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Hello, Does anyone have a good spreadsheet tool for managing interfaces on plant build projects? I'm looking after project engineering for ~10 greenfield projects at varying stages from concept, through FEED to construction and need a nice clean way of keeping track of all interfaces between...

Good Afternoon Good Sirs and Madams of the PSV world. I have two questions relating to relief design to ask the forum. 1) For vessels operating on high fouling service (for example, coke in say a coker or a cracker) can anyone recommend some design techniques to prevent fouling on the PSV...

Hi All, I am completing a study on the potential for connecting an existing CHP plant, which supplies power locally to my site, to the national grid to sell surplus power to the grid. I simply need to know what new infrastructure I would need to install to make this connection. - Do I need to...

Thanks for the advice all. Yes it was VOC adsorption exothermic process. Problem was that the gas flow was too low and thus it overheated. Solution was to maintain a high enough gas flow to cool / remove the heat of adsorption by the mass of gas itself. The scientist describes what is; the...

Hi Gents, Thanks for the responses. The whole plant operates below 1barg & fluids are above auto-ignition therefore cold vent not an option. I have designed a quench system to kill the heat from the relief streams during an event and prevent fire. It was more out of interest I was wondering at...

Hi, Does anyone know what the cut off point is when a facility needs to have a flare to deal with relief events? Obviously small plants do not need a flare because the relief load is low, but where is that cut off point. Regards The scientist describes what is; the engineer creates what never...

Hi, Does anyone have experience of substances which can react exothermically with Activated Carbon? For example, when scrubbing a multicomponent gas through an AC filter at ambient temp, the temp of the carbon bed starts to rise rapidly. Regards PR The scientist describes what is; the...

Thanks again, that's really helpful. The set pressure of the RPRVs will be 1barg, so it will be a fine balance for me in terms of meeting minimum N2 requirements and not exceeding back pressure limits of the safety valves. Do you know what guidance the deflagration pressure rating information...

Hi georgeverghese, Thanks for that. I've had a look at rupture pin technology on line and it looks good. Are they full orifice devices? The advertise as being good for slurry & solid service so could be a winner. You say they can be re-seated remotely, I assume this means the operator has to...

Hi All, I have an inerted vessel which normally contains a dry solid powder at above its auto-ignition temperature. The current design is a bursting disc only, vent goes to atmosphere at ground level. This will obviously catch fire as soon as it relieves so we want to change the system to...

Compositepro, Gas leaves furnace @ 400C> Gas blown back into mixing chamber upstream of furnace @ 400C ENERGY ADDED via combustion of SEPARATE fuel and air stream to raise mixed gas to 600C Gas leaves furnace @ 400C Repeart Please tell me how that is silly? It's using the recirculated gas as a...

Hi Compositepro, Not perpetual motion, as heat & flow will be added from the burner, just less than at present. And excess flue gas will be bled through the chimney. I'll look into those options. Mine's is an unconventional application, and as such I don't have the luxury to use typical heat...

The oxygen supplier to the flame per moles of natural gas won't be changing as the re-circulation stream will enter downstream of the flame. I must not have been so clear in my description. Yes we will need to re-tune the furnaces to a certain degree, hopefully only on the automation side...

Hi KoachCSR, Apologies, I didn't know about the double post faux pas, thought I might reach a different audience there. Deleted now. Thanks for your response here, interesting and helpful. The reason we have a problem with high gas consumption is that we are using ambient 'dilution' air to...

Hi crshears. It's not a boiler or a steam generator. In an ideal world, yes the system original design should have considered this but unfortunately that was not the case. Now I retrofit to improve. Regards, PR The scientist describes what is; the engineer creates what never was.

Hi All, Does anyone here have experience of recirculating flue gas back into the furnace chamber as a means of heat recovery? The concept is that combustion is only required to raise the exhaust temperature back up to furnace temperature set point, the gas will continuously recirculate with...

Chicopee, I'm not based in the states, based in Europe. This is not an environmental issue, its a product loss issue. Regards, PR The scientist describes what is; the engineer creates what never was.

Thanks folks. I've had a read at the EPA method and it looks like it will work for me. FYI I'm not so interested in filling/offloading losses as the purpose of the calculation is whether or not to insulate the tank for cold conservation so solar radiation of static tank is what I'm most...

Hi All, I need to calculate evaporation losses for an non-insulated Naphtha storage tank in a climate where temperatures can be 35-40C throughout summer. Significant proportion of n-pentane and iso-pentane in the fuel. Would preferably like to use HYSYS for this, the current model I've done...

Hello all, Is it possible to let down compressed gas from a 300barg cylinder to <1barg with a single stage regulator? Its a very low flowrate (20Nm3/hr). If I need an expensive let down skid the concept is stuffed so hopefully its a conventional operation. Cheers, PR The scientist describes...