I found a couple old threads on this topic:
thread820-140933
thread407-23283
Neither seemed to answer the question regarding what GD2 vs. WR2 mean.
The best answer I have found is that GD2 is what mass moment of inertia is called in SI units and it would typically have units of kg*m^2. WR2...
Is there any validity in the assumption that having a tapped hole with more thread engagement is a better fastener than a through hole with a bolt and a single nut of thread engagement?
The bolt is M20 and the load is a static 15 kN with a dynamic +/- 3 kN. Sorry, my tool is in SI units. So your 3/4" estimate through 1" plate is a good estimate. We usually use a 2" minimum plate and drill and tap through that.
I was wondering more about the method of fastening, though. I...
Thanks for the response. My particular application is the following:
I am mounting a centrifugal compressor to a baseplate which we are designing. On the baseplate design, I have to weld a mounting pad (1" thick plate) to the top of an I-beam. This plate will be machined flat.
To minimize...
I have two pieces of carbon steel A36 plate that were welded together to make a thicker plate. Is it acceptable to tap a hole through both of them at the same time to get the bolt thread engagement I need? Or should I replace with a single thicker piece of plate? Any concerns about corrosion...
I did some follow up after reading this post. I think there is some confusion on the terminology used. I will attempt to clarify below.
1. Buffer gas or separation gas is for the barrier seal portion of the DGS. This separates the lube oil from the secondary seal chamber on a tandem...
What is the best method for mounting centrifugal compressor feet to the baseplate supports?
1. Bolt threaded directly into threaded hole on the baseplate.
2. Through bolt with nut and washer on the bottom.
The compressors I have seen use the bolt threaded directly into the baseplate...
API 661 does not mention any specific flushing/cleanliness criteria for air-cooled heat exchangers, in this case a compressor aftercooler. The only criteria it has is for the cooler to be "free of foreign matter."
I understand that if the client has a specific cleanliness for their gas, that...
-Design pressure = 1885 psi
-Corrosion allowance = None
-Material = A105/A106
-Design code = B31.3
So it appears that SCH80 is technically acceptable. However, the SCH80 per B31.3 does not match the rating of the CL900 flanges per B16.5. Very enlightening--thanks for all the input!
I noticed...
Rneil/Dcasto--great catch. I checked the spec and the flange is actually 18"SCH80. The calcs per B31.3 indicate that SCH80 satisfies CL900. If this isn't right, please let me know. Thanks.
Another thought: The black paint does protect the carbon from some corrosion. If we did need to strip this off, would it be better to instruct the site to do this on prep of the flanges for installation? We could do it at the factory but that would leave the groove vulnerable to corrosion.
It appears to be just black flange paint which was rather sloppily applied to the flange. Looks like they dipped it quickly and thats it. I can get the spec on the paint but I doubt it is anything special.
A carbon steel 18"SCH40 900# orifice flange that we procured arrived coated with black paint. I am concerned that the coating will interfere with the RTJ groove on the flange. Is this a problem? Also, the inside of the flange will be exposed in the pipeline. Should I be concerned about...
PeterIgg: The solution that was taken by the valve supplier was to bore a small hole in the fitting on the inlet side of the actuator. In answer to your question about speeds, the fittings in the exit line from the actuator were bored larger to allow more airflow and thus faster closing speed...
Thanks for the input, PeterIgg.
On this particular valve we require a closing time of <100ms. The air assist is not for the valve to function but rather for it to meet this quick close requirement. Adding a pressure vessel as you said does not seem to me the best option since this is a...
