CN213754562U

CN213754562U - Multipoint equipment distributed monitoring system for cargo oil loading and unloading operation of oil tanker

Info

Publication number: CN213754562U
Application number: CN202022517457.3U
Authority: CN
Inventors: 陆洋; 左红稳; 肖海瑞
Original assignee: No63686 Troops Pla
Current assignee: No63686 Troops Pla
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-07-20
Anticipated expiration: 2030-11-04

Abstract

The utility model discloses a multipoint equipment distributed monitoring system for cargo oil loading and unloading operation of an oil tanker, which comprises an upper computer, a lower computer, a monitored object, a cargo oil monitoring platform, and a cargo oil chamber industrial personal computer, a communication contact tool and a display and control device, wherein the upper computer and the lower computer are mutually connected by a communication network; the liquid level remote measuring, valve monitoring, pumping and ventilation monitoring and other systems are lower computers and comprise control boxes, field monitoring objects and sensors; the upper computer and the lower computer transmit signals through a communication network; the sensor collects the running state of the on-site monitoring object, sends the measured parameters into the control box, communicates with the industrial personal computer in the cargo oil room and displays the parameters in real time, and when the parameter value exceeds a set limit value, the industrial personal computer in the cargo oil room outputs an alarm signal and carries out safety control; and the cargo oil chamber industrial personal computer transmits the required signal to the centralized control room industrial personal computer, the loading computer and the ship monitoring and alarming system. The system ensures the safety of the oil tanker during loading and unloading operation.

Description

Multipoint equipment distributed monitoring system for cargo oil loading and unloading operation of oil tanker

Technical Field

The utility model relates to a ship engineering technology field, concretely relates to multiple spot equipment distributed monitoring system of oil tanker cargo oil loading and unloading operation.

Background

Unlike other types of ships, an oil tanker is a dangerous goods transport ship and needs to realize safety guarantee of fire prevention, explosion prevention and pollution prevention, so that special requirements are imposed on cargo oil loading and unloading operations. The main conventional matching sets of the cargo oil loading and unloading operation of the oil tanker comprise: cargo oil loading and unloading equipment, cargo oil tank sweeping equipment and special ballast equipment. In addition, other optional accessories are provided: in order to improve the automation level of operation, liquid level telemetering and valve monitoring equipment is generally configured; in order to optimize the safety level of oil tanker transportation and operation, an inert gas system is arranged in the oil tanker, and meanwhile, special fire fighting and water spraying facilities and the like can be equipped; in order to reduce the pollution degree of the ballast water discharge of the oil tanker to the environment, tank washing equipment and an oil discharge monitoring device are arranged in the oil tanker; when carrying heavy viscous oil products such as heavy diesel oil, fuel oil, lubricating oil, residual oil, etc., it is usually necessary to arrange cargo oil heating equipment in the cargo oil tank.

In a medium and small-sized oil product tanker with coastal and inland navigation areas, the oil tanker refunds cargo oil with a dock terminal or a ship of the other party through a pipeline connected with a pipe head of the oil tanker by depending on self loading and unloading equipment, the loading and unloading process not only influences the operation time and the residual cargo oil amount at the end, but also is related to the safety of the unloading equipment and the ship, so that the requirement on the skill of a shipman is higher, the workload of the shipman is more, and the fatigue strength is high.

The safe, reliable and efficient operation of the cargo oil loading and unloading operation of the oil tanker is vital, the loading and unloading equipment and the state of the ship need to be synchronously monitored in the operation process based on the principle, the principle is comprehensively divided into two functions of monitoring and controlling, and the two functions are the basis for realizing the automation and the intellectualization of cargo oil loading and unloading so as to ensure that the oil tanker can successfully convey the loaded oil. A monitoring part: cargo oil tanks (liquid level, temperature), water tanks (liquid level), cargo oil pumps, tank washing pumps, ballast pumps, fire pumps and the like (inlet/outlet pressure, rotating speed, current, bearing and stuffing box temperature), cabin equipment, an oil discharge monitoring device and the like, and analyze, identify and send out an alarm for monitoring parameters; the control part: controlling various valves, pumps, fans and other devices, and automatically sending out control instructions when the dangerous state exceeds the alarm threshold value. The on-site monitoring and control are arranged on the equipment side; the comprehensive core remote monitoring and control is positioned in the cargo oil chamber, and all equipment monitoring points are covered; necessary public alarm points extend to the centralized control room and the ship monitoring alarm system.

