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I have the same situation many years ago that we ask vendor to weld a buffering layer of weld overlay, then after PWHT, weld the SS support ring to the buffering layer. The buffering layer is welded to the base metal for major load bearing support.

Don't worry that much. Use method B and round attachment without considering weld size to ease your life. For sure you can add weld to round attachment, but no one cares about it.

Just design as usual with re-pad. The insert plate thickness is the cone + re-pad. The size of the insert plate will be the OD of the re-pad + 3:1 taper section to the cone. You may want to use square or rectangular insert plate with round corners to ease fabrication.

You don't add pressure thrust (PxA) as axial force to the face of flange unless you have un-tie expansion joint next to the nozzle or in line with the nozzle. When pipe stress engineer doing flexibility analysis, they will add pressure thrust as needed to the piping system and to generate an...

The key point is what "adequate reinforcement" is. If you use COMPRESS, it will apply full area replacement and ends up thicker sleeve or a ridiculous large re-pad for the sleeve. That is incorrect by COMPRESS treating skirt opening as vessel nozzle. Using PV Elite is much better which adopts...

Still, anyone has the experience to advise which services require normalized materials ?

All, it is for carbon steels used in these special services. Codes will not talk about whether to normalize materials for special services. It is all based on experience and testing and many engineering firms or oil companies have their own specific requirements whether normalized CS shall be...

Dear all, Do any of the following services require normalized plates, forging and fitting ? 1. Caustic service 2. Acid service (H2SO4) 3. Lethal service 4. Hydrofluoric (HF) Acid service 5. Any other services require normalization if you know of ? (Wet sour service is yes) I try to put all...

Try LWN or self reinforced nozzle without re-pad.

Muhammad, For 6" N2 re-pad, you have 270+16 weld size > 280 shell length, model error. I changed shell length to 350 and put N2 at the center, the warning disappear. Area for internal pressure is the same as 280 long shell, but different for external pressure. You can try and compare. You...

Dear all, Anyone who has purchased pressure vessel outside of BC Canada and shipped to jobsite in Canada, would you please advise the following : 1. Does the purchase order package (which contains specifications, standards, vessel data sheets or drawings) require PE registered in BC Canada to...

You just get yourself into trouble not using standard flange by many aspects such as custom gasket, bolt size and length, and future maintenance issues. 60" and under, use standard, regardless how small the pressure is. Also need to include equipment pressure from external loads. Check with your...

sisaacs, I just finished one project with several vessels fabricated in China. They did design davit sleeve with bearings at each end for rotation, also furnished a chain hoist at the davit arm, exactly what you are talking about. I can not give you the details, but the bearing is Chinese...

This special davit may need hand calculations for the arm and support clips. See Dennis Moss design manual for guidelines. Also check weld strength and local stress on shell.

There are too many extra mandatory paper works for 2021 edition. You don't need to recertify to 2021, and no way to do that if you read all new added mandatory appendix in 2021. You can not redo all paper works after the fact. I have a project in Columbia, similar to your situation. We found...

Pauletaa, I have purchased hundreds of vessel for the past 30 years, and never ever realized there is such restriction in the code. No vendors or inspectors have ever mentioned this. To weld plate gores together and then form is very common. The typical thin out is from 3-6 mm. Based on this...

Then the head shall be rejected per code. It looks silly, not making sense of the code. says, nominal 35 mm after forming 29 mm of plate and weld. per UG-79(d)(3), smaller of (1mm or 10%x29mm) ----> 1 mm governing The actual reduction is 35-29 = 6 mm , exceeding 1 mm, hence head shall be...

How many of you have really designed a reactor using 1 1/4 Cr-1/2Mo at design tempo 520C or even higher and in service for years ? I did. 20 years of life is the most commonly specified in the industry. The trend is up to 25 years now. Don't understand what is the argument point here for...

Roll it round, and VT/MT/PT check surfaces and welds to ensure no cracks no porosity. If any, just repair. Then hydrotest one more time. If it passes, good to go.

Not making sense all. Material won't tell if it is Div 1 or Div 2. Stress is stress. The allowable stress can be intentionally made lower if code has a concern in Div 2. I faced the same issue in the past for a common low alloy steel that allowed in Div 1 but not in Div. 2.