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  1. SFuller

    Expansion loops OR bellows in pipeline?

    Dear All, Thank you for your opinions and expertise. The message that I am getting from your posts is that the expansion loops are the way to go and that bellows are only used when nothing else will fit. We will re-design the line with a loop in it. Regards, Steve
  2. SFuller

    Expansion loops OR bellows in pipeline?

    Dear All, We are installing a 8" new steam line on site. The line is a branch from the site main header and will contain 7 barg saturated steam. The end points for the line are slightly off-set from each other so there are two 90º elbows in the line with a short section running between them...
  3. SFuller

    Stress cracking corrosion from dichloromethane hydrolysis

    Moltenmetal, Thanks for your help, We are looking at using the Duplex SAF2205 for the pot, the tower and also the overhead condenser. The parts of the system located after the condenser should be cool enough (with distillate sub-cooling) to eliminate the risk of cracking. Also, as you pointed...
  4. SFuller

    Stress cracking corrosion from dichloromethane hydrolysis

    Hi, We are in the process of replacing an obsolete distillation unit on site. One of the requirements for the new unit is that it needs to be capable of recovering a dichloromethane waste stream by atmospheric distillation. The dichloromethane waste stream will contain approximately 0.5% water...
  5. SFuller

    Liquid-liquid centrifugal separator scale-up

    Hi, I am working on scaling up a process from a research lab to pilot plant scale. The process involves continuously separating two liquid phases (aqueous and organic) that are fed as a mixed feed to a centrifugal separator. The separation has been proven to work in a lab unit. My question is...
  6. SFuller

    Steam safety valve - narrow operating margins

    Montmeyor, I should have explained the problem more clearly. As you stated, the set pressure of the relief valve on the steam receiver will have to be equal to the MAWP (or the design pressure if the MAWP is not know) of the receiver. In this case the set pressure of the valve will be 8.0 barg...
  7. SFuller

    Steam safety valve - narrow operating margins

    Our site has recently increased the set pressure of the relief devices on our steam boilers from 7.9 barg to 8.4 barg. This was done to allow the hardwired high pressure trip setting on the boilers to be increased, preventing the boilers from nuisance trips due to sudden drops in steam demand...
  8. SFuller

    Glycol/water refrigerant properties

    I am looking at modifying a heating cooling loop on an old section of process plant. The plant uses a 50:50 by weight mix of ethylene glycol and water as a heat transfer fluid. We dont have any data on the transport or thermodynamic properies of this mix as most our new units are running on...

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