Alex Manchenkov, senior engineer and operations manager at Evans Hydro, has agreed to take part in the ASME Combined Cycle Committee Pre-conference workshop entitled “Combined Cycle 101”, which will take place at the 20th International Conference on Nuclear Engineering and is collocated with the ASME Power Conference in Anaheim, California. The 8-hour course offered to end users occurs July 30th through August 3rd and the topic presented by Alex will emphasize the critical pumps found in combined cycle plants, including boiler feed, vertical circulator, condensate, and raw-water pumps. For more information, please contact Angie Vruno at 562-618-7719 or send an email through the Evans Hydro contact form.
Written by: Dr. T. Ravisundar, Ravi Somepalli, and Bill Nagle of HydroAire Inc. Publisher: Pumps & Systems / December, 2011
An Interesting Challenge and Cause for Collaboration
A major nuclear power company approached an independent Pump Performance Test Lab in Chicago to discuss a series of tests for their Pacific 4” BFIDS in safety-related service. These auxiliary feed water (AFW) pumps were utilized in two pressurized water reactor plants to supply backup cooling water to the steam generators in the event the main feed water source was interrupted. The plants had been designed to utilize an air void between two motor operated valves to keep separate two different suction sources to the pump. The Nuclear Regulatory Commission (NRC) guidelines dictated that no more than a 2% air void could be passed through the pump to reliably assure its safety-related function. The nuclear power plant engineers believed the pump could ingest a greater margin of air without damage or impairment to pump performance. The NRC gave the nuclear power company an opportunity to demonstrate the capability of this pump by allowing them to conduct and monitor a series of transient air-void tests at the independent Pump Performance Test Lab.
The independent pump performance test lab in Chicago, IL.
Engineers Working Together to Define Test Scope
The nuclear power plant engineers worked closely with the engineers at the Test Lab and a third party engineering consultant to develop the scoping document which defined the tests needed to demonstrate the pump’s capability under a range of scenarios. To design these tests, the team first reviewed the system configuration at the plants.
For added safety, each unit at each plant had one motor driven and one diesel engine driven AFW pump. Each AFW pump had been installed and aligned through valves and piping to take suction from either the non-safety related condensate storage tank (CST) or the nuclear safety related essential service water system (SX). The SX system is the nuclear safety related system that is connected to the plants ultimate heat sink (UHS), which is raw river water. As can be imagined, there is considerable difference in the purity of the water between the CST water and the SX water. Therefore, both plants intentionally built in the air void as a provision for separating these two systems to reduce the chance of SX water contaminating the clean condensate side of the system.
After thorough review, the team issued specifications for ten different sets of test cases which encompassed several operating conditions and well over 35 test scenarios. The tests would cover injection of different void volumes into the pump operating with several variables, some of which included different flow rates, suction pressures, and pump statuses (i.e. operating pump, idle pump with a pump start while suction is being transferred, etc.).
Configuring the Test Lab
Once the scope had been clearly defined and agreed upon, the Test Lab engineers set out to configure the Test Lab in a way that would duplicate almost identically the plant’s AFW suction piping set-up. Within 10 days, the Test Lab was configured with a booster pump installed with a variable frequency drive to simulate the SX system as closely as possible so that the safety-related AFW pump could be operated within the same environment as it would function in the plant. The SX water source came from the Test Lab’s 38,000 gallon suppression tank which was fed through the booster pump. The CST, which was simulated by the Test Lab’s suppression tank, was not sent through the booster pump.
HydroAire’s new facility, located at 1126 West 40th Street, has 46,000 square feet dedicated to pump aftermarket services. In addition to large machining equipment and 82 tons of crane capacity, the new facility has a 5000 HP Pump Performance Test Lab, which is the culmination of a two-year effort to bring the best and most comprehensive range of pump services to the pump aftermarket.
On Wednesday and Thursday, September 29th and 30th, 2010, HydroAire proudly unveiled its brand new service center and Test Lab at a festive Open House attended by hundreds of customers, dignitaries, neighbors, and friends. In addition to music, refreshments, and a slideshow on the history of HydroAire, the Open House included guided tours of the new repair facility and Test Lab by HydroAire’s engineers, mechanics, and executives. HydroAire Executive Vice President Jay Shah stated “We’re pleased to open this state-of-the-art facility in order to better serve our customers in the Greater Midwest area – customers in businesses such as power plants, refineries, the oil and gas industry, and the steel industry.” Continue reading →
Written by: Kwa Soo Teck, Phu My 3 Power Station (Vietnam), & Chandra Verma, Hydro Australia
Publisher: Pumps & Systems / September, 2011
Phu My 3 BOT Power Station, a Vietnamese power station using combined cycle gas turbine technology and operating at 749 megawatt capacity, had been experiencing some problems with their vertical pumps. The station asked Hydro Australia to assess the damage and assist with a solution.
The power plant in Vietnam
The vertical pumps were used for the circulating water system. The impeller material was a super duplex and the product being pumped was sea water. Over a period of three years, Phu My 3 had experienced catastrophic failures with the impellers and were unsure of the cause. The first pump was installed in Sept 2003 and the first blade failed in September 2008; the second failure occurred in Sept 2009 and a third failure occurred in June 2010.
On viewing the damaged impellers, which weigh 850 kilograms, it was obvious the quality was poor. The first step in the process was to send over an engineer with a Romer Arm, a 3D coordinate measuring instrument, to reverse engineer the impeller. This data could be used to analyse the existing impeller design.
Hydro South is pleased to announce their expansion into a 27,000 sq. ft. facility located in the northeast sector of the Greater Atlanta area. Hydro South’s new facility provides increased capacity for high quality, rapid response pump aftermarket services. Having joined the Hydro Companies as President of Hydro South in 2009, Sam Zingales says, “We’re very excited about our continued growth and enhanced capability.” The new building also features a training room where Hydro South plans to conduct a variety of pump training courses to serve the needs and concerns of the aftermarket pump user.
Hydro South is pleased to announce their expansion into a 27,000 sq. ft. facility located in the northeast sector of the Greater Atlanta area. Hydro South’s new facility provides increased capacity for high quality, rapid response pump aftermarket services. Having joined the Hydro Companies as President of Hydro South in 2009, Sam Zingales says, “We’re very excited about our continued growth and enhanced capability.” The new building also features a training room where Hydro South plans to conduct a variety of pump training courses to serve the needs and concerns of the aftermarket pump user.