I'm looking at making a design using an acme thread power screw. the basis of the design is a rotary actuator will slowly turn a shaft at 600 in-lb of torque plus also being turned will be an ACME thread power screw which will be compressing some belleville spring washers. the shaft will have...
So i'm trying to model the effect of the RTJ Ring on the RTJ groove. I'm using 100% torque value x 2(for safety) x 8 (number of bolts) = force of ring into joint. I modeled the force down onto the 23.5deg angled surface where the ring was hitting and got a stress. Then I thought the program...
So i've showed the PFI ES-3 standard to a few welding shops and the general comment was "Dude, that kinda tight huh?" Is that a reasonable standard to hold shops to? These shops are welding 2" Cl1500 RFF flanges to valve bodies for us. We have had a couple valves come back from customers with...
The main 4 chemicals that everyone cites for 1018 are all within the specification. But they also list a very large number of other chemicals that when combined equal to less that what those same cites list for Fe, if they list at all. Most just say "Remainder". The cites that do list the...
For "Alignment of facings or ends" it states that they "shall not deviate from the indicated position measured across any diameter more than 3/64" per foot or 1/32 whichever is greater."
My question is does this apply to the raised face section or the OD of the flange. For instance, the raised...
the section states
5.3.3 Secondary Stress
The primary plus secondary stress variation, delta Q, for any sequence of test or operating conditions, shall not
exceed 3Sm·
Is this more than the Pl+Pb for the secondary stress? This seems to say that is Pm + Secondary stress, so... PM + Pl + Pb...
Our company manufactures valves for the oil and gas industry. Our valves usually don't fall into the normal api valve listings as these are throttle valves 5 ksi range using dual orifice discs to control flow (think willis or baker forum or taylor throttle valve). We are gearing up for ISO...
Our company manufactures valves for the oil and gas industry. Our valves usually don't fall into the normal api valve listings as these are throttle valves 5 ksi range using dual orifice discs to control flow (think willis or baker forum or taylor throttle valve). We are gearing up for ISO...
I'm looking for any documents that contain the stress strain curves for ASME A216 WCB. I have the "Atlas of Stress-Strain Curves - Second Edition", and i've looked but i don't see it in there. I could have missed it, like i missed the ketchup bottle in the fridge that was right in front of my...
I'm pretty sure i know the answer but our designs have the bolt open to atmosphere to prevent SSC, however our products are painted after assembly. If the paint covers the bolts and the "open" atmosphere area it probably effectively traps the h2s correct? is there a spot in NACE MR0175 that...
NACE MR0175 calls out specific hardness testing requirements for certain materials. In order to test for hardness, you can't just thump the piece of steel and listen, like testing a watermelon (although technically speaking there are tools that do just that). Is there an approved standard or...
I'm trying to analyze my design that integrates flanges designed to ASME B16.5 dimensions on the inlet and outlet. I've been through the posts on bolts here and there is a lot to take in, but i assumed that asme would have a code with tables listed somewhere. The flanges in b16.5 all have...
Is it possible to design a valve to asme section VIII div 2 and not asme b16.34. Looking at the minimum wall thicknesses of asme b16.34 there doesn't seem to be any regard for material strength, unless there is a factor in the code i'm missing. If i build a valve out of 60ksi min yield material...
I've done the design study for standard temperature. My part has a max psi of 3000 at standard temp. using a material with an allowable stress of 24ksi. Can i extrapolate the max pressure to 300 psi using the listed allowable stress of 21.2? so 21.2/24*3000 giving a max pressure of 2650 psi...
So i just found out our nameplates on our valves are not holding up to the test of time and harsh environments. Is there a specific code that asme calls out for nameplates? This would be for a 5000 psi valve, usually used in the oilfield. Not on the wellhead.
Has anybody used the ASME guided study classes? Specifically the asme section 8 division 2 course. Is it any better than the self study? Is the self study any good? Or should i just plug through the standard hoping i'm reading it right?
Or are there any other well known 3rd parties that offer...
I'm having trouble modeling this in excel so i'm sure i'm not getting the equations right. Most of what i have is all linear for instance force pushing the needle up (see image for reference) I have as P1*A1-P2*A1-P3*A2-k*x where the x is 0-1 and it is correlated to the Cv of the needle and...
I'm looking for literature on the design of needle and seat valves or ball and seat valves, but short of that I'll take a general rule of thumb for flow through an orifice with a centerline obstruction (i.e. like a needle valve). Is there a way to approximate the loss given the open area and...
TLDR: Is there a standard or literature that covers what the limit is on clearance to seal WITH a backup ring.
Okay, so there is tons of literature about o-ring extrusion gap clearances and the durometer needed for each (could be parker did it and everyone copied but its widely published). In...
TLDR: Is there a standard or literature that covers what the limit is on clearance to seal WITH a backup ring.
Okay, so there is tons of literature about o-ring extrusion gap clearances and the durometer needed for each (could be parker did it and everyone copied but its widely published). In...
