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  1. Amir35

    Cracks Propagation Has Been Observed in FRP Flange

    Mr littlelnch; All of your comments and posts are so useful and I always get valuable points from your suggestions. ...I am showing my respect to you (the person who not trying to sell everything he can sell). It is great that people like you are sharing their knowledge and not trying to sell...
  2. Amir35

    Cracks Propagation Has Been Observed in FRP Flange

    After applying hydro static test on FRP piping,crack propagation has been observed on one of flange's body.it should be shaved(grinded)for depth estimation.we have no acceptance criteria for crack size on FRP flanges.I even have no idea about employing fiber glass polyester flanges with cracks...
  3. Amir35

    Teflon Pad Under Shoe Support and Pipe Expansion

    thanks for your recommended solution,it seems to be applicable ...42" Pipe length from nearest anchor is almost 110 meters so the expansion causes high shear force at shoe sitting point,I hope glue can withstand this force and can hold the pad.
  4. Amir35

    Teflon Pad Under Shoe Support and Pipe Expansion

    thanks for your answer but how?
  5. Amir35

    Teflon Pad Under Shoe Support and Pipe Expansion

    Following support arrangement is used in our project: 42 inches pipe has been welded to shoe support then shoe sits on base plate on concrete sleeper. between these two members Teflon pad has been installed .During the construction after changing ambient temperature ,The pipe expands and...
  6. Amir35

    Query about API 5L

    In API 5L there are some key words that client subjected to when dealing with suppliers , but API has no criteria or references even recommendation for them: 1-Fully killed steel 2-Banding 3-Inclusion size I am looking for these definitions acceptance criteria .Has anyone been experiencing same...
  7. Amir35

    42 inches ring

    The type is octagonal and used for sweet gas service,we severely in lack of time and almost at the end of project we have found the ring and flange are not matched,there is no time for new order and we should do plan B,what is plan B?filling the ring seat and machining for existing ring or...
  8. Amir35

    42 inches ring

    Dear Xl83NL As you said I cheched out the point in ASME B16.47 and found out after 36inches there is no dimension for seat ,up to 36 inches RTJ flange we have all dimensions for seat geometry then proper Standard recommendations are not applicable in this case,I think after 36 these dimensions...
  9. Amir35

    42 inches ring

    Flanges followed B16.47 standard but I didn’t find any punches on rings,Do you have any experiences on shaving or machining ring or flange in mentioned situation?
  10. Amir35

    42 inches ring

    I am working on a piping installation project,we have a 42 inches class 900 ,RTJ flange provided from stock material with no ring,we searched for related ring from other resources and found different ones with same descriptions but non of them does not match within ring seat,At first how could...
  11. Amir35

    FBE Mechanical Protection

    Dear Engineers We need to choose between FBE(Fusion Epoxy Bonded) and 3LPE for underground Stainless Steel pipe external coating,Before this we 've used 3LPE(3Layer Poly Ethylene) for these kind of pipes and temperature condition,but now contractor's presented FBE which is unknown for me in...
  12. Amir35

    Use of Spectacle flanges

    If you select proper Material and rating,there will be nothing to worry about.For example ASTM A387 Gr11 Cl 2 is a good material for HP steam superheat ,Any way you may consult with your Process Engineering Discipline.
  13. Amir35

    ASME B313 Hydrotest gauge tollerance

    There is no requirements in B31.3 Code book but respected companies have their Specification as following: "Pressure gauges shall be of the Bourdon tube type, complying with BS 1780. The nominal diameter of each gauge shall be 100mm.dial gauges used for testing shall have a range of a about...
  14. Amir35

    visual welding inspection

    Para. 344.6.2 ASME B31.3 for ultrasonic examination of welds, and elsewhere in the ASME B31.3 Code. (a) Table 341.3.2 states acceptance criteria (limits on imperfections) for welds. See Fig. 341.3.2 for typicalweld imperfections. (b) Acceptance criteria for castings are specified in para. 302.3.3.
  15. Amir35

    Thickness Build up

    Dear DekDee and LittleInch - Three flange stresses are calculated as follows: • Longitudinal hub stress:is the bending stress that varies through the hub thickness this stress as essentially a bending stress with the maximum stress being nearly always at either extremity of the hub. • Radial...
  16. Amir35

    Thickness Build up

    All Upstream and Downstream spools have been installed and supported,Believe me It's not possible to remove or extend even 1 cm,But thanks for your suggestion.Do you think flange rating is not affected by reducing hub thickness? Thanks
  17. Amir35

    Thickness Build up

    Thanks,I made a correction on the post." Does the hub wall thickness influence on flange rating?"it is the question I had from involved person in the Executing team that supposed to answer by formula,but verbally said "we are not allowed for 8 mm reduction ",I know the important thing is bending...
  18. Amir35

    Thickness Build up

    Thanks for joining this thread,Flange is overlaied by inconel in factory and delivered to site prefabricated,also we have design consideration for flange hub.
  19. Amir35

    Thickness Build up

    Thanks for your opinion,The "Build up"phrase is used in ASME SEC VIII DIVISION 1 UW-42,It is Welding Build up,I am agree with you the tests results are needed but before that I need an evidence about this kind of thickness enhancement or someone who had similar experience. Thanks
  20. Amir35

    Thickness Build up

    Dear Gentlemen Here we have a problem ,we are going to weld a 19 mm carbon steel flange hub, with 3 mm inconel 625 overlay ,to a 14 mm Solid inconel pipe, Executing team has presented a plan to build up the pipe with 8 mm inconel and then start welding. On the other hand, we have no free space...

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