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  1. quadswift

    Min distance between circ seams weld

    I have seen it written in project specifications as a minimum of 2x the wall thickness between HAZ edges. Regards Alan
  2. quadswift

    Procedure Qual. & Pressure Equipment Directive

    I do not recall this being a requirement. Either do a 'google' or get hold of a copy of the regs. I am sure that if your procedures and qualifications were to code and witnessed by an independant third party then you will not have to re-qualify. From what I remember the regs were applicable...
  3. quadswift

    Ultrasonic Inspection of Inconel 625 Clad Vessel

    It is unusual to have lost all the inconel to corrosion / erosion. There are usually some areas more prone to it than others.If you have lost it then I would think the medium will be through the c.steel much quicker. Has he done scans with normal probes in several areas? If so has he received...
  4. quadswift

    316 SS pipe

    The basic answer to your question is NO. Regards, quadswift
  5. quadswift

    Cathodic Protection procedures, please help!!!

    I would have thought that you as the purchaser would have developed (or had developed on your behalf) some strategy for your requirements. It is usual to consider design aspects of corrosion and material selection and provide some specifications and data sheets to issue to your potential...
  6. quadswift

    Incoming QC on screws

    We have been here 'n' times before on this site, on specifying, levels of inspection and material certification / verifiction. I always believe in dealing with any problem as near to the source as possible. You checking stuff to this level on receipt is not really acceptable. You need to - know...
  7. quadswift

    What is 6 sigma in plain language?

    See www.isixsigma.com/sixsigma/six_sigma.asp Regards, Quadswift
  8. quadswift

    Pipeline Cathodic Protection

    I thought the sequence was: - product and soil survey data - required design life - leading to material selection - and determination of coating type and thickness / required CP system selection Regards, quadswift
  9. quadswift

    On-site pipe handling damage

    Thanks PVRV. There were only half a dozen cases and we have told them that they are unacceptable. Two were not too bad but it is difficult to come up with a precise criteria. I do not like rejecting things out of hand as it discourages people from bringing things to someone's attention...
  10. quadswift

    On-site pipe handling damage

    We have bought our piping to ASTM and are installing, on a remote desert, site (which is where I am now) to B31.3. The planning is not too great and there is much pipe handling going. There was spool pre-fabrication off site in-country and there are numerous welding habitats dotted about the...
  11. quadswift

    Subsea Bolts

    If it is critical, you should be use something like taper-lok flanges. Welding Units UK will be able to advise you on flanges and bolting. Have a look at www.welding-units.co.uk We have used them before and they do a good job. Regards, Quadswift
  12. quadswift

    HIC test How do we witness it?

    It is best to hard stamp the samples with your own stamp as they are cut. Stamp them in a place that will remain visible after preparation of the samples. Regards, Quadswift
  13. quadswift

    Centreline crack in welding

    There is also frequent reference (particularly with radiography) to 'centre-line shrinkage' where there is a small amount of concavity in the centre of the root bead area, due to differential cooling / 'shrinkage'. Not a problem as long as concavity is not out of spec and compensating cap /...
  14. quadswift

    Recent FAC & Oxygen attack in boiler feedwater equipment

    Is that where Rumsfeld stole his award-winning quote from? Quadswift
  15. quadswift

    SS304 / SS316 - how to check on them ?

    USJBH's comment reminds me. I remember in the 60's, watching a guy in a steelworks who was sorting some billets that had got mixed when some rail wagons had shed there loads in a shunting mis-hap in the marshalling yard. He had a small grinder and when he touched it on the billets he could...
  16. quadswift

    SS304 / SS316 - how to check on them ?

    Here we go again! There have been several questions about PMI and certification / traceability. As I have said before, why in this day and age of 'Q/A, ISO 9000 etc' are we querying the supply and the customer is looking at spending money to ensure he got what he asked for? You are entitled...
  17. quadswift

    100% Iodine...Ouch ! ! !

    What thickness did you add 2 years ago? I assume you used the same material for cladding. Use the same units for measuring (ins/mils/mm),& your loss rate numbers do not seem to compute. You now appear to be losing 0.300 inches in two years. Whereas you lost .75ins in 10 years previously. The...
  18. quadswift

    Strange corrosion of AISI 304 near the sea

    ps. Maybe they have bigger temperature ranges and use more de-icing salt on the roads in those areas? Do a google search and look at IMOA (International Molybdenum Association) web site where there is document 'Which stainless steel should I specify for exterior applications'. It has some...
  19. quadswift

    Strange corrosion of AISI 304 near the sea

    There could be some strange combination of halogens / chlorides ( in the sea-water, towns water, your detergents) and / or irons or other elements in the towns water in action. I would think that you would have to be near the sea-front for the location to have a significant effect. If the cost...
  20. quadswift

    Out of Roundness on Pressure Vessels After PWHT

    I know I am not really helping, but you have received all the relevant responses / acvice. I have never heard of doing PWHT in this manner. Why treat the whole vessel when it is just the welds that need doing? And in future, do local electric PWHT. Schedule is not always king, as you are...

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