Prying block type BOG (Boil Off Gas) treatment system of dual-fuel ship

Abstract

The utility model discloses a skid-mounted BOG (Boil Off Gas) treatment system of a dual-fuel ship. The skid-mounted BOG treatment system comprises a BOG main treatment system and an auxiliary system, the BOG main treatment system comprises a BOG preheater, a BOG suction port tank, two compressors, a primary oil-gas separator, a BOG cooler and a secondary oil-gas separator; an inlet of the BOG preheater is connected with a BOG supply port, an outlet of the BOG preheater is connected with an inlet of the BOG suction port tank, and an outlet of the BOG suction port tank is connected with air inlets of the two compressors; outlets of the two compressors are connected with an inlet of the first-stage oil-gas separator; an outlet of the first-stage oil-gas separator is connected with an inlet of the BOG cooler; an outlet of the BOG cooler is connected with an inlet of the second-stage oil-gas separator, and an outlet of the second-stage oil-gas separator is connected with an inlet of a gas user pipeline on a ship. The auxiliary system comprises a heat exchange medium system and a lubricating oil circulation system. According to the utility model, the cost can be reduced, and the BOG treatment efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pry block type BOG treatment system of dual-fuel ship. BACKGROUND

[0002] With the improvement of global environmental protection requirement, the use of new fuel of ship begins to be widely adopted, especially the use of liquefied natural gas (LNG) and liquefied ethane (LEG) fuel. Due to the low-temperature storage characteristics of liquefied gas, the treatment of BOG (BOG, Boil-off gas) is inevitably involved. Since the BOG temperature of methane and propane is very low, the conventional compressor cannot meet the low-temperature working condition of ethane and methane BOG. At present, the Borkhardt piston compressor is widely used in the ship market to meet the low-temperature working condition to treat BOG. There is no other choice, and the cost is particularly high. At the same time, the failure rate and maintenance cost of the piston compressor are relatively high during the later operation. SUMMARY

[0003] The utility model discloses a pry block type BOG treatment system of dual-fuel ship, which can greatly reduce the initial investment cost and improve the efficiency of BOG treatment.

[0004] The utility model discloses a pry block type BOG treatment system of dual-fuel ship, which can greatly reduce the initial investment cost and improve the efficiency of BOG treatment.

[0005] The BOG main treatment system comprises a BOG preheater, a BOG suction tank, two compressors, a primary oil-gas separator, a BOG cooler and a secondary oil-gas separator.

[0006] The inlet of the BOG preheater is connected with the BOG supply port; the outlet of the BOG preheater is connected with the inlet of the BOG suction tank.

[0007] The outlet of the BOG suction tank is connected with the gas inlets of the two compressors; the outlets of the two compressors are connected with the inlet of the primary oil-gas separator.

[0008] The outlet of the primary oil-gas separator is connected with the inlet of the BOG cooler.

[0009] The outlet of the BOG cooler is connected with the inlet of the secondary oil-gas separator; the outlet of the secondary oil-gas separator is connected with the inlet of the gas user pipeline on the ship.

[0010] The auxiliary system comprises a heat exchange medium system and an oil circulation system.

[0011] The heat exchange medium system comprises a BOG pre-heater, a BOG cooler and a lubricating oil cooler; one way of the heat exchange medium is connected with the heat exchange medium inlet of the BOG pre-heater, and the other way of the heat exchange medium is connected with the heat exchange medium inlets of the lubricating oil cooler and the BOG cooler respectively, and the heat exchange medium outlets of the lubricating oil cooler and the BOG cooler respectively flow out of the pry block through the medium discharge pipelines;

[0012] The lubricating oil circulation system comprises a primary oil-gas separator, a double lubricating oil filter, two oil pumps, a lubricating oil cooler and a secondary oil-gas separator; wherein,

[0013] The oil discharge outlet of the primary oil-gas separator is connected with the oil inlet of the double lubricating oil filter, the oil discharge outlets of the double lubricating oil filter are connected with the oil inlets of the two oil pumps respectively, the oil discharge outlets of the two oil pumps are connected with the oil inlets of the lubricating oil cooler, the oil discharge outlets of the lubricating oil cooler are connected with the two compressor oil supply main pipes through the temperature control valves respectively, each of the two compressor oil supply main pipes is connected with the bearing oil supply outlet, the screw oil supply outlet and the slide valve loading oil outlet of the corresponding compressor through three oil supply branch pipes respectively, the oil discharge outlet of the secondary oil-gas separator is connected with the suction side of the two compressors respectively, and the slide valve unloading oil outlets of the two compressors are connected with the suction sides of the two compressors respectively.