From the practical matching, the cargo oil loading and unloading operation system integrates multiple functions of cargo oil loading and unloading, cargo tank sweeping, ballast and the like, and becomes a set of complex large system together with a monitoring system, and becomes a second large equipment system of the ship which is only inferior to the main propulsion device. In recent years, cargo handling operation monitoring systems have been improved in design, production, and practical use. Because pursuit price/performance ratio and market share, adopt centralized monitoring system more, this type of system has some technical defects, is difficult to satisfy needs such as safe being suitable for, simple operation, easy to maintain, mainly has following problem:

1. the monolithic structural design makes installation, manufacturing and maintenance difficult, and is not conducive to technology upgrade and capacity expansion. For example, after the ship equipment is repaired and modified or the technology is upgraded, the cargo oil loading and unloading operation system needs to be changed, and the hardware and software monitoring mode needs to be reconfigured.

2. The overall performance and the control strategy are not perfect enough, the functions of complete state monitoring, fault alarming, diagnosis and automatic processing are mainly lacked, the accident investigation is judged by manual site, the labor consumption is high, the labor intensity is high, the treatment efficiency is low, the time for dealing with the accident is delayed, the misoperation risk is large, and the safety of cargo oil loading and unloading operation is influenced.

3. The ship equipment is numerous in quantity and relatively scattered in position, the centralized monitoring system transmits equipment signals to the centralized control room in a one-to-one mode through cables, the signal transmission distance is long, attenuation can occur, the external interference is easy to cause, the synchronism cannot be guaranteed, and the working reliability of the system is difficult to guarantee. In view of the above, there is a need for an improved cargo handling system to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide a can perfect entire system's technical performance, security performance, economic performance and follow-up maintenance, will correspond functional module and integrate together, realize that multipoint equipment dispersion monitoring, centralized management and cargo oil loading and unloading operation's intellectuality, automation form the multipoint equipment distributed monitoring system of the oil tanker cargo oil loading and unloading operation that the function is strong, the maintenance is easy, the price is low.

In order to achieve the above object, the technical solution of the present invention is to provide a multipoint equipment distributed monitoring system for cargo oil loading and unloading operation of an oil tanker, wherein the system comprises an upper computer, a lower computer, a monitored object and a cargo oil monitoring station which are mutually connected by a communication network;

the upper computer is an industrial personal computer arranged in a cargo oil chamber of the oil tanker, an upper computer communication module and a data processing module are arranged in the industrial personal computer, the data processing module receives monitoring data transmitted by the lower computer through the upper computer communication module, and the monitoring data is analyzed, calculated and processed to show the result on a display;

the lower computer is a monitoring signal acquisition unit which is arranged in the control box and converts the state parameters of the monitored object into electric signals, and the collected electric signals are transmitted to the upper computer through the lower computer communication module;

the communication network is a bidirectional signal transmission channel between the upper computer and the lower computer, and the lower computer transmits the electric signal of the state parameter of the monitored object to the upper computer and receives the control signal sent to the lower computer by the upper computer;

the monitoring object is related equipment in cargo oil loading and unloading operation, and at least comprises the liquid level and the temperature of a cargo oil tank and the liquid level of a water tank, and also at least comprises the inlet pressure, the outlet pressure, the rotating speed, the current, the temperature of a bearing and a stuffing box of a cargo oil pump, a tank washing pump and a ballast pump, and the running state of cabin equipment and the oil concentration and the flow of an oil discharge monitoring device.

The cargo oil monitoring platform at least comprises an upper computer, an upper computer communication module, an integrated mounting platform of a control switch and an alarm, the cargo oil monitoring platform is arranged in a cargo oil chamber and is used for remote control operation, and the remote control operation comprises the starting, stopping and speed regulation of a pump and a fan; and when the electric signal value of the state parameter of the monitored object exceeds a set threshold value, the industrial personal computer in the cargo oil room sends out an alarm signal and a control command.

The preferable technical scheme is that the communication network is an industrial local area network. The centralized monitoring mode is improved into a bus distributed monitoring system. The centralized monitoring mode transmits signals to a centralized control room one-to-one at a long distance through cables, which is not preferable in terms of security and reliability. The bus distributed monitoring system has the excellent characteristics of large measuring point coverage range, strong network interconnection capacity, dispersed monitoring, centralized management, flexible expansion, strong functions, high reliability and the like, and solves the problems of large quantity of equipment, wide distribution and difficult monitoring, operation and management.

Further, according to a preferred technical scheme, the upper computer adopts a shared storage dual-computer hot standby system, and the dual-computer hot standby system realizes a platform with single-point fault tolerance capability through software and hardware combination. In a single-host monitoring system, if a host fails, the system is directly paralyzed and fails; even if the host fails to repair, the host cannot continue to work at the fault breakpoint. The dual-computer hot standby scheme is a system platform with single-point fault tolerance capability, adopts a mechanism that a backup computer takes over the work of a working computer when the working computer fails, and carries out fault alarm, thereby realizing the automatic switching of the system and the high availability of data under the unattended condition and avoiding the loss caused by shutdown.

The preferred technical scheme is that the lower computer comprises a control box and a communication network which are respectively connected with the monitored object, a control assembly and an electrical measurement unit are arranged in the control box, and the electrical measurement unit at least comprises an input signal channel circuit, an input signal conditioning circuit, an A/D conversion circuit, a communication interface circuit and a power supply module.

In the preferable technical scheme, the upper computer adopts a PIC processor or a PLC controller.

The utility model has the advantages and the beneficial effects that: the multipoint equipment distributed monitoring system for the cargo oil loading and unloading operation of the oil tanker can improve the technical performance, the safety performance, the economic performance and the subsequent maintenance of the whole system, can integrate the corresponding functional modules together, realizes the intellectualization and the automation of the distributed monitoring and the centralized management of the multipoint equipment and the cargo oil loading and unloading operation, and has the characteristics of strong function, easy maintenance, low price and the like.

1. Distributed monitoring is adopted: the distributed monitoring mode of the multipoint equipment can not only check, count and backup the data information of the equipment, but also carry out remote centralized control on the related equipment by issuing instructions through the terminal, realize decentralized monitoring and centralized management, and have the functions of monitoring and alarming, fault diagnosis, automatic processing for replacing manual intervention and the like.

2. Adopts a modular structure: the integrated consideration of technical performance, safety performance, economic performance and subsequent maintenance are more perfect, a discrete modular unit structure is adopted, the design, production, assembly, maintenance and overhaul are convenient, the research and development period and the production period are favorably shortened, the cost is reduced, and the system function is easily upgraded to widen the application range.

3. The system is practical and reliable: practical reliability is the basic requirement of engineering design, and stable performance is the key advantage of the distributed monitoring system. According to the requirement, a dual-computer hot standby scheme and a dual-communication network based on shared storage are adopted, so that the signal stability and the working reliability are improved, and false alarms and misoperation risks caused by unstable performance are reduced.

Drawings

Fig. 1 is a general structural diagram of a multipoint equipment distributed monitoring system for cargo oil loading and unloading operations of a tanker according to the present invention;

fig. 2 is a structural diagram of a dual-computer hot standby system based on shared storage of an upper computer.

FIG. 3 is a functional flow diagram of a liquid level telemetry subsystem;

FIG. 4 is a functional flow diagram of a valve monitoring subsystem;

FIG. 5 is a functional flow diagram of a pumping and ventilation monitoring subsystem.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Fig. 1 to 5 show a multi-point device distributed monitoring system for cargo oil loading and unloading operations of an oil tanker according to the present invention, which includes an upper computer, a lower computer, a monitored object, and a cargo oil monitoring station, which are connected to each other by a communication network;

The preferred embodiment of the present invention is that the communication network is an industrial lan. The centralized monitoring mode is improved into a bus distributed monitoring system. The centralized monitoring mode transmits signals to a centralized control room one-to-one at a long distance through cables, which is not preferable in terms of security and reliability. The bus distributed monitoring system has the excellent characteristics of large measuring point coverage range, strong network interconnection capacity, dispersed monitoring, centralized management, flexible expansion, strong functions, high reliability and the like, and solves the problems of large quantity of equipment, wide distribution and difficult monitoring, operation and management.

