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  • Users: Luuk21
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  1. Luuk21

    Water properties Aspen Plus are off

    Hi, I have this annoying problem I'm unable to solve. When I add Water as a component in Aspen (CAS 7732-18-5) and run a Pure-property analysis, the Cp (specific heat capacity) is well off. Where it should be around 4.2 from 0 to 100 degC, its going from 4.0 to 4.5. I used different property...
  2. Luuk21

    Fire protection -> heat up time untill critical temperature.

    Hi, I have the following problem; We have certain big lines (DN100 till DN250) that are not fire protected (they are insulated but not fire proof). When a fire occurs and the fluid is heated up to 100 degrees Celcius, a chemical reaction could (theoretically) take place. During the fire it is...
  3. Luuk21

    Unit conversion Cv to Kv

    Hi, I'm having some trouble converting a Cv (imperial) formula to a formula that can be used for Kv (metric). It concerns a Cv calculation for a gas flow trough a control valve. The formula is: Cv = [Qg * (SpGrg * T)^0.5] / [1360 * ([P1 - P2]*P2)] This is for sub critical flow. Cv = capacity...
  4. Luuk21

    Vapor relief Low-Pressure storage tank API-2000

    Hi, I have a question regarding the calculation of the required capacity for a Low-Pressure storage tank, using API-2000. I'm using the 5th edition of API-2000, we don't have the newer ones available. The case is that 100 m3/h liquid ethanol is pumped into an ethanol storage tank, displacing...
  5. Luuk21

    Piping backpressure included in sizing pressure for relief, API520

    Hi, I'm a bit confused about the impact of pressure drop (inlet & outlet) on the Relieving Pressure (P1 as defined in API520, chapter 5.4). Chapter 5.4 API states that P1, the pressure that is used in the formula to calculate A relief, is equal to the Set Pressure + the allowable overpressure...

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