I already saw this thread: https://www.eng-tips.com/viewthread.cfm?qid=408324
I'm looking for Type 4 washers that meet A829. PCC-1 has the following note:
"(2) Type 4 low-alloy steel washers shall be manufactured from SAE number 4130 or 4140 steel listed in ASTM A829."
However, much like the...
Looking at PFI ES-7 (Minimum length and spacing for welded branch connections), spacing is not tabulated for branches below 2-1/2". What's the reason for this? Is weld spacing not as important for small bore connections? I can go to B31.3 304.3.3(e), but that appears to be a section for...
Good morning y'all.
I have searched through this site and read some good information on tapping holes or nozzles in blind flanges.
Due to space requirements, we need to reduce from 16" to 10" within a 12" span. Originally, I was going to use a 16" blind flange, a 16x10 weldolet (flat), a...
Good afternoon,
We have a few large hydraulic cylinders controlling loading arms for loading ships at a terminal. These cylinders are subject to a harsh environment of salty air and as a result the rods are prone to small pits and some corrosion. I believe they are hard chrome plated. One of...
See the title. Is there any guidance around the minimum distance of the mounting hole location from the edge of the mounting pad? I looked through our company standards and API 610 but didn't see anything for hold down bolt location requirements. I'm mostly just curious.
Or does this come down...
Hi y'all,
Yes, another question about throttling a gate valve. I know for typical applications throttling a gate valve is inadvisable. However, one of the managers at my site constantly requests that gate valves that are root valves to instrumentation (e.g. manual pressure gauges) are...
Hi y'all,
I'm normally a fixed equipment guy (piping and vessels) but I've got a new role now, so apologies in advance for any ignorance I display.
I have a centrifugal compressor with 2 suction stages and 1 discharge stage. One shaft, one case, 3 impellers per suction stage. I have been asked...
Good morning y'all,
For many of our HRSG drains and vent lines, the OEM called for globe valves. The HRSG is starting to get up there in age so some of these lines are needing replacement. For some reason the maintenance guy before me stocked our warehouse full of gate valves. Is there any...
thread794-412119
For our upcoming turnarounds we'd like to set up a database of our heat exchanger girth flanges and their associated minimum thickness in case flange repair is required. However, tubesheet flanges have a recessed face for the gasket. The referenced thread above has one...
One of our bundles in our HRSG has had a couple of failures on the top return bends. These are 2 1/4 Chrome tubes, .105 wall, with a design temperature and pressure of 700ºF at 790 psig. As it turns out, these tube to return bend welds were not PWHT during fabrication. The bundle is about 2...
Hey y'all, hope everyone had a good holiday.
I'm looking at an exchanger made in 1943. The body flanges are A216 GR EWCD according to the drawing. I can't find this grade anywhere; not even on Google! I have the ASME Sec VIII code from 1943 that has A-216 cast steels grades WCA and WCB. but no...
Hi all,
I've got an induced air flotation device to skim oil from our waste water. It's a standard design, almost like a skid, installed about 30 years ago. There is no documentation save for a drawing, no stamp, and no data sheet. I asked the OEM if they had any calculations or anything and...
