uyosolo:
@caucasian,r u fightin against flesh nd blood or principalities nd power? U seriously nid help!!! Ur village ppl hv troubled u too much

babacha:
There is question that every one who put experience in his or her CV should expect.

Let all share some idea on it, that question is

Why do u want to leave ur current place of work to join NNPC?

Guys ur idea, no comment is wrong

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

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

sharks776:


I choose to live my current job because I seek bigger challenges with reputable larger organizations.

babacha:


Guy how far, how ur day na?

babacha:


Look at this practical one also

Why is the discharge and suction of a centrifugal pump usually at 90 degree?

U no be english teacher, the questions are suppose to be for english teachere, but if him still need, enough are on the head to drop for him, I don't need to consult any tin to drop them

Gloom:
[ :-


Pressure relief valve and pressure safety valve are both safety valves and not for flow regulation. One is used in liquid application and the other in gas application

babacha:


Diesel engine are usually more stronger and more durable when compare to petrol engine. Diesel engine power stroke are usually more stronger and they can withstand heavy load

prelinctus:
This thread is taking a boring dimension.

babacha:


Guy u too much

babacha:


Guy u too much

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

Gloom:



In a process design, there is what we call operating pressure and maximum allowable working pressure. It is desirable for you to keep your operation within the designed operating pressure. However, pressure build up comes up at times due to improper lining of valves, problem with instrument air that operates SDV. Pressure relief valves are mounted along the spool to prevent the pressure from building up to the maximum allowable working pressure. MAWP is based on the pipe schedule.

In oil and gas operation, you don't usually rely on gravity to push flow. In tank application, you normally have a recycle pump to push the flow. For a wellhead, because the downhole formation pressure is high enough to create desired flow rate, a choke valve and some other valves are used.

You only rely on gravity to drive flow in domestic application.

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

Gloom:



In a process design, there is what we call operating pressure and maximum allowable working pressure. It is desirable for you to keep your operation within the designed operating pressure. However, pressure build up comes up at times due to improper lining of valves, problem with instrument air that operates SDV. Pressure relief valves are mounted along the spool to prevent the pressure from building up to the maximum allowable working pressure. MAWP is based on the pipe schedule.

In oil and gas operation, you don't usually rely on gravity to push flow. In tank application, you normally have a recycle pump to push the flow. For a wellhead, because the downhole formation pressure is high enough to create desired flow rate, a choke valve and some other valves are used.

You only rely on gravity to drive flow in domestic application.

Gloom:


Sorry, am not going to argue with you. We learn everyday. Even with my experience in the industry, I still open up to learning from our vendors. What you read in books are guides to real field realities. Am for EH but I still come to this thread to check on technical contribution I could benefit from.

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

Olumosey:
@ gloom: U r vry correct. PSV n PRV do nt regulate flow, bt release excess pressure 4 safety of personnel n equipments.

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

gbonsquare:
Pls I'm not an English teacher ooo and I'm not forming one.I just like that Ur question as it interest me as a Mechanical Engineer.I want to try providing an answer...
The Suction and discharge at 90degree should be because each turn of d valve is a quarter.so the opening and closing of the outlets is 90degree.

SomBaby:
Good morning peeps...

Please any computer science graduate in the house?...Please let's share ideas...

Abi na only mech eng. guys waka come?

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

lobito007:

Good analysis. However you should note that in a 4-stroke engine, like in a 2-stroke in engine, it is the fuel-air mixture (not only the air) that enters the piston during the intake stroke and is compressed.