properties of specially prepared fluids are changed by the application of an electric field, is the subject of increasing research, tt enables motion output elements such as hydraulic rams to interface directly with solid-state electronics.
A particular application of LPS1, w~Ach promises exciting rewards for archaeology and conservation, has been pioneered at the Chatham Historic Dockyard Trust. Here the recovery of discarded and corroded cast iron cannon from burial or immersion has been successfully undertaken by the ordnance curator, Captain Caruana. The only previous remedy against the corrosion which follows re-exposure to the atmosphere has been to apply thick coats of black bituminous paint. However, the paint iayers cover all surface detail and, in reaiity, merely slow the rate of corrosioni Captain Caruana has shown that by applying the lubricant with brush or spray, internally and externally, the corrosion process can successfu!ly be halted. Treated in this way, the cannon can be cleaned to bright metal with all details revealed. One example has now been maintained in this state for a year, housed without a protective coating at Chatham's indoor cannon display. The only subsequent treatment
274
LPS Research Laboratories Ltd, Lloyds House, Alderley Road, Wilmslow, Cheshke SK9 1QT, UK
Turning fluids into solids with electricity A speciatised test rig and power supply, for use as control elements for research into electro-rheoiogicaI (ER) fluids, has been developed by Laser Engineering.
Fields of application currently being studied include valve, clutch and damper mechanisms, where the ability to programme and provide high-speed control of such devices simply by varying an applied voltage is especially promising. The company is one of a number forming the Electro-Rheotogicat
Research Syndicate Ltd, who fund research into tkListechnology to support commercial appJAcations of" interest to members. To assist in this work, especiaIly in the study of different ER fluids and their characteristics, the company have developed a standard form of test r~g with a specialised power supply to operate it. Laser Engineering (Developmenu Ltd, 7 11 Curtain Road, London EC2A 3LU. UK
Diverter valves for pneumatic conveyor systems De Machine£abriek Noordwykerhout B.V. has developed a range of diverter valves for pneumatic conveying systems for powdered and granular products, The divert er valves complement the broad assortment of rotary airlocks and blowing seals which the company already markets for the bu!k industry_ The diverter vanes are supplied in three types, with pneuraatic operation (CAD-P), with electric operation (CAD-E) and with manual operation (CAD-N). Each type is available in twc sizes, one with a flange connection of 65 mm and the other with a flange connection of 100 ram.
Eleetro-Rheolo~ieal test rig from Laser Engineenng
October 86 Vo! 19 No 5
The valves have a housing and flap made of cast and then hard-anodized aluminium. The low weight material of the piping is subject to less severe loading. Installation is simplified because hoisting equipment is not needed. The flap is fitted with a seal edge of high-grade polyurethane rubber, and rotates in PTFE plain bearings. The shaft extensions are sealed with a combination of profiled plastic washers. The maximum pressure difference relative to the atmosphere is 2 bar and the maximum pressure difference over the flap is 0.5 bar. The design chosen allows the flap to be switched during installation but with the product flow switched off. The absence of dead spots prevents any of the product from remaining in the valve housing. The maximum operating temperature of the DMNWestinghouse diverter valves is 80°C. The company's range of diverter valves, rotary airlocks and blowing seals are employed in pneumatic conveying systems in the food and drink manufacturing industry, the chemical and pharmaceutical industries, the plastics industry and the cattle feed industry. De Machinefabriek Noordwykerhour B.V., PO Box 6, 2210 AA Noordwijkerhour, The Netherlands
Bunker lining improves coal flow at power station The flow of bulk solids such as coal, gypsum and ore has always created difficulties for handling engineers. Rat-hohng, bridging and freezing in hopper bottoms can cut the flow rate considerably or even stop it altogether. Rodding out is dangerous, timeconsuming and damaging to hopper walls, therefore the solids handling industry has looked at many alternatives to assist material flow. One method is to use high build low friction coatings such as Utimax BS developed by BP Chemicals subsidiary, Mebon Paints. Advantages claimed are good slip characteristics, excellent abrasion resistance, and beneficial ice release properties and ease of application to concrete or steel. An example of the benefits gained is the boiler feed bunker at Castle Donington Power Station. Coal flow in the six boiler feed concrete coal bunkers caused the power station many problems. Bridging and rat-holing decreased flow to a virtual standstill and the coal and ash engineers had to look at methods of improving the flow rate. After consideration it was decided to conduct a trial using this particular
