Thanks for advise.
So far the cracks only be seen outside thw flange, the agenda is we might probably temporary shutdown the Glycol HX for a while in the next few days to have a full inspection, if it has cracks at the internal connection we will have to go for replacement of the flange which...
Good idea, X-ray Fluorescence is a good method to check the flange material if we do not know what is the exact material... thanks!
There are no cracks at other part, but only on the flanges, double confirmed with inspector offshore. X-ray Fluorescence will be a good suggestion to be first...
Just checked with a friend who is an expert in Caesar piping stress analysis, he said it is not necessary to do stress analysis, the stress analysis is not for couplings..
After checking with inspector once again, the cracked flanges are SS304, however the drawing was stated CS...
Nevertheless thank you very much for correcting me Bro Shmulik.
Trying to convince my boss of using the repair clamp right now..
There are no re-routing, just follow exactly the same piping layout, just cut off the corroded section and replace with new one, the joint are connected using swaging fitting instead of welding. The total linework is around 120m and I'm planning to cut and replace around 70~80m of them.
Yes you...
The operating pressure is between 5~10 bar and operating temperature is just around room temp. The reason of hotwork is not allowed because this is an offshore gas platform, we are trying to reduce any possibility of hotwork especially weldings.
There are basically no changes on the...
Hi all,
I am going to change out a section of corroded piping, since hotwork is not allowed thus I will go for "like for like" replacement with same new piping material but fittings component will be using "compression swaging" type fittings. Do I need to do piping stress analysis for this case?
Thanks bro LittleInch.
Bro shmulik, it is not SS304, SS304 definitely not be suitable in offshore.
You had a point just like MJCronin, CI will be the victom for such cracking occured, and yes it is under wet insulation (it is HX). I will have to check with the inspector once again because...
Bro LittleInch,
You are right, when I am asking for warranty, all of them back-off from my request..
May I know what do you mean by cutting a channel in fro the outside to the bolt to create a slot? I am sorry I don't get what you mean...can you please kindly explain in more detail?
There all total of 4 flanges found cracked, the one that I showed in the photo is the most critical. We suspect due to over-torqued, we are actually taking over one of the oldest offshore gas platforms from another operator and there are a lot of rehab required, we don't even know why there are...
I did a lot of this type of connection, especially right now we are constantly upgrading our offshore platform piping system, changing a lot of CS linework which had been there fore 10-20 years to new SS linework, and yes, you should have gaskets in place to do that.
Hi guys,
Managed to get some photo from my inspector from offshore, please see the attached.
Perhaps you guys can take a look and give some suggestion?http://files.engineering.com/getfile.aspx?folder=1911f56a-25b2-4de4-af10-11158b9c35a9&file=cracked_flange.png
The temperature is 45 to 129 deg C, pressure is around 10 psia, fluid media is hydrocarbon gas..flanges are made of carbon steel.
Furmanite is one of my consideration, they do offer repair clamps for flanges, but I just need to make sure if this is a good method. According to our corrosion...
Dear all,
I have a few heat exchanger flanges found cracked possibly due to over-torqued and victim of hydrogen sulfide stress cracking, the operating temperature is between 45 to 129 deg C.
I can't shutdown the line for replacement, is there any ways to temporary repair these flanges and...
according to manufacturer, there will be a layer of epoxy base corrosion inhibitor to be coated on the surface after surface preparation, thickness about 20 mils, after the coating becomes touch dry the carbon fiber can be put on..
hi Edstainless, I am actually considering Carbon Fiber Reinforced Polymer. Had spoken to a few manufacturer, since Carbon Fiber has much stronger strength than normal Fiberglass, I will managed to save some cost here, for example same application I might need 8 layers of fiberglass than 4 layers...
