Usually contractors and users include performance test in the base scope of the purchased compressor. However during bid conditioning, the Engineers tend to give less attention to the evaluated bidders’ shop test capabilities.
Alstom has until June 23 to decide on the GE offer for takeover. But it seems that either the French government or the EU anti-trust commission would be able to beat back the GE push despite the Alstom board being favourable to the GE offer.
Alstom has said that it would open its books to Siemens just as much as it did to GE, not more. But the Siemens offer would likely exclude the train division that would function as an independent French entity.
Interference Diagrams” also termed by some as “Safe Diagrams" are utilized for fully-coupled rotating blades. In Reference No. 1 resonance where harmonic of speed is equal to nodal diameters is reviewed, along with when difference in numbers of blades and vanes equal to number of diameters.
The first item to be realized is that radial or axial rubbing is not a machinery malfunction. A rub is secondary indicator that occurs when there is contact between rotating and non-rotating components. Some of the primary causes that can lead to a rub are:
·tight or incorrect clearance
·rotor bowing, etc.
Shanghai Electric Group has agreed to pay 400 million euros ($555 million) for 40 percent of Ansaldo Energia that makes utility-size gas and steam turbines. Ansaldo – once a licensee of Siemens V series – supplies gas turbines including for low calorific value gases.
Last week, we had indicated that the turbomachinery industry will likely major shifts with GE and Siemens planning to take over Alstom and Siemens eyeing Rolls-Royce's energy turbine and compressor business.
After determining how long you want the equipment to last and identifying the process and fluid properties, it is time to select the pump. Factors for minimum life cycle costs include installation, maintenance, energy, safety and environmental and possibly other considerations.
In the next 10 days, the turbomachinery industry may see some of the biggest corporate swaps. With GE and Siemens competing to buy all of Alstom, Rolls-Royce has announced that it is mulling a deal with Siemens to sell off its aeroderivative turbine and compressor business.
Electrostatic Spark Discharge (ESD) is a phenomenon that occurs when oil generates sufficient static electricity to form sparks. This form of oil degradation has been studied extensively in many systems, including large frame gas turbines. Although most power plants are now aware of this form of turbine oil degradation, there is insufficient clarity on how critical of an issue ESD is.
The supercritical CO2 power cycle is one of the most promising power technologies. It is not by chance though, because carbon dioxide (CO2) has a unique combination of attributes, such as a low critical temperature, an environmentally natural origin, a high standard of safety and a low cost.
GE is releasing air-cooled H-class gas turbines. Two versions will be available for the 50 Hz market (9HA.01 and 9HA.02), and two versions for the 60 Hz market (7HA.01 and 7HA.02). GE’s first steam-cooled H-class turbines also operate at more than 2600°F. But sales have not been as robust as expected.
Stick-built plants are said to offer the lowest cost to fabricate and ship to site. And stick-built construction is often chosen if the shipping of modules has to occur within a small window of favorable weather conditions, or because of local politics or labor constraints.
One of the problems that might have to be faced when operating steam turbines is shaft inflection, or rotor bowing, a condition that can be either temporary or permanent. Temporary bowing is usually solved with the cooling down of the turbine, so that it does not need further actions.
A case study presented by Behrooz Ershaghi of Atlas Copco Mafi-Trench, Faisa Saez of British Petroleum and Marc LeDuc of Atlas Copco Mafi-Trench at the 41st Turbomachinery Symposium explained how magnetic bearings can be protected from external factors and process contaminations.
Whether one is talking about reactors or renewables, turbines or transmission systems, most of the attention goes onto making sure enough Megawatts (MWs) are generated to match the MWs being consumed at a given point in time. But in planning for future capacity, it is not just real power that matters, but complex power, that combination of real and reactive power that makes it possible to deliver the greatest quantity of real power over a transmission line to the end users.
(This is Part 2 of a two-part series. Click here for Part 1)
Wolverine Electric’s Burnips unit, according to GE records, was the first of 2 STAG units of 21 and 11 MW CC output that went operational in 1967. Both are still running.
The 11 MW unit operates for the City of Ottawa at 1600°F firing temperature and 895°F exhaust to produce 35.2 %. Station chief Randy Boyles provided the following information:
The first gas turbine ever introduced in Neuchatel Switzerland in 1939 had only 17% efficiency. Its simplicity was a challenge to the more complicated steam cycle to be later married into a combined cycle (CC) as both the Brayton and Rankine cycles improved. The earliest CC units achieved 32% efficiency in1961. 50 years later, they had reached 61%.
As the gas turbine industry continues to move towards increasingly advanced and efficient turbines, the costs of component maintenance and replacement continue to be a crucial factor for economic viability. Most strategic planning tends to be around the refurbishment and replacement of flow path components.