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  1. scorer

    Pressure rating of ANSI 150 304 system at 120degC

    Dear All Thanks for the advice. Kind regards Scorer
  2. scorer

    Pressure rating of ANSI 150 304 system at 120degC

    Dear All I hope that one of the materials experts may be able to help me. One of our piping specifications uses 304 StStl ANSI 150 flanges (or more accurately ASME B16.5 A182-F304) Our spec states that it is rated for 17.0barg pressure at up to 120degC. My question is how do we get the...
  3. scorer

    Working downstream of a rupture disc.

    Thank you for the replies. In this case we have diverted the relief discharge line to a different area - away from the working area. It doesn’t go to abatement, but it’s better than directing it to an area where there are sure to be people working. Perhaps you could help me from a design...
  4. scorer

    Working downstream of a rupture disc.

    From a safety point of view, how do we best manage working on (breaking into) the vent line downstream of a rupture disc or pressure safety valve. The application in question is on storage of a toxic liquid. Multiple tanks have safety devices piped to a common abatement device (wet...
  5. scorer

    Vacuum pump - flammable atmosphere

    Thank you for the info. 25362, do you know what the source is for the fact that flames don't propagate below 50 mmHga? Can anyone enlighten me on the reason behind this.
  6. scorer

    Vacuum pump - flammable atmosphere

    A bit of a basic post with little detail to start off but here goes. With a vacuum system, how can you estimate if there is a flammable atmosphere inside the vac pump. I imagine it's a case of calculating flow rate of flammables removed, and amount of air leakage into the system. Then...
  7. scorer

    Distillation temp probe

    Dear All We have a small packed column with id 750mm. Can someone please recommend how far into the column the temperature transmitter pockets should extend into the packed sections. I would think the further they go in, the more the disruption to the liquid flow down the column (more...
  8. scorer

    Static - grounding

    25362 Thanks for the references. They are an excellent read.
  9. scorer

    Static - grounding

    At work we insert an earthed grounding rod - in through the top of a plastic IBC (1 tonne plastic contaiber) when filling flammable materials through the top. Why is this done, and what is the benefit? It seems to me that it is the liquid itself that is being grounded to prevent a spark...
  10. scorer

    Scale build up

    Dear All Can anyone pass on some first hand experience of using descaling solutions to remove build up of rust/scale in reactor jackets or heat exchangers. I know that there are proprietary solutions available, but would also like to hear from people who have used more readily available...
  11. scorer

    Storage tank relief - the right way

    Thanks for the replies. My plant consists of a 25m3 reactor which then feeds a number of smaller process tanks in series for mixing, separation etc (size less than 5m3). I was interested in the vent stategy needed for these.
  12. scorer

    Storage tank relief - the right way

    I read this thread and found it very interesting, but how do the rules apply to process equipment eg a series of seperators, mixers or reactors. Can you have a common nitrogen blanket header that links several vessels. In this case there would be just the one conservation valve on the...
  13. scorer

    Steam purge into atm tank

    I am looking at the likely build up in pressure inside an atmospheric storage tank when purging steam into the tank for instance to clean out a transfer line. Assuming 6 barg steam is used through a 1 inch line, then from a choked flow calc, I estimate that the max possible flow of steam is...
  14. scorer

    Selecting type of pump

    Does anyone please know where I can find an idiots guide or chart for selecting the correct type of pump. For instance viscous fluid consider rotary gear, viscous with solids consider rotary lobe, clean fluids conider sealles pumps, high flow or low flow etc. I am not looking at a specific...
  15. scorer

    Type of pump - selection

    Does anyone please know where I can find an idiots guide or chart for selecting the correct type of pump. For instance viscous fluid - rotary gear, viscous with solids - rotary lobe, flammble liquids, high flow or low flow etc. I am not looking at a specific issue, but just some general...
  16. scorer

    Weak sulphuric and chlorides

    Can anybody please help select MOC for stoage tank and pump for 5%wt sulphuric acid with chlorides at 85 degC, atmospheric pressure.
  17. scorer

    Solvent pipeline velocity - bonding

    Hi Could anybody please help me with when to decide if bonding of flanges is necessary for solvent pipework. Ethanol and IPA are the solvents in question. Is there a rule of thumb that if you keep the velocity low enough then no bonding is necessary. Thanks.
  18. scorer

    Insulation of cold pipes

    Glycol is supplied to the jacket at -5 degC. I'm not sure of the dilution. A crust builds up on the inside wall of the tank which reduces the heat transfer. It seems that the amount of heat put in by the recirc pumps is more than can be removed by the jacket. However, will lagging the...
  19. scorer

    Insulation of cold pipes

    Hi We currently pump a slurry from a tank at 3 degC through a bank of tubular filters. Product returns to the feed tank, which has glycol on the tank jacket. Product increases in temp over time despite this cooling. Recently the bank of filters was insulated - the idea being that this...
  20. scorer

    Boiling weak sulphuric

    Can someone please advise me on material selection. The intention is to distil acid wash water consisting of approx 5% isopropanol and approx 5% sulphuric acid. I am currently considering reboiler and column in hastalloy C. The feed tank and recovered isopropanol storage tank also need...

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