KevinNZ,
That is what I intend to do. However, I am looking to understand the code more and understand the process of how the nozzles should be designed. I will collaborate with our contracted Engineering Company but I wanted to do some some preliminary research so I can learn from them as...
Hello All,
My Engineering Firm was just awarded a project to replace (2) existing nozzles with (4) new nozzles that are a size larger on a boiler steam drum. We are contracting out the engineering of the nozzles to a proper PE, and we are doing the piping design that will attach to the...
Ok, so if I compute my stress analysis and my system stresses are under code allowable for the sustained case (G+P) and the expansion case (amb to T1) independently, then my piping system is acceptable? Assuming my system is properly restrained.
NovaStark,
I am designing to B31.3. It just seems odd to me that you account for gravity and pressure for sustained, and temperature change as expansion, but not all 3 together. Especially, since the system will be operating for long periods of time.
I am working on a very hot system...
Can anyone explain to me why temperature change is not considered a sustained load, when the system is operating for a long period of time without shutdown? Or is there an accurate way to consider the full operating case(T1,P1,G) and what method of calculating the allowable would be used?
XL83NL,
Yes materials have already been decided through some discussion with the plant engineers. I have given the manufacturer all the things you listed. This makes me feel better about how I have navigated this part of the design. Thank you for talking through this with me. It is much...
Met11,
Yes this is a large exhaust system that is being re-routed to bypass the exhaust stack and go to a Heat Recovery Steam Generator. The new re-route is about 250' in total length.
XL83NL,
There is not any significant thrust loads, the max pressure this system will see will be 15" WC (~0.5 psig). Also this system is very large, 10'-6" in diameter, so I cannot even find an EJ in a catalog this size to even get a starting point.
Would you agree with the approach I took...
XL83NL,
Thank you for the response, it is very helpful.
I should have clarified something in the beginning. I am dealing with a very large diameter system so I cannot pick an item from a catalog to see if it works. I am working with a manufacturer now and they are asking for movements...
Hello,
I am currently working on a project where I am designing a piping system in need of expansion joints. The system is large and there is no room for expansion loops, so expansion joints is our best option. However my problem begins dealing with the expansion joint manufacturer.
To...
Duct Design Experts,
How do I determine if my circular duct design needs stiffening rings? And, if it does need them, how do I determine the correct member size for the stiffener?
After reading "The Structural Design of Air and Gas Ducts for Power Stations and Industrial Boiler...
Hello,
I am having trouble modeling a boot on a horizontal vessel. I attached the cylindrical section at a nozzle but the vessel has a conical reducer to a nozzle at the the bottom of the boot. Does anyone have any advise on how to model this correctly in Compress?
Thank you.
Marty007,
The nozzle is for an instrument. It is a laser diode. There will be a second nozzle directly across the furnace from this nozzle and it will be used to measure the composition of the gas inside the furnace, if I am not mistaken. I did not realize that the inside of the nozzle could...
racookpe1978,
The Compress software will not let me use a internal temperature of 1368 degrees due to Section VIII. The max temperature allowed is 650 degrees.
Would it be good practice to do a simple heat loss calculation through an insulated wall to determine what the inner and outer wall...
marty007,
That was my thoughts exactly, my manager, a civil engineer, suggested this design. I expressed my concerns about that issue. How would we then add the nozzle to the furnace and eliminate or minimize the thermal conduction traveling thought he nozzle to the furnace wall?
Is there a...
racookpe1978,
What would be the first course of action into designing this nozzle? My manager wanted me to use our Compress Software for BPV but per Section II Part D Subpart 1 the maximum temperature allowed for A-36 is 650 deg F. We want to be able to determine if there needs to be a...
I am trying to design an additional nozzle on an existing furnace and I have a question that my see elementary to some but I would rather ask than continue falsely. I have been reviewing Part UG of the BPVC, specifically UG-37 through UG-45, and most of these sections discuss nozzles on round...
From experience, what are some good materials that have minimum embrittlement and good creep rupture strength during long periods of operation at 1000 deg F? This is for a large diameter duct project.
Also, are there other material properties that I should be concerned with when dealing with...
