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I am new to understanding the CGA code. I see that it provides 2 flow requirements. When selecting a relief valve, which requirement needs to be met? It was my understanding that the reclosing relief device, aka pressure relief valve, needs to only meet the system's primary flow requirement...

I am new to understanding the CGA code. I see that it provides 2 flow requirements. When selecting a relief valve, which requirement needs to be met? It was my understanding that the reclosing relief device, aka pressure relief valve, needs to only meet the system's primary flow requirement...

I am new to understanding the CGA code. I see that it provides 2 flow requirements. When selecting a relief valve, which requirement needs to be met? It was my understanding that the reclosing relief device, aka pressure relief valve, needs to only meet the system's primary flow requirement...

Okay, but then why is a reducer allowed and an expander is not?

Appendix M-6 of the pressure vessel code states that the pipe connection to the relief valve should be at least as large as the relief valve inlet. What's the reason for this? Is it potentially dangerous to connect relief valves via expanders? Why is it okay to install it with a reducer? Thanks!

We have a pipe that's shaped like a vessel. Our supplier is saying its an inline piping component (basically just a bogger pipe). Does any one know what distinguishes a pressure vessel from a pipe?

Hi, Code says 5% of all welds must be x-rayed but it looks like its for normal service. My fluid service is liquid nitrogen, does anyone know how to determine the required x-ray %? Thanks

Hi, I'm new to learning about how LN2 tanks work. Any information or resources will be greatly appreciated. I am particularly looking to understand how the delivery pressure works and if the LN2 and GN2 pressures are always the same. Thanks!

I need to perform flow calculations for the regulator failure scenario. Typically we have the Cv valve and the calculations are fairly simple. But in this case, I only have the regulator orifice size, does anyone know how to do flow calculations with just the orifice size?

Hi, Yes the cylinder would have GN2 at 150 to keep the refrigerant pressurized. In that case, if the temperature is increased, is my assessment correct?

Hi, I apologize in advance for asking such a basic question here. I haven't referenced this in a while... Lets suppose I have R134a in a container at 150 psig at room temperature. If I were to increase the temperature to 100 F, would my new pressure then be 150 +123.58 psig? The table I'm...

Thank you for your responses! I was referring to Basic Allowable Stresses in Table A-1. I know the basic allowable stresses are lesser of the 1/3* tensile strength or 2/3 * yield strength. I was just wondering if the listed tensile strength itself had any safety factor involved?

Hi, Does anyone know if there is a safety factor involved in the tensile strengths in ASME B31.3? Thank you!

Thank you everyone, all the responses were very helpful! Installing a needle valve upstream is a good idea, I will look into that.

Thank you for your inputs, here is some clarification: The regulator will be attached to a DOT cylinder to supply Argon gas to the welder. There is no pressure control from the cylinder, the regulator is rated for max inlet of 3000 psig and the supply pressure from the cylinder is below that...

Here is the regulator information: https://store.cyberweld.com/smduflre30se.html Most regulators have this information readily available, I was just wondering if anyone else came across something like this.

Thank you for your response @georgeverghese. So we use the Cv value and pressure upstream of the regulator for our calculations. But the flowmeter regulators that I have come across don't typically come with the CV value information. I am wondering if its because they come with a preset...

Generally we use Cv value of the regulator to size the relief valves. But not sure how to size relief valves for flow meter regulators since it comes with a preset pressure. Any help on difference between a flowmeter regulator and a standard pressure regulator would be very helpful. Is Cv value...

Thank you, that was helpful!

Hi Guys, I am looking into designing a small vacuum vessel less than 6" ID and 20" length. I am thinking of designing it per ASME Section VIII UG-28 guidelines. Has any one had experience doing this? Would you still recommend performing buckling analysis if its designed per code? Any guideline...