Hello all,
Had a question regarding if a code hydrotest is required on a new heat exchanger bundle? With regards to Section VIII, would the requirements be different based on the type of bundle it is? For example, a U-tube bundle that has rolled only tubes would require no welding vs a U-tube...
We have some site requirements that specify tubes in heat exchangers and air coolers be strength welded when tube diameters are greater than or equal to 1 1/2". Speaking with some manufacturers, they don't seem to have an issue with rolling tubes in 1 1/2" or larger tubes. Other than higher risk...
Hello everyone,
Looking to see if anyone has material properties and chemical composition of this material spec? Having a hard time finding it anywhere. I found that it was superseded by ASTM A447 at some point. I have the specification for that material, but the material properties changed a...
@Texas Piper
Thanks for the catalog! All of this info has been very helpful. Really appreciate everyone's time. Looks like per the catalog, it's 170 psig @ 433°F. Interesting that it differs slightly from Little Inch's number and with the values in the other document. I'll most likely go based...
@GD2
We're adding in a new 450# to 150# steam letdown and are looking at sizing a desuperheater. Our 150# steam header is limited by flange rating. To size our desuperheater and understand how much flow we need to cool it off, I was looking to confirm the flange ratings at different pressures...
@1503-44
Thanks very much! This was very informative. The only issue for my current needs is I'm looking to interpolate for an exact value and it's a bit difficult with the graph. Per the graph and reading through the history, it says thru 1968, the press-temp ratings for 150# ratings should...
Hello everyone,
I'm in search of the flange pressure-temperature rating tables for class 150 & 300 flanges in the 1955 B16.5 or B31.3 codes. I wasn't aware tables were in B31.3 in that time, but my pipe spec references both (see attached pic). It would be greatly appreciated if someone could...
Hello everyone,
I have a heat exchanger channel built in 1971 out of SA-357. I'm having a hard time figuring out what material this is online. There is a note on the drawing saying "Material: P-5." Yes, very vague. All of the nozzles are SA-335-P5 & SA-182-f-F5 so I assume it is all 5 Cr...
Hello everyone,
I have a 1970s built reactor with vessel material listed as A-387-B N&T. Is this material equivalent to today's A-387-12?
I appreciate the time in advance!
Edit: To clarify, I ask this because I've seen conflicting responses on different forums between A-387-11 and A-387-12...
We have wedgeplug valves in our FCC slurry and bottoms pumparound systems. There are a few valves that are having issues sealing and have had bonnet leaks in the past. We are evaluating repairing or replacing some of these valves.
I would like to focus on the bottoms pumparound system for this...
Thank you guys greatly for your assistance. It seems as if the equation did not change from the 5th to the 8th edition.
At this point I'm going to assume either the original calculations are incorrect or they took a more conservative approach. Unless editions prior to the 5th had a change and...
Thank you both for your responses.
@Denial: I apologize for putting Figure 17 in my OP as that may have been misleading. All that is referenced from the original calculations was "Per Roark (Table 35)".
The case seems to be for a "circular plate with a concentric hole under uniform radial...
Equation in the original calcs, likely based on the 5th Edition Table 35 Fig. 17:
critical_stress = (KE)/(1-v^2) *(t/a)^3
Equation in the 8th edition, page 747 Table 15.2, case 12a:
critical_stress = (KE)/(1-v^2) *(t/a)^2
So when back solving for t_min @ design stress you're dealing with a...
Hello everyone,
I'm looking at evaluating an increase in max dP of an elephant stool (Outlet collector ring) in a reactor. Evaluating the stiffener ring based on the original calculations from the manufacturer, they reference Roark's Table 35. This reactor was built in 1977 so I'm assuming they...
Thank you all for your responses. I will pull up B31.3, API 530 and API 560 as you all have mentioned to review and reference.
LittleInch - Yes, you are correct in that it is a fired heater. The tubes are 6" in diameter and include 180 deg SR U bends, but the smart pigging vendors we've reached...
Hello everyone,
We will be smart pigging the convection section of a box furnace and we need to take a tube sample (weld to weld). My question is if the tubes within a furnace are considered pipe and designed to B31.3 or designed to the code of the furnace? Additional question, what are box...
