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  • Users: zibaeng
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  1. zibaeng

    Checking electrodes coatings

    Dear friends, I was wondering if there are any standards (or any other types of documents) for checking electrodes coatings. In the other words, what are the ways to check if the coating of an electrode is fine, and according to what standard are these ways? Thank you in advance,
  2. zibaeng

    Stress relief for bended stainless steel heat exchangers

    Hi. We use U-type Stainless steel heat exchangers for boilers. These heat exchangers are subject to stress because of bending. My question is how can we relieve stress? I know we can't use PWHT for stainless steels because of knife attack.
  3. zibaeng

    PWHT thermocouple attachment

    Hi friends. In separated junction method of attaching thermocouple wires (for PostWeld Heat Treatment), why do we attach (weld) each wire of thermocouple separately to the surface of the workpiece? Why not connected to each other? I know the wires of a thermocouple should be connected to each...
  4. zibaeng

    Temperature difference between thermocouples in PWHT device

    Hi. How much difference in temperature between thermocouples in PWHT device is allowable? Thank you.
  5. zibaeng

    Hardness Testing after PWHT

    Hi. I want to know why hardness testing is performed after PWHT? Is it required or recommended (According to which standard)? What will be happened after PWHT that make us to perform hardness testing? And why is it important for us? Thank you in advance.
  6. zibaeng

    Using KAYNAR and HALAR cables in cathodic protection

    Hi everyone. I have two questions. 1- What are the differences between KAYNAR cable & HALAR cable used in cathodic protection? 2- If we have bought a cable from an unknown vendor, how can we find out the cable is HALAR or KAYNAR? Thank you in advance.
  7. zibaeng

    Number of weld repair

    Hi. Are the materials of thickness greater than 12.7 mm, subject to impact tests at temperatures below 0°C? If yes, according to which Standard? Thank you in advance.
  8. zibaeng

    Using XLPE/PVC cable in cathodic protection

    Hi there. Can't we use XLPE/PVC cable instead of HMWPE/PVDF for cathodic protection of underground pipes? If your answer is no, please explain why? Thanks.
  9. zibaeng

    Quality assurance action plan in cathodic protection field

    Hi everybody. Does anybody know about action plan for quality assurance(QA) in cathodic protection field? I mean a list of procedures(or plans) which improves the cathodic protection of Piping. Thank you in advance.
  10. zibaeng

    Underground Pipe Wrapping Inspection

    Hi everybody. I want to know which parameters should be checked for inspection after UG pipe wrapping application, and how long after applying wrapping, the pipe should be sandfilled and backfilled (buried)? Does the sunlight damage the wrapping tapes? Thank you.
  11. zibaeng

    Underground Pipe Wrapping Inspection

    Hi everybody. I want to know which parameters should be checked for inspection after UG pipe wrapping, and how long after applying wrapping, the pipe should be sandfilled and backfilled (buried)? Thank you.
  12. zibaeng

    Wrapping Application

    Hi everyone. I want to know why the Primer(Epoxy)will be applied after Surface Preparation (and before Wrapping)? What is it used for? And how long after surface preparation, the primer should be applied? Thank you.
  13. zibaeng

    How to determine voltage for Holiday Test

    Hi Everybody I want to know how to determine the voltage for Holiday test in Underground Pipes. Is It related to pipe thickness or Polyethylene coating thickness? How does it relate? Thank you in advance.
  14. zibaeng

    Hydrogen Cracking Types

    Hi everyone. Excuse me because of my bad english grammer. I searched into the internet and some handbooks for hydrogen cracking types, and found different answers. Am I right? "There are 4 types: Cold cracking, underbead cracking, HAZ cracking and delayed cracking" If it is right or not, please...

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