I have a 50% caustic storage tank designed per API650 that has a Ni repad on ID for a steam tube. The weld of theB162 Nickel plate to the A283C plate failed and the shell has buckled and there is some signs of Caustic SCC. I would like to have a tombstone shape cutout and replace the CS shell...
On pump shaft drawings that list the depth of the key way is the depth measured on the sides or in the center. If measured in the center then the downward curvature would mean the edges would not be as deep. The drawing does not specify where the measurement is taken from. Is there a standard...
I have two Detroit Diesels Model #8064-7612 92 Series DDC Engine which are our emergency backup Fire Water Pump engines. They are run weekly per NFPA 25 standards and have exhibited poor reliability over the years. Part of the reliability issues have been turbos which develop leaks and catch...
I am looking for some help and recommendations on cryogenic nitrogen service seal faces. I currently use a Tungsten Carbide to PPCF polymer faces as in the link below.
http://www.ppcmechanicalseals.com/PDFs/Cryogenic-Brochure.pdf
We have significant seal issues and typically get a few days to...
I am having new pump shafts manufactured and was wondering where I would go for detailed information on the dimensional tolerances for the manufacturing of the shaft. What API standard list the requirements for the diameter tolerances?
My site has an existing tank that is no longer used and the HAZMAT team would like a small door sheet like cut out for training purposes. This would allow the HAZMAT responders to perform rescue attempts in confined spaces with supplied air. The question I have is how do I determine the...
Long story short currently have a carbon steel pipe buried underground with two exposed flanges and flanged valve all underground. Carbon steel nuts and bolts were used. Plan was to leave the hole open until the next outage in 2-3 years and then redo the piping to remove the valve and add a...
I have a coded hair pin exchanger with general pitting. If certain pits are below tmin, what guidance should I follow for taking an average of the area? API 510 7.4.3? Can someone give me a quick understanding of general corrosion and pitting guidance that is a good practice to follow for...
Thanks in advance for any answers to my questions.
I have an exchanger with a machined flange that is used as a slip on with a groove for a split ring to connect the barrel of a hairpin exchanger. What requirements are there for a shop making this flange? Does it require a coded shop to make the...
During the shutdown I am planning on performing a hydro test on an exchanger and must install two blinds. These will be temporary and will not hold pressure for long. History reports noted that the spacing between flanges was to thin to meet ASME B31.3 blank calculations for thickness. The pipe...
Looking from a little advice from some piping engineers regarding a modification I would like to make to save labor and materials. During construction a feed line operating at 235degF and 30psig was designed with what appears to be a small expansion loop. I would like to remove the extra run and...
I have a nozzle inside of a vessel that is no longer used and needs to be removed or isolated to remove the pocket it creates that can fill with hydrogen. The setup is a 8" Class 1500 nozzle on the outside of the vessel with a Sch. 80 8" nozzle on the inside of the vessel approximately 5" long...
Hi,
I am trying to acquire a device to help pinpoint the location of underground pipe leaks in a chemical plant. The lines are cooling water lines operating between 60-80psig and sizes between 6"-48". The lines are typically located 6'-14' below ground (including 8"-12") of concrete. We have...
Does anyone have a link or some information on the strengths of square tubing along with requirements of meeting OSHA standards. I am putting up handrails in my plant and have tons of 1" square tubing. OSHA requires the strength below;
c) Guardrail must withstand 200-pound force with no more...
I am purchasing a new bladder accumulator for my site and was wondering of the compatbility of ASTM SA-372 Gr. E CL 70 with glycerin. The existing accumulator is no longer supported and we are unable to obtain spare parts. The existing shell is 316SS and we have never had issues. The vendors we...
I have a 26" elbow that is in an extremely difficult place to remove and no pipe supports for the rest of the hanging pipe. Thickness was measured at .205" with a required thickness of .06" but typically we want a thickness of 0.100" for structural purposes. I do not want to run into a issue in...
We have a few rotary locks that transmit PTA powder (similar to flour). Hard concrete like rocks form in the powder that get transmitted with the product. When this hits the rotary lock it puts a lot of stress on the paddles and cracks ensue. What are the best ways to support the blades? Cracks...
Thanks in advance for your comments and advice. I currently have square braided PTFE packing on a cylindral slow rotating dryer that is not 100% cylindrical. We are having problems with packing (not as much anymore since we are on a more frequent greasing schedule) of the packing rolling up on...
I work at a plant and we are needed to unload a powder product that is loaded in shipping containers like you see on cargo ships. They are brought to us on trailers. We already have a hydraulic dump station that we gravity feed the powder out, but we have more product than we can unload through...
Is it ok to widen bolt holes 1/8" too allow for a gasket to fit between flanges? Does this lead to uneven stress? I have a large 20" plus line with a metal gasket that is approximately 3/16" too wide to sit in between the bolts. I would like to widen all bolt holes slightly to seat the gasket in...
