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Thanks all for input which gave me confidence in my understanding... The software I am using is CAESAR II. It allows me to crate own soil stiffness. I am using American Lifeline Aliance method to generate soil spring stiffness. The thumb rule of SMYS / 6 seems to working ... The pipeline...

ASME B31.8 has clear definition provided in Para 833.1 as 1. Piping in which soil or supports prevent axial displacement of flexure at bend in "Restrained" which can have straight section of buried piping or bends /pipe in stiff soil. 2. Piping that is freed to displace axially or flex at bends...

thanks all, Is it an acceptable approach that we make separate models like: 1. Pig Trap to little further ofvirtual anchor 2. model for each bend with pipe modelled till virtual anchor length on either side of bends? Means we need not model a continuous 10 km long model. Software takes time to...

My experience says that the buried pipe should be modelled till virtual anchor lenght in a software... some times we model twice of the virtual anchor length. Virtual anchor length can be calculatd by hand calculations. However client is asking us to model 10 km long pipeline in CAESAR II. When...

Thanks LSThill ... good papers you have shared . thanks others too for inputs. Actually Surge analysis is carried out by process engineer and i as a piping engineer challenging the software results. hence needed 3rd party opinion.

Thanks All for your inputs. I have mentioned the Force of 200 Tonnes and Not the Surge Pressure (obviously it should be in bar, kPa etc.). The Pimp has NRV. However my questions are: 1. Software gives same answer of surge pressure irrespective of Valve closure time i.e even if valve closure is...

Problem:A pipe is connected to pump creating 13 bar pressure (shut off pressure 17 bar) has ESD valve at 3.5km distance.Flow velocity is 6 ft/sec. Valve closure Time is 4.5 seconds. The Pipe size is 28 inch. As per Joukowsky equation the surge force comes out to be above 200Tonnes. The above...