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  1. samuelo00

    RTJ flange use

    Hi, Can someone tell me when it's recommended the use of RTJ flange? I have seen in many projects that for high pressures (i.e. over 600# or 900#) it is always used RTJ in process gas applications. Now I'm facing one in which RF is applied until 1500#, which is surprising for me. I have read...
  2. samuelo00

    Piping hydrotest pressure

    If the pipe ends open (atmosferic pressure), you don't have to test it.
  3. samuelo00

    Margin of Safety and Vibration/Shock Specs for General Marine

    The first question is very difficult to reply, it depends on what problem you are studying. If you are through the longitudinal stress, or a concrete structural member of the hull... There are ISO specs. for vibrations and shocks, and some Class. point to this ones: ISO 6954:2000 Mechanical...
  4. samuelo00

    X-ray examination scope

    Yes imctmga, that's also my opinion, I don't see the point in making radiographys to lines handling non hazardous fluids, but if a girth weld is not well done, then there can be problems with corrosion cracking, and hence the 100% radiographs. Thanks for your valuable answers. samuelo
  5. samuelo00

    X-ray examination scope

    Hi all, I am recieving from the engineering company some data confusing to me. For a carbon steel pipe with approx. 100°C op. temp. and 300#, in some cases we have to do 100% radiography to the welds and in other cases only 33%, in prefabrication. I have check the code (344.5 of B31.3, which...
  6. samuelo00

    Test and design pressure

    BigInch, You are right, it'sthe yield point, no failure, but I wouldn't go to that way unless it's really necessary. There can be permanent strains that maybe later can affect the stress analysis already done, which would imply a deeper study, and the project is not in situation of doing...
  7. samuelo00

    Test and design pressure

    BigInch, In case of 1 in your reply and in this special case (commercial thickness close to calculated thickness), and as zdas04 says, if I would test the pipe at test pressure, the material could fail. I think this is not a choice. I'm astonished that the code does not cover this issue, that...
  8. samuelo00

    Test and design pressure

    Hi all, When thickness of a pipe is calculated, it is used the design pressure. On the other hand, the test pressure is 1.5 times the design pressure (forget about temperature corrections). 1. What would happen if the commercial thickness chosen was so close to the theoretical design pressure...
  9. samuelo00

    Code for vacuum pipes

    Hi all, I'm wondering if the B31.3 code can be used for vacuum pipes. In the exclusions of the scope (para 300.1.3) it is said: " This Code excludes the following: (a) piping systems designed for internal gage pressures at or above zero but less than 105 kPa (15 psi), provided the fluid...
  10. samuelo00

    Piping hydrotest pressure

    Design pressure is the maximum pressure you can find in your test system, it may involve pumps (pressure at closed valve, this is the maximum pressure the pump develops), safety systems, etc. You have to take corrections for temperature also, the place where you should look at for more...

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