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Thank you all for your informative response and confirmation that IP compliance falls under manufacturer self certification. @MintJulep - Do you know if there is any document/article/guidance note/ anything that I could refer to and present internally which would have similar information to...

Naah, As Tmoose pointed, not all steel behave in same way. Without application ifo. it's hard to determinate if selected fit will be best for you but I would say it will not, as shape geometry will play a role when it comes to sliding. Try to Google ISO fits (ISO 286) which should bring you...

Hi, I am new to IP rating and currently I try to establish if there is any standard (or other legal document) that would define testing for production parts with assigned IP rating (in order to make sure that the rating is maintained). I do not think that every enclosure is subject to same IP...

Hi all, I have no solution at this moment but will let you know if I manage to get something. Thank you for all your help and info. Karol

Ok. Thank you for all your answers and inputs. Really appreciated. I did on site testing and went through quite few combinations, tested even a spring loaded version. Unfortunately,non of it get me to finding solution but will try to sort it out. Thanks again. Karol

Hi, Attached it is a simple PI&D with some volume information. The tank volume is 16400 L and it is filled with 15000 L of fresh water as an operating level so we have a bit of volume. Regulator was sized to work around 40-50% of it's flow capacity. Still have no idea why I see this pressure...

I will see how much of the PI&D I can obtain as this is not under my jurisdiction, same applies to obtaining volume info. will need to check with customer. The seat seal is metal against soft material (tried PTFE and PTCFE both gave same results). The first stage regulator is not really...

Thanks for replies and link. Water stop is closed and tank is filled would say 80-90% own capacity (not sure if I answer it fully?) It takes around 50s, initially pressure drops (which is expected), then gradually increases towards set point, fluctuate a bit around it and on similar rate...

Hi all, Not sure if this is the right place for this post but could not find anything closer (feel free to point me into different group if you think there is one). I have recently faced a situation which is beyond my knowledge so I hope having other user view may help with solving it. I work...

Thank you all for your inputs. All literature I can find says more or less, that threaded connection should be avoided if possible, but what if you can not avoid it? :) Will look into flare option defiantly and check NASA publication. Thanks. Karol

Hi all, Was wondering if any of members have past experience with use of aluminium material on hydrogen fuel lines. Basically, I’ve been asked to provide a design for PCV which should regulate pressure from 300bar to 1bar (4350psi to 14.5psi) to feed fuel cells. Additionally PCV should not...

Thank you all for your comments and suggestions. I will make a weld between pipe section and body as a 1/2 V butt weld instead of socket. Karol

Thank you for your all replies. Racookpe1978 My main consideration is weld itself, connection that will be created between pipe and body. Normally with butt weld we will get full material penetration. Weld than can be X ray to check it. I am unsure how to check SW and how ‘big’ the weld should...

Hi, I have read previous posts about socket weld vs. butt weld and I am still in situation for which I am looking to gain extra information. I have to design/select weld connection for pressure regulator body (body + pipe section + flange) on which I will have to use 2 welds on each side. I...

Thank you. I will have a look into it. Yes, it should be 1092-1 my mistake. Karol

I have general question regarding socket welded and neck welded flanges. The company that I work for manufacture pressure regulator and at random occasion we offer flanged connection type instead of threaded connection. So far we have been offer B16.5 flanges in various classes depends on...

Thank you for answering my questions and help. I will keep in mind all those information during design. Karol

Desertfox Thank you for your deep explanation. I will have a look on this site. Based on what you said about thread feature machine on cylindrical tube and lack of material behind it, can I assume that it would be better to go with flange type bonnet and use X amount of bolts instead of using...

Thank you all for your response. So far, on spring loaded application this thread withstand 200 bar below the piston but on slightly different design so this can not be used as a comparison. Anyway thank you for your time and inputs. Desertfox if find time to post more info. I would be highly...

Hi all, Thank you for all yours valuable comments. Desertfox, Thank you for such a quick response. I used 'Machine elements in mechanical design. 4th edition.' - Robert L. Mott, P.E. to crate above calculations (section 18) plus 'Mechanical handbook. 27th edition.' to obtain thread values. We...