Excellence In Engineering, Manufacturing and Marketing Mechanical Sealing Device
Our services and our extensive product line can help our customer lower their sealing cost compared to any leading seal manufacturers.
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Aggressive, sometimes toxic media, high pressures as well as extreme temperatures and temperature fluctuations – seals face special challenges in the extraction of chemicals and their processing into high-value finished products. Specifications for purity and hygiene, the required approvals and stringent statutory emissions limits tighten the requirements profile even more. For this Challenge we have continually provided quality solutions for our customers.
For application like DOWNTHERM/SERVOTHERM where temperature is around 320⁰C, we offer Metal bellow seals with CARBON/SIC Face combination with Graphite Packings. For critical application like Coal Tar and Ammonia, we offer Double Cartridge Seal with Kalrez Packing wherein the life of seal goes up by 10-12 months. For application like Hydrochloric Acid + Ferric chloride in cold rolling mills, we offer Teflon Bellow Cartridge seal where in the springs are not exposed to atmosphere with SIC/SIC faces.
Food Industries is another challenge for its diversity in varied areas. In the dairy industry, high fat content of the product media must be taken into consideration for selection of materials. An EPDM material which has a very good resistance to CIP/SIP media, for example, has only limited resistance to fatty media. Cleaning with alkaline solution is also carried out very intensively, i.e. at high concentrations and temperatures, in order to eliminate the fat and protein residues from the pipes. Steam sterilization methods are also to some extent used much more intensively in dairies than for instance in breweries. The seals must be designed accordingly for this. The raw materials used for such industries is always FOOD Grade.
Beer Hygiene and cleanliness of the production facilities as well as a variety of other challenging factors require a good sealing technology in the production of beer. In addition to the sometimes aggressive cleaning processes, the sealing materials must withstand salt deposits (beer scale) and tolerate a high CO2 content. The preferred cleaning method uses acid at a concentration of up to 3% at +80 °C (+176 °F) in order to remove the salt deposits from the pipe system. During production and cleaning (steam sterilization), high temperatures prevail, which present a major thermal load for seals. Ultimately, the wort also promotes a high degree of wear of the seals. For this reason, the sealing material for this application should be carefully selected.
A typical application in the petrochemical industry is so-called steam cracking. In addition to being resistant to aggressive chemicals, seals must withstand high temperatures and pressures. In a convection-capable furnace for heating the bottom product, for example, there are temperatures of up to +600 °C (+1,112 °F) with simultaneous pressure and vaporization. During the subsequent cracking of the resulting gas, the temperatures increase further to +850 °C (+1,562 °F). The real challenge for seals is, however, in the intense temperature changes that occur during the subsequent cooling of the gas. The seal must also withstand the pressure increase during the compression of the cracked gas to about 30 bar. The absorption of gases requires the use of chemicals, in particular caustic solution. The API 682 Standard for making seals for petroleum industry is a good example.
In the pharmaceutical industry, the basic and reactive chemicals need to be extra pure so that no unwanted by-products are generated in the synthesis. In general, production is done in batches in order to ensure traceability from the raw material supplier to the patient in the event of quality problems. Seals are not to be underestimated part in this process because they partly have direct contact with the media. And with the appropriate sealing technology, the risk of contamination and thus of costly and time-consuming retracing can be reduced. A particular challenge for this industry lies in the versatility of its processes where many different demands are made on the components.
Single Mechanical seal design with full array of interchangeable seal rings and hardware to increase flexibility and spare part inventory requirements. Vessels and Agitators seals are dry running Carbon Graphite ring design promotes extremely long runs and low maintenance requirements. Universal Cartridge seals, Elastomer bellow seals, Single coil spring seals with CARBON/SIC face is widely used in Pharma industries.
The different challenges within oil and gas applications require elastomeric seals with very different attributes. The single most important aspect in ensuring system integrity is choosing the correct type of seals for the specific application. The variety of applications across the oil and gas industry requires customized sealing materials that can maintain their performance under the precise demands of a given operating environment.
Depending on the application, the seals may need to withstand a range of chemical species corrosion inhibitors, high temperature steam, or low temperatures in conjunction with high pressures. However, no single type of elastomer is suitable across all possible applications even within the same industry.
Elastomeric seals may absorb gas during operation without damaging the seal but the condition known as Rapid Gas Decompression (RGD) or Explosive Decompression (ED) can occur when the system pressure is suddenly relieved and the absorbed gas expands rapidly destroying the seal. Proper material selection is key to obtaining optimal seal performance in equipment operating in high pressure gases.
