In recent years, in order to meet the needs of the rapid development of the national economy, the national investment in the construction of oil and gas pipelines has gradually increased, forming a crisscross oil and gas transmission pipeline in the country.
During 2009-2015, the state plans to build about 8000 km of new branch pipelines in the four key target markets of Southeast China, Yangtze River Delta, Bohai rim and Central South region. It includes the following pipelines:
1. It is planned to build Qinhuangdao Shenyang line, Shaanxi Beijing third line, Shandong pipe network and other trunk pipelines around Bohai Sea;
2. Planning and construction of the second and third west line, Shiyan Branch and Xiangtan branch in central and South China;
3. Planning and construction of the second west line, the third west line, the China Myanmar pipeline and the Fujian branch along the southeast coast;
4. The Yangtze River Delta region plans to build the Shanghai Branch of the second west line, Jinhua Lishui Wenzhou Taizhou Branch and Rudong Nantong Jiangdu pipeline.
At that time, an oil and gas gathering and transportation network will be formed with the West first line, the west second line, the West third line, the Shaanxi Beijing first two third line, and the Sichuan East gas transmission line as the main lines. The basic natural gas pipeline network across the east-west and North-South will have a significant impact on China’s national economy.
In the past, petroleum, petrochemical and natural gas industries have always been the key industries of national security. In case of fire or explosion, it will cause heavy casualties and serious losses of national property. Therefore, in the field of oil and gas gathering and transportation, in order to ensure the effective monitoring of the whole production and transportation process and the absolute safety of personnel and equipment, it is very urgent and important to establish a set of intelligent and highly reliable integrated network centralized monitoring system for oil pipelines.
This paper focuses on the industrial TV monitoring system and laser shooