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首页> 外文会议>Association of State Dam Safety Officials, Inc. 2002 Annual Conference Sep 8-11, 2002 Tampa, Florida >FAILING SPILLWAY TRUNNION THRUST WASHERS AT PRIEST RAPIDS DAM
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FAILING SPILLWAY TRUNNION THRUST WASHERS AT PRIEST RAPIDS DAM

机译：牧师大坝的溢洪道溢洪道止推垫圈

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摘要

Self-lubricating bronze bearings, while state of the art 45 years ago, have definite limitations to their environmental suitability. This was discovered at the Priest Rapids Dam spillway, where ammonium compounds derived from bird droppings caused stress corrosion cracking of a susceptible alloy in the trunnion bearings. Even though the bearings performed quite well for 45 years the owner decided to replace the failing bronze material with new technology synthetic materials. The trunnion thrust washer and bushing replacement project is scheduled for completion in 2005. Because the project schedule was set up to rehab the most severely damaged trunnions first, by March 2003 almost all the cracked thrust washers will be replaced. The District believes the new trunnion bushing and thrust washer materials will prove to be at least as trouble free as the original installation. In addition, the new materials should have a lower coefficient of friction, thus decreasing the stresses in the arms. What remains to be proven is the new Orkot~(~R) synthetic material's long-term durability in this application.
机译：自润滑青铜轴承在45年前就已发展到了最先进的水平，但对其环境适应性有一定的限制。这是在Priest Rapids大坝溢洪道上发现的，那里禽鸟粪便中的铵盐化合物导致耳轴轴承中易感合金的应力腐蚀开裂。即使轴承在过去45年中表现良好，所有者还是决定用新技术合成材料代替失效的青铜材料。耳轴推力垫圈和衬套更换项目计划于2005年完成。由于该项目的制定是为了首先修复受损最严重的耳轴，因此到2003年3月，几乎所有破裂的推力垫圈都将被更换。学区认为，新的耳轴衬套和止推垫圈材料将至少与原始安装一样无故障。此外，新材料应具有较低的摩擦系数，从而降低手臂的压力。尚待证实的是新型Orkot〜（〜R）合成材料在该应用中的长期耐用性。

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