Customer of mine is wanting me to confirm that a hydraulic fitting I am selling him will withstand 800F. The fitting is a standard issue hydraulic fitting (#12 BPP Female Coupling) that will be welded to 6" SHD 80 pipe. The pipe is on the exhaust side of a diesel engine onboard a cruise ship. No real pressure to speak of because it's venting to atmosphere. I haven't had much luck finding a clear cut answer. Since i'm in bearings and PT now I don't have the same contacts I use to. Any ideas?
Q_Goest
Jun16-08, 03:53 PM
I've never heard of a #12 BPP, but if this is a US application, the stress allowables for the material from ASME B31.3 at the given temperature apply unless there's a specification for the fitting such as an MSS spec. Note that pressure on a vent header is just one consideration. Bending moments imposed by the venting of fluid are another consideration, so simply saying there's no pressure load is misleading.
In Europe, there's an equivalent pressure code, but I'm not familiar with it.
If this is US, provide the ASTM material spec, grade and temper and I can see what the code gives for stress allowable.
Once you have that, you can either do calculations on the wall thickness (you'll need to post a drawing) or you can derate the component by using the stress allowable at temperature divided by stress allowable at ambient times the pressure rating at ambient (assuming you have a pressure rating at ambient).
FredGarvin
Jun16-08, 03:53 PM
I am use to MS and Parker fittings. Is there an equivalent Parker part number you can throw out? By your description, it sounds like a pipe coupling similar to this:
I am use to MS and Parker fittings. Is there an equivalent Parker part number you can throw out? By your description, it sounds like a pipe coupling similar to this:
Yep, 3/4 Brittish Pipe E/E. Will have to look up the Parker number, I don't remember any of the nomenclature for anything other than pipe, JIC, or OFS.
Ronnin
Jun16-08, 04:48 PM
I've never heard of a #12 BPP, but if this is a US application, the stress allowables for the material from ASME B31.3 at the given temperature apply unless there's a specification for the fitting such as an MSS spec. Note that pressure on a vent header is just one consideration. Bending moments imposed by the venting of fluid are another consideration, so simply saying there's no pressure load is misleading.
In Europe, there's an equivalent pressure code, but I'm not familiar with it.
If this is US, provide the ASTM material spec, grade and temper and I can see what the code gives for stress allowable.
Once you have that, you can either do calculations on the wall thickness (you'll need to post a drawing) or you can derate the component by using the stress allowable at temperature divided by stress allowable at ambient times the pressure rating at ambient (assuming you have a pressure rating at ambient).
I'll try to find an available drawing and post, but most of the informaiton out of the cats won't have anything besides the configuration of the adapter. I knew I should of just told this customer I don't handle anything fluid power anymore. Me and my award winning customer service.:tongue: