Hello Friends, Does it make sense to design a blowdown steam piping that is open to atmosphere for full vacuum? it is in SAGD operation where a 24", ANSI 150 class piping is releasing steam and water at 100 psi and 400F during steam gen blow down events to the pond. Rest of the time it is...
We are planning to weld A106 Gr.B (30.96 mm) to CSA Gr.448 (12.7mm). We will be using transition piece to weld these varying thicknesses. My welding engineer says that when we weld two materials of differing strengths if we choose filler material that matches the TS of weaker of the two that is...
Yes we are sending the samples to the metallurgical lab for further analysis. My point is fracture surface analysis is the best way to go rather than conducting charpy testing. I am trying to identify the best method to analyze the fracture mechanism. I believe post failure charpy testing is not...
Hello Friends, We had a failure (fish mouth) in our piping (106 Gr.B) due to freezing . There are theories that it might have failed due to local overpressure because of water trapped between two ice plugs or the pipe froze 100% and burst. One of the suggestions was to do Charpy Impact on the...
Thanks folks for all the replies. It is above ground plant piping. It was left with full of water after hydrotest.
BigInch, my point is in line with what you said. if we dont observe bulging, the material has not gone past the yield point and it should be good for subsequent service pressure...
Hello Friends, We are dealing with Frozen A106 Gr.B piping due to hydrotest water left inside the line. The plan is to run Go-No Go gauge to determine any bulging and accept if no bulging is observed. The valves will be hydrotested seperately to assess their integrity. Is there anything else we...
Generally when a pipeline is protected by impressed current CP system it is required to disconnect the rectifier before starting any welding on the pipeline. Do we need to disconnect a Mag anode system as well. i believe the voltage and current involved is very low in sacrificial CP system and...
Thanks BigInch, RobinHandy and SNORGY for your replies.
Robinhandy: I will look into 304.7.2 as suggested.
SNORGY: I checked with the supplier and he confirmed it is not dual certified. ASME is stamped on the flange since CSA refers to ASME. So the flange is CSA material spec and ASME...
we have CSA Z662 disposal water pipeline (D.T = 85C and D.P = 5500 kpag) underground and at the wellhead facilities it changes to ASME B31.3 piping. A 2" CL 600 flange on B31.3 piping for temperature tansmitter was found to be CL 600 (PN 100)CSA Gr.359 Cat II and ASME B16.5/CSA 245.12.The flange...
Thanks Steve. You know the construction issues usually end up in the hands of operating integrity folks!!. It seems the coating was not tested before hand. Now field trails are going on with different coating systems. These trails may help us to identify the suitable coating system. in the...
Thanks Metengr and EdStainless. As per my understanding, continuous removal of corrosion products on CS increase the metal loss by FAC. When the Cr content is increased the Cr assists in protective film formation and thus reduce the rate of metal loss. If we do weld overlay by 1.25 Cr material...
In our SAGD facility, vessels in water deoiling unit and water treatment unit are internally coated with Two-Component Epoxy. We are experiencing severe blistering of the coating. Some blisters are 4" in dia. Does anybody dealing any issues like this? Willing to share some knowledge?
Dear Experts,
We have a carbon steel "Tee" joint in steam service experiencing rapid metal loss. We suspect FAC. I did some research on this forum and found P11 or P22 would be a good substitute to reduce the metal loss. Somebody in our group suggesting weld overlay. I am looking for some...
