Service contract for Overhauling job of Unit-4 ESP (4 passes, 72 Nos. Fields) in 2026 at SGTPP.

DRY CLEANING WORK Thorough Dry cleaning of ESP starting from ESP inlet funnel up to ESP outlet funnel, all ESP hoppers, Gas distribution Screens, all emitting electrodes and collecting plates and other allied zones. Suspension zones in between CERM/EERM Frame and ESP ceiling to be checked and cleaned properly. After de-synchronization of Unit, all hopper doors (288 Nos.) are to be opened for smooth removal of ash. After completion of total overhauling job, all hoppers must be checked finally and cleaning & removal of ash/clinker or any other foreign material if persist. Then all hopper manholes have to be boxed up properly by total replacement of old gaskets with new ones with adhesive and tightness checking. Stipulated Period of Work: Day-2 to Day-4- 04 Number of separate manpower gangs to be engaged for working at a time in 04 ESP Passes. Report to be submitted to department by 4th day evening or 5th day morning.

WATER JET CLEANING WORK Thoroughly HP Water Jet washing from top to Bottom of ESP internals (72 Nos Fields), including all hoppers, collecting plates, emitting electrodes and other allied zones till metallic surface exposed and completely free of ash deposits. Four number HP Pumps must be put in service in parallel from 04 (Four) different Water outlet points provided at site. At the time of water washing if any chocking found in the hoppers, same shall be cleared immediately. Suspension zone in between CERM/EERM Frame and ESP ceiling to be checked and cleaned properly. All necessary equipment including sufficient number of hose, nozzles and four nos booster pumps (discharge pressure of 4-5 Kg/sq.cm) will be arranged by party. Stipulated Period of Work: Day-3 to Day-9 - Two separate groups of manpower should be engaged at a time by round the clock without fail until finish this job within stipulated time. Daily work progress and respective checking report to be submitted within 48 Hrs of Unit De-Synchronise. After water washing of all the ESP internals, detailed field inspection of all fields to be carried out by the party along with experts engaged by departmental authority and share the findings to departmental authority.

INTERNAL CHECKING AND RECTIFICATION Field gauging of each Collecting Plate to maintain a gap of 400mm by Go Gauge (72 Nos of ESP fields in A, B, C & D Path). Job to be carried out by specialized separate manpower, experienced to perform identical job at ESP. Re-fitting of new spacers if required. Each & Every emitting frame alignment shall be checked thoroughly. Stipulated Period of Work: Day -6 to Day-20 -Simultaneous work must be going on in 02 passes at a time by two separate expert team. Everyday findings and its rectification report to be submitted. Rectification job to be strictly carried out as per reports/findings of expert engaged by departmental authority.

CERM SYSTEM CHECKING The complete collecting electrode rapping mechanism with all its plain bearing, inner arm, outer arm, shock bar, shock pad, Shock Bar Guide Plate, shock bar guide assembly (Rapping and non-rapping side) and its attachment, rapping shafts, Pin wheel, hammer assembly, Anvil Bar and corresponding fasteners, Guide angle, PL attachments of Rapping and non-rapping sides are to be thoroughly inspected and necessary replacement/ modification/Fitting of missing components and tack welding of bolts are to be done as per the instruction of experts engaged by departmental authority. The Rapping shaft straightness are to be checked and if necessary, the bend/worn out shaft to be repaired/replaced and complete alignment of the shaft to be done as per expert engaged by departmental authority. Rapping shaft rotation to be checked and ensure for every hammer hitting position with respective shock bar position correctly for CRM. Straightening of misaligned shock bar and its assembly are to be done and gap between the electrodes to be maintained as per expert engaged by departmental authority. The clearance between the shock bar and guide assembly should be measured and modifications to be carried if required. Stipulated period of Work: Day -6 to Day-20 - Work has to be going on in 02 passes parallelly by two separate expert team. These teams are separate than the manpower engaged in field gauging job. Daily observation report and corresponding rectification status to be submitted. Rectification job has to be carried out as per reports/findings of experts engaged by departmental authority.

