John,
thanks for the response. I fully accept that the best way is to model accurately, and it would be my very strong preference to have all the data available in order to do so.
For the record I am against the gung-ho approach i see being adopted and I have been using this forum as a double...
Big Inch,
thanks for the response. You have confirmed my fears, re any assumptions being unsafe.
the design temps are so varied because of an upset condition, i.e. potential CV failure leading to hot gas going down the wrong pipe, or safety venting.
p.s. please don't respond to the air v...
John,
thanks for the exceptionally detailed response. I have 12 years experience in oil and gas industry so adherring to codes is very much in the blood. I fully understand that codes must be read and understood, and they dictate the allowable stresses to be used and the load case...
John Breen,
thanks for response.
I made some asusmptions re. my post and the recognition of my engineering background (dubious as it evidently is). I am reasonably well versed in codes and standards, but without knowing the minutae of 31.3 for example.
The design code will be BS, and whilst...
note that you most certainly do not want to perform a vacuum test unless 1) your pipe is designed for full vacuum, 2) that you have flanges, gaskets etc that are designed and specified for vacuum. Note that pipes are essentially much 'weaker' in vacuum than pressure, so essentially taking the...
Pressure loss through holes can calculated using standard theory and loss coefficients. What is important is the length of the slots (or to put it another way) pipes through which the gas travels, i.e. can it be considered a flat plate across which the gas travels in a transverse direction. You...
A client wants us to stress check a system comprising new pipe designed by my co. and tie-ing in to exisitng eqpt and pipe system already installed and operating.
Alas the clients docs are ambiguous in the definition of the pipe in-situ, varying from HFS32 to ASME 106 grade A or B. The...
MJC,
thanks for the advice re. forum to be honest I went to the forum where the top guys in terms of number and quality of response posted according to the stats, you funnliy enough are one of the guys whom i hoped took the bait.
I wholeheartedly agree on the correct approach but alas the...
thanks for the response, but the problem is that we won't know what the configuration of the piping will be until we have cut it out and inspected. The new piping has to be installed within 2 weeks, my stress guys are telling me they need 6 weeks for the analysis (of 2 lines), i don't believe...
- Client wants us to stress check a modified pipe
re-routing utilising as much of the existing pipe as possible. The client is going to free issue us with new pipe to replace sections that are rejected after inspection. Seems simple enough, however, the original system was designed to BS 3608...
