Myntriang Phase 1&2

Customer: Assam Power Generation Corporation Limited (Karbi Anglong Assam State , India) Rehabilitation of PHASE 1 & 2 Type: Rehabilitation Type of Contract

Project Main Characteristics

• GUGLER FRANCIS-SPIRAL TURBINE with horizontal shaft; runner mounted directly on the Generator shaft; adjustable guide vanes; designed for the following data

Technical data

• • Net Head: = 64 m
• • Rated discharge:= 2.8 m3/s
• • Turbine output: = 1580 kW

Project Identification & Summary

• • Units were out of service for over 5 years
• • Altman carried out dismantling and inspection for two units I & II to find out root cause of failures and subsequently repair and restoration by modification, refurbishment and commissioning.

Major Issues

• • Severe Thrust Failure wear of Thrust collar, Journal Bearing and Thrust Pads
• • High Temperature problem at NDE brg
• • Altman carried out CFD analysis for Pressure Balancing Calculation to ascertain adequate
• • pressure balancing pipes
• • Modification of Pressure balancing system with connection of additional Pressure
• • Balancing pipes and arrangements of continuous monitoring of Pressure at Thrust chamber with trip
• • Upgrade of PLC and SCADA automation

Performance Improvement Plan that successfully achieved increases in:

• • Power Output
• • Efficiency
• • Availability
• • All of the plant Equipment was overhauled and refurbished for Power Plant Lifetime Extension.

Rehabilitation works mainly involved:

• • Generator
• • Turbine Pressure Balancing Retrofits
• • Balance of Plant ( Lubrication System &OPU)
• • Electrical AVR and automation part
• • Full Automation through SCADA

Activities at Altman Works

• 1) Grinding Thrust Collar to design surface finish
• 2) Rebabbitting of thrust pads and journal bearing based on calculation of final dimension of thrust pads
• 3) NDT at affected area (DPT, UT, HARDNESS).
• 4) Dynamic balancing of total rotating bodies
• 5) Indigenous development and manufacturing of critical spares like Labyrinth Seal, Wearing Ring.
• 6) Modification of Lubrication System

Our Capital Overhaul Offering (One Stop Solution to Revive Defects in Old Plants)

• • Major overhaul
• • RUNNER REPAIR & BALANCING
• • Spare parts supply
• • Major Overhaul
• • Installation of new excitation system
• • Spare parts supply
• • NDT, Hydraulic tests
• • Supply of a new control system: Distributed Control System (DCS), & SCADA
• • Replacement of wearing rings
• • Repair of under water parts
• • Polishing and truth check of guide vanes
• • Repair grinding of shaft gland
• • Retrofit of labrynth glands
• • Dry Calibration of guide apparatus

Electrical and Automation equipment

• • Excitation transformer replacement
• • Machine switch replacement
• • Installation of Bus-bar protection
• • AT cable replacement

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