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You should treat B31.8 831.4.2(c) and 831.4.2(j)(3) separately for understanding. Whereas 831.4.2(c) talks about a complete encirclement reinforcement type that we encounter in daily life, 831.4.2(j)(3) talks about hot tapping/plugging fittings, where the reinforcing sleeve is pressurised and is...

I will be a bit skeptical on the 1200C. What is that process that uses 1200C? Furnace heater tubes goes upto 900C and the high temperature nuclear reactor cores made of graphite materials. Typically Ni-Fe-Cr alloys can see the max temperature. If you are talking about Pyrolysis process, users...

Sorry, I am not used to EN standard. I am an ASME guy. I can’t therefore validate your strength numbers. As for creep, it is when the material time-dependent properties kicks-in. Examples are heater tubes where the tubes has to be designed for both elastic and rupture (creep). If you haven’t...

Why do you even have to do the time-dependent evaluation? CS @204 C will never cross to the creep regime. Temperature limit to define the creep range for EN 10217-2 Gr P235GH material will be 343C-371C depending on the reported tensile strength.

There is no standard available. You have to make one for your company or the project. Process vent should be a proper vent assembly with valves that will be used for the life cycle of the plant during start up, shutdown, maintenance etc. It should be based on the piping class. Different vent...

If I am reading/interpreting B16.5 P8.2.2 correctly, CL150 reads 20 bar (290 PSI) at 38C X1.5 =30 bar (435PSI) max flange pressure. Or would it be 21 bar? The test pressure would be 450 psig rounding off to next higher 25 psig. It's the max test pressure. However, note that you won't be only...

You don't have to break your head. Instead you need to read ASME B16.5 Para 8. Flange test pressure is 1.5x the pressure rating (MAWP) at 38C given in Tables 2-1.1 or Table II-2-1.1 rounded off to next higher 1 bar or 25 psi.

What's your pump make and model?

You are right. For t<D/6, the Lame's equation for thickness calculation becomes overly conservative. The stress across the wall thickness is no more assumed as membrane (equal) and varies across the wall. That's where the base code and high pressure fluid system Chapter IX kicks in. If you...

Grid option is preferable for both because if the PTR produces COV >10%, grid is required anyway.

Why do you say the nozzle has to be from a pipe? As long as it meets the acceptable material by the Code, it can be fabricated by other methods too.

How about the possibility of a clamp over the coupling, injecting with sealant, with tapping to a surface vault to monitor the joint pressure and inject with fresh sealant when required.

Looks like 110 psi discharge pressure meets your system requirement. Look for a pump with TDH 114 psi (as Katmar had said) and 200 GPM near to the Best Efficiency Point (BEP) on the pump Characteristics curve (H-Q Curve). if you are little skeptical, you can increase to say 120 psi (you can...

The Safety valve is set at 290 Barg which is equal to the MAWP or Design Pressure of the Pump. Pump manufacturer has set it based on the design of the pump. For the piping, you need to first determine what should be the design pressure. This will be based on the MOP you need. If the PRV had...

Typically Max Operating Temperature will be 240C ( a 10C margin with Design temp). Will it make any difference to your stress result? If you have overhead space, a long rigid spring hanger instead of variable might work.

It will be incomplete to comment without the process in play. The process will typically decide on the material selection like Krausen said. Once the material is selected, you see whether it can be resourced easily and local fabrication expertise is available. If not, you go the next material in...

Other things to look at: Perform major reviews of the pipeline’s condition and history, including: • Laterals and connections • Piggability and line cleanliness • Right-of-way conditions • Existing threats, such as corrosion or mechanical damage • Potential threats, such as fatigue •...

Thuba, check once again. It doesn't look like an outlet line. It should be an inlet line.

You are right. Lets make it simple to understand by OP. We can find the design pressure for the selected pipe: ASTM A671-CC65 CL.22, 24" x STD. Assume Location 1 Division. F=0.80, S = 34,800 psi, E=1.00, T=1.00, D = 24", t=0.375" P=2St/D (FET) = [2 (34,800)(0.375)/24](0.80 x 1.00 x 1.00) = 870...

It looks to me you have missed a lot. Which Code allows you to do a hydrotest beyond the Yield Strength? The SMYS of the ASTM A671-CC65 CL.22 is same as ASTM A106 Gr. B pipes. How many times we have tested these pipes? All over the place. Follow the Code rules for the hydrostatic/pneumatic...