Some people here will need to be educated to understand what "SIF" is before making any unrelated nonsense comments that wasting people's time to read or reply.
SIF can be roughly considered as stress concentration factor, which will multiply to the theocratical calculated stress to make the...
Don't understand what you guys are talking about, but you have only two choices, using power torque wrench, or bolt tensioner (we use it for bolt 1.5" diameter or larger, some company may use it 2" and larger).
How much for the torque for torque wrench, or elongation for bolt tensioner and...
Go to 4th Edition Pressure Vessel Design Manual by Dennis Moss, Procedure 4-11, Design of saddle supports for large vessel, you will see unit check rib plates. 3rd edition has similar. When people do not read books, they can't guide you. Many things in pressure vessel are not covered by codes or...
95% of vessels come with reinforcing pads on nozzles. Back gouging is very common before putting the first pass from the other side for all kinds of reasons.
Ignore r6155 comments.
I have designed many 900 mm or 36" vessels. Too many people in this post making things complicate, and lack of vision for convenience for maintenance purpose in the future.
Here are the thinking process;
1. Ask Process engineer to resize to 36" OD or 38" OD such that standard B16.46 series A or...
Cat "C" or "A" ? It is "C" which is considered as an integral forging/machined piece welded to plate. and which can have less stringent NDE requirements than A or B as indicated in many vessel specifications from oil companies or engineering firms.
Even the forging piece will be tapered and...
Strong technical knowledge is what you need. Ronak Patel has mentioned several books that I already have and studied through my entire career.
Two more for your references if you can still find them.
- Pressure Vessel Systems, a user's guide to safe operations and maintenance, by Anthony Kohan...
Sold metal plugs was used in lieu of grease in the past, if any people here old enough to know that. For uninsulated vessel, hey, plug is better than grease. Due to weathering, grease will be gone and who will run the risk of falling to re-grease any vent hole. Think before making your comments...
We need AI to read the code, feeding your sketch and question, and provide answer including where the code says right away, instead of so many people wasting time here digging out what in the code or your own interpretation on the code. I got tired of this.
Krausen, Cumo, both of you are exactly correct. Vent hole is for vapor to escape to avoid hydrogen induced cracking from the welding as well as other harmful particles from the welding process.
The hole is also so call Tale Tell Hole for a reason. I had a Russian project years ago, and client...
Your question is vague. Template is for construction to set the anchor bolt locations correctly to match the hole on skirt base ring. It is not mandatory as long as your buyer is not asking. But you shall ask if they need it.
Here is what we do in every project:
For skirt supported vertical...
We do solution annealing on all P8 formed head to remove residual stress due to past experience of cracking head in ethylene plant. It can either be the entire head solution annealed or only solution anneal the formed segments to remove residual stress due to forming. The final assembly welding...
Kwisatz, I also have such baffle in a "double-pipe" jacketed loop reactor. Those little baffle is to divert the flow, and only with very light weld, shall not be considered in any strength analysis, not to think it will play major benefit to the shell. Engineering judgment is to ignore its...
Interesting. I also have jacketed vessel (with half pipe and internal agitator). As other people said, check your calculation for external pressure due to the jacket design pressure. Most likely this was missed. In addition, internal force by the agitator due to the liquid viscosity and the...
Its wording "may be" is the key. That means, you decide and take the consequence. We ask vendor to grind/polish to reveal any defects beyond it, and do surface MT/PT. So it is your call.
I have gone through this on many new vessels due to extreme poor quality from shop. We did repair pitting and porosity. Attached is our action on each problem on several vessels. You shall be able to find one that fits your case. If pitting on plate, grind smooth the pitting and MT or PT the...
chaulklate,
Give me your MAWP, design temp, flange material, axial pulling out force (not pushing in force) and bending moment at the face of flange. The loading must be from CAESAR II pipe stress analysis for the loading at the FOF, not at the shell junction. You can give me the final...
