Recent content by rbel038

We look at the two phase flow regime for the pipe , and design the supports to withstand a slug at the expected pressure and velocity at the support location.

gr2vessels, Probably through my lack of experience with div.2 :D. para 4.15.5.2 in Div.2 gives the options for lugs which i took as being applicable to a support bracket to hold a demister element. This then points to either Part 5 or WRC or another 'analytical method'. If you dont mind me...

Hi All, We are designing our first Div 2 vessel after many Div 1 vessels over the past few years. My question is when it comes to internal support structures for say a demister pad or tower tray how do you approach this? As i understand Div.1 allows you to use generally acceptable rules to...

Im doing a preliminary sizing (my first) of a geothermal fluid collection system from 4 wells to a turbine unit. The design pressure drop is something in the order of 1 - 1.5bar over 2km through the main transmission line. The steam is dry out of the well and im hoping to get some opinion on...

Thanks for the replies. It seems someting like API 579 will be the way to go in regards to assessing the current pipe. Traceability of pipe material will be close to nil, I have some hand drawn isometrics that list API 5LB as the piping material but no documentation to confirm this is the...

Hi, We are tieing into an existing steam header that has been in a plant for the last 20 years and has little to no information about it. I seem to recall that there is a clause somewhere about pressure pipe or equipment that has operated safely in service as being code compliant. Perhaps it...

Thanks for the replys, the API formula finds the maximum mass flux by dividing the integral by 'vt' the specific volume at the throat condition. My first problem was that i thought this was being integrated too... until i opened my eyes and read the formula correctly. I havent gone back to the...

Hi, I want to follow Annex B eqn (B.2) and use a direct integration of the isentropic nozzle formula to work out the max flow through a bursting disc orifice. I understand that the terms come from an isentropic flash at each 'pressure step' through the burst disc but what i dont get is how you...

Hi All, I have a boiler plantroom with a boiler using 18GJ/h of natural gas. What i want to do is work out a diesel equivalent assuming the efficiency of the boiler is unaltered from running on diesel as the burner fuel (its a dual fuel burner). My question. Is this a simple case of just...

Yes something like the pro-sonix injector we are waiting on for some information. Steam hammer / cavitation is what we are worried about and what failure could happen down the track due to this. My thinking is along the same lines as you TD2K its just extra heating taken up by the cold water...

We want to heat between 3~15L/s of water from 10-50°C using direct steam injection of 225°C 14bar.g superheated steam. This is from a site loop off the back of a power plant turbine. My question is what issues if any arise from the steam being superheated when it is injected rather than...

Thanks gr2vessels, in regard to one thing you said , where is this referenced in ASME BPVC? "Nevertheless, the AS 3678 plate may be used in ASME VIII design as equivalent of SA 36, provided it complies with all the limitations of AS 1210 and the allowable stress is in accordance with AS 1210...

Hi, Recently i have noticed that the ASME VIII Div.1 vessels we manufacture use AS3678 plate for non pressure parts (in lieu of SA-36). We also use AS1548 but of course this an accepted material in II Part D. I cant find any reference to AS3678 in part II D , but was wondering if there is a...

Thanks alot guys , taken note of the points raised from everyone here. U-1(e)(1)(c) am i interpretting this rite by saying that the first flange is the one mating to the piping system (the bolted/flanged joint being the tubesheet) at the small end of the reducer. Yes Karloss when you take a...

Hi guys, Since im relatively new to pressure vessel design im struggling with a concept which i wish to gather some opinions/knowledge on. Specifically in the case of heat exchangers where does the vessel end and where does the piping begin? What bought this up is we have a shell and tube...