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Hi! Is the Pressure Equipment Directive (PED) relevant when designing piping classes, or it's not the case at all (i.e. the piping system that falls under the PED scope designed using a piping class needs to be PED compliant but not the piping class)? I came across a piping class approved by...

Hello everyone, I’m wondering if there are any standardized limitations regarding the minimum spacing between two openings on the circumference of a pipe. For example we have a 6 inch pipe and we want to put one opening at 0° and the other at 90°. Are there any references in ASME, EN, or other...

Hello everyone, I’m seeking your opinion on managing support lift-off scenarios, particularly in systems where there’s a significant difference between "normal" operating temperature (e.g. 60°C) and design temperature (250°C). Here’s the situation which I encounter many times when doing stress...

Hello everyone, I’m currently working on a project that involves several piping lines of various sizes (starting from 2" and upwards) with long vertical segments (up to 10m). These segments are routed towards different types of equipment (heat exchangers, filters, etc.) located on a steel...

Hi! Does anybody know how to determine the minimum yield strength for pipeline materials like e.g. L360 (or API 5L X52) above 60°C. As per EN 1594, above 60°C min. yield strength should be corrected taking the temperature into consideration.

Hi! Does anyone have experience with allowable nozzle loads of tanks made of plastic i.e. polyethylene? I'm trying to find any reference in literature, standards, and norms that could put me on the right track. I need to do a stress analysis for a couple of DN100 stainless steel pipes...

Hi! I have a question regarding the expansion loop design and placement of anchor points. Does it make any sense to place an anchor in the middle of the expansion loop? The conventional way (and the proper way) is to put anchor on both sides of the loop in order to use it´s inherent...

Hi! Short question...does anyone know whether there is a written statement inside EN 13480 (or other EN/DIN norms) norms which excludes which pipes/lines should be hydrotested. Our subcontractor for piping erection claims that small bore pipes i.e. < DN50 don´t have to be pressure tested. Is...

Hi! We have a situation of a dispute with a delivery company about pipes we ordered from them. In the project technical specification, it was clearly specified and underlined that only longitudinally welded pipes are acceptable for use in this project. After we received their offer, we checked...

Hi! Does anyone know if there is a standard which defines the length of bolts for EN flange connections i.e., flanges acc. to EN 1092-1 for welding neck flanges (Typ 11) for PN25? I´m looking for something similar like the ASME B16.5 bolt lengths, but maybe such a thing is not standardized in...

Hi! Has anyone had experience with bolt material 1.7709 / 21CrMoV5-7? Can this material be used at Tmin= -20°C without the additional impact test at Tkv= -20°C or lower temperatures? AS per EN 1515-4, this material can be used at temperatures Tmin >= -10°C.

Hi all! Does anybody of you guys have any experience with installation of rigid hangers on a line which has big thermal displacements and consequently swing angles bigger than > 4° which is accepted worldwide as a industry standard for rigid hangers? We would of course avoid this problem...

Hi! Based on your experience I would like to hear your opinion on this subject – piping supports for stainless steel pipe i.e. the problem of choosing the right material of piping support for stainless steel pipe. My main concern is how to install/make a fix point for stainless steel pipe...

Hi, can you please share your thoughts on the following matter. I came across a piping spec from client for which a minimum design temperature boundary was defined at -10 °C. Accompanying design pressure at this temp. is 41.4 barg. The class is based on ASME standards B31.3, B16.5 etc. The...

Hi, I have a question regarding the selection of weldolets. Which criteria dictates the selection of weldolet schedule i.e. how to decide which schedule to choose out of available schedules STD/XS/160/XXS. Is it defined by the wall thickness of run pipe i.e., if run pipe w.t. is schedule STD...

Hi all, quick question. Is possible to assemble a piping class based on a material according to European norm e.g. 1.4571 in combination with ASME B36.10/B36.19 standards for dimensions, E.g. a pipe with 114.3mm x 4.78mm (STD 30 wall thickness acc. to B36.10) made out of 1.4571 material and not...

Hi! I would like to hear your thoughts/opinions on the subject matter stated in the title. Do you know what is the minimum angle of an elbow for a given NPS of pipe acceptable by the welder/pipe fitter to be used on site? We are currently designing piping route on a sleeper way located on a...

Hi I wonder what it takes to built a good piping support specification like the one I've attached to my post. I mean...where does one start from? Which Code's,Standards, Norms, should one use if we talk about piping systems in refinery. I've seen a dozen of piping support specifications, some...

Hi I'm rather new to world of FEM, that's why I would like to ask someone experienced enough to help me with my problem. I'm trying to run static analysis of pipe support (see attachment) in Solidworks Simulation but I have doubts on how to setup the model, the boundary conditions i.e. fixtures...

Hi I need to calculate (or should i say I'm trying to calculate) pipe wall temperature for steam discharge line of a main steam system in a power plant. A safety valve releases this steam into discharge line in order to protect the system form over-pressure. This event occurs few times a year...