I'm a chemical engineer in England, involved with safety integrity assessments for chemical plants. I'm struggling with understanding the meaning of multiplicity, or redundancy, inside modern DCS systems, which is often relevent to these assessments.
We work to BS EN 61511 / BS EN 61508, where...
Hi,
I'm designing a new evaporator as part of a plant modification in the UK. It will replace an existing evaporator that will be too small for the modified process.
The evaporator removes water from organics. It has forced circulation, the external pump pushing a high flowrate of liquid...
Hi,
I need to design a heating / cooling system for a small batch process. Its duty will be to supply alternately heating and cooling to any one of four jacketed vessels, either about 5 kW heat load cooling at -100°C (-148°F), or 10 kW heating at +100°C (212°F), as the batch process progresses...
Please can you point me to information on how to estimate the inertia of a motor from its power, speed, etc, and to tables of data for the same?
Thanks
Hi,
I'm doing a very preliminary specification of a plant that will include a large evaporative closed circuit cooling system. Typically these are treated for corrosion inhibition and legionella prevention with eg phosphates and hypochlorite. I dare say there are lots of proprietary systems, but...
I'm looking at explosion hazards in a formalin plant which burns methanol in oxygen-depleted air. I can't find a flammability diagram between oxygen, nitrogen and methanol. Can anyone point me to one please?
Thanks,
c2sco
Hi,
I work for a small company of chem eng consultants in the UK.
We are sometimes approached to chair and scribe HAZOP meetings from companies abroad, especially in the Far East. Travelling to places like that isn't really our area of work, but I've been wondering if it's possible to do the...
I'm compressing ambient, undried air so that I can sparge it into a tank to aerate the contents. Hence the air could have any RH at inlet conditions, even 100%. I'm also installing a cooler as the compressed air is too hot for my process. At what temperature will my air start to form dew as it...
Now I realise thast volume conversions is a topic discussed at great length in other threads here, but none seem to bump into all of this question. I realise that there are various definitions of "standard" gas conditions around in different industries, especially in the USA (and I suspect that...
Hi folks,
I'm looking at a pipe filling with liquid that has a restrictor orifice in it, part way along but some distance from the pump. The line is initially empty and a pump is started at its inlet end, so the liquid runs along the line, filling it. Just before the liquid meets the RO, it is...
Can anyone offer any practical experience or test data on the likely performance I'll get if I sparge air into a tank containing brine that has dissolved CO2 in it?
::-)
