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Hello, STOPAQ PVC outerwrap is being considered for aeging underground CS piping which is protected by an impressed current CP system. The current drain test was performed on the piping and the required current for protection has been determined. Will the PVC wrap result in CP current...

Hello, Stopaq PVC outerwrap has been considered for underground CS piping which is to be cathodically protected. Will the PVC wrapping result in CP current shielding? Thanks,

I would also like to add that I have considered the option of replacing the impressed current distributed close system of MMO canister anodes with MMO ribbon anode but the deterring factor is the very large scope of UG piping which is around 2 kilometers in length in total and I was thrown off...

Hello all, A requirement has been raised in the operating company I work at for impressed current cathodic protection of buried carbon steel piping which has begun to corrode rapidly in recent years. The FEED study has been awarded to an EPC contractor for proposing the most suitable impressed...

TVP, thank you for your input, however, I have not specified that the stainless steel is used for seawater or produced water applications, in which case 60 degC would be too high even for SDSS. I would like to confirm whether SS used in non corrosive service may be susceptible to atmospheric...

There are numerous types of phenolic epoxy coatings. Search for PPG's interactive catalogue online and read about the temperature limitations.

The grade was not specified. Lets assume the two most common grades in this case, 304 and 316. Thanks

You can use phenolic epoxy coating. It withstands temperatures nearing 200 degC. I have specified it for the external surface of liquid sulphur tank bottom plates where the operating temperture is 140 degC.

Hello all, I work in an operating company in which I came across the below criteria for stainless steel: Stainless steel may be used in offshore applications up to an operating temperature of 60 degC. As per my understanding, the above temperature limitation governs in case of sour service...

Thank you Steve for the very informative response.

I understand what upset conditions are, however, I wanted clarity on what upset conditions are applicable to instrument air service. I asked earlier if there a probable risk of onset of galvanic corrosion due to moisture intrusion. Would corrosion be exacerbated by the attack of zinc from the...

Thanks Tom, There is no clear requirement apparently and thus we arent payed for it (we would have done it if the client payed for it). This was listed as a punch point and as you are aware we try discourage the client from making unjustified demands here and there. What do you mean by upset...

Hello, Our Client has asked for an insulation gasket where we have dissimilar material for the piping flange connection. In our case the flange connection is between SS instrument flange and galvanized pipe, while as per our drawings we have a graphite gasket. Is it required to provide...

Hi, The following parameters are required in order to determine the current requirement: - Type of coating of the storage tank bottom - Operating temperature of the tank - Surface area of the tank - A factor included in the surface area accounting for the surface area of the welds between the...

Hello, A Client has asked for solutions to a corrosion problem they are having on an injection pump. Below are the process parameters: - Operating temperature is 54 degC - Sour water service - Chloride levels are in the 1000ppm order (definitely below 100,000pm) but not known exactly - MOC of...

Hello all, A valve vendor has offered body material A350 LF2 instead of A216 WCB for 16” ball valves. The operating conditions are as follows: a. Sour HC condensate b. operating temperature is approximately 50 degC c. MDMT is -29 degC d. 3 phase fluid state I am aware that repeating queries...

Hello all, I am designing a simple sacrificial anode cathodic protection system for a Gulf client. The protected structure is a 6", 27 m buried carbon steel in plant piping coated with liquid epoxy (pipe temperature doesn't exceed 40 degC). I have specified Mg anodes and fink test posts with...

Thank you all for your feedback. Steve: thanks for shedding light on the issue of galvanic corrosion in this application. Would you therefore suggest coating the galvanized 4140 bolts as a preventive measure against galvanic corrosion? cloa and CoryPad: I have forgot to mention that coating...

Hello all, We have 4140 bolts on a SDSS pump casing on an offshore installation. A concern was raised regarding the possibility of galvanic corrosion occurring between the bolts and casing due to the high humidity and marine environment. My understanding is that galvanic corrosion initiates...

Appreciate your feedback. I consulted NACE Technical Committee Report 8X194, which states that the intent of the report is to minimize susceptibility of carbon steel to various forms of corrosion (including HIC) under sour service and within a temperature range of 0-150 degC. This renders the...