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Hello everybody, I work on a gas turbine with magnetic bearings installed in Atex zone. Magnetic bearings are the only one electrical component and it is completely immerged in process gas. I wonder what it the best way for atex certification of the gas turbine assembly: 1) to certify the...

Hello everybody, I work on a machine installed in zone 2 IIC (IECEx), composed of some painted non-electrical components. (supports, baseplate..etc) There is in IEC 80079-36, 60079-0 and 60079-32-1 some requirements about painting thickness and/or surface requirements to prevent static...

Hello everybody, I have a question for an expert of the ATEX certification and associated 2014/34/UE declaration of conformity: If you are a manufacturer of an equipment as a cable gland, a junction box...etc, for installation in ATEX zone in Europe, you have to provide a declaration of...

Hello, Thank you for your feedback, I understand that non-operating cases (short duration, failures..etc) are generally not considered to determine the min and max DESIGN temperatures, therefore the thermal stress analysis is based on DESIGN temperature which are values equal or close to...

Hello everybody, I work on a piping stress analysis and I would like your point of view regarding the couple pressure/temperature to use for a piping stress analysis, especially when sudying effects of thermal growth. I used to consider the expected OPERATING conditions when I study the effects...

Hello everybody, I work on the anti surge protection of a gas centrifugal compressor, where an addionnal check valve is installed directy at the compressor discharge, upstream the recycle loop. (There is also a second check valve dowstream the recycle loop as a typical anti surge configuration)...

Hello everybody, I start the flange calculation acc. to EN1591-1 and I have a doubt about the considered max allowable stress for the bolts. I consider (values given by the software Caesar II): - For installation and hydro-test, the max allowable stress is 485 MPa (100% yield strength) - For...

Hello everybody, I work on a piping system, designed according to ASME B31.3, and I want to install a welded thermowell on a run pipe. Do you know what is required by the B31.3 code for the design in this case? Is there a specific chapter to use, or can I calculate the connection like a "branch...

Hello everybody, I have to supply a vessel with a good level of tightness, raison why I have to calculate all the connections according to EN1591-1, but some of them are used with o-rings or c-rings. I think the EN1591 is not applicable for this type of joints, is it right or it exist maybe an...

Hello everybody, I need clarifications about the chapter 319.4.1 of the ASME B31.3 "formal analysis not required" for piping flexibility analysis. It is written that the equation 16 can be used if the piping system has no more than 2 points of fixations. I don't understand this requirement...

To clarify: This is a turbocompressor without coupling (compressor and turbine casings are bolted together, rotor is monobloc) The length of the turbomachine is between 2 and 4m, and the operating range from -150 to 0°C. The thermal growth, can create a displacement from 3 to 12mm between two...

Hello everybody I work on turbomachines attached through 4 or 8 hold down bolts to a baseplate and working with low temperatures producing casing dilatation and strains (3 to 12mm according to the project) Do you think I need to provide free dilatation systems on the casing holz down bolts (ex...

Hello everybody, I just wonder if there is good practices (standards...etc) to determine the need of cryogenic design on gate/globe/ball manual valves, especially when the "cryogenic" conditions appears only during transient or accidental cases? My project is a piping system with a electrical...

Hello everybody, When designing the flanges of a piping system, we have to consider the (max) design temperature for the rating selection. In somes codes, the max temperature to consider for the flange and the bolts is not exactly the same as the fluid temperature, there is ratios for high...

Hello everybody, I'm searching for documentation about the requirements of dissipativ painting for steel baseplates and steel deck covering in hazardous area (especially the IIC Zone) , to avoid the risk of static electricity build-up and discharge: - Can the static electrity really build-up on...

Hello everybody, I understand that the ASME B31.3 code defines the "cold spring" as a desired pipe initial displacement during pipe assembly/erection. As "desired", I understand that the initial displacement and pre-load is under engineering control (calculated, alignent offset controled..etc)...

Hello, Sorry I will ask the question with different words: According to part 7 and figures 1 to 3 of the ASME B16.5, the flange hub thickness can be thicker than the pipe thickness, and in this case provision shall be taken on the bevel. But, the contrary (pipe th>flange hub th) is not...

Hello everybody, I work on a calculation of a piping system composed of a carbon steel flange and a pipe with important wall thickness reduction: the ratio of 87.5% given by the ASME B31.3 between the flange Weld neck (12.5mm) and the pipe thickness (15mm) is not respected (83%). Individual...

Hello everybody, I work on fatigue phenomenon on steel structures supporting high rotating machinery (10 000 - 30 000 RPM). I used to work with Eurocodes for steel structure design, but I'm not sure that this code is suitable for structures with a large number of cycles, due to the high...

Hello everybody, I work on the code EN 1993-1-10 and I don't find any documentation to let to know how define and calulate the "degree of cold forming (DCF) in percent", and especially in case of a 90° folded sheet. On part 2.3.1 in the code, a correctiv term DTe is corresponding to DT(°C)=...