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  • Users: LJthien
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  1. LJthien

    Final leak test of HVAC system

    We are going to do the final leak test of HVAC system after installing and connecting all portions together. I only know I can do it using a blower or a fan and measuring airflow and pressure differentials. Can someone advises me if there are tools for testing portions of the duct separately...
  2. LJthien

    Will Acrylic resin paint stick to galvanized steels

    Hi brothers, I need to repair some hot dip galvanized items and I understand that 95% Zinc paints are normally used. Just to consult you if I can apply an Acrylic resin paint to the galvanized steels since I have the paint available. Please advise if Acrylic resin paints stick to galvanized...
  3. LJthien

    Heat affecting on metal pieces cleaned by laser method

    I am considering to apply laser cleaning method for touch-up painting of some special items which are long galvanized bars of 2mm thickness. I have never done it before and I worry that the heat of the laser beam may cause a deformation on the thin bar items. Can anyone advise me the temperature...
  4. LJthien

    Service life of electrostatic powder coating comparing with conventional painting method

    Hello guys! I receive some metal products which are coated by electrostatic powder and I try to figure out if the service life of electrostatic powder coat is equal to conventional painting methods or not. My point is, items are coated by electrostatic powder are not blasted and therefore no...
  5. LJthien

    Contact protection protocol for the plant

    Hi, We are reviewing documents of our new project, which say "Contact protection protocol for the plant is required". I am not sure what it exactly is as this is the first time I see the requirement for electrical work. Can someone help explain me what "Contact protection protocol for the plant"...
  6. LJthien

    FDA compliance

    Hi all, I am purchasing some gasket and sealing materials from a manufacturer based in Europe, which should be FDA compliance. My understanding is that if the sealing material is the type approved and listed by FDA then we can accept it without any addition FDA compliance certificate. Please...
  7. LJthien

    How to verify US-FDA compliance for sealing product

    Hi, This is the first time we purchase some gaskets and sealing materials for the equipment which are required to be US-FDA compliance. I have no idea if a manufacturer can declare by themself for FDA compliance of their products or they must receive a FDA conformity certification from an...
  8. LJthien

    Confusion of pressure test statement in BS 1868 for Check Valves

    I am looking to your kind consultation of pressure test requirements which are written in BS 1868 (Chapter-36 Production pressure testing) as quoted below: Quote: All valves shall be pressure tested by the manufacturer before despatch in accordance with BS 6755-1, as below: a) hydrostatic shell...
  9. LJthien

    Quality of Flexible HDPE Conduits melted from the recycled HDPE material

    Upon recently visiting a HDPE pipes manufacturer, I come to know that they also produce Flexible HDPE conduits from recycled HDPE material as an alternative for limited orders and at lower unit price. Referring to IEC 61386-23 or ASTM D3350, I found nothing relating to recycled HDPE material as...
  10. LJthien

    Criteria for defect rate of Junction boxes of PV modules

    I have checked some related standards for this matter but still not get to know. Our Solar Farm has operated for 6 months and we recently found that some Junction Boxes of PV modules (JB) had been bulged. We have investigated and pointed out the root cause that the connection of 1 of 2 JB cords...
  11. LJthien

    Exemption of PWHT for SA537 Cl2 making wed weaker than base metal

    Dear all, I am reviewing my Vendor's WPS and looking to your advice. I understand that ASME VIII-Div1 UCS 56 table exempts from PWHT for SA537 Cl2 of 38mm & below thickness. The Vendor's PQR passed all mechanical tests (impact test at -48C) and both tensile specimens broke at weld metal. The PQR...

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