The utility model discloses further preferred embodiment is, the host computer adopts the hot system of being equipped with of duplex of shared storage, and the hot system of being equipped with of duplex combines the platform that realizes having single point trouble fault-tolerant ability through software and hardware. In a single-host monitoring system, if a host fails, the system is directly paralyzed and fails; even if the host fails to repair, the host cannot continue to work at the fault breakpoint. The dual-computer hot standby scheme is a system platform with single-point fault tolerance capability, adopts a mechanism that a backup computer takes over the work of a working computer when the working computer fails, and carries out fault alarm, thereby realizing the automatic switching of the system and the high availability of data under the unattended condition and avoiding the loss caused by shutdown.

The utility model discloses preferred embodiment still, the next computer is equipped with control assembly and electricity measuring unit including control box and the communication network of being connected with the control object respectively in the control box, and the electricity measuring unit is at least including input signal channel circuit, input signal conditioning circuit, AD converting circuit, communication interface circuit and power module.

The utility model discloses preferred embodiment still, the host computer adopts PIC treater or PLC controller.

Fig. 1 is a general structural diagram of a multipoint equipment distributed monitoring system for cargo oil loading and unloading operations of a tanker according to the present invention. The system mainly comprises a monitoring control subsystem, a liquid level remote measuring subsystem, a valve monitoring subsystem, a pumping and ventilation monitoring subsystem and the like.

The safe and efficient operation of the cargo oil loading and unloading operation of the oil tanker is of great importance, and a monitoring alarm and safety control system is required to be equipped based on the principle, so that the basis for realizing the automation and the intellectualization of cargo oil loading and unloading is provided, and the cargo oil can be successfully conveyed by the oil tanker. The system completes the monitoring of the equipment through the liquid level signal of the liquid tank, the opening and closing and opening degree signal of each remote control valve, the starting and stopping of each pump, the inlet and outlet pressure signal and the acquisition, transmission, processing, display, alarm and remote transmission of other ship equipment signals, and simultaneously controls according to the monitoring state.

A monitoring part: cargo oil tanks (liquid level, temperature), water tanks (liquid level), cargo oil pumps, electric pumps, tank washing pumps, ballast pumps and other pumps (inlet/outlet pressure, rotating speed, current, bearing and stuffing box temperature), cabin equipment, an oil discharge monitoring device and the like, analyze, identify and monitor parameters and send out an alarm; the control part: various valves, pumps, fans and other devices are operated, and when a dangerous state exceeding an alarm threshold value or a fault occurs, a control command is automatically sent to process potential external risks, so that the safety of personnel and equipment is protected. The on-site monitoring and control are arranged on the field side of the equipment; the comprehensive core remote monitoring and remote control is arranged in a cargo oil monitoring station in a cargo oil chamber, and all equipment monitoring points are covered; necessary public alarm points extend to the centralized control room and the ship monitoring alarm system. The cargo monitoring station is used as a main position for remote monitoring and control in consideration of the need of referring to various related data and other synchronously operated systems (such as adjusting ship ballast) during cargo loading and unloading operation.

The monitoring and controlling subsystem is formed by a software and hardware system which is integrated by taking a cargo oil monitoring station as a center and comprises monitoring and controlling software and a man-machine operation interface. The device is used for receiving equipment measurement signals through a communication network to perform data processing and analysis, feeding back signals to control a lower computer, displaying and alarming simultaneously, and transmitting required data to an industrial personal computer, a loading computer and a ship monitoring and alarming system of a centralized control room so as to timely remind a crew of responding rapidly when a fault occurs. The man-machine control interface is a medium for realizing interactive operation between a duty crew and other subsystems, and comprises an upper industrial personal computer, a display, a knob, a key, a combined control panel and the like on a cargo oil monitoring platform.

The liquid level remote measurement subsystem is used for measuring the liquid level of the liquid tank; the valve monitoring subsystem, the pumping and ventilation monitoring subsystem are respectively used for monitoring and controlling the valve, the pumping and the fan.

In fig. 1, the cargo oil monitoring station is also provided with an internal and external communication tool. The cargo oil loading and unloading operation system can be optionally provided with other equipment according to requirements, such as oil discharge monitoring, cargo oil heating, inert gas, ballast water treatment, combustible gas detection and the like, and relevant equipment is monitored, so that a crew can quickly find and treat a potential hazard source on duty.

The system uses two hosts which are mutually backed up to jointly execute the same service, wherein one host is a working machine, the other host is a backup machine, the two hosts are connected with shared storage equipment, an operating system, application software and dual-host software are respectively installed on the internal storage of the two hosts, and the data of the application service is stored on the shared storage equipment. The two hosts are connected through a local area network, and the running state of the other host is monitored at any time.