[0014] The pry block type BOG treatment system of the dual-fuel ship, wherein an electric heater is installed on the primary oil-gas separator.

[0015] The pry block type BOG treatment system of the dual-fuel ship, wherein the treatment system further comprises an instrument monitoring system, which comprises a first temperature gauge and a first pressure gauge arranged at the BOG outlet of the BOG pre-heater, a fifth temperature gauge arranged at the heat exchange medium outlet of the BOG pre-heater, a second temperature gauge and a second pressure gauge arranged at the suction tank, a third temperature gauge arranged at the primary oil-gas separator, a third pressure gauge arranged at the secondary oil-gas separator, a seventh temperature gauge and a seventh pressure gauge arranged at one heat exchange medium inlet pipeline of the lubricating oil cooler, a ninth temperature gauge and a ninth pressure gauge arranged at the other heat exchange medium inlet pipeline of the BOG cooler, an eighth temperature gauge and an eighth pressure gauge arranged at one heat exchange medium outlet pipeline of the BOG cooler, a tenth temperature gauge and a tenth pressure gauge arranged at the other heat exchange medium outlet pipeline of the BOG cooler, an eleventh pressure gauge, a twelfth pressure gauge, a thirteenth pressure gauge and a fourteenth pressure gauge arranged at the inlets and outlets of the two oil pumps respectively, and a differential pressure sensor arranged at the double lubricating oil filter;

[0016] All the pressure gauges, temperature gauges and differential pressure sensors are connected with an external control monitoring system through signal lines;

[0017] The instrument monitoring system is also integrated in the pry block.

[0018] The pry block type BOG treatment system of the dual-fuel ship has the following characteristics:

[0019] 1. The normal temperature compressor is selected, the problem of low temperature resistance of the compressor material of the low temperature evaporation gas is overcome, and the investment cost of the compressor is greatly reduced.

[0020] 2. The pry block type design meets the needs of customers and can be operated in parallel with the ship at the same time, thereby shortening the construction period of the ship, and the pry block production operation can be completed in the workshop, thereby improving the construction convenience.

[0021] 3. The fuel tank evaporation gas is treated and changed into fuel that can be used by the low-pressure engine, the generator and the boiler, fuel is fully utilized, and the safety of the fuel tank is improved.

[0022] 4. The flexibility of the fuel tank and the ship pipeline can be better adapted, and the pipeline arrangement is optimized.

[0023] 5. The pry block type structure is suitable for the methane fuel gas supply system and the ethane fuel gas supply system.

[0024] 6. The equipment energy consumption is more saved than the evaporation gas re-liquefaction system. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a principle structure diagram of the pry block type BOG treatment system of the dual-fuel ship of the utility model;

[0026] Fig. 2 is a perspective view of the pry block type BOG treatment system of the dual-fuel ship of the utility model;

[0027] Fig. 3 is a device arrangement perspective view of the pry block type BOG treatment system of the dual-fuel ship of the utility model. DETAILED DESCRIPTION

[0028] The utility model will be further described in combination with the drawings.

[0029] Please refer to Figs. 1 to 3 The pry block type BOG treatment system of the dual-fuel ship of the utility model comprises a BOG main treatment system, an auxiliary system and an instrument monitoring system integrated in a cuboid frame type pry block.

[0030] The BOG main treatment system comprises a BOG pre-heater 6, a BOG suction tank 4, two compressors 1, a first-stage oil-gas separator 5, a BOG cooler 7 and a second-stage oil-gas separator 8.

