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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 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 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 All, I have assigned to check the design pressure of a Welded Carbon Steel Pipe (EN 10217-2 Gr P235GH or EN 1.0345) for DN 400 (OD= 406.4mm) line size with a wall thickness of 11mm. The fluid is Saturated Steam at 16 bar(g) ( TSat= 204.345 Deg C). I went through EN 13480 Part -3 and got the...

Hi All, May be this is the wrong forum to post my question, as this is a Pipe Pressure Design question. I am still posting this as I wanted to hear from Chemical Engineer's point of view of quickly calculate the pipe design design pressure given wall thickness and vice versa. It is simple in...

Hi All, I am trying to fix the maximum operating pressure of Steam piping downstream of a Control Valve. The Upstream pressure is 12 bar(g) with saturated steam. The downstream pressure needs to be fixed so that the users in the network get at least 5 bar(g) pressure. I performed a flow model...

Hi All, I have been asked to check the compatibility of Lean Duplex Steel for Industrial water, spec give below. I wanted to know how I can check this. On checking this forum I found that there is Langelier index which tells you if Caco3 will precipitate or not, but then how do you check if...

Hi All, I am tasked to propose and design a Heating system for a Wash Water system. The system I am thinking is as shown in the below copied sketch. I want inputs from you all if there is a better or more efficient solution that mine. My task at this time is to propose a solution, get budgetary...

Hi All, I need some guidance on the need for sizing the Pressure Control valve on the Steam Mains. The Steam Mains is served by two identical boilers each rated for 47000 kg/hr steam capacity at 12 bar(g). The steams mains supplies steam to users at 11 bar(g). It has been proposed to install a...

Hi All, Further to discussion on the below thread, I developed a calculation spreadsheet to perform some sizing calculations for a Pressurized Deaerator. https://www.eng-tips.com/threads/deaerator-sizing.521966/ I am however facing mass balance issues at the Boiler( please see the sketch...

Dear All, I have a process problem that I am trying solve. The Condensate from one side of the plant is sent to Flash Tank, flash steam separated by venting to atmosphere and the LP condensate is pumped to DN 50 (2"NPS) Condensate Header that has Condensate Flash Steam. The question is will...

Hi All, I have to size a PSV located on the N2 buffer tank. The N2 buffer tank receives N2 from Air Separation plant at 19 bar(g). The vessel operates at 19 bar(g) at 34 Deg C. The vessel is designed per PED 2014/68/EU with a Design pressure of 25 bar(g) at 34 Deg C. The maximum pressure that...

Pavan Kumar (Chemical)(OP)3 Oct 24 20:26 Hi All, I am writing a report to share Knowledge about Design and Operation of Deaerators. I have gone through some very insightful threads in this forum on this topic such as the one shown below. I know there are two types of Deaerators (i) Spray Type...

Hi All, I am writing a report to share Knowledge about Design and Operation of Deaerators. I have gone through some very insightful threads in this forum on this topic such as the one shown below. I know there are two types of Deaerators (i) Spray Type (ii) Tray Type...

Hi All, I am trying to size a Deaerator for two electric boilers that we will be installed for a client. Can anyone provide me the references or documents that I can use to learn about Pressurized Deaerator sizing. I am looking for the basis for the following calculations: 1. Air venting...

Hi All, Can anyone provide me the references or documents that I can use to learn about Pressurized Deaerator sizing. Any help is appreciated. Thanks and Regards, Pavan Kumar

Hi All, I am tasked to size the overflow line from tank. The line, that is supposed to be sized, comes out from the side outlet has a near horizontal run of 14 ft before it turns 90 degree down and travels 15 ft down and then turns horizontal ( 12 ft run) and connects to main header which is...

Hi All, I am sizing an expansion tank for Hot Glycol re-circulation loop. The temperature of the Glycol ( 40% Ethylene Glycol in water) increases from 55 to 60 Deg C across a gas fired heater. The hot glycol transfers heat across an Pipe-in-Pipe Heat exchanger to heat the process fluid inside...

Hi All, I am sizing a pump for 93% sulfuric acid service. From Narfalco Sulfuric Acid handbook I got the density, viscosity a 15 Deg C (pumping temperature) as 1.8331 gm/cm3 and 25 cP. The vapor pressure is 0.3 mm of Hg at 15 Deg C. The flow is 0.5 gpm with 1/2" Sch 80 line size. The flow is...