EERM SYSTEM CHECKING The complete emitting electrode rapping mechanism including its pin wheel, thrust pad, bottom bearing, hammer assembly etc are to be thoroughly inspected. Replacement / Fitting of missing components, bearings, Pin wheel, thrust bearing, thrust pad, bottom bearing, hammer assembly of all the rapping mechanism, if required after checking for ESP Fields. The shaft straightness are to be checked and if necessary the bend/worn out shaft to be repaired/replaced and complete alignment of the shaft to be done as per expert engaged by departmental authority. Rapping shaft rotation to be checked and ensure for every hammer hitting position with respective Emitting frame position correctly. Stipulated Period of Work: Day -6 to Day-20 # The work has to be going on in 02 passes simultaneously by two separate expert team. These teams are separate than the manpower engaged in field gauging job. Each day findings and its rectification report has to be submitted. Rectification job to be strictly carried out as per reports/observations of expert engaged by departmental authority.

GDRM SYSTEM CHECKING Checking and rectification of GD Screen rapping system thoroughly. Replacement, Repair & Alignment of rapping shafts, bearings, hammer assembly of all the rapping mechanism, if required after checking. Rapping shaft rotation to be checked and ensure for every hammer hitting position with respective shock bar position correctly for GDRM. The shaft straightness are to be made and if necessary the bend/worn out shaft to be repaired/replaced and complete alignment of the shaft to be done. Stipulated Period of Work: Day -10 to Day-16 - The work has to be going on in 02 passes simultaneously by two separate expert team. Daily report and respective rectification status to be submitted to controlling department. Rectification job has to be strictly carried out as per reports/findings of experts engaged by departmental authority.

SHAFT INSULATOR SYSTEM CHECKING Cleaning & inspection of all Shaft insulator and its heater thoroughly & replacement or repair if found damaged. Heater resistance to be recorded. Proper box up after the job with gasket replacement if found damaged. Cleaning of shaft insulators to be done in 02 phases (after water washing and again before final box up by petrol). Stipulated Period of Work: Day -8 to Day-18 - Thorough cleaning by petrol to ensure full dryness. Separate group of electricians is to be engaged. Each day finding report and necessary rectification report to be submitted. Rectification job to be strictly carried out as per reports of expert engaged by departmental authority.

SUPPORT INSULATOR SYSTEM CHECKING Cleaning & inspection of all Support insulator and its heater thoroughly & replacement or repair if found damaged. Heater resistance to be recorded. Proper box up after the job with gasket replacement if found damaged. Cleaning of Support insulators to be done in 02 phases (after water washing and again before final box up by petrol). Stipulated Period of Work: Day -8 to Day-18 - Thorough cleaning by petrol to ensure full dryness. Separate group of electricians is to be engaged. Each day finding report and necessary rectification report to be submitted. Rectification job to be strictly carried out as per reports of expert engaged by departmental authority.

HOPPER HEATER CHECKING Hopper Heater field junction box cleaning, inspection, tightness of terminals. Hopper heater. Replacement / Repair & Cleaning of Hopper Heater. Hopper heater IR checking, resistance measurement, current measurement etc. & all the final readings (after overhauling) to be submitted to departmental authority. Replacement of Hopper heater if found damaged OR faulty with new one. Checking of heater jackets for any ash accumulation and damage followed by repairing of the same. Replacement of Hopper heater power cable from field junction box to support insulator JB if found faulty OR damaged. Cable will be provided by WBPDCL. Stipulated Period of Work: Day-10 to Day-20. Same electrician groups to be engaged as for Support & Shaft insulators. Each day finding report and simultaneous rectification report to be submitted. Rectification job to be strictly carried out as per reports/findings of expert engaged by departmental authority.