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Recent content by zaigrata

  1. zaigrata

    Zoning for Methanol

    Dear Elec17, Your three considerations should be: 1. the bottles are tightly closed 2. kept at room temperature - kept away from heated equipment, etc. 3. the room is relatively well ventilated there should be no worries - it's flammable, but not so dangerous if these basic safety measures are...
  2. zaigrata

    Use in quaternary ammonium salts

    since it's a paste and you will use it as catalyst (?) , as far as I know it's better to use a z-blade mixer. I'm not a specialist though good luck
  3. zaigrata

    Studying - cost of a heat exchanger?

    Hi badyaker, it's the same as dcasto's expression The way this should be solved is: if you are looking to find the cost for heat exchanger B while you already have the cost of heat exchanger A = $ 10 000: cost h.e. B = cost h.e. A (size of B / size of A)^exponent the exponent as a rule of...
  4. zaigrata

    Lang / Hand factors are based on purch. or delivered equipement cost?

    Dear all, Can you please provide confirmation whether the Lang, the Hand and the Wroth factors for preparing cost estimates are based on purchased or on delivered equipment? Various sources suggest differently: +James R. Couper suggests in Perry's Chemical Engineers' Handbook ed. 8 that Lang...

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