This is a PFD of the flushing oil system that shows the entire system of pump seal flushing oil. This is the simplest system with just one cone roof tank and two centrifugal pumps. The pump used in a heavier product such as crude, fuel oil required flushing oil to keep the pump seal clean. Here Ultra-low sulfur diesel is used as flushing oil. I hope the function of the system is clear to you. I will explain to you the OSBL part of the system.
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This is a PFD of the flushing oil system that shows the entire system of pump seal flushing oil. This is the simplest system with just one cone roof tank and two centrifugal pumps. The pump used in a heavier product such as crude, fuel oil required flushing oil to keep the pump seal clean. Here Ultra-low sulfur diesel is used as flushing oil. I hope the function of the system is clear to you. I will explain to you the OSBL part of the system. You can watch these videos. Remember the blackhead on the arrow?
You have learned this in how to read the PFD video. It means Diesel is coming from a different unit. Here you can see the line number. The different company follows different terminology for the line number. But it contains same information such as line size, unit number, commodity code that identify fluid inside the line, circuit number, line sequence number, piping class that gives all detail about piping components and their materials, insulation, and coating requirement.
Here N means there is no insulation. If there is H than hot insulation, C is for cold insulation, A for acoustic reduction, P for personal protection, F for fireproofing.
It also gives information about whether the line is steam trace or electric trace. Normally ET is used for electric tracing and ST is used for steam tracing. We follow this strim. Now, this triangle with line indicates a line break. A line break is the demarcation of the line number change. So, whenever this symbol is used it indicates that from that point onward line number is different. This is the bypass loop for the flow transmitter. You can see that the venturi-type flow transmitter provided in between the two gate valves.
Why did I say it is a venture type flow transmitter? Letters VM indicates the type of flow transmitter. It gives flow indication on the control plane. You can see the connection shown between FT and FI. From the piping point of view, you can see that there is a 25 mm drain valve is given in between the two gate valves. The letter D indicates that it is a drain valve and if it is V than it is a vent valve.
Of course, if it is a vent, it shows on the topside, not on the bottom. The bypass valve is also a gate valve that will remain closed during normal operation. You can see the letters NC which indicates the same. Here you can see the motor-operated butterfly valve. Lots of instruments are shown here. But it is not that complicated.
If you are aware of MOV, you know that it can be operated locally or from the control penal. HS indicates hand switch, with these switches you can put MOV on manual control or remote control that means on panel control. You can also start or stop the valve from the field. The data link indicates this valve is connected to the control panel.
The last two instrument bubbles show the potions of the valve. Next is a drain valve that is located at the lowest point.
This is the spectacle blind with a normally closed configuration. If the dark ring is towards the valve, as in this case, it indicates that solid ring covers and isolates the joint during normal operation.
If the only circle is towards the valve, as shown here, that means the hollow ring is there, and the line is live during the normal operation. Below the drain valve, the funnel is shown. COC means continues oil-contaminated that used to drain hydrocarbon.
The second type of drain is AOC that means an accidentally oil-contaminated system. After a dike wall, there is a pneumatically controlled globe valve is there. You can see the pneumatic line symbol. Like MOV, the pneumatic valve also has various switches to operate the valve locally and from the control panel. You can also see the three-way valve connected to the pneumatic line to operate the actuator.
You can refer to the abbreviation table to understand the meaning of all these instrument bubbles. I have attached this table with a free download. The link is given in the description. It used to protect the actuator from the surge. Main Equipment — Tank Next is a tank. First, I will explain mechanical parts and then instrumentation. As you can see, this is a fixed roof tank. Let see the detail of this tank. The tank is You can also see the operating pressure and temperature of the tank.
The material of construction is carbon steel, and there is no insulation. Now let go back to the tank. N1 to N17 are nozzle numbers. Manholes are shown as M1 to M3. The broken line shows the internal piping. There is a vortex breaker with the N8 nozzle connected to a pump suction line with a Normally Closed gate valve.
This is because the main suction line is N2. N8 will use only when you want to drain the tank completely. This is open type liquid seals that prevent air ingress into the tank.
For safe operation of any equipment, you have to monitor pressure, temperature, and level. Here you can see the Pressure Transmitter near the tank bottom plate. On top of the roof, you can see the radar type level indicator and transmitter. The temperature gauge is shown as TE that is temperature elements. This arrangement shows multiple thermocouples installed at a different height of the tank.
This will ensure that you will get an average temperature of the tank as the liquid has a different temperature at a different level. LZT is a level safety transmitter. LLL protects your pump and when tank level reached to LLL, it gave the alarm in control penal and based on the logic configuration it may trigger to switch off command to the pump.
When the liquid level reached the HLL it gives the alarm and when it reached HHLL it will trigger the safety logic and stop the fluid supply to the tank.
There is a breather valve on the tank. It will protect the tank from the overpressure and vacuum. Now, these all instrument bubbles are sending the information to the local and main control panel for the pressure, level and temperature instrument that I have explained to you. You may have noticed that there is a tank gauging system which received the all input signal from the instruments.
The tank gauging system is used to calculate the quantity of the liquid stored in the tank at any given time. Based on the diameter, level, and temperature it will calculate the quantity of the liquid stored in the tank. QI is a quantity indicator. In the last part of this video, let check what is going out of the tank.
AFT from the tank is supplied to the pump with the help of mm pipeline. You can see that inside dike there is a manual gate valve with a bypass arrangement.
There is a safety relief valve on the bypass. Outside the dike, you can see the motor-operated butterfly valve. This MOV has similar switches that I have explained to you earlier to operate the valve locally and from the control panel.
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