[0031] The inlet of the BOG preheater 6 is connected to the BOG supply end via the first BOG pipeline 101; the BOG outlet of the BOG preheater 6 is connected to the inlet of the BOG suction can 4 via the second BOG pipeline 102; the outlet of the BOG suction can 4 is connected to the inlet of two compressors 1 via a BOG outlet pipe 103 and two BOG inlet pipes 104 and 105; the outlets of the two compressors 1 are each connected to the inlet of the first-stage oil-gas separator 5 via compressor exhaust pipes 106 and 107; the first-stage oil-gas separator... The outlet of BOG 5 is connected to the inlet of BOG cooler 7 via BOG cooling pipe 108; the outlet of BOG cooler 7 is connected to the inlet of secondary oil-gas separator 8 via BOG pipe 109, and the outlet 8 of secondary oil-gas separator 8 is connected to the inlet of the ship's gas user pipeline via BOG output pipe 110; a check valve V11 and a pressure control valve V12 are installed on BOG output pipe 110, and a BOG bypass pipe 111 is installed between the check valve V11 and the pressure control valve V12 and between the return port of BOG suction tank 4. The compressor slide valve control solenoid valve 14 is used to control the amount of lubricating oil in the slide valve, thereby adjusting the compressor's displacement.

[0032] The working process of the BOG main processing system is as follows:

[0033] 1. BOG enters the BOG preheater 6 through the first valve V101 on the first pipeline 101, preheating the low-temperature BOG to the required temperature at the inlet of the ambient temperature compressor 1. Then, it enters the BOG suction tank 4 through the second valve V02 and the third valve V03 on the second pipeline 102. The first valve V01 has an ESD function (pneumatic emergency shut-off function) and operates according to the corresponding system signal.

[0034] 2. The heated BOG is temporarily stored in the BOG suction tank 4, which is used to maintain stable suction pressure and perform gas-liquid separation. When the BOG flow rate is low, any one compressor 1 can be started. When the BOG flow rate is high, two compressors 1 can be started simultaneously to process the BOG. ​​Compressor 1 is a room temperature single-stage screw compressor connected to compressor motor 3 via coupling 2. This compressor 1 can compress the BOG to 16 kg, which can meet the intake air requirements of the ship's low-pressure main engine.

[0035] 3. After heating, the BOG passes through the outlet of the BOG suction tank 4 and sequentially through an outlet pipe 103 and two compressor inlet pipes 104 and 105 to the two compressors 1. Each of the two compressor inlet pipes 104 and 105 is equipped with a manual isolation valve V04 and V06 to control which compressor 1 the BOG is compressed in. The manual isolation valves V04 and V06 are equipped with open and closed indicators to facilitate the crew to identify the valve opening and closing status. Each of the two compressor inlet pipes 104 and 105 is equipped with a Y-type filter V05 and V07 to prevent impurities in the BOG from entering the compressor 1 and thus affecting the lifespan of the compressor 1.

[0036] 4. After being compressed by compressor 1, the BOG enters the first-stage oil-gas separator 5 through compressor discharge lines 106 and 107 for oil-gas separation. Control valves V08 and V09 installed on compressor discharge lines 106 and 107 are used to select which compressor 1 is in operation. Control valves V08 and V09 are equipped with open / closed indicators to facilitate crew identification of the valve's open / closed status.

[0037] 5. The compressed BOG enters the baffle plate type primary oil-gas separator 5 for oil-gas separation to remove oil from the evaporated gas.

[0038] 6. The compressed BOG is at a high temperature and needs to be cooled to 45°C to reach the gas user's intake temperature. BOG cooling is achieved through BOG cooling pipe 108, and valve V10 installed on BOG cooling pipe 108 is used to control the flow of the high-temperature compressed BOG into BOG cooler 7.

[0039] 7. The BOG cooled by the BOG cooler 7 enters the secondary oil-gas separator 8 through the BOG pipeline 109, where it undergoes further oil-gas separation. Then, it is delivered to the gas users on board through the BOG output pipeline 110. The check valve V11 installed on the BOG output pipeline 110 is used to prevent gas from flowing back into the BOG main processing system when the gas user exits the gas usage mode. The regulating valves V13 and V14 installed on the BOG bypass pipeline 111 are used to balance the pressure of the BOG processing system.

