Some improvements for mechanical seals on mid-pressure ammonia pumps in our plant is summarized,A performance contrast is analysed and some application recommendations are given in future service preferentially for the metal bellow type mechanical seals.

• 结合某中压热氨泵的机械密封改造 ,对金属波纹管机械密封与普通机械密封的性能对比进行了分析 ,指出金属波纹管机械密封可以在很多工况下取代使用 ,辅助密封圈的普通机械密封。