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Hi Gerhardl, Thanks for your inputs. Appreciated. Best regards, Habiby

Hi ax1e. Thanks for the inputs. Appreciated. Best regards, Habiby

Hi All, Hope all are well and safe. I am seeking inputs from colleagues on the frequency of Inline Inspection (ILI) runs for transmissions pipelines. Currently we have a time-based frequency of 5-years for each technology such as (i) MFL, (ii) Crack, (iii), IMU and (iv) Caliper. We are...

Hi Metengr, The tubes are formed in hot state. Would appreciate if you could share what are the specific reasons that SA 234- WPC are preferred choice for u-bend compared to SA 106 grade C. They both have similar composition and in application where tube metal temperature is not above 400C...

Thanks Metengr. The SA 106 Gr C, a possible alternative to SA234 WPC U-bend, is also to be welded to the tubes which are of SA 106 too. Do you see any concern using SA 106 Gr C instead of SA 234 WPC for U-bend application. Thanks.

We are evaluating the use of SA 106 Gr C in place of SA 234 WPC for a boilers U-bend application. The SA 234 WPC and SA 106 Gr C have almost identical chemical composition and often used in u-bends for boilers also. In our case, as per the original design application, the boiler tubes are of SA...

Thanks Cory. It cleared a great doubt. MetCorr

In technical literature, one often reads a pharse such as: ' Material A can be used in this environment compared to Material B for any given pressure and temperature'. It seems to me at least confusing at time. Does the above statement means that: 1: 'Material A can be used in a particular...

Naptha or crude is not a good electrolyte and hence galvanci corrosion may not be a concern. Again, in my opinion, Titanium will quickly polarized and lead to further minimization of galvanic attack on iron if at all a risk is there. Hence, carbon steel tubes can be safely connected with...

As Rich-2000 has reported as: 'The Zinc- Stainless cracking as gr2vessels mentioned is called " Solid Metal Embrittlement" Should that not be called as ' Liquid Metal Embrittlement' instead? MetCorr

Thanks Abcmex and Gerhard for your comments. We are also looking for Non-metallic PSV which are normaly installed on HCL Rail Cars and approved by appropriate code for rail cars only. But, these PSVs are not approved by API or ASTM. Just wondering if we can use them in process plants on HCL...

At one of our plants, we have a HCL transmission line of about 2 inches. The line handles HCL at 35% concentrations and at about 50C temperature that can reach in summer season. A PSV was originally installed of Stainless Steel 316 which has history of leakage. While reviewing plant data, we now...

Thanks SnTMan for your suggestion regarding changing the gasket type. We will look into the corrugated metal type gasket also. MetCorr

Thanks for advice by colleagues. As gr2vessels has suggested, we will look for desing calculations. Also, a closer look at the gasket has revealed that in fact, the gasket does have signs of localized damages. Following may please be noted as asked by unclesyd. 1. This gasket is origional...

We will appreciate views and advice from colleagues on a problem being faced by us at one of our plants. The description is as follows: In a heat-exchanger, we have a stainless steel jacketted gasket of graphite. The temperature of the heat exchanger swings between 250-300C at a frequency of...

1. As Corypad has said, you have a potential galvanic cell. The common electrolyte is possible through rain or moisture. However, it may not be much of a concern if rain is occasional. Regards, MetCorr

Thanks btrueblood. Just as an added information, the pipeline is for Middle East location.

Thanks MintJulep. The manufacturere of FRP says their product is approved for potable water service. What type of check we should make to convince ourselves the product has no health hazards.

As part of our engineering design specification, we will be using FRP pipe for the underground drinking water utilities. Can some one guide us if there are any health related hazards in using FPR in drinking water service as undergroung pipeline.

In general when duplex stainless steel is mentioned, it is understood that it will have a 50:50 ratio of austenite and ferrite. The welknown 2205 is an example. But, for sake of definition, does duplex stainless steel can also have 20:80 or 30:70 ratio of austenite and ferrite or ratios other...