[0040] The auxiliary systems include a heat transfer system and a lubricating oil circulation system;

[0041] The heat exchange medium system includes a BOG preheater 6, a BOG cooler 7, and an oil cooler 9. The heat exchange medium is water-glycol. One path of the heat exchange medium connects to the heat exchange medium inlet of the BOG preheater 6 via valve V201 on the first medium supply pipeline 201, and the heat exchange medium outlet of the BOG preheater 6 is discharged from the skid via valve V202 on the first medium outlet pipeline 202. Another path of the heat exchange medium connects to the heat exchange medium inlet of the oil cooler 9 via valve V203 on the second medium supply pipeline 203, and the heat exchange medium outlet of the oil cooler 9 is discharged from the skid via valve V204 on the second medium outlet pipeline 204. A third path of the heat exchange medium connects to the heat exchange medium inlet of the BOG cooler 7 via control valve V205 on the third medium supply pipeline 205, and the heat exchange medium outlet of the BOG cooler 7 is discharged from the skid via valve V206 on the third medium outlet pipeline 206.

[0042] The lubricating oil circulation system includes a primary oil-gas separator 5, a dual lubricating oil filter 11, two oil pumps 10, a lubricating oil cooler 9, and a secondary oil-gas separator 8; among which,

[0043] An electric heater 13 is installed on the primary oil-gas separator 5. The oil outlet of the primary oil-gas separator 5 is connected to the oil inlet of the double lubricating oil filter 11 through an oil outlet pipe 211. The oil outlet of the double lubricating oil filter 11 is connected to the oil inlet of two oil pumps 10 through two oil outlet pipes 212 and 213 respectively. The oil outlets of the two oil pumps 10 are connected to the oil inlet of the lubricating oil cooler 9 through oil pipes 214, 215 and 216 respectively. A one-way valve V214 and a ball valve V21 are installed on the oil pipe 214. 5; A one-way valve V216 and a ball valve V217 are installed on oil pipe 215; the oil drain port of the lubricating oil cooler 9 is connected to the oil inlet of the two compressors 1 through two compressor oil supply mains 220 and 221, and solenoid valves V218 and V219 are installed on the two compressor oil supply mains 220 and 221, respectively; one compressor oil supply main 220 supplies oil to the bearings, screws and slide valves of the corresponding compressor 1 through three oil supply branch pipes 231, 230 and 222, respectively. For oil supply, valves V227, V226, and V223 are installed on three corresponding oil supply branch pipes 231, 230, and 222; another compressor oil supply main pipe 221 connects to the bearing oil supply port, screw oil supply port, and slide valve loading port of the corresponding compressor 1 through three corresponding oil supply branch pipes 233, 232, and 224, with valves V229, V230, and V221 installed on each of the three oil supply branch pipes 233, 232, and 224; the secondary oil-gas separator 8... Each of the two compressor 1's oil outlets is connected to the suction port side of the two compressors 1 through oil outlet pipes 229 and 234 respectively; the oil outlet of the two-stage oil-gas separator 8 is connected to the unloading oil port of the two compressors 1 through oil supply pipes 223 and 225 respectively; the slide valve venting oil port of the two compressors 1 is connected to the suction port side of the two compressors 1 through unloading oil lines 227 and 228 respectively; control valves V231 and V232 are installed on the unloading oil lines 227 and 228 respectively.

[0044] Before starting the compressor 1, it is necessary to ensure that the lubricating oil system is operating normally. In order to ensure the normal start-up of the compressor 1 during initial start-up or after a period of shutdown, an electric heater 13 is installed on the first-stage oil-gas separator 5 to preheat the lubricating oil. The bottom of the first-stage oil-gas separator 5 is provided with a drain port to discharge excess or waste medium in a timely manner. The side wall of the first-stage oil-gas separator 5 is provided with a filling port to replenish the lubricating oil in a timely manner, and an oil level sight glass is provided to observe the consumption of lubricating oil in the system.

[0045] The isolation solenoid valve V220 controls whether the lubricating oil system isolates the compressor 1 from circulation. After compressor 1 starts, the isolation solenoid valve V220 closes. The temperature control valve 12 regulates the flow of the lubricating oil system and the flow rate of lubricating oil to the lubricating oil cooler 9. The compressor slide valve control solenoid valve 14 controls the amount of lubricating oil in the slide valve, thereby regulating the displacement of compressor 1. The dual lubricating oil filter 11 filters impurities in the lubricating oil system, preventing impurities from entering compressor 1 and aggravating its wear. The dual lubricating oil filter 11 is equipped with a differential pressure gauge to monitor filter blockage. Two oil pumps 10 lubricate the two compressors 1, ensuring their normal operation. The two oil pumps are redundant; when one oil pump 10 is in use, the other is in standby, improving system safety. The secondary oil-gas separator 8 further filters the lubricating oil in the fuel gas delivered to the user, while preventing oil-gas mixture from entering the fuel tank during the warm-up operation of compressor 1 using high-temperature gas. The lubricating oil cooler 9 cools the lubricating oil, facilitating efficient circulation.

