The file that you checked only shown the changes in the latest revision. The API STD 521 fifth edition, January 2007 (includes errata June 2007), addendum May 2008 has 206 pages. This is the standard that I checked.
The new API STD 521 is the 6th edition,January 2014.
see section 5.15.2.2.2 Vessels containing only gases, vapours or super-critical fluids, pag 42
F' can be determined using equation (9). If calculated using equation (9) and the result is less than 0.01, then use a recommended minimum value of F' = 0.01
I found big discrepancies between our relief valve sizing and the vendor sizing for fire scenario in unwetted vessels when F' is less than 0.01. The discrepancies are based in the version of the API 521 used for the calculation. Our calculation were finalized last year and based in API Std 521...
...vessel/pipe will reach during the blowdown.
To get the right inner wall temperature you must be carefull in hysys with the following information:
* the weight and material of the vessel and piping in contact with the fluid usptream of the restriction orifice.
* minimum ambient temperature...
Thanks to all for your answers:
Our Client finally decided:
1. kept the floating roof tank. These tanks have an internal floting roof.
2. Seal the fixed roof portion of the tanks and pipe the vapor from the tank to a vapor combustion system.
3. Added a refrigeration system to reduce the...
This flow came from the maximum filling rate that you can have in terminal, filling two tanks at the same time. Currently this flow was change for the client to 0.34 MMSCFHr.
Regarding with the type of tanks. I have found several technical information that not recomended floating roof tanks for...
I am working in feasibility study.
We want to change the service of two existing tanks in a storage terminal.
The new product to be handled in the existing tanks will be condensate (light naphta), with a maximum RVP of 15. The current tanks are floating roof.
For the new service these ones...
Finally, as Montemayor said, we will need an air fan cooler in order to get the maximum temperature of 50°C at the outlet.
However we would like to check how many degrees could be
reduced in the system (tank and outlet pipe) without air fan cooler. In the pipe we know how calculated the...
We also think that it is difficult that the temperature will be reduced until 50°C. However we would like to know how many degrees could be reduced.
The personal protection insulation that we will be installed is metal shields instead insulation, the we will improve our heat loss.
Our...
We have this problem.
We are designing a tank that will receive 2200 BPD of foamy oil at 80°C. The inlet nozzle will be located at the top of the tank. Inside of the tank the normal liquid level is 5 feet. This equipment is not insulated; only personal protection insulation is needed, because it...
We have this problem.
We are designing a tank that will receive 2200 BPD of foamy oil at 80°C. The inlet nozzle will be located at the top of the tank. Inside of the tank the normal liquid level is 5 feet. This equipment is not insulated; only personal protection insulation is needed, because...
We are designing a sample connection to be installed in a 2" produced water line. this lines operate in a intermitent service.
Is it possible to install this sample connection without a sample quill?. Pipig group has problems with the installation of quill in small diameter lines. The other...
The most recommended type of vent stacks are vertical design. Additionally it is the most recomended from safety point of view.
If you want a specific design criteria for design the vent see API 521 "Guide for pressure-releiving and depresurization system". A radiation and dispersion study...
Montemayor:
The tower operates with MDEA (55% water) and LPG, liquid - Liquid contactor, at 420 psig and temperatures between 125 and 148°F. The amine is used to remove the H2S in the LPG
In the first estimated when I calculated the possible relief load for pool fire scenario. I get that the...
Where could I find guidelines to design a relief valve (fire case) for a amine-lpg tower (liquid-liquid contactor tower).
I know that the relief valve will open in fire case when there will be vapor in the top. However the relief valve will handle liquid-vapor mix. How can i estimated the...
You need a Quantitative Risk Analysis in order to know all credible scenaries in your plant.
The Quantitative Risk Analysis consists in a systematical evaluation of the facilities, in order to identify any potentially dangerous event and to estimate the damages to exisiting facilities and...
