Another avenue to look at is the problem in some remote petroleum pipelines where theft of oil and piping xmas trees ocurr. A lot of the petroleum companies have put locking devices on their flanges to prevent opening or loosening.
Cheers
Ever thought about just making it a welded joint if leaks are a worry ? A welded joint costs more money to open and close, but if it is not a frequent event ....
Cheers
Sounds like someone in the past opened an access flange without proper approvals from the controlling authority. They might have had a close call of some sort from this event and as part of an investigation a locked flange was proposed as one of the corrective actions. I am only speculating...
First off, we should refer in future to these as "access flanges" and not "manways". Manways is a thing of the past and not politically correct these days. I have supervised many trades staff of both genders. Believe me, both genders come in all different sizes and shapes. Some are just not...
Not sure there is enough info in your description of what you need.... Is the lock out needed to prevent/warn people from opening the flange or perhaps closing it after it has been opened for a reason ?? Also to be "politically correct" these days we refer to these flanges as "access flanges"...
I think that general torque charts or databases should be made available to maintenance staff. However, my personal preference is to build up a more detailed database on each bolted joint in the facility. It may seem like a large task, but the end result is worth while. Each joint should be...
I have been involved for many years doing up small insulated flanges on large generators. Nothing in the size range you are talking about. A lot of large buried natural gas lines have insulating flanges just before the pipes go underground. They maybe a good source for your info.
In insulated...
Hi Folks,
Have a small problem at work. The mechanics use weldless eyenuts normally used for pipe hangers as rigging eyenuts as well. I told them that they are more than likely made to different standards and their uses should not be mixed up. They only stock weldless eyenuts in their...
Hello,
We have a problem with a lot of rust scale that formed inside long runs of 2"NPS steel pipe that usually contains turbine oil. When the unit is shutdown the lines are empty and open to atmosphere. The oil had in the past high water content due to poor operation of the oil...
Thanks Folks,
Some good ideas tossed around here.
I think it would take a team of one of our mechanical piping design engineers, turbine system engineer, a rupture disc and steam silencer company to resolve the problem. I am not at all convinced our configuration is proper. These...
Hi Folks,
I looked more into our rupture disc (20")failure problems. It seems they are prone to fail (at 400kpa) on turbine start up and shut down. There are lot of pressure transients at these times. It has been noted that the CV's & MV's controlling the deaerator failed to do so on...
I will talk to the operators tomorrow and ask what is the most common reason for blowing a rupture disc. It does not happen often and could be an in-experienced field operator. I know maintenance do not change the discs out on any routine basis.
dugal
Saxon,
We have about a 1/2 mile exclusion zone around the plant, then there is medium density residential, commercial and industrial area. Too much to buy out.
dugal
Under ideal operation conditions you should be operating with a slight vacuum between your turbine exhaust and condenser tubes. You can measure this with a pressure gage at at point between the two. Back pressure is your enemy. This is caused by too much steam, lack of cooling supply to...
I know anything causing back pressure would be a major operational danger to the deaerator. As Saxon said probably just by increasing the vent pipe size several pipe sizes up before the vent goes through the roof would certainly tone down the noise some. It may change the sound from a jet...
Hello,
We have large deaerators in our generating station that have a rupture disc on them (approx 10"). Ocassionally one will blow up a pipe through the roof. It goes off like a jet engine and there is lots of steam. Problem is, this scares the nearby residents and there are...
