• LESER, The Safety-Valve.com

    LESER, The Safety-Valve.com

  • FLUITEC Measure. Consult. Treat.

    FLUITEC Measure. Consult. Treat.

  • GRANDPERSPECTIVE: We make visible the invisible hazard

    GRANDPERSPECTIVE: We make visible the invisible hazard

  • SPRANA: The UAN Analyzer

    SPRANA: The UAN Analyzer

  • CRU’s Sustainable Fertilizer Production Technology Forum, 20-23 September 2021

    CRU’s Sustainable Fertilizer Production Technology Forum, 20-23 September 2021

My UreaKnowHow

Both username as well as password are capital sensitive.

Our Sister Websites









UreaKnowHow.com: 7200+
UreaKnowHow.com & UreaNet.cn: 13200+
AmmoniaKnowHow.com: 1200+
Topics: 2000+
Posts: 9800+
Average posts per topic: 5+
Average posts per day: 2-3
Photos: 1200+
Videos: 340+
Revamp Guides: 

Safety Information

- Safety Risks in Urea Plants: 200+
- Safety Risks in Ammonia Plants: 1200+
- Ammonia Feed Piping Risks: 10+
- Risks during Turnarounds: 10+
For our complete overview of Safety Risks, Incidents and Near Misses, check out FIORDA

Follow us


Shell and tube heat exchangers are a vital part of the process in which these are installed and their condition can significantly affect the process economics in several ways. During the operation, deposition of salts t kes place on inside surface of the heat exchanger tubes which decreases its heat transfer. NFL carried out hydro-jet cleaning of tubes of final stage cooler of air compressor in Ammonia-! plant during March/April-015 shutdown. During hydro-jet cleaning, around 150 numbers of tubes were observed badly choked with hard scaling/ deposition. On detail inspection of choked tubes, it was observed that tubes were choked almost p to 2.5 meter length. The representatives of external agency expressed the~r inability as they do not have the drill of required length for de-choking. Options of chemical cleaning, replacement of tubes, plugging of choked tubes, etc., were explored. Mechanical department proposed to try the de-choking of the tubes mechanically by drilling method and in case it did not work, then tubes could be ;lugged. Since, time was available and with in-house effort, it was decided to proceed for de-choking of tube by drilling method. With efforts the tubes were de-choked successfully without any damage to tubes. Th article details the procedure ado ted for de-choking of tubes by drilling method.


Urea World News