HRSG Boiler finned cleaning tubes maintenance service

SCOPE OF WORK

Phasel 1: cleaning by compressed air

1. The contractor is requested to submit the Risk Assessment and schedule for this job.
2. To separate each four fin tubes when cleaning for effective performance;
3. The cleaning areas require for HRSG- The back side and front side of module 5- The front side and back side of module 6- The back side and front side of module 7
4. Remove the deposit and scale stuck on the fin tube surfaces by blasting up to the first 7 rows of the tube module until visually clean in the constrained time. The dimension of each module is 17m Height x llm Width;
5. Clean all the dust, dirt, deposit and the scale on the following area:
   
   – The floors of all modules
   – The floor of lower scrawl spare and clean at the stack drain
    
6. Compressed air requirement: air pressure is 13 bar, air flow is 20 m3/min, and oilfree;
7. To collect Separately of fouling particulate between from the finned tubes and from the spare behind of module 7 and stack. Weight and then record for module one module.
8. Working shift and team as below requirement:

Phase2: Cleaning by CO2 ice method for the last two rows of module 7 (back side only) after compressed air cleaning

1. The contractor is requested to submit the Risk Assessment and schedule for this job (RA for cleaning by CO2 ice) and the method statement is provided by contractor);
2. Remove the deposit and scale stuck on the fin tube surfaces for the dimension of module 7 is 17m Height x 1 lm Width; xii Clean all the dust, dirt, deposit and the scale on the following area:

• The floor of module 7
• The floor of lower scrawl spare and clean at the stack drain again