The system has single-point fault tolerance capability, when a working machine fails and cannot normally provide service, the backup machine can timely detect fault information and timely carry out fault transfer according to a switching strategy, the backup machine takes over the work of a fault host machine, the system is ensured to automatically and uninterruptedly operate, fault alarm is carried out, and a crew on duty is prompted to maintain the fault host machine.

The switching process is fully automatic, completely transparent and can be completed in a short time, thereby avoiding immeasurable loss caused by long-time pause. Because the same storage device is shared, the two hosts actually use the same data, and the problem of data consistency is not worried about. After the fault is eliminated, the crew on duty can select to automatically or manually switch the service back to the original host; or the host machine can be selected not to be switched, the maintained host machine is used as a backup machine at the moment, and the dual-machine system continues to work.

FIG. 3 is a functional flow diagram of a fluid level telemetry subsystem. The branch system consists of 4 liquid level collection boxes, a plurality of liquid level sensors (of a gas-electricity type or a piezoelectric type) and temperature sensors, wherein the temperature sensors are used for measuring the temperature of cargo oil in the oil tank. The actual number of the liquid level collection boxes is adjusted according to the condition of the oil tanker liquid tank.

The 4 liquid level collection boxes are respectively mounted on the front part of a port side, the rear part of the port side, the front part of a starboard side and the rear part of the starboard side of the ship in a wall-hanging manner and used for collecting liquid level signals and transmitting the liquid level signals in a dual-communication manner so as to improve the reliability of the system. One communication line transmits signals, the other communication line is a spare line, when the communication line breaks down, the system sends out an alarm and switches to the spare line, and signal transmission is not affected.

Adopt the daisy chain to connect the transmission signal, the left front liquid level collecting box that promptly will gather liquid level, temperature signal respectively through two way communication lines transmission to left back and right back liquid level collecting box, and left back, right back liquid level collecting box received signal assembles the back, carries to cargo oil monitoring station through two way communication lines respectively. The sensor generates an analog quantity signal through measuring the liquid level height change.

FIG. 4 is a functional flow diagram of a valve monitoring subsystem. The branch system consists of 2 valve control boxes and a plurality of electrohydraulic remote control valves. The actual quantity of valve control box can be adjusted according to the valve arrangement condition, and the valve type is according to the selection of demand electrohydraulic type switch type butterfly valve, electrohydraulic opening type butterfly valve or electrohydraulic type switch type stop valve. The valve control box is arranged at the position where the valves are concentrated and used for collecting and transmitting state signals of the valves and receiving the signals to control the action of the valves.

The system adopts a double-communication mode to transmit signals, one communication line transmits signals, the other communication line is a standby line, when the communication line breaks down, the system sends out an alarm and switches to the standby line, and the signal transmission is not affected. Adopt the daisy chain formula to connect the transmission signal, 2# valve control box is connected to 1# valve control box through two way communication lines promptly, and 1# valve control box is connected to the monitoring control branch system of cargo oil monitoring station through two way communication lines. The signals are transmitted bidirectionally through the communication line. The 2# valve control box receives the state signal of the valve, displays and alarms on the ground plate, transmits the signal to the 1# valve control box, and transmits the signal to the cargo oil monitoring station after the 1# valve control box receives the signal. The control signal sent by the cargo oil monitoring station is transmitted to the No. 1 valve control box firstly and then transmitted to the No. 2 valve control box to control the opening and closing of the valve, and the valve can also be controlled on site by a site panel. The remote control valve consists of a valve body and a driving head, the driving head can feed back the opening and closing state of the valve to the valve control box in the form of a switching value signal, and the opening state (only aiming at the opening type valve) is fed back to the valve control box in the form of an analog value signal; meanwhile, the signal of the valve control box can be received to control the action of the valve.

FIG. 5 is a functional flow diagram of a pumping and ventilation monitoring subsystem. The sub-system consists of a water pump control box, an oil pump, a ventilation control box and various sensors. The control box is used for collecting and transmitting state signals of the valve and receiving signals to control the action of the water pump, the oil pump and the fan.

