NuMAC Nagpur, Maharashtra

Quality of coal plays an important role in all its utilization activities. Depending on the ultimate objective, be it steel making or power generation, the feed coal must satisfy some desired quality parameters. Coal being a highly heterogeneous substance in terms of inorganic and organic constituents, exhibits wide variability with respect to size and chemical compositions of the particles. Growing quality consciousness on the part of both suppliers and customers has made quality monitoring an integral part of the industrial activity. Proper quality monitoring of coal involves implementation of standardized procedures for sampling, sample preparation and analysis to provide a reliable estimate of the desired quality parameters at minimum variance.   The basic purpose of collecting and preparing a sample of coal is to provide a test sample which when analyzed will provide the test results representative of the lot sampled. Detailed documented procedures are laid down in National and International Standards for executing the job of representative sampling pertaining to different methods of sampling. However, due to time, technical and other economic constraints strict implementation of the procedures is difficult to practice for routine monitoring job. Modified methodologies are implemented after mutual consent of the seller and the purchaser. It is a known fact that about 80% of the total variances involved at the different stages of sample collection, preparation and analysis come from errors during its collection only. The important issue that is not always considered is the effect of modified procedures on the precision of the final result. This often leads to different controversies between the seller and the customer.   Introduction to Mobile Coal Sampling Equipment : The Mobile Coal Sampling Equipment (MCSE) is the latest innovation from NuMAC. NuMAC has been working with the schematics and small models since 1996 and finally got the opportunity to developed the existing model in March 2008. MCSE is specially designed and manufactured for the purpose of collecting the coal samples for testing the coal quality for testing the coal quality using a mechanized Auger. In MCSE, dimension of the mechanized Auger have been designed by the IS-436 (Part-I/Section-I) standards. The equipment is mounted on a Hydraulically operated Retractable arm. It can be raised above the rail wagon and then lowered to collect the coal sample. The rotary motion of the Auger enables it to go down in the coal up to the desired depth and pick up the sample. The MCSE’s motor is reversed and the sample is collected in the desired bin. This complete assembly is mounted on a mobile unit that can easily go to the rail-wagon to be sampled.   Advantages of Mobile Coal Sampling Equipments : The main advantage of Mobile Hydro-Mechanical Coal Sampling Equipment is that, it helps power corporations to reduce the disputes with the coal suppliers by identifying the true sample of coal. The Mobile Hydro-Mechanical Coal Sampling Equipment works faster than manual collection. There is no room for any kind of human error or human bias. The sample collected by the Mobile Hydro-Mechanical Coal Sampling Equipment, is truly representative of the coal provided.

Development, Design and Manufacturing of Special Purpose Machines INSITU Machining of 'T' slot of Turbine Cylinder Wiper, Seal, Ring & Labyrinth for 140 mw Turbine ( Import Substitute ) INSITU Machining of Coal Mill Yoke with SPM Machines. INSITU Machining of Valve seat. Rebuilding and INSITU Machining of XRP Coal Mill Hub. INSITU Machining of Turbine Generator Rotor of Hydro and Thermal Power stations. (20mw 120mw 210mw Unit) INSITU Machining of RAH Shaft of Thermal Power Station.

PA Fan, ID Fan, FD Fan Impellers and shaft, Motor Rotor Shafts. Heavy Duty Roller Shaft, klin Support Rollers. Crane Wheels, Loco Wheels. Bearing Housing of sheet Milling mills. Rotor Crusher shaft ( Rebuilding ). High Pressure Control Valve, Feed Control Valve, Spray Control Valve. BFP Motor Rotor.

On Line Condenser Tube Cleaning System ( Ball Seperator ). Vibrating Screen, Conveyor belt return Roller, Compact drives, Tram Car Bucket, Hopper Grill, Hydraulic Testing Zig / Fixture for Automobile Industry. Cleaning Machines for Auto Mobile Parts.

In - house dynamic balancing of jobs (shafts, rotors, impellers) weighing from 25kg to 30 tons is done. We have been doing balancing of ID, PA, FD fan shafts & impellers, turbine rotors as well as pump impellers. We have also been doing dynamic balancing of jobs up to 3.5 M diameter and 5M length which includes single as well as two-plane balancing.

This invention by NuMAC, is related to rotary vane assembly and body liners for XRP type coal mills used in power station to pulverize coal. In XRP coal mill, rotary vane assembly is mounted on fabrication or in a casting. The main objective behind this invention was to provide a body liner rotary vane assembly. Following are some advantages of rotary vane assembly and body liners for XRP type coal mills:   To prevent frequent damages of the assembly. Easy to commission, replace and maintain. It outages and thereby the downtime of mill saves huge amount of power. The vanes are so locked so as to minimize welded joints and worn out vane will never fail due to two sided locking of pins. To overcome the problems and shortcomings with prior art techniques and approaches. Due to the specified angle in the body liners, the air pressure is equally distributed.