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  • Users: blawn
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  1. blawn

    hardness number

    Hello everyone, I am searching the hardness number of SA 178-C material.Its not in ASME part II-A.(or maybe its somewhere there) I have a requirement to take hardness test on this material and I just want to know the maximum and minimum hardness number limit. Kindly point me to a...
  2. blawn

    Piping Certification

    Dear All, Good day! Kindly give me your thoughts about issuing a piping certificate after inspection. I have a client asking for a certificate after inspection of an in service piping. The certificate shall contain parameters stating that the piping is fit for service for a certain duration...
  3. blawn

    API 1169

    Dear All, I have background in inspection of in-service pipelines tanks and vessels. Currently API 653 certified. I'm planning to take API 510 and 570 but there are too much people in this field as I noticed. I want to take the API 1169 but I'm not quite sure about employment in this field...
  4. blawn

    Positive Material Identification(PMI)

    Dear All, Just want to ask something about PMI.I recently used a PMI machine or tool,to identify sets of pipes and plates stocked in our facility. I found out that the machine will identify the stainless steel properly,with the grade and alloy percentage displayed on the screen. Now when it...
  5. blawn

    In service inspection

    Dear All, Guys kindly help me out here. I'm a little confused on terms and definitions used in the field of inspection. In API 653,other people called it "in service inspection"if you are inspection a tank which is not shutdown.And "out of service inspection" if the tank is shutdown.Now I...
  6. blawn

    Maximum Allowable Internal Pressure

    Dear All, In the evaluation of an existing tank for max.allowable internal pressure,there's a formula used by other people which is: t yn=thickness of the tank component under consideration at the next inspection at twice the calculated corrosion rate,which is t act-(2*Cr*Yn) I just want to...
  7. blawn

    EDGE AND RINGWALL SETTLEMENT EVALUATION

    Dear All, Just want to clear something.Why does the evaluation of edge settlement is separated from the evaluation of ring wall foundation? Assume we have a foundation ring settles and so was the edge of the bottom plate(which also affects the shell),what criteria for evaluation will govern?If...
  8. blawn

    SETTLEMENT EVALUATION SOFTWARE

    Dear All, I'm looking for a software for plotting optimum cosine curve in evaluating tank settlements. Anyone who can direct me to where I can get one of this? Thanks a lot! regards, jb
  9. blawn

    Shell patch Plate

    On what side should a patch plate be installed on a shell?I have a tank to be repaired.There's a crack on the shell about 1 meter below the roof.Im planning to grind crack wide open then weld it(build up)and patch it on the product side. Im not so sure if this method is allowed.I cant find...
  10. blawn

    Joint efficiency of water storage welded tank

    Hi, I'm currently evaluating a tank built in 1981,design code is AWWA D100-73 APP.C I want to know the joint efficiency of the shell that was used during design.Shell plates are butt welded.I cant find any files of this old tank. Any suggestion how to determine the joint efficiency?Thank you...
  11. blawn

    tank shell evaluation

    Hi, API 653 Section a paragraph 4.3.3.1 a)when determining the minimum acceptable thickness for an entire shell course,t min is calculated as follows: t min = 2.6(H-1)DG/SE S=maximum allowable stress, E=joint efficiency, G=specific gravity of contents, H=height of the course in consideration...

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