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  • Users: Patassa
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  1. Patassa

    B31.3 vs. API 521

    All, I'm down a rabbit hole trying to understand if there is a conflict between the 10/13 rule for exchanger tube rupture over pressure considerations in 521, allowing me to not install a PSV on the low pressure side, as long as the high pressure side doesn't exceed my corrected hydrotest...
  2. Patassa

    API 521 10/13 rule vs B31.3

    All, I'm down a rabbit hole trying to understand if there is a conflict between the 10/13 rule for exchanger tube rupture over pressure considerations in 521, allowing me to not install a PSV on the low pressure side, as long as the high pressure side doesn't exceed my corrected hydrotest...
  3. Patassa

    Handheld Vibration reading device

    Hello everyone, Can anyone recommend a make & model of a handheld device that we can purchase to take vibration readings on process piping in the refinery that I work in? We need something that can read low enough for typical low frequency pipe vibrations, I see that some Fluke models are...
  4. Patassa

    Pipe Vibration Training Experiences

    Hi guys, I work in a oil refinery as a small projects engineer with some reliability and some maintenance tasks also. Myself and others in my role are frequently tasked with looking at pipe vibration issues around heaters and towers and attempting to access whether things are "OK" or if...
  5. Patassa

    Hoop Stress on Circumferential welds?

    I'm working on a leak repair on a large cooling water line and the probable solution will be to weld on a full encirclement split tee. A more experienced engineer actually told me that the fillet welds (circumferential)would "push me into the next size pipe schedule" due to them being weaker in...
  6. Patassa

    Pressure Problems

    I've worked myself into a bit of a loop here. A question came up from a younger colleague today that at first seemed a bit silly but after running a model I might see his point too. Basically, the question was if my pump discharge piping immediately sizes up say from 2" to 20" and I sized the...
  7. Patassa

    Learning Refinery Processes

    I'm a Mechanical Engineer who after some time away at a design firm and medical school (long story) is returning to a refinery to do small projects. I have some organic chemistry under my belt so I have a small piece of the foundation needed to understand the process in a way that I didn't...
  8. Patassa

    Would like some guidance

    I'm a mechanical engineer at an EPC firm doing most project engineering (documentation, specifying equipment, checking vendor packages for technical acceptance, etc) with 4 years in plant maintenance/some reliability and about 1.5 years in the EPC world. I'm at a bit of a crossroads and need...
  9. Patassa

    Mistake in Peng's Book?

    Hi, I'm currently studying Mr. Peng's book on Pipe Stress engineering and on page 52 in the discussions of the different failure theories he states that "ASME has adopted the maximum shear failure theory in its piping and pressure vessel codes", but I'm also reading Mr. Becht's guide to 31.3...
  10. Patassa

    Best Single Resource for Understanding Pumps

    Evening gents, I'm working at an EPC company after a few years in a refinery and there is no senior ME at the moment which leaves me to spec pumps, other equipment, and even perform some pipe stress engineering. This stuff does eventually through checks by other senior engineers at our other...
  11. Patassa

    Turbine Steam Usage problem

    I'm trying to spec out some new turbine steam trip valves for a client. The valve manufacturer is requesting the steam flow rates through the turbine. I've asked the client for the information and the Process engineer has given me a couple of numbers based off of the pump data sheets that have...
  12. Patassa

    Calculating tube growth in furnace

    We're working on a client package to install new tube skin TIs in one of their vertical circular furnaces. One of the requirements is to specify the direction of tube growth and the growth dimensions where the TIs will be located on the tubes. Is there any guidance or examples of this that I...
  13. Patassa

    Shell Guideline on Fired Heater Tube Skin Thermocouples

    I'm hoping someone knows the correct interpretation of this line in the context of where to place tube skin TI's. "In mixed flow vertical tubes, a down-flow tube is selected" I'm unclear as to what "mixed flow" means in this context. This is a naphtha tower reboiler. Thank you
  14. Patassa

    Min flow for old pumps, manufacturer not around

    Hi, A client is wanting to trip their crude tank pumps at some unspecified minimum flow. I have obtained the data sheets and pump curves for the pumps, they were made by "Pacific Pumps, Inc" and the requisition is dated 1966 so I don't think going back to the manufacture for minimum flow...
  15. Patassa

    Is there a minimum nozzle length requirement?

    Hi, We're having some issue getting the clearance we need between an instrument and a guard rail. We're cutting in two new nozzles on a furnace and the question has come up, "Can we shorten the nozzles?" to give us a few more inches. Right now we've drawn the nozzles 12" long from the wall to...
  16. Patassa

    Adding Exhaust Head on Deaerator Vent, help

    A client recently installed a new Deaerator that we spec'ed out and had designed for them. They are now wanting to add an exhaust head on the 2" steam vent atop the vessel. The exhaust head they want to add weighs roughly 60 lbs and we'd also have to install two 2" valves for bypass incase of...
  17. Patassa

    Tower Metallurgy for MEA Stripper

    I'm not sure if there is an industry standard practice for this but a customer is wanting to replace their MEA tower with some type of stainless. The current tower has 316SS cladding on a carbon steel shell. The cladding was damaged and the MEA + CO2 + H20 = Carbonic Acid has attacked the carbon...
  18. Patassa

    Pump and Control Valve, Chicken or the Egg?

    I've worked myself into a circular reasoning of death here. Help. I'm starting in a phase 2 of sorts of someone else's design and project. The gist is this, the former principle mechanical engineer ran a really rough 1st draft of hydraulic calculations to spec a new pump and a new flow...
  19. Patassa

    Summary Outline/sheet for pipe stress analysis

    Hello, Straight out of school I went into the refinery world as a maintenance engineer where I dealt very little with any type of analysis besides some back of the envelope checks. I'm now in a design firm and have projects that will require the use of Cesear/etc pipe stress analysis. We have...

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