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  • Users: magusinp
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  1. magusinp

    B31.3 5% Radiography Conformance Requirement

    Our company manufactures Magnetic Level Gauges to order. We are registering this product line with CSA (CRN number) as being built under ASME B31.3 We are seeking to conform to the Examination Requirements of Ch. VI of Asme B31.3 before I get the ASME Inspector out here to certify our QC...
  2. magusinp

    Strength of Partial Penetration Welds

    The company I work for builds instrumentation for the oil & gas industry. The pressure containing parts of one of the products is built to B31.3 They are welding a 2-1/2" s/10 weld cap to S/10 pipe (316/316L). But instead of holding the root gap open and full pen. welding, they lay the cap...
  3. magusinp

    Bonding PTFE to EPDM

    I am designing a product which will be using a diaphragm. It needs to be PTFE coated EPDM. The supplier sent back samples bonded with an acrylic-based double-coated film. These diaphragms peeled right apart. I believe there is a better way to bond PTFE to EPDM. I have heard that the best way...
  4. magusinp

    Welded Branch Reinforcement

    I am calculating a branch connection of 2" pipe into 2-1/2" using ASME B31.3. The criteria for determining the amount of reinforcemnet area is directly related to the amount of material removed from the header. The amount of material removed from the header pipe is usually the same diameter as...
  5. magusinp

    Welding through pipe

    The company I work for makes instrumentation for the petrochemical and oil & gas industry. The standard we conform to is ASME B31.3 (not BPV!) I am in the process of back checking legacy designs to see if they, in fact, conform to this standard. One of the products they make requires a 3/16"...
  6. magusinp

    Dual Rated Pipe & Fittings

    Whenever we receive pipe & fittings dual rated as "316/316L", for example, does that ALWAYS mean that the allowable stress will be the HIGHER rating of the two? The pipe distributor said it's true & I looked at a few MTR's and the mechanical test Tensile Strength & Yield Strength were the...
  7. magusinp

    U-Cup Friction Calculation

    I am designing a product using U-cups in a double-acting piston seal. The piston diameter is 1.5625" and the pressure on the face of the piston is about 3 psig. The only force activating the piston is the 3 psig on the face. The device is operating in SAE 30 oil so there is enough...
  8. magusinp

    Minimum Pipeline Flow

    I am designing a device that uses the energy from the flow velocity in a pipeline to function. So I need the forum members to tell me what you use as the minimum practical pipeline flow velocity. This device may be used in mainline and plant environments so I would like the full range. So far...
  9. magusinp

    Sacrificial anode body to preserve tiny spring

    I have designed a device which has an Inconel X750 spring within a large 316 SS body. The Inconel is passivated so its corrosion potential is -0.3, the 316 SS (active) has a potential of -0.79. The spring material is only 0.025" thick. The SS body is a piece of 1 1/2" thick bar stock with a...
  10. magusinp

    plastic/steel waer resistance

    I am testing a PD meter with a reciprocating valve design. The fluid being measured must switch from the inlet to the outlet strokes. In order to switch the meter a plastic valve seal rubs across a metal seat. The parts are all immersed in SAE 30 oil. The valve works like this: The oil...
  11. magusinp

    Spring material in 96% sulfuric

    What type of spring material would be recommended for 96% sulfuric, ambient temperature. This is a pipeline application so it probably has no entrained air. We currently stock Inconel X750 springs. But I am afraid that these will not last very long. Is that true in your experience?0
  12. magusinp

    NaOCl vs. Inconel X750

    What kind of corrosion rate will I experience using an Inconel X750 spring in 14-16% sodium hypochlorite? The solution is being injected through a ball check made of HC-276 with a ceramic ball. I don't expect there will be any aeration. The Hastelloy and the ceramic are fine but I am not sure...
  13. magusinp

    Building up Stainless

    Visited an investment casting foundry last week. The owner said that he 'built-up' 316SS from 304 by adding Mo to the melt. He explained that he could build up various different metals this way. He verified the composition using a spectrometer he has in-house. He would not do this if it were...
  14. magusinp

    Offshore electrical

    I am the I&E Engineer for a company that provides skid mounted equipment for the pipeline industry. Usually all our work is land-based but today I have a new project, a 30" pig receiver, which is going onto an offshore platform. The project involves solenoids and limit switches for 5...
  15. magusinp

    Electrical Design on Offshore Platforms

    I am the I&E Engineer for a company that provides skid mounted equipment for the pipeline industry. Usually all our work is land-based but today I have a new project, a 30" pig receiver, which is going onto an offshore platform. The project involves solenoids and limit switches for 5...
  16. magusinp

    Valve Sizing Equations: What is Correct?

    The Universal Gas Sizing Equation Q = SQRT(520/(SG*(Temp+460)))*Cg*P1*SIN((59.64/C1)*SQRT(P1-P2/P1)) establishes one Flow Rate. There is a Fisher simplified version Q = Cg*P1*SQRT(520/(SG*(Temp+460))) for critical flow. There is another simplified version from Moooney Q = P1*Cg*1.29. Finally...

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