NGS Apprentice Plant Mechanic Donovan Paul cleans the T-1 Turbine Bearing.
LeCHEE, ARIZONA – Lonnie Begay of Coalmine Mesa says his job as a millwright foreman takes him all over. But returning to the Navajo Generating Station for its annual overhaul feels as much like a homecoming as a job.
“When you come here it’s almost like a reunion,” the veteran of 13 consecutive NGS overhauls said. “You know a lot of people that work here almost like family. You get to spend some time close to home, and the pay is pretty decent.”
The 2015 overhaul of NGS Unit 3 began on Jan. 31. It is now more than three-quarters through its scheduled 58 days. Each year, it brings about 1,200 highly skilled craftsmen and professionals, from welders to engineers, both men and women, to perform and supervise 10,000 to 12,000 individual tasks.
Workers erected tall scaffolding to replace the Electrostatic Precipitator buss duct with a cable buss way. The “ESP” removes 99.5 percent of fly ash from emissions and was built into NGS when the plant was constructed in 1974, 1975 and 1976.
Among them are hundreds of highly skilled Navajo craftsmen and craftswomen who travel the country from power plant to power plant, said Brian Mabey, who is in charge of planning and coordinating NGS’s overhauls.
“Through the years, many have said they look forward to this time to spend two months with their families while earning high wages,” Mabey said. “In recent overhauls, as much as 98 percent of temporary workers are Navajo.”
Lonnie Begay said his crew’s job on this year’s overhaul is to inspect and repair the huge feeders that deliver coal to massive pulverizers that crush coal to the consistency of baby powder.
“Every year we need to repair bearings, replace belts and pans and rollers,” he said. “(The overhaul has) been going pretty good for us, which it usually does.”
In a major overhaul, the entire turbine and generator are completely disassembled, inspected, repaired where needed and reassembled to specification. The boiler, boiler feed pumps, auxiliary turbines, precipitator and many dozens of other pieces of equipment are torn down to their essential components and rebuilt like new again.
All of a unit’s instrumentation is recalibrated to ensure accuracy and precision. All ducts, fans, pumps, steam lines and valves are inspected and repaired to last until the next overhaul.
“The commitment to and investment in this kind of quality maintenance by NGS’s owners and managers are what has given the plant its long, productive and efficient life,” said NGS Plant Manager Robert Talbot. “It is the primary reason NGS runs better, cleaner, more efficiently and more dependably today than ever.”
A key to a successful overhaul is experience and know-how, particularly when thousands of parts are disassembled. Jimmy Begay from near First Windmill in Coppermine Chapter is a plant mechanic who has worked at NGS for 37 years. It is employees like him who bring that experience to the overhaul.
Plant Mechanic Jimmy Begay, who has worked at NGS for 37 years, works on the re-assembly of one of the 88 massive diaphragm halves, the heart of the Unit 3 Turbine.
Today, Jimmy is working on the re-assembly of one of the massive diaphragms within the Unit 3 turbine. In the center of the circular diaphragms are turbine rotors that spin at 3,600 revolutions per minute. These turn another 48-foot-long rotor within the generator, nicknamed “the pickle,” to create electricity.
Jimmy watches carefully as each half of the many diaphragms is gently lowered into place with an overhead hoist.
Is this a difficult job? “Not if you’ve been doing it for several years,” he says. He’s done it for 10 years.
Millwright Ernest Littlefoot is from Kaibeto. When not working overhauls, he’s an Automotive Service Excellence-certified technician with a job in Flagstaff.
“I’ve been working the overhauls for the last 14 years,” Littlefoot said. “Once a year we get out here to make a little bit of pocket change, and we go from there. When we’re done here at NGS, we’re scheduled to go out to CGS (Coronado Generating Station in St. Johns, Ariz.) and we do the same thing, millwright.”
This year his crew is completing the bearing inspection on the induced draft fans, he said.
“We do a thorough inspection of the induced draft fans and forced draft and primary air fans,” he said. “And if it needs replacement, we get with our liaison and we go from there.”
NGS produces its 2,250 megawatts of power 24 hours a day. For more than 40 years, all of its equipment and parts that make its three generating units work in synchrony have been inspected and repaired through these annual scheduled outages.
“NGS recently received high national rankings for 2013 for both our annual power production and reliability,” said Paul Ostapuk, NGS environmental and safety manager. “The December 2014 issue of Power Engineering magazine listed NGS sixth in the nation for total power production when compared to all coal-fired power plants in the United States.”
Nationally, the power plant was ranked 20th in the nation in reliability with a capacity factor of 86.9 percent, he said.
For each overhaul, planners, schedulers and coordinators work out a finely choreographed sequence of the thousands of tasks to be done from beginning to end.
“They can estimate to the hour six weeks out when a particular job should begin, how long it should take and when it should be completed – and for the most part it is,” Brian Mabey said.
Each day begins with managers, engineers, inspectors, schedulers, supervisors and contractors meeting to discuss the previous day’s work and the issues that arise.
“The first priority and first topic of discussion is always safety,” Mabey said. “Salt River Project, which manages NGS, and its overhaul primary contractor Zachry are proud of their commitment to safety for everyone who steps onto the plant site.”
While the work being done at NGS won’t be apparent to most western Navajo and northern Arizona residents, the positive impact on the local economy will be, Talbot said.
“The workers who come to Page will stay in our motels, fuel up at our convenience stores, have their vehicles serviced in our auto shops, spend in our businesses and eat in our restaurants, ” he said.
“Absolutely,” said Bill Zeglin, owner of the popular Dam Bar & Grill in Page. “Just more people coming in the door, more dollars coming in. Our numbers are up from last year, our overall revenue.”
Zeglin says businesses like his look forward to the NGS overhauls that precede the annual Lake Powell tourist season.
“Especially when they’re major overhauls,” he said. “When we hear that there’s any overhaul, we’re happy about it because we know they bring the out of town people who have to eat out.”
Page Mayor Bill Diak said he took the pulse of local businesses himself recently to see how the overhaul has benefitted Page businesses.
“Zapata’s (Mexican restaurant) has been up and I can tell that they’re overhaul people because they’re all male and there’s five seated at two or three tables,” he said.
Page has just had its best year in terms of tax revenue, and certainly some of that is attributable to NGS overhauls, Diak said.
“We’ve set all kinds of records,” he said. “Five months of all-time records. We’re up approximately 22 percent.”
Walmart, one of Page’s largest retailers, has felt a steady bump in business during this overhaul, said store manager Craig Milam.
“Definitely, the overhaul is something that impacts our business,” Milam said. “Last year and this year, we planned it as we would any other season – Easter, Valentine’s and whatever we go through. The biggest areas that I see from an impact stance is our evening business with our deli. Sandwiches, salads, our hot foods, cold salads, things of that nature, all take a spike. We see the guys come in as a group.”
So far, Walmart sales are up 12 percent, he said.
“You definitely are seeing an impact,” he said. “I would say that this is because it is a major overhaul.”
Walmart is not only benefitting from the overhaul, Milam said, it’s contributing to it.
Some of his workers take a leave of absence in order to work the overhaul and then can come back to Walmart when it’s completed.
“If it doesn’t turn into a job for them at the plant, then they come back to me,” he said.