[0046] When the oil temperature in the lubricating oil system does not reach the required temperature of the compressor 1, the circulation mode of the lubricating oil system is as follows: any oil pump 10 draws lubricating oil from the first-stage oil-gas separator 5 through the oil discharge pipe 211 and the oil outlet pipe 212 or 213, passes through the double lubricating oil filter 11 and enters the oil pump 10, and then flows through the pipelines 214 or 215, 216 and through the temperature control valve 12, sequentially through the pipelines 218, 219 and the isolation solenoid valve V220 and returns to the oil-gas separator 5.

[0047] After the compressor 1 is running normally, the oil pump 10 pumps out lubricating oil, which then passes through the lubricating oil cooler 9 and the temperature control valve 12, and enters either of the compressor oil supply mains 220 or 221 respectively; the valves V218 or V219, which are installed on the two compressor oil supply mains 220 and 2212 respectively, are used to select the destination of the lubricating oil.

[0048] The instrument monitoring system includes:

[0049] The first temperature gauge T1 and the first pressure gauge P1 at the BOG outlet of the BOG preheater 6 and the fifth temperature gauge T15 at the heat exchange medium outlet of the BOG preheater 6 are used to output signals to the control and safety system.

[0050] The second temperature gauge T2 and the second pressure gauge P2 installed on the suction tank 4 are used to output signals to the control and safety system.

[0051] A third temperature gauge T3 is installed on the first-stage oil-gas separator 5 to monitor the oil temperature;

[0052] A third pressure gauge P3 is installed on the secondary oil-gas separator 8 to monitor the pressure;

[0053] The fourth temperature gauge T4 and the fourth pressure gauge P4, installed on the BOG output pipeline 110, are used to monitor the temperature and pressure of the BOG supplied to the gas-consuming equipment.

[0054] The seventh temperature gauge T7 and the seventh pressure gauge P7 are installed on one heat exchange medium inlet pipe 203 of the lubricating oil cooler 9, and the ninth temperature gauge T9 and the ninth pressure gauge P9 are installed on another heat exchange medium inlet pipe 205 of the BOG cooler 7, to monitor and indicate the supply temperature and pressure of the heat exchange medium (water glycol).

[0055] The eighth temperature gauge T8 and the eighth pressure gauge P8 are installed on one heat exchange medium outlet pipe 206 of the BOG cooler 7, and the tenth temperature gauge T10 and the tenth pressure gauge P10 are installed on another heat exchange medium outlet pipe 204 of the BOG cooler 7, to monitor and indicate the discharge temperature and pressure of the heat exchange medium (water glycol).

[0056] Eleventh pressure gauge P11, twelfth pressure gauge P12, thirteenth pressure gauge P13, and fourteenth pressure gauge P14 are respectively installed at the inlet and outlet of the two oil pumps 10 to detect the pressure of the oil pumps 10.

[0057] The lubricating oil system pipeline has a fifth temperature gauge T5, a sixth temperature gauge T6, a fifth pressure gauge P5, and a sixth pressure gauge P6. When the oil temperature is low, the isolation solenoid valve V220 is activated; when the oil temperature is normal, the solenoid valve V218 or V219 is activated.

[0058] A differential pressure sensor is installed on the dual lubricating oil filter 11.

[0059] All pressure gauges, temperature gauges, and differential pressure sensors installed inside the skid are connected to an external control and monitoring system via signal lines.

[0060] The skid frame uses square steel and profiles as the base material, which is readily available and easy to manufacture. Lifting lugs are installed at the top of the four corners of the frame for easy hoisting and assembly. An oil collection tray is installed at the bottom of the skid to maintain the lubricating oil and heat exchange medium (water glycol) that may leak from the system, and the collection tray is equipped with a drain plug.

