Hi,
Simply put, I have a compressor casing that needs a weld neck flange. Construction is per ASME VIII. THe casing is 410 CA6NM. I was looking thru our company's specs and noticed we don't have any martensitic stainless weld neck flanges called out (I was looking for 410). I start looking...
Hi,
I'm working on my first WPS / PQR and it started me down a path of Codes and Standards. And, as with most things, the more I learn the more I don't know.
I work with a company building Oil Free Screw compressors. Below is what I 'think' is the flow direction of construction standards, is...
Hi,
About 6 months ago, I learned about the possibility of a microbe that uses urea, carbon dioxide, and calcium to create Calcium Carbonate. It's an interesting microbe because it could help to sequester CO2 in the air. Problems of Cradle to Grave carbon cycles probably make it a bad...
Hi all,
I was wondering if anyone in the API compressor world could especially chime in on this, but my question is the following:
What is the experience of using silver, gold, or platinum coating on a 410 shaft? Does it bond well? I haven't started looking at price yet. I'm wondering if it...
Hi all,
I wrote up a question earlier about specifying reduction ratio (or grain size) into a martensitic stainless steel forging spec. I really appreciate the feedback.
Now I have similar forging spec related question on the same material (410 Cond II):
I am reading about fatigue testing...
Hi all,
Is there a forum on this community dealing with carbon capture and sequestration?
This is a huge potential industry and we need it. I'd like to read up on the current engineering problems and solutions.
Thanks and cheers,
Hi all,
I'm asking this question as a rotating equipment OEM: How do I choose the proper reduction ratio for a given material? Should I (as the OEM) even specify this at all?
The current problem we have is a shaft that we forged where the materials lab tells us that the grain size is larger...
Hi,
I'm trying to figure out the best materials for an inlet nozzle on a steam machine. The steam is superheated, but inevitably some liquid condensates.
The current solution is cast iron with a nickel coating. I see other steam machines using 316L, but I'm having a hard time finding repair...
Ladies and gents,
We have a unit that gets a few mils of vibration at 52 Hz (3150 Hz). Multi-stage centrifugal compressor (between brg design). Line freq is 60 hz. Motor speed is 1800 RPM. Running speed = 11,500 RPM. Rotor dynamic study checks out with flying colors.
I'm really wondering...
Ladies and gents,
I'm trying to find some correlation (if any) between the amount the IGV is closed versus vibration of a centrifugal compressor rotor. So far, I'm coming up blank. I have a feeling that as long as 1) the passing frequency is safe and 2) the compressor is not in surge that...
Ladies and gents,
I have a cast iron part that was mis machined. There were thru holes drilled into the part that need to be 'removed'. So we are going to pipe tap the part and install plugs.
My question: What is the best type of material to use for the plugs to create a seal? The plugs...
Hi,
I'm in the API compressor industry (oil and gas). We use NACE MR0175 and MR0103 (deals with H2S cracking), but I was curious if there are any standards for hydrogen embrittlement. I came across a Polyeurthane compressor that has 10% hydrogen in the process. The engineer (many years ago)...
I'm a 32 yr old mechanical engineer (B.S. ME) working in the rotating equipment world. I work for an OEM building compressors for oil and gas / chemical industries. I have worked with aerodynamics, materials, stresses, etc.
I'd like to switch to a different role. A local tech college here...
Hi all,
I'm not sure whether to ask this question here (where I'm hoping all the turbomachinery folks hang out) or in the materials section.
We have a customer who tends to see high vibration on startup. We've been asked to look into an abradable seal, not to correct the start up issue. We...
Hi all,
Reference thread: http://www.eng-tips.com/viewthread.cfm?qid=63814
We have a machine that is eroding in one area of the shaft. The process is mostly ethylene. The erosion caused a radius cut in a step area of the shaft such that material is being taken away in a J shape and the...
Hi,
I really need some help. I have a WPS / PQR that requires a SMAW process defined as the following options (ASME IX Boiler Pressure Code):
Process: SMAW
Spec No (SFA): 5.5
AWS (Class): E-7015 CL2 / E7016-C2L / E8018-C2
F-No: 4
A-No: 10
I'm suspecting our weld engineer isn't so careful and...
I have a A479 CL 2 base material that needs a straight dowel pin installed with standard interference. The first thought I had was to get a 304 pin due to corrosion, but I realized galling may be a problem. Is there any information regarding which stainless steels can be 'mixed' in an...
