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Thank You. AFAIK the % back pressure ( superimposed + built-up ) is equal to the % overpressure.

Thank you very much Obturator. I will use 10% overpressure and refer to the EN12953-6 and 8 as you mentioned above. Also 10% overpressure means 10% back pressure is allowed correct?. Thank you very much again. Thanks and Regards, Pavan Kumar

ARMATUREN ARI-SAFE 25912

Hi Obturator, Thanks and Regards, Pavan Kumar

Hi Obturator, ASME Sec I -2019 Edn Pg 67 says that it allows an overpressure of 6%. I have heard 3% all along but the Code Says 6%. So the 6% is correct even for a single PSV installation correct?. Yes the PSV is installed in Sweden in EU. Thanks and Regards, Pavan Kumar

HI LI, This is not repeat post but a question related to the same boiler. This time it is PSV hence posted here. Thanks and Regards, Pavan Kumar

Hi Obturator, I apologize for not paying much attention to your earlier. I will make sure not to let this happen again. I am, asking this overpressure question as we need to calculate the back pressure of a Boiler PSV which has short bend and vent piping installed on it. I need to calculate...

Hi All, I wanted to know the allowable overpressure for Electric Steam Boilers per ISO-4126. ASME Sec I allows a maximum overpressure of 6% of PSV Set pressure. I wanted to know what is per EN 12953, the boiler standard in Sweden. Thanks ad Regards, Pavan Kumar

Hi LI, "When I want to order a pipe then I specify the pipe size and this minimum thickness (e). " I should have said the Pipe size and pipe thickness (=e+Co+C1+C2). Yes I specified pipe before but using ASME B31.1 and 31.3. The concept is same in EN-13480. Thanks and Regards, Pavan Kumar

Hi LI, I am working the other way round. I know the actual pipe thickness and I am calculating the design pressure for this thickness. Actual pipe wall thickness which is 11 mm and I assuming that this thickness includes Co, C1 and C2. After substracting these I am left with a minimum...

HI LI, I considered the 1mm as the additional thickness that EN 13480-3 talks about. If I do not consider that the pipe design pressure will be even higher. Regarding the 1/16" corrosion allowance. This value is typical for corrosion allowance for pipes. For the calculations in EN 13480-3 the...

Hi Hubert, Thank you for your reply. I will try and get hold of EN 13480-Part 3 2024 Edn. 1. I used equation for 5.2.1-1 which is for Steels other than Austenitic steels. My pipe material is Carbon Steel (EN 10217-2 Grade P235GH (EN 1.0345)), so I considered it to be Non-Austenitic Steel as...

Doesn't the gasket pressure and temperature rating depend on the Gasket material and thickness?. The gasket spec is mentioned in our pipe spec for suitable for PN25 flanges. Does this mean it has the same rating of PN 25 flanges ( EN 1.0460) at 205 Deg C, which is 19 bar(g). Thanks and Regards...

Hi All, I want to determine the pressure rating of a PN 25 spiral wound gasket built to EN-1514-2. The gasket is 3 mm thick with X5CrNi18 Stainless Steel Inner ring, outer ring with flexible graphite filler. I have never checked gasket ratings before and some elaborate guidance. Thanks and...

Hi Obturator, Is there a limitation imposed by the Boiler Code of Construction, in this Case EN -12953-1. ASME Sec I for Power boilers just says the back pressure is limited to the extent that will start reducing the PSV capacity. So it looks it is up to the PSV Type and Manufacturer. Is ASME...

Hi All, We have a Electric Boiler with a PSV on it. The design code for the Boiler says EN 12953 / EN 13445 and EN 61936-1 / EN61439 - 1&2. Now I see EN 12953 is a code for the Boiler. Is this is similar to ASME Sec I?. This being an electric boiler should it be considered as un-fired pressure...

Hi All, I am asked to calculate the Back Pressure on a PSV installed on Electric Boiler. The PSV is sized per ISO-4126 Part 7. I understood the back pressure in the discharge line is as per ISO-4216 Part 9. I do not have access to this standard, I wanted to know from you if you know what is...

Hi GD2, I am a chemical engineer and so I have not dealt with terms like Creep before. However, I will put time to understand it and work through the problems. Thanks and Regards, Pavan Kumar

HI GD2, I am not well versed with terms like Creep and mechanical properties of materials and want to know how you established the Creep range for EN 10217-2 P235GH material as 343-371 Deg C?. If the Creep stress can be neglected and then could you go through my calculations and let me know if...

Hi Li, My calculations has a lot of assumptions and I could not locate Creep Stress value. So my answer is to be confirmed. I contacted Hubert(XL83NL) on Linkedin and he said he will get back end of this week. Thanks and Regards, Pavan Kumar