According to different types of water pumps, the water pump control box can be divided into a daily bilge pump control box, a ballast pump control box and a bilge fire-fighting general pump control box, and the actual configuration condition is determined according to the requirements of the oil tanker. The water pump control box receives power supply of the ship, provides power supply for the corresponding water pumps, measures pressure at the inlet and the outlet of each water pump, transmits analog quantity signals generated according to the measured liquid level to the control box, and monitors operation and fault states of the water pumps.

The oil pump and the ventilation control box receive the power supply of the ship, provide power for the cargo oil pump and the fan and monitor the operation and fault states of the cargo oil pump and the fan. The cargo oil pump is one of the key devices for the lightering of the oil tanker, and conveys oil products in a cabin to a dock terminal of the opposite side or a power device of a ship through a pipeline. The driving device can be an electric motor, and can also be driven by a power generation diesel engine or a turbine in the engine room through a cabin-penetrating transmission shaft, for example, the free end of a diesel generator set is used for driving a cargo oil pump through a clutch compartment transmission device. A special independent pump chamber is generally arranged close to the stern cabin of the ship and is used for installing equipment such as a cargo oil pump, a cargo oil scavenging pump, a ballast pump and the like. The pump cabin is positioned between the cabin and the cargo oil cabin, all equipment in the pump cabin has explosion-proof performance, and an explosion-proof airtight type cabin stuffing box is arranged on a shaft penetrating through the cabin and the cabin wall of the pump cabin. The cargo oil pump may be equipped with the following monitoring: the temperature sensor of the pump shell, the temperature sensor of the bearing, the vibration sensor of the pump, the mechanical sealing liquid level switch of the pump, the suction port and the discharge pressure sensor of the pump, the temperature monitoring of the stuffing box contacted with the safe area cabin, and the like can be displayed in the cargo oil chamber.

The system adopts a double-communication mode to transmit signals, one communication line transmits signals, the other communication line is a standby line, when the communication line breaks down, the system sends out an alarm and switches to the standby communication line, and the signal transmission is not affected. Adopt the daisy chain formula to connect the transmission signal, for example, daily bilge pump control box of 2# is connected to daily bilge pump control box of 1# through two way communication lines, and the rethread two way communication lines are connected to the monitoring control branch system of cargo oil monitoring platform. The signals are transmitted bidirectionally through the communication line. The 2# daily bilge pump control box receives the state signal of the valve, displays and alarms on the ground plate, transmits the signal to the 1# daily bilge pump control box, and transmits the signal to the cargo oil monitoring platform after the signal received by the 1# daily bilge pump control box is gathered. The control signal sent by the cargo oil monitoring platform is transmitted to the No. 1 daily bilge pump control box and then transmitted to the No. 2 daily bilge pump control box to control the water pump, and the water pump can be controlled on site through a panel on site.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A multipoint equipment distributed monitoring system for cargo oil loading and unloading operation of an oil tanker is characterized by comprising an upper computer, a lower computer, a monitored object and a cargo oil monitoring platform which are mutually connected by a communication network;

the monitoring object is related equipment in cargo oil loading and unloading operation, and at least comprises the liquid level and the temperature of a cargo oil tank and the liquid level of a water tank, and also at least comprises the inlet pressure, the outlet pressure, the rotating speed, the current, the temperature of a bearing and a stuffing box of a cargo oil pump, a tank washing pump and a ballast pump, and the running state of cabin equipment and the oil concentration and the flow of an oil discharge monitoring device;

2. The multipoint device distributed monitoring system for cargo handling operations of a tanker according to claim 1, wherein said communications network is an industrial local area network.

3. The multipoint equipment distributed monitoring system for cargo oil loading and unloading operation of the tanker according to claim 2, wherein said upper computer uses a shared storage dual-computer hot-standby system, and the dual-computer hot-standby system implements a platform with single-point fault tolerance capability by combining software and hardware.

4. The multipoint equipment distributed monitoring system for the cargo oil loading and unloading operation of the tanker according to claim 1, wherein the lower computer comprises a control box and a communication network which are respectively connected with a monitored object, a control assembly and an electrical measurement unit are arranged in the control box, and the electrical measurement unit at least comprises an input signal channel circuit, an input signal conditioning circuit, an A/D conversion circuit, a communication interface circuit and a power supply module.

5. The multipoint equipment distributed monitoring system for cargo oil handling operations of a tanker according to claim 1, wherein said upper computer employs a PIC processor or a PLC controller.