bunker lining which is a high solids 'stick-resistant' modified polymer coating with a very low coefficient of friction. For the first trial the walls of one bunker were cleaned and the coating was brush applied to the recommended film thickness. The hopper mouths on the bunker were already protected by glass tiles and these were left in position. The results of the trial were very encouraging, alleviating nearly all of the restricted flow problems which had been experienced. Since this trial, some five years ago, all six 1,000 tonne capacity boiler feed coal bunkers have been protected with the lining and where necessary the glass tiles are being removed and replaced by the coating. The system is now applied using standard airless spray equipment. Regular inspection shows that the lining stands up well to the abrasive wear of the coal. At the three year shutdown, fihn thickness can be topped up by an additional coat as necessary to ensure long life performance. Castle Donington is a two shift Power Station which means the coal flow is stopped overnight, except for emergency power requirements, and this really puts the coatings to the test when flow is re-introduced each morning. The 600MW station has an average coal throughput of 4,000 tonnes/day. The lining, a specially reinforced polymer formulation, is available as an alternative to using glass tiles, polyethylene sheets or stainless steel cladding to assist in the promotion of material flow even in adverse conditions. Application of the coating, which is normally between 1 and 3ram thick when dry, can be carried out using brushes or airless spray equipment and areas of severe wear can be built up with extra coats. The lining is therefore completely joint free, and~ it is claimed, quicker to apply than any of the alternative methods.
DMN Westinghouse Diverter valve for pneumatic convevor systems for powdered and granular products
T R I BO LOGY international
Mebon Paints Limited, Blackwell Road, Huthwaite, Sutton in Ashfield, Nottingham NG17 2RE, UK
275
has been a light spray with the lubricant approximately once a month.
Particular functions such as the daily cIeaning and care of firearms can be performed by LPS1, a water repellent, penetrant and light duty lubricant/ protectant. It will loosen deposits of both modern and ancient explosives, as well as accumulated 'handling dirt', allowing a quick wipe or brush-up to clean the weapon. With several city police forces in the USA, the mandatory cleaning procedure for weapons after firing is immersion in LPS1, often in an ultrasonic bath to speed and simplify the process.
The technology, whereby the physica! properties of specially prepared fluids are changed by the application of an electric field, is the subject of increasing research, tt enables motion output elements such as hydraulic rams to interface directly with solid-state electronics.
A particular application of LPS1, w~Ach promises exciting rewards for archaeology and conservation, has been pioneered at the Chatham Historic Dockyard Trust. Here the recovery of discarded and corroded cast iron cannon from burial or immersion has been successfully undertaken by the ordnance curator, Captain Caruana. The only previous remedy against the corrosion which follows re-exposure to the atmosphere has been to apply thick coats of black bituminous paint. However, the paint iayers cover all surface detail and, in reaiity, merely slow the rate of corrosioni Captain Caruana has shown that by applying the lubricant with brush or spray, internally and externally, the corrosion process can successfu!ly be halted. Treated in this way, the cannon can be cleaned to bright metal with all details revealed. One example has now been maintained in this state for a year, housed without a protective coating at Chatham's indoor cannon display. The only subsequent treatment
274
LPS Research Laboratories Ltd, Lloyds House, Alderley Road, Wilmslow, Cheshke SK9 1QT, UK
Turning fluids into solids with electricity A speciatised test rig and power supply, for use as control elements for research into electro-rheoiogicaI (ER) fluids, has been developed by Laser Engineering.
Fields of application currently being studied include valve, clutch and damper mechanisms, where the ability to programme and provide high-speed control of such devices simply by varying an applied voltage is especially promising. The company is one of a number forming the Electro-Rheotogicat
Research Syndicate Ltd, who fund research into tkListechnology to support commercial appJAcations of" interest to members. To assist in this work, especiaIly in the study of different ER fluids and their characteristics, the company have developed a standard form of test r~g with a specialised power supply to operate it. Laser Engineering (Developmenu Ltd, 7 11 Curtain Road, London EC2A 3LU. UK
Diverter valves for pneumatic conveyor systems De Machine£abriek Noordwykerhout B.V. has developed a range of diverter valves for pneumatic conveying systems for powdered and granular products, The divert er valves complement the broad assortment of rotary airlocks and blowing seals which the company already markets for the bu!k industry_ The diverter vanes are supplied in three types, with pneuraatic operation (CAD-P), with electric operation (CAD-E) and with manual operation (CAD-N). Each type is available in twc sizes, one with a flange connection of 65 mm and the other with a flange connection of 100 ram.