[0061] All pressure gauges, temperature gauges, and pressure sensors within the skid are centrally located on the sensor plate 14 and temperature monitoring plate 15, and in the corresponding junction box 16, at approximately the same height as a person's line of sight, conforming to ergonomics and facilitating personnel observation. The start button 17 within the skid is positioned close to the operating equipment for easy observation during start-up and shutdown.

[0062] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A skid-mounted BOG treatment system for a dual-fuel vessel, comprising a main BOG treatment system and an auxiliary system integrated within a rectangular frame skid; characterized in that, The BOG main processing system includes a BOG preheater, a BOG suction tank, two compressors, a primary oil-gas separator, a BOG cooler, and a secondary oil-gas separator; wherein... The inlet of the BOG preheater is connected to the BOG supply port; the outlet of the BOG preheater is connected to the inlet of the BOG suction can. The outlet of the BOG suction can is connected to the air inlet of the two compressors; the outlet of the two compressors is connected to the inlet of the first-stage oil-gas separator. The outlet of the primary oil-gas separator is connected to the inlet of the BOG cooler; The outlet of the BOG cooler is connected to the inlet of the secondary oil-gas separator, and the outlet of the secondary oil-gas separator is connected to the inlet of the gas user pipeline on the ship. The auxiliary system includes a heat exchange medium system and a lubricating oil circulation system; The heat exchange medium system includes a BOG preheater, a BOG cooler, and a lubricating oil cooler; wherein, one heat exchange medium is connected to the heat exchange medium inlet of the BOG preheater, and the other heat exchange medium is connected to the heat exchange medium inlet of the lubricating oil cooler and the heat exchange medium inlet of the BOG cooler respectively; the heat exchange medium outlet of the lubricating oil cooler and the heat exchange medium outlet of the BOG cooler each flow out of the skid through a medium discharge pipeline. The lubricating oil circulation system includes a primary oil-gas separator, a dual lubricating oil filter, two oil pumps, a lubricating oil cooler, and a secondary oil-gas separator; wherein... The oil outlet of the primary oil-gas separator is connected to the oil inlet of the dual lubricating oil filter. The oil outlet of the dual lubricating oil filter is connected to the oil inlets of two oil pumps. The oil outlets of the two oil pumps are connected to the oil inlet of the lubricating oil cooler. The oil outlet of the lubricating oil cooler is connected to the two compressor oil supply mains via a temperature control valve. Each compressor oil supply main is connected to the corresponding compressor's bearing oil supply port, screw oil supply port, and slide valve loading port via three oil supply branch pipes. The oil outlet of the secondary oil-gas separator is connected to the suction side of the two compressors. The slide valve venting ports of the two compressors are connected to the suction side of the two compressors one-to-one.

2. The skid-mounted BOG handling system for dual-fuel ships according to claim 1, characterized in that, An electric heater is installed on the primary oil-gas separator.

3. The skid-mounted BOG handling system for dual-fuel vessels according to any one of claims 1 or 2, characterized in that, The processing system also includes an instrument monitoring system, which includes a first temperature gauge and a first pressure gauge installed at the BOG outlet of the BOG preheater; a fifth temperature gauge installed at the heat exchange medium outlet of the BOG preheater; a second temperature gauge and a second pressure gauge installed on the suction tank; and a third temperature gauge installed on the primary oil-gas separator. The third pressure gauge is installed on the secondary oil-gas separator; the seventh temperature gauge and the seventh pressure gauge are installed on one heat exchange medium inlet pipe of the lubricating oil cooler; the ninth temperature gauge and the ninth pressure gauge are installed on the other heat exchange medium inlet pipe of the BOG cooler; the eighth temperature gauge and the eighth pressure gauge are installed on one heat exchange medium outlet pipe of the BOG cooler; the tenth temperature gauge and the tenth pressure gauge are installed on the other heat exchange medium outlet pipe of the BOG cooler; the eleventh pressure gauge, the twelfth pressure gauge, the thirteenth pressure gauge, and the fourteenth pressure gauge are installed at the inlet and outlet of the two oil pumps respectively; and the differential pressure sensor is installed on the dual lubricating oil filter. All pressure gauges, temperature gauges, and differential pressure sensors are connected to an external control and monitoring system via signal lines. The instrument monitoring system is also integrated into the skid.

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