My knowledge only applies to piping designed per ASME B31.1 and B31.3, and thermowells designed per ASME PTC 19.3-TW.
Q1: In our industry, we will either
A) increase the pipe size to 4", then install a thermowell with 2.5" insertion, and then decrease the pipe back to its original size, or
B)...
Hi All,
My department is going through some spec reviews and something brought up a discussion about our horizontal Drum level tap locations and how we arrived at the standards that we have now.
For reference, we set a standard that the upper level tap shall be 4" above HHWL and the lower tap...
Dan,
Thanks for your input. My department has been trying pretty hard lately to get our issues straightened out. There were three projects that had utilized incorrect information. Frankly, our domestic projects don't require us to draw up impulse lines, nor do we quantify any lengths, so these...
Hi Dan,
Thanks for your help and for the reference on best practice. I do have one more question about the tubing. On the same project, we noticed that some of our pressure transmitters were directed to be installed above their tap points. While I think we would be able to move them to lower...
From my experience, customers normally prefer that flow elements be inserted in horizontal pipes, though we're not really given reasons. If they are inserted in vertical pipelines, however, it's recommended that the flow is in an upward direction.
I would also like to see the criteria for it. At my place of work, we just consider it as standard work to use double isolation for taps.
The closest I could find was ASME BPVC Section 1 Part PG-60.6.1:
"Each boiler shall have a pressure gage so located that it is easily readable. The pressure...
1. I suggest looking up the equation to determine flow coefficient [Cv = q*(SG/dP)^(0.5)] and work from there.
2. Same as 1 but there's not enough info.
3. I am not sure.
It turns out I would be able to find some information on the port descriptions from API 608. Unfortunately my firm doesn't subscribe to API publications, it seems.
I am also of the opinion that it's not exactly full-port. These valves are also drain service valves, which leads me to think that...
Hi All,
We have a ball valve supplier explain to us the other day about the ambiguity on "full-port ball valves". There is a standard regarding port size on gate, globe, and check, but not ball valves (apparently). This was their explanation that allows them to supply a ball valve with ID 1.5"...
Interesting. My firm's internet security blocks this website; however, we use a program called FE Sizer, which will also calculate process conditions through venturis and flow nozzles as well.
Here's the link: http://www.control-soft.com/fewin32.html
Dan, thanks for the tip.
Kevin, I guess I wasn't exactly clear. It is .5" tubing, but the insulation/tracing came out to about 6" diameter, which is unnecessarily large.
Obviously, tubing bundles would be ideal, but since we have already purchased our tubing, I think we plan to just wrap the...
All,
We procured some bare, 1/2" SS intstrument tubing for hookup to static and differential pressure transmitters (Steam/water) with the assumption that freeze protection would be handled down the road by our Project Engineers. After looking at the final schematics, this tubing turned out to...
I only have 6 months of engineering practice in HRSG's; however, I may be able to answer this.
In our analyses, P denotes the design pressure; however, I've never heard of Surge Pressure, so my answer may not be reliable.
Outside diameter is normally constant. ID changes depending on...
