Posted by Jack on June 03, 2000 at 21:41:58:
So tell me what you think about hand lifting safety or relief valves on a periodic basis while under pressure to ensure a positive flow path.
I have a State Safety Engineer in California telling us we should be doing this "frequently",but wouldn't define this what frequently was. He hinted that shiftly or daily would sufice. We have two 150 BHP scotch marine fire tube boilers.
Now I'm not saying he's wrong, bcause I know what his intentions are, but there are negative consequences to this which may only compound the problem and or create problems for you.
The code isn't necessarily clear on this, it suggests you should do it, but could cause wire drawing across the seats.
In the 10 years I was in the Navy I never heard of this nor had this done in any plant that I was in.