Eleetro-Rheolo~ieal test rig from Laser Engineenng
October 86 Vo! 19 No 5
The valves have a housing and flap made of cast and then hard-anodized aluminium. The low weight material of the piping is subject to less severe loading. Installation is simplified because hoisting equipment is not needed. The flap is fitted with a seal edge of high-grade polyurethane rubber, and rotates in PTFE plain bearings. The shaft extensions are sealed with a combination of profiled plastic washers. The maximum pressure difference relative to the atmosphere is 2 bar and the maximum pressure difference over the flap is 0.5 bar. The design chosen allows the flap to be switched during installation but with the product flow switched off. The absence of dead spots prevents any of the product from remaining in the valve housing. The maximum operating temperature of the DMNWestinghouse diverter valves is 80°C. The company's range of diverter valves, rotary airlocks and blowing seals are employed in pneumatic conveying systems in the food and drink manufacturing industry, the chemical and pharmaceutical industries, the plastics industry and the cattle feed industry. De Machinefabriek Noordwykerhour B.V., PO Box 6, 2210 AA Noordwijkerhour, The Netherlands
Bunker lining improves coal flow at power station The flow of bulk solids such as coal, gypsum and ore has always created difficulties for handling engineers. Rat-hohng, bridging and freezing in hopper bottoms can cut the flow rate considerably or even stop it altogether. Rodding out is dangerous, timeconsuming and damaging to hopper walls, therefore the solids handling industry has looked at many alternatives to assist material flow. One method is to use high build low friction coatings such as Utimax BS developed by BP Chemicals subsidiary, Mebon Paints. Advantages claimed are good slip characteristics, excellent abrasion resistance, and beneficial ice release properties and ease of application to concrete or steel. An example of the benefits gained is the boiler feed bunker at Castle Donington Power Station. Coal flow in the six boiler feed concrete coal bunkers caused the power station many problems. Bridging and rat-holing decreased flow to a virtual standstill and the coal and ash engineers had to look at methods of improving the flow rate. After consideration it was decided to conduct a trial using this particular
bunker lining which is a high solids 'stick-resistant' modified polymer coating with a very low coefficient of friction. For the first trial the walls of one bunker were cleaned and the coating was brush applied to the recommended film thickness. The hopper mouths on the bunker were already protected by glass tiles and these were left in position. The results of the trial were very encouraging, alleviating nearly all of the restricted flow problems which had been experienced. Since this trial, some five years ago, all six 1,000 tonne capacity boiler feed coal bunkers have been protected with the lining and where necessary the glass tiles are being removed and replaced by the coating. The system is now applied using standard airless spray equipment. Regular inspection shows that the lining stands up well to the abrasive wear of the coal. At the three year shutdown, fihn thickness can be topped up by an additional coat as necessary to ensure long life performance. Castle Donington is a two shift Power Station which means the coal flow is stopped overnight, except for emergency power requirements, and this really puts the coatings to the test when flow is re-introduced each morning. The 600MW station has an average coal throughput of 4,000 tonnes/day. The lining, a specially reinforced polymer formulation, is available as an alternative to using glass tiles, polyethylene sheets or stainless steel cladding to assist in the promotion of material flow even in adverse conditions. Application of the coating, which is normally between 1 and 3ram thick when dry, can be carried out using brushes or airless spray equipment and areas of severe wear can be built up with extra coats. The lining is therefore completely joint free, and~ it is claimed, quicker to apply than any of the alternative methods.
DMN Westinghouse Diverter valve for pneumatic convevor systems for powdered and granular products
T R I BO LOGY international
Mebon Paints Limited, Blackwell Road, Huthwaite, Sutton in Ashfield, Nottingham NG17 2RE, UK
275