Hi Mike,
I did provide full details to supplier, rpm vs. time and torque vs. time through the event. The rpm i provided is the motor rpm (high speed side of the gearbox) and torque is the torque required to accelerate the gearbox and motor rotating inertia. Torque is less than 4 Nm, and the...
Hello, the motors are quite strong, we are capable of outputting over 300 Nm. I am not worried about motor torque. Some calculations we have done have the acceleration of the motors very low (<3Nm) but the top speed very high.
I understand that there is a bearing issue, and potentially...
Yes, I do know the armature inertia. When I ran the acceleration calculations, the gearbox was not heavily loaded. This is why I am stating that the case is low torque / high speed.
The gearbox has a 13,000 Nm rating, accelerating the motor is a fraction of this torque load.
I am still waiting on an answer from the supplier. They have been slow to respond.
I was wondering if there are general rules regarding multi-stage helical gearboxes.
The actual case is backdriving where the only load is the motor itself, and acceleration is rather slow, but top speed is high.
Hello all...
Question, I have a 3 stage helical gearbox, ratio 200:1, with 13,000Nm max output torque.
I am trying to determine the maximum, no load, input speed allowable in such a gearbox. Under full load it is rated up to 3000 rpm.
Does anyone have any helpful rules of thumb or guidance I...
Thanks everyone. I will reach out to a few places for the X52 grade and see what I can find.
BTW, if anyone has any rolling around, I'd be interested in purchasing it! :-)
Thanks Again
Hello All,
I need some 28" Pipe w/ 5/8" or 3/4" wall thickness fabricated from a material with min yield of 50ksi or greater.
ASME B31.3 shows many grades which meet the material requirements, but I am not sure if any of them come as seamless 28".
I would relax my requirements to ERW if I...
We also have the ability to alter the area ratios. In the easiest case for us, there is nearly the same areas of the two materials, there would probably be more 6Mo than 625 in the local area. The 6Mo is the vessel material and the 625 is an installed sensor in the vessel nozzle.
Thanks again
Thanks everyone! I totally misspoke, I realize that S31254 is not Duplex. We refer to it as 254 SMO. Sorry about that.
Please keep any comments coming.
Hello,
I've been searching to fine the galvanic reaction between these two materials used in a flowing seawater application. The Duplex will have a very small exposed area and the Inconel will have a rather large exposed area, they are both in close contact with each other.
I have also been...
Thank you for the code references. Those as well as a few others are what I've been referring to. Therefore I believe we are saying the same thing. It's at the discretion of the designer and plant owner as to how to proceed.
Correct?
I work for a company that makes some equipment which replaces a small spool in a piping system and provides measurement data for the process fluid. The item is better analyzed by BPVC VIII Div 1 & 2 vs. B31.3 as you can imagine it is not only pipe and piping components.
Our customers are very...
I am not really a piping designer, hence my mistake with wording. I did not mean a pipeline in terms of traversing large areas. I meant i am installing my component in to piping within a plant which is compliant to B31.3.
Sorry for the confusion. And, thanks for the clarification.
Hello,
I am wondering if areas under B31.3 jurisdiction will allow ASME Section VIII Division 1 vessels or other components in the pipeline with no further analysis on the component beyond that as required by Section VIII.
I know for "unlisted components" B31.3 directs you to ASME Section...
@MJCRONIN. This is a situation where I am working for a manufacturer of specific equipment that will be installed in a B31.3 pipeline. The equipment comprises a pipe with flanges (spool) and various brackets (non penetrating the pipe wall) or nozzles (penetrations). The overall length is...
