Hello all, we are shutting down our vacuum distillation unit for a planned turnaround. This is the first time we are shutting down the unit after it was commissioned. I would like to ask from your various experiences which method is more preferable to empty the tower. Can we use the bottom pump...
Dear Dhurjati Sen, The Al Cladding on the debutanising column melted. Is there a risk that the metallic structure of the column has been affected thus the column might be replaced? just curious to know.Our hope is that no column was affected. For now detail inspection has not started.
Dear mkk3223, fortunately nobody was hurt in the incident. some separation drums and their platforms will be demolished. any experience on how to completely make these equipments hydrocarbon free before dismantling them?
Dear all, the refinery were I work had a fire incident that completely burn down the crude distillation unit, LPG unit, Light and heavy naphta splitting units. For now, detail inspection has not been done to evaluate the integrity of the main equipements like the distillation columns, lines...
dear all, for now all the fingers are pointing towards the state of the cationic resins. the high pressure drop is exclusively on the cationic drum. The anionic drum is OK. we have planned to shut down the cationic drum on thursday and open it for possible sieveing and top up of the resins.Will...
ashtree
1- The normal upstream is 3bars. This gives a flowrate between 25- 30 m3/h. Presently, the upstream is 6bars but the flow rate is about 12m3/h
2-No. The rise in pressure has been sudden
3- All the control valves have been checked. No blockage from them either
4-No built in flow limiting...
Hello all, I have a demineralisation chain with a production cycle of 300m3 in 12 hours(25m3/hr). The demineralisation unit is made up of a cationic and anionic ion exchangers. We use hydrocloric acid and Sadium hydroxide solutions for regeneration.
Over the past 2 days, we have encountered a...
Thanks all for your various contributions. They will help me to prepare the meeting with the engineering company. I thought about the losses from the degasser as well but I think the estimation is far on the high side.
: 1) The degasser is packed tower bed.
2) There are 3 demineralization...
Hi all, we have just received FEED documents from a new demineralization unit we intend to buy. The demineralization chain is made up of a Carbon filter, Cationic drum, CO2 degasser, Anionic Drum and a mix bed drum to complete the demineralizing process. In the documents, it is stated that, the...
we isolated the scrubber and discovered that it was filled with different crystal blocks. This created preferential passages in the drum. we washed the scrubber and it`s now back in service.
We carry out "Doctor Test" on butane at the exit of contactor. The test was positive. The problem is, the test use to be positive when the concentration of NaOH is around 11%. But presently the test is positive when the concentration is above 20%. The quality and flow rate of butane is the same.
Hello All, I have a caustic soda scrubber (NaOH) to eliminate mercaptanes from butane. It is a batch. The concentration of NaOH at the begining of run is 30%. The solution usually gets spent when the concentration is around 10%. Recently, we discovered that, the NaOH solution gets spent when...
Dear All, Recently a small furnace for the hydrotreatment unit was upgraded. The specific consumption changed from 20kgst/t to 14kgst/t. I would like to evaluate the return of investment from this upgrade. How do we convert kgst/t to kg/t. The combustible is fuel oil. The PCI is 9856 kcal/kg...
Dear All, am working as operations engineer of an atmospheric distillation unit. Recently, the water content of light and heavy gasoil coming out from their respective coalescer drums gave a value of 0.1% for a maximum value of 0.05%. I reduced the stripping ratios of the 02 gas oils by half...
Dear All, I am presently monitoring 2 boilers with a pressure of 17 bars . The pH of the boiler waters has falling to below 10.5. I will like to note that the pH of the make up water is about 9.2, that of the feed water is 9.5. A phosphate agent is added to the feed water on its way to the...
Dear All, I am presently monitoring 2 boilers with a pressure of 17 bars . The pH of the boiler waters has falling to below 10.5. I will like to note that the pH of the make up water is about 9.2, that of the feed water is 9.5. A phosphate agent is added to the feed water on its way to the...
Answers to bimr questions:
- The source of raw water is well water
- I don`t know what colloid silica is. What I know is that, the silicate concentration rate is between 24 to 31 mg/l.
- The demineralised water is used in a refinery for turbines, stripping, etc.
- The resin of unit 1 is more of...