Oil and gas industries have API 682 complaint sealing solutions. Single and double Cartridge seals are used in API 610 Pumps. Metal Bellow seals are designed for high temperature seals up to 425⁰ C. Dry Gas seals are used for pipeline gas compression, offshore platforms and refineries. API plan 52 and 53 A seal support systems are used for unpressurised and pressurised dual seals.
A pulp is obtained by converting converts wood chips or other plant fibre source into a thick fibreboard which can be shipped to a paper mill for further processing. Pulp can be manufactured using mechanical, semi-chemical or fully chemical methods (kraft and sulphite processes). The finished product may be either bleached or non-bleached, depending on the customer requirements.
Wood and other plant materials used to make pulp contain three main components (apart from water): cellulose fibres (desired for papermaking), lignin (a three-dimensional polymer that binds the cellulose fibres together) and hemicelluloses, (shorter branched carbohydrate polymers). The aim of pulping is to break down the bulk structure of the fibre source, be it chips, stems or other plant parts, into the constituent fibres.
Chemical pulping achieves this by degrading the lignin and hemicellulose into small, water-soluble molecules which can be washed away from the cellulose fibres without depolymerizing the cellulose fibres (chemically depolymerizing the cellulose weakens the fibres). The various mechanical pulping methods, such as groundwood (GW) and refiner mechanical (RMP) pulping, physically tear the cellulose fibres one from another. Much of the lignin remains adhering to the fibres. Strength is impaired because the fibres may be cut. There are a number of related hybrid pulping methods that use a combination of chemical and thermal treatment to begin an abbreviated chemical pulping process, followed immediately by a mechanical treatment to separate the fibres. These hybrid methods include thermomechanical pulping, also known as TMP and chemi thermomechanical pulping, also known as CTMP. The chemical and thermal treatments reduce the amount of energy subsequently required by the mechanical treatment, and also reduce the amount of strength loss suffered by the fibres.
Various machines are used in the process of pulp production. Pressure Grinders, refiners, agitators, pumps, screw conveyors and sorters demands for a high quality sealing solutions. Excellent seal effectiveness prevents leaks and the resulting machine breakdowns – reliably and lastingly. Costly downtime is eliminated. Reduction of energy and water usage is another challenge in such industries to reduce their operating cost.
Inside mounted and Outside mounted Mechanical seals with CARBON/SIC Face with Viton/Buna N secondary packings.
Today’s power generation plants need high parameter Mechanical seals for boiler feed and boiler circulating pumps. The lime slurries needed for cleaning exhaust gases in the flue gas desulfurization systems of coal power stations require rugged pumps with special sealing arrangements.
Mechanical seals used in pumps connected to large boilers in the lime processing plant face particular difficulties. These mechanical seals have to include a so-called shut-down seal in order to prevent pump failure and plant downtime.
We offer pusher type Single/Double cartridge seals for boiler feed circuit application. They are designed for critical high pressure, high temperature and high shaft speed applications.
Nishant seals is involved in all different stages of iron & steel making process. Specifically in material handling plant, blast furnace, coke oven, continuous casting, hot & cold rolling mill.
STEEL MAKING PROCESS
Nishant seals has been providing sealing solutions from iron ore processing till finished coils.
In Blast Furnace, where the seals are exposed to high temperature, we provide sealing solution for critical equipment’s like Tap Hole Drilling used for tapping the furnace, Mudgun ramming cylinder.
COKE OVEN PLANT
For continuous casting process, we provide seals which giving optimum life to reduce the downtime & production loss.
HOT & COLD ROLLING MILL
In hot & cold rolling process, we provide heavy duty seals.
For optimum economy and ecology it is all the more important, therefore to have a reliable sealing systems. In the past it was normal for juice pumps to be equipped with double seals to cope with the tendency to crystallization and carbonation. Today the use of single seals is possible in most of the cases due to availability of modern materials and new seal compartment geometries.
For different operating conditions, we can offer Single balanced encapsulated spring with flushing for Raw juice with sand. Double unbalanced seals with encapsulated spring for Thick juices.
We have created OEM Mechanical seal range to support the market demands for maintenance and repair of OEM Pumps and Rotary equipments. We have array of seals for Allweiler, Fristam, APV, Grundfos, ALFA Laval, HMT, Waukesha, KSB, Kirloskar, Johnson, Mather & Platt, Flowserve, Sulzer and Microfinish Pumps.