₦airaland Forum

lobito007:
Bro, do your research adequately before posting here so as not to mis-educate people. To start with, liquids can be compressed due to the weak inter-molecular forces between them. 2: four-stroke engines could be of diesel or gasoline. The difference is that in a diesel, combustion occurs by just compression of the fuel-air mixture. In a gasoline engine, combustion occurs via spark plugs. This is why diesel engines are said to have a higher thermal efficiency than gasoline engines. The heat generated during compression alone is enough to bring about combustion.

Olumosey:
Any clue on hw 2 interprete piping n instrumentatn diagrams(P&ID).

babacha:
So if a pressure relief valve are mounted to remove excess pressure that may build up due to any reason and keep the flow rate within a safe working operation, then the valve is not only acting as a safety valve but also as a flow regulator because absent of it will increase the pressure and when pressure increase, flow also increase

babacha:
We all are learning, am still a boy in the oil and gas and I be boy for where u dey. If my experience in the oil and gas where to above 5years, I would have apply for EH like u, we still need ur contribution here,we are only sharing idea and we learn from each other. But don't see us as those just talking from what we read in book, some of us are working in the oil and gas sector too

babacha:
We are talking about the use of valve and u said they don't stop and start flow and I explain to u how they stop and start flow, tanker discharge petroleum product at the filling station by gravity, is that domestic use? Visit tank farm and see more flow by gravity
Note also that temperature increase the pressure in pipeline, especially if the pipeline carry PMS


My guy oil and gas is wide, try understand what happen in the upstream, midstream and the downstream, don't limit ur explanation to only the upstream cos NNPC operate in all the streams

babacha:
When u remove excess pressure along a line such that the flow remain constant, what are u regulating? And that is what pressure relief valve does, it regulate flow.

If I have product stored in a tank such that the product flow out by gravity and I close the valve along the line in which the product fow out, what have the valve done? It stop the flow and when I open the valve, it start the flow again. I don't need pump to stop and start flow under gravity, is valve that does that

For more information on valve, check shell SITP training material, u will see the 3 things I mention

babacha:
To throw more light.
1, under those that stop and start flow, u have valve like gate valve, butterfly valve, ball valve etc
2, Under those that regulate flow, u have the pressure relief valve and they are usually spring loaded, the spring is design with a certain pressure in view. When the pressure on the line exceed what the spring can hold, it pushes the spring and the valve open for some fluid to flow out of the line to regulate the pressure.
3 under those that stop back flow, u have the check valve

babacha:
You do not use valves to stop and start flow, pumps are used to stop and start flow. When you use valves to stop flow in a stream, it creates back pressure on the line.

Check valves are designed to stop back flow in operation. Not all valves prevent back flow.

Yeah, control valves regulate flow

That is good but they do more than that. The do basically 3 things
1, To stop and start flow
2, To regulate flow
3, To stop back flow

Let some one bring question too na