One of the largest private electricity generators in Thailand recently experienced a loss of generating capacity in one of its six gas-fired generators which supplies the heavily industrialized area where it is located. With an urgent need for a swift and reliable repair, the local Sulzer agent was contacted, with a view to getting the 45 MW generator back up and running as soon as possible.

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1. Sulzer Generators

Thailand ranks among the largest per-capita power consumers in Southeast Asia and has an installed generating capacity of around 32 GW. Demand from local steel, textiles and rubber industries has resulted in power demand increasing at an annual rate of as much as 3.5%. With the local electricity supply under constant pressure, it was essential that the generating facility was returned to full capacity at the earliest opportunity. Taking an informed decision Once the initial request had been made, an experienced engineer from the UK was immediately dispatched to the power plant to start the investigation work. The initial findings and recommendations were compiled into a report which was handed to the client so that they could make an informed decision on the most appropriate course of action. The first and most obvious observation was that the generator was not located in a conventional generator hall but instead it was found in a more isolated, covered area.

This led to an initial issue with removing the rotor for repair since a large fence and other obstacles would need to be negotiated to allow the rotor to be inspected and repaired. In this case the preliminary investigation showed that there was a fault with the stator core and two of the stator windings would need to be replaced.

The report also made recommendations for the complete inspection of the rotor and made provision for some more routine maintenance procedures while the stator was being repaired. Once the repair scope and schedule was agreed, the Sulzer engineers were given a 16 day window in which to complete the repair and return the generator to service. While the local service agent maintained the communication with the client and organized the local aspects of the project, a team in Birmingham where the replacement coils would be manufactured coordinated the materials and personnel required. Delivering high quality Neil Fuller, Tendering & Projects Manager at Sulzer's Service Center in Birmingham commented, 'We provide technical support that enables our local service agents to deliver the high quality service that our clients expect. By working closely with the customer and keeping them fully apprised of the project, we are able to ensure the deadlines are met, even if we encounter unexpected issues.'

'In many cases we will provide a project manager for repairs such as this, but the client is always given a range of options when it comes to completing the repair. Depending on the urgency, we can support a 24/7 repair schedule and with our own coil manufacturing and testing facility in Birmingham, we can guarantee the new components are manufactured and tested prior to being transported to site where the team needs them.' Once the generator was handed over to the Sulzer team they needed a 220-ton mobile crane to lift the 12-ton rotor over the nearby obstacles so that it could be transported to a workshop for a full 'rings-off' inspection.

Based on the age of the generator a number of remedial works were carried out on the rotor that had been previously agreed, before it was tested and prepared for re-assembly. In the meantime, the damage to the stator core was repaired and the two new coils were installed before further testing was completed to ensure a reliable repair. Before long it was time to bring the crane back to the site to allow the rotor to be reinstalled.

Neil continues: 'As with many projects like this, we found some additional issues with the generator as the project progressed, but our continuous communication with the client allowed these to be solved easily without causing any further delay. This business is all about delivering quality within an agreed timescale and that requires a level of trust from the client which in turn is based on the experience and expertise of those completing the repair.' Detecting early warning signs As part of a wider maintenance program, the Sulzer team suggested that the remaining five generators should receive an age-appropriate inspection so that any early warning signs could be picked up and actioned. Again this recommendation was accepted and approved by the client based on the skills and expertise that had already been demonstrated on this project. Neil concludes: 'The continuing program will involve the engineers visiting the power plant at times when individual generators are taken off-line for planned maintenance.

This builds further on the working relationship that has already been formed and reinforces our commitment to deliver the highest level of service.' As a result of the successful inspection, recommendation and repair works carried out to restore the 45 MW generator to a fully operational state, prior to departing for their return journey, part of the repair team were invited to visit one of the client's other sites in order to complete some remedial works and preventative maintenance checks on several other generators.

Sulzer Generators

Two cycles are combined in one single plant. In a combined-cycle power plant, approximately 2/3 of the electricity generation comes from the gas turbine set and 1/3 comes from the steam turbine set. The combined-cycle power plants have relatively low investment costs, high efficiency and short time required to construct compared to other power generation technologies. Sulzer provides gas and steam turbine services to support you and make your power train operation more reliable and flexible.

We develop service solutions for all your rotating equipment in a gas-fired process. Gas fired power plant Natural gas is combusted in a gas turbine burner which drives a generator to produce electricity. The hot exhaust gases coming from the gas turbine are sent to a heat recovery steam generator (HRSG) to generate either subcritical or supercritical steam. The steam is directly sent to a turbine / generator unit to produce additional electricity, then passed through a condenser to convert it into demineralized water again. Sulzer supports this process with pumps for power island such as boiler feed water pumps (BFP), condensate extraction pumps (CEP), cooling water pumps (CWP), fuel injection pumps, NOx abatement pumps, make-up and other auxiliary pump services.