We have a few buildings each has the following shutdown key logics on the ventilation louvers:
To open the louvers: H2S Hi, and LEL Hi
To close the louvers: H2S Hi Hi, LEL Hi Hi and fire detection eye
Can anyone help on what are the reasons for such logic; is this because of the code...
We have a coldbox - Aluminum material, for the application of natural gas treating. The coldbox is experiencing fouling and in need of cleaning. Because of the Aluminum construction, I’d like to understand if there is any special solvent can be used.
Thanks,
Metengr, I know you are here to help.
I am thinking of a radiant heater which could have a tube temperature as high as 1700 F. However, I am trying to lower this temperature down to a point so that the tube material is relatively easy to get.
Having said that, if I am going to use 316L, what...
Gents,
Sulfidation occurs at high temperature. We currently have CS application of high sulphur content gas at temperature ~300C (H2S 2%, SO2 1%, CS2 0.1%) but low pressure (<40kPa).
I am looking at adding a fired heat exchanger to this stream, in which case, the heat exchanger tube temperature...
Agree with gr2vessels. In addition, galvanic process may introduce hydrogen cracking to high strength bolts. A 193 B7M Galvanized Bolts are prohibited by some organizations.
Cheers,
If you check ASME VIII Appendix 2, you will find that the type of flange gaskets governs the bolting material. From my experience, subject to the design temperature, B7M is good for spiral wound gaskets at most of the temperatures.
JTE is right.
VIII Div 2, App 5 provides guidelines for fatigue analysis. However, pay you most attention to all welds where stress concerntration has always been the fatigue initiation point.
If you want to take a consevertive approach, PD5500 may be an easier method.
Henry Kong, P.Eng...
I am sorry for any confusions. Let me make some clearifications.
1. This is a 42" vertical vessel, with WT 7/8". the vessel is for the service which requires PWHT. the vassel has two lifting lugs with WT of 1", welded at the top of the cylinder, ie the area of the seam of cylinder to the top...
I have an SA-516-70 vessel 42” dia x 7/8” thick shell c/w 1” thick lifting lug which covers the seam of head and shell. This vessel has been PWHT’ed due to amine service, and has been hydroed, inspected and stamped. Subsequent to these an attachment weld was made to the lifting lug cross the...
SA-194 does not have Ni and Cr composition requirement for Gr 4, neither Ni composition requirement for Gr7. However, the MTR showed these compositions. Is any percentage acceptable for Gr4 and Gr7 or this has to be rejected?
Thanks in advance.
Henry
1. You should realy pay attention to the welds and weld affected zones where failure (crack) will start. The base material is not a real concern.
2. My experience is that the designer should take into account the following factors: 1]. alternating stress level; 2]. SCF (such as type of...
Thank you all.
To further clarify, these valves are installed on the vessel maintenance drain lines. They are all 1-1/2" CL800.
My main concern at this moment is that if the leakage is the result of PWHT which may have damaged the valve seat. If a small amount of leakage is the nature of...
