Forum - I know there have been past threads on this, but my question relates to a specific question on the company standard I'm working with on API valve trim types & NACE requirements:
Question 1) - Under the company standard I'm working with, if the process service is "Sour Water" or...
I have a task to repair an existing pass plate on an existing S&T HX channel (~5'-6" diameter channel, pass plate is 1/2"-thk, carbon steel) during an upcoming outage due to knife-edging expected on the pass plate edge where it bolts up to the existing tubesheet. The service for this channel is...
Curious forum's opinions or experiences on this...I work at a refinery with an HF Alky unit. We've had many HF acid leaks in past with valve bolted bonnets, particularly with small bore gate valves. I would like to change to welded bonnet (threaded & seal-welded) style small bore gate valves...
Curious forum's opinion on minimum girth weld & branch weld spacing requirements on new piping & modified existing piping (B31.3 code)?
Most companies have best practices/standards that define minimum weld spacing clearances for girth & branch welds for new piping. However, I'm not 100% sure...
Does forum have any experience ordering Strahman sampling valves? I am needing to order replacement ones for downstream/petrochem applications. I am not having any luck contacting Strahman & getting ahold of anyone.
Also, is forum aware if any competitor products that exist for these...
I have to hot tap & line stop/stopple 3 different steam lines in near future (15#, 90#, & 400# steam lines). My only line stop experience is with low temp stopples from TDW using the standard pivoting stopple head with elastomer cups/seals. The last time my site attempted a line stop on a...
General question for forum - I'm looking at replacing several structural steel beams on a structure that have historically been fireproofed with concrete. I'm interested in going back with new structural beams that are fireproofed with intumescent coating instead. These members would be...
Curious the forum’s recommendations lube
oil piping design connecting to machinery (pumps, compressors, etc.)?
My understanding is the ideal is buttwelded stainless steel. I will be implementing this in an upcoming project for 3/4” & 1” lube oil piping. My RFWN flanges will have typical...
General question for the forum on shop hydro testing replacement tube bundles to be installed in an existing shell & channel (S&T HXs):
I work at a plant where it is unfortunately very common practice to replace existing tube bundles at end-of-life with new in-kind tube bundles, reutilizing the...
I’m installing a permanent Type B full encirclement sleeve around a large line that has a local thin spot on it (but not actively leaking). New Type B sleeve will have pressure-containing circ seam fillet welds. I have run some calcs on the new sleeve circ seam fillet welds to check the total...
A number of my coworkers are in disagreement with my understanding of B31.3 hydrotest requirements for needing to hydrotest every component in a new piping system (with exception of the closure weld). A situation has come up where a new B16.5 WN flange is being used at a tie point where the...
Question on Chloride Stress Corrosion Cracking in 300SS material - working in oil refinery industry, looking to retube a naphtha furnace with new 317/L tubes. Some materials engs have expressed concern with CL SCC potential. The Process engs are claiming aqueous chlorides are not possible in...
I believe this has been posted before, but I have not seen a satisfactory response. How does one go about ensuring a SA105N flange is produced to a "fine grain practice" in order to meet the impact test exemption of VIII-1, UCS66 for these under Curve B?
Curious the forum’s opinions/experience with using CMG gaskets in pipe flanges in oil & gas industry. In my experience, CMGs should be avoided in all pipe flanges & typically are not even allowed in 300# pipe flanges & higher by most companies & consultants. However, company I work for allows...
I have a 1-1/2 RFLWN nozzle (304L material) on a tower that began leaking at the nozzle to shell weld about 15 years ago. At that time, they decided to weld circular patch plates around the nozzle after confirming a through-wall crack via NDE. Looking at it from outside, most people thought...
Curious for those with any experience with High Velocity Thermal Spray (HVTS) of high alloys inside VIII-1 pressure vessels for corrosion resistance ... would the application of this (typically only 20 mils thick of Hastelloy C276, or similar corrosion-resistant alloy, as I understand) allow you...
I'm looking into a resolution for machining down a girth flange face on a TEMA/Section VIII S&T exchanger where we've found some pitting on the shell flange face where it bolts to the tubesheet. We will be replacing the tubesheet & tube bundle with a new one but have concerns about the existing...
Wanted to get the forum's thoughts on a recent construction issue I've had with a reinforced concrete foundation for a large pump skid. The foundation is roughly a large rectangular block consisting of ~25 cu yards of reinforced concrete. Our project manager insisted we specify fiber mesh to...
Hello Gentlemen,
I'm sure that has been addressed somewhere in the annals of eng-tips.com, but I couldn't locate a thread on it. I have a simple question - Can I expect a contractor to successfully butt weld 1" SCH 80 CS pipe?
I'm working for a client that allows this in their piping specs...
Hello All,
I do not normally work in HVAC, so I was hoping to get some direction from the forum on some basic ventilation concepts inside a small industrial building. Basically I have a small one-room Laboratory Shack (10'x24') with a stand alone fume hood inside a Oil & Gas facility. The...
