Climate control is critical during blasting, painting and coating jobs in tank, bullets, columns, reactors, coke drums, vessels, pipelines, etc. High relative humidity causes condensation on the metal surface resulting in coating related problems like blooming or flash rust.. An adequately designed and applied dehumidification system during blasting, painting and coating operations will ensure that the RH inside the tank is maintained as per the technical specification, for optimum performance of the coating/painting to enable timely completion of the project.
Commonly faced Issues leading to shorter Coating life
There are several factors that contribute to the short life of the current coating systems, the most common being:
Poor surface preparation, as a result of uncontrolled environmental conditions leads to blistering, cracking, peeling and cratering on the surface. This results in improper adhesion between the substrate and the coating.
High relative humidity causes condensation on the metal surface which results in corrosion. Unfavourable environment during a coating application could cause blister and crater which may lead to coating failure. It is crucial that the temperature, relative humidity, and dew points are as per technical specifications. Industrial
coatings require a clean and stable environment where the correct temperature and humidity conditions are favourable.
Solution Maintain temperature, relative humidity, and dew points are as per technical specifications. Moisture levels should be controlled inside the tanks to increase the coating life. Maintain relative humidity inside the tank at <55% and temperature between 30ºC-35ºC.
TDS provides desiccant based Dehumidification system to maintain the recommended relative humidity levels. Condensing unit & Blowers help maintain temperature between 30ºC ~ 35ºC and provides adequate ventilation.
TDS dehumidification system:
Assure good quality coatings and meeting paint manufacturer specifications
Enables the blast, clean, and coat cycle to be done at any time of the year regardless of ambient conditions
Enables the contractor to reduce the project time by up to 35%
Enables the owner to reliably predict the downtime of tank
Increases the life of the coating
Dehumidification is a crucial factor for anti-corrosive painting. The cost of dehumidification is only approximately 2-4% of the total treatment cost of corrosion preventive painting. Moreover, dehumidification is often a prerequisite for the correct execution of anti-corrosive painting.
How TDS does it?
An adequately designed dehumidification system is used during blasting, painting and coating jobs to ensure the following:
RH inside the tank should be less than 55% during the entire period of blasting and coating, including night time.
Maintain a -5°C dew point differential between the air and surface temperature of the steel surface to be coated.
Maintain a -12°C dew point differential between the air inside and the air outside the tank.
Maintain a relative humidity of the surrounding air below 55%
Increase in coating & paint life by 1.5 – 2 times
Prevention of rust bloom, blistering and curing failures
Delivers specified temperature and RH conditions
Achieves RH levels sufficient to hold the blast and prevent rust
Improves the addition of paint on steel surface
Maintenance job can be done continuously without any interruption which results in decrease in downtime
Climate Control for Blasting, Painting and Coating
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Mr. Deepak Pahwa, Chairman, Pahwa Group & Director, Technical Drying Services Asia.
Mr. Deepak Pahwa is the Chairman, Pahwa Group and Director of Technical Drying Services Asia. Pvt. Ltd. The group has 1500+ employees in 6 continents & 11 manufacturing plants.
In 1979, he set up the first company in the group, Arctic India Sales, introducing dehumidification in India. Subsequently, he set-up Technical Drying Services Asia, Desiccant Rotors International, Delair India and Technical Drying services.
An alumnus of IT-BHU, Mr. Pahwa has been honored with several awards, including the “Leadership Award 2013” by IACC for his dynamic leadership. He was also awarded a “National Award 2011 in Research & Development” in (Medium Enterprise) by MSME, the “IT-BHU Alumni Lifetime Achievement Award 2009-10”, and also the “Entrepreneur Of The Year Award” in 1987 in the SME entrepreneur category, to name just a few.
Mr. Pahwa is a Fellow, ASHRAE (American Society of Heating, Refrigeration and Air conditioning Engineers) and serves on several technical committees of ASHRAE. A life member of ASHRAE as well as ISHRAE, he has been recognized and honored by various industry associations for his contribution in enhancing India’s role in providing the best in the next class technologies from India to the world. He has also introduced many new technologies in field of dehumidification, IAQ and many others in India since 1979. He has played an active role in connecting the European Air-conditioning federation, REHVA, to the Indian industry.
Currently, he is the Chairman, Committee on Innovation, PHD Chamber and also serves on the Chamber’s Managing Committee. He has also served as the National President, Indo-American Chamber of Commerce. He has also served as the Convener, FICCI MSME Committee.
He is an advocate of collaborative work for advancing knowledge and works with the specialists, in the field of Adsorption and airgineering technologies, in the academia as well as the industry experts, not only from India but all over the world including Japan, Singapore, Korea, Turkey, Europe and USA.
With almost 50 years of experience in engineering & marketing of HVAC&R, Airgineering & Environmental Control Technologies, his success mantra is “Innovation is Life”. He believes that with the right amount of inspiration, encouragement and knowledge, ordinary people can achieve extraordinary work.
He has institutionalized innovation within the organization so that every employee learns to be an innovator and rewarded for their contribution
For the Society at large, Mr. Pahwa, taking inspiration from his grandfather, Padma Shri, Rai Bahadur Dr. Mathra Das Pahwa, a renowned Eye surgeon and a dedicated philanthropist, Mr. Pahwa has mandated through the group’s CSR initiatives work on providing education, skill development health & hygiene and opportunities in sports for enriching the lives of the underprivileged and differently abled. Another focus area is working towards environmental sustainability, both through the technologies being introduced as well the contributions and support provided to environmentalists.