The trouble with using a surface finish comparator is they only have standard machining finishes like turning and milling.
This finish is such that's its difficult to determine how it was acheived
Regards
Thanks guys..... Firstly YES it's definitely a metal part I'm looking at... 😁.... Secondly, is the surface "finish" all that counts?. I was under the impression that finish had to be achieved using a certain tool that allowed it to bite into the gasket.
Would you accept a brand new valve with...
My question really is does this finish conform to that specified in ASME B16.5 for raised face surface finish.
I know if mentions a certain roughness, but isn't that roughness supposed to be done with a round nosed or 90 degree tool, which this obviously isn't.
Reject or accept?
Cheers
Just after some feedback on this valves raised face......... the black was applied to show up the finish a little better.
My question is simple.
Acceptable or not, and if not... why not?
Cheers
Thanks guys, please see attached photo......
To me that just seems to be non compliant.....Your thoughts?
http://files.engineering.com/getfile.aspx?folder=a7216a20-8f5f-478a-aa9f-638c605b9513&file=DSCN6397.JPG
My question is in relation to the pattern, not the height of groove.
What i'm asking is if the pattern is important or just the surface roughness.
And i don't have a sister :-)
Hi guys, ASME B16.5 mentions that a flange face should have a certain roughness and be spiral or concentrically machined.
We have received some valves that AREN'T spiral or concentrically machined but probably do have the required roughness.
They we machined using a milling machine and to me...
Thanks guys, i started another thread on a different board with the same question.
But then i couldn't find the thread and thats why i asked here.
It seems people really do have different opinions on this and well, we can't all be right can we.
Some seem to think its open, some closed...
well well, it seems i really have found a topic that people are unsure about.
One says open, the other says closed. We can't all be right can we :-)
I'm glad it's not just me that's confused though.
Over to you.........!!
Jeff
Thanks guys,
I'm not sure, but the two replies above seem to give differing opinions.
My question really is, would a bellows psv with a vent pipe be classed as open or closed bonnet?
Thanks
Hi Guys,
We have a few Bellows PSV's landed here in the workshop.
The paperwork says they are a closed bonnet, but the have the vent pipe from the bonnet.
Does that not make them an open bonnet?
Thanks
Hi, i'm really sorry if i wasn't clear, but i was asking about the raised face dimension only. Not a flange to flange dimension.
The problem i am up against is the client needs us to measure the raised face on a great number of pipe flanges and i'm unsure as to whether we should set the spec...
Hi Guys, i have been scratching my head for some time now with regards to the raised face height specs given in ASME B16.5, notable section 7.3 for facings.
It mentions a number of metric sizes and also gives an imperial conversion. EXCEPT, the conversation they give isn't correct.
For instance...
Hi Guys,
I've been asked to source some lint free cloths for oxygen cleaning valve parts.
My usual tool supplier has come back and told me that there isn't anything that is totally lint free.
Anybody any advice or can recommend a product to do the job?
Thanks
Hi Guys,
A client of ours wishes to have us glue test tags to their valves.
Has anyone any recommendations on the type of glue that would suit best.
They will be outdoors in hot sun.
Thanks
Hi Guys, just came across a 16" Class 600 expanding gate valve, and there doesn't appear to be much gramophone face on there at all.
Maybe it was never very deep, i don't know. But the finish on the face is certainly not to the specs i have.
My drawings specify 45 - 50 serrations per inch.
Are...
