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About Us


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Established in the year 1956, we, "Rai and Sons Pvt. Ltd ", are a proficient provider of Maintenance and Repairing Services for all kinds of Diesel/ HFO based generators. Executed with industry approved tools and equipment, our assignments and services have gained popularity in the market for being cost-effective, reliable and time-bound. Our Product range includes repair and maintenance service for major generator engines namely MAN B&W, Mirrlees Blackstone, Wartsila, SEMT-Pielstick, Caterpillar, Waukesha, Nigaata, Fuji, Hyundai, Skoda, Kirloskar-Pielistick, Sulzer, Deutz, SKL, MWM and more.

Rai Prexim India (P) Ltd. was formed in the year 1993,in technical and financial collaboration with Prexim Diesel spol. s r.o. of the Czech Republic for achieving international quality standards in our services. Moreover, we have attained accreditation from international inspection agencies like Lloyd’s Register Asia, Indian Register of Shipping, American Bureau of Shipping and DNV.

Being an ISO 9001-2008 Certified Company, we render our services as per the set industry benchmarks with the help of our dedicated trained and certified service engineers and technicians. Our state-of-the-art infrastructure which spread over 10,818 square feet has helped us to serve the varied needs of clients in most appropriate manner. Further, our high quality services and friendly approach towards the clients has helped us to garner huge clientele. Our list of clientele comprises of Reliance Industries Limited, Aditya Birla Limited and Northern Railways. We have wide network with various well established branches in different metro cities across the nation.

Culture of Working

Our Culture of work is the vehicle through which our staff members coordinate their activities to achieve common goals and expectations. Our well trained engineers divide all the work related to inspection and reconditioning of heavy duty generators as per their capabilities. Also, we ensure that all employees have sufficient variety of tasks to enable them to use different muscles and postures and to make their job more satisfying.

We believe in providing a healthy work culture for our employees that leads to satisfied employees and an increased productivity. Further, we calibrate our advanced technological tools and highly precise instruments regularly for authenticity of accuracy. To manage all the things such as execution, regulation and reviewing all quality aspects and production standards, we have a key management personal.


Our Infrastructure facility is wide spread in an area of 10,818 square feet with two plants which are located at a distance of 26 and 38 kms from the centre of the capital city, Delhi. We have modernized workshop wherein all the repairing and maintenance work takes place. These workshops are well equipped with advanced tools machines and instruments, which help our professionals in their work. We have installed our Grinding Machines in these Plants which have been imported from world famous Manufacturer, M/s. VERECO spa, Italy. Furthermore, we also have our own fully loaded mobile service with computerized instruments to pinpoint the problem. All the tasks carried out in these workshops are done in a co-ordinated manner under the supervision of experts. With the help of such infrastructure facilities, we are able to provide prompt services to our clients.

Our Infrastructure personnel use different types of instruments and tools for their work, such as :
  • Hydraulic
  • Pneumatic
  • Machine tools
  • Computerized welding equipment
  • Flame-cutting equipment
  • Jacks and hoists
  • Computerized instruments to pinpoint the problem

Machines & Equipment Facilities :
  • Crankshaft Grinding Machines
  • 3-Dimensional Vertical Boring Machines
  • Cylinder Liner Honing Machine
  • Hydraulic Line Boring Machines
  • Pneumatic Line Boring Machine
  • Insitu-grinding & Polishing Machines
  • Rebuilding Machine
  • Bore Alignment checking with Easy Laser
  • Hardness Tester
  • Surface Roughness Testers
  • Ovality Measurement Electronic Equipment
  • Deflection Alignment Checking with Electronic Equipment
  • Crack Detection with U.T., M.P.T. and D.P.T.


For checking the dimensional wear/measurement of various Engine components with non-destructive tests for crack detection, following instruments are used at our Works and all these below mentioned instruments are periodically calibrated for their accuracies :

  • Digital and Analogue - Inside and Outside Micrometers, ranging from 0 – 800 mm. Mitutoyo Make
  • Digital and Analogue - Inside and Outside Micrometers, ranging from 0 – 800 mm. Mitutoyo Make
  • Electronic & Mechanical type Deflection alignment Gauges. Make – Sweden & Mitutoyo
  • Digital Hardness testers – Make Kraut Kramer imported from Germany
  • Surface finish tester of Mitutoyo Make & visual comparator UK Make
  • Digital Ovality measurement instrument. Make – Sweden
  • Easy Laser Equipment for Bore alignment checking. Make – Sweden
  • Puppy and Dial gauges of various sizes – make – Mitutoyo & Borletti
  • Ultrasonic and Magnetic Particle Testing Equipment – Make Magnaflux


With all are efforts, we are directed towards assuring utmost client-satisfaction. Serving customers effectively and efficiently has always been the main concern of our organization. We adhere to a set of quality objectives in order to offer effective and customized services to the clients within the stipulated time frame. Owing to the client-centric approach, timely delivery of orders, reasonable prices and customization, we have been able to win the trust of numerous patrons.

Due to this, we have earned a huge clientele that includes some of the following important names :

List of customers from Private Sector :

Reliance Group Of Industries J.K. Group Of Industries Good Year Group Of Industries
Cadila Health Care Grasim Industries Ltd. Kirloskar Oil Engines
Wartsila India Ltd. Rolls Royce India Ltd. TIL Limited
SRF Group Of Industries Tata Group Of Industries Ambuja Group Of Industries
Rajashree Group Of Industries Aditya Birla Group Of Companies Andritz Hydro Industries Ltd.
J.P. Group Of Industries Jindal Group Of Industries Shah Alloy Group Of Companies
Arvind Group Of Companies Torrent Group Of Companies Vardhman Group Of Companies
Bhilwara Group Of Companies K.l. Group Of Companies LPS Group Of Industries
Modi Group Of Industries Modern Group Of Industries ISGEC Group Of Industries
Somany Group Of Industries Asahi India Group Of Industries Century Group Of Industries
Flex Group Of Industries Magnus Power Limited Hindustan National Glass Ltd.
YKK India Ltd. Uniklinger Ltd. Hi-tech Gears Ltd.
Gimmco Ltd. Reliance Industries Limited Group Companies Aditya Birla Limited Group Companies
Major Cement Industries: JK Group, Aditya Birla Group, JP Group, Shree Cement Group Major Tyre Mfg. Companies: Good Year, MRF, JK, DUNLOP, etc. Marine Industries: Major Shipping Companies in India and Overseas
Major Captive Power Plants: L&T, Murgappa Group, SEDCO, etc.

List of Customers from Public Sector :

O.N.G.C. N.T.P.C. Indian Oil Corporation
Northern Railway Diesel Loco Modernization Works NALCO
IFFCO G.S.F.C. Limited Amse Airforce
Hindustan Aeronatics Ltd. Hindustan Zinc Ltd. Indraprastha Gas Limited
North Earthern Electrical Power Corpn Ltd Oil India Limited GSPL Niko Resources Ltd.
Ordnance Factory Field Gun Factory DLMW
Northern Railway etc.

List of customers from Shipping Industry :

Great Eastern Offshore Warm-seas Dubai Pioneer Shipping Dubai
M.S.C. Shipping Ltd., Hong Kong SNP Shipping Ltd., Hong Kong Five-star Shipping Ltd., Dubai
Gulsa Shipping Dubai Varun Shipping Ltd., Dubai Wallem Shipping Ltd.
Bangladesh Shipping Corporation. ABG Shipping Ltd. Orient Express Ship Management
Seven Island Shipping Ltd. Castle Shipping Ltd. Leo Shipping Ltd.
Damodar Marine Services Hilani Shipping KSS Shipping
TMB Shipping Efficient Business Services Lucky Marine Services
Lily Marine Shipping

List of Overseas Customers :

Indumij Marine Logistics Ltd., The Netherlands Techonomy System Ltd., Sweden Trans Arabian Technical Services Ltd., Saudi Arabia
Duggar Group Of Industries, Nepal Royal Group Of Companies., Nigeria Spintex Group Of Companies, Nigeria
Chellarams Group Of Companies, Nigeria Dangote Group Of Companies, Nigeria


We are a certified ISO 9001: 2008 organization for rendering highly reliable reconditioning services of major diesel engines. This has been possible for us with the help of our team of hard working Engineers & Technicians who are well trained and capable of carrying out various tasks related to repairing, electrical and electronic systems for preventive maintenance and inspection. Our main motive to get certification is to implement the set standards and to continuous improve the efficiency and effectiveness of company operations. We have received various certificates for our quality from various reputed International Inspection Agencies such as:
  • Lloyd’s Register Asia
  • Indian Register of Shipping
  • American Bureau of Shipping
  • DNV

Events & Participation

We often participate in various exhibition and events related to power generation and marine industries happening across the nation. These events give us the opportunity to understand and know exactly what kind of problems our clients are facing related to diesel generator engines. As per the latest market trends in this domain, we upgrade our technologies and instruments used while rendering our services.

Some of the Events and Exhibitions in which Rai Prexim participated are mentioned bellowed :
  • Inmex India, Mumbai
  • Power Gen, New Delhi
  • Marine Exhibition, Goa

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