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  1. davidet68

    Difference in Anods calculation to protect Carbon vs Stainless steel

    Hi, I need to calculate the quantity of anodes to install inside a pressure vessel. Project specifications ask to use a current density of 100 mA/sqm for the kind of water flowing inside the vessel without any indication about vessel material. The vessel shell is Carbon steel and it is...
  2. davidet68

    Sulphuric acid vapours and glavanized steel

    The main pipe is carbon steel with 6 mm of Corrosion allowance, but at the inlet of the basin the pipe will be PTFE to avoid corrosion. The end of the pipe is deep about 500 mm in the water to avoid splashing and weak acid formation.
  3. davidet68

    Sulphuric acid vapours and glavanized steel

    I need to feed Sulphuric acid @98% to neutralize a discharge water in a basin. This concrete basin will be covered with a Carbon steel hot dip galvanized structure. I would like to know if the acid vapours produced inside the basin can cause corrsion problems to the galvanized cover and in this...
  4. davidet68

    Sulphuric acid vapours and glavanized steel

    I need to feed Sulphuric acid @98% to neutralize a discharge water in a basin. This concrete basin will be covered with a Carbon steel hot dip galvanized structure. I would like to know if the acid vapours produced inside the basin can cause corrsion problems to the galvanized cover and in this...
  5. davidet68

    addition of a new layer of rubber lining

    We have performed the sparking test, the hardness test, etc and we have also proposed to extend the guarantee of two more years pointing out that the actual rubber lining is of a good quality and with a thickness of 3.3 mm minimum which is clearly not critically thin. It is obvious that my...
  6. davidet68

    addition of a new layer of rubber lining

    I cleary understand that the better solution is to remove the existing layer and add a new one, but this will cause a big delay in my delivery! Checking the BS 6374 is clear that the requirement of a defined thickness (in my case 4mm) +/- 10% is referred to the rubber sheet before vulcanization...
  7. davidet68

    addition of a new layer of rubber lining

    One of our sub supplier have performed a rubber lining inside two our vessels. The thickness in some points was 3.3 mm instead of the required 4 mm (tollerance +/- 10%). Our client's inspector rejected the vessels and we have proposed to add an additional layer of 2 mm of rubber lining. Our...
  8. davidet68

    sodium hypochlorite freezing point.

    I'm searching a table showing freezing point of sodium hypochlorite with change of concentration. Where could I found such table? Thank You!
  9. davidet68

    pvc resistance at -33¦C

    I have a skid with PVC reinforced with GRP piping. This skid will work at ambient temperature above 0°C but can be stored (before working) in an area where the minimum temperatrue could be -33°C. I know that the materil will became very fragile at -33°C but what I would like to know is if this...
  10. davidet68

    Relief Valves requirement according to ASME

    Thank you for your suggestions, I have alredy decided to instal a little rupture disk on the vent pipe if my client insist to require a relief device. But if someone ask me on which basis I have sized this disk what can I reply? I'm trying to understand this UG-125. Generalblr: you suggest me...
  11. davidet68

    Relief Valves requirement according to ASME

    What I don't understand is that ASME don't state to consider fire in any case, but only as an additional case (UG-125 (c) (2) ... an additional hazard CAN be created by exposure of a PV to fire...). If I don't consider fire a possible hazard, my only source of pressure is pump (my vessel are...
  12. davidet68

    Relief Valves requirement according to ASME

    UG-125 c) states that all PV () shall be protected by a pressure relief device that shall prevent the pressure from rising more than 10% or 3 psi () above the MAWP. Our Pressure vessels are feeded by pumps with a shut off pressure lower than vessels MAWP and no heat imput is foressen from the...
  13. davidet68

    Relief Valves requirement according to ASME

    Thank you for your prompt reply. A RV is required from ASME even if no overpressure is foreseen in our PV? (vessels are indoor and pump shut off pressure is lower than PV MAWP)
  14. davidet68

    Relief Valves requirement according to ASME

    One of our clients pointed out that as per clause No. UG-125 of ASME Sec VIII, Div 1 (see attached), all pressure vessels designed as per ASME, should be provided with relief valves. Is this clause applicable to every vessel? Is there any excheption?
  15. davidet68

    dictionary English/russian

    Is there anyone who can suggest me a good technical English/russian dictionary? Thank You, Davide
  16. davidet68

    Shell MESC for Butterfly valves

    I have asked to my supplier to offer accordingly to the MESC N°, but I would like to find the MESC to know the details of these valves. Now I will insist with my client to have these MESC, but I was interested to know is there is the possibility to find them quickly in internet. What I have...
  17. davidet68

    Sand/Pyrolusite filtration

    I'm suppling filter which have as media a mix of quartz sand and pyrolusite. The pyrolusite supplier says that pyrolusite and sand will remain well mixed during backwashing because they have similar specific weight and granulometry. But I understood that pyrolusite worn out. Do pyrolusite reduce...
  18. davidet68

    Shell MESC for Butterfly valves

    Thank you for your prompt reply. And sorry for my concision. I'm searching for Shell MESC 7757AC and MESC 774030. I've asked to my client to send me these MESC but he takes always a long time to reply so, to speed up my job I'm tring to find these MESC in internet, but, what I've undestood is...
  19. davidet68

    Shell MESC for Butterfly valves

    I'm searching the MESC for butterfly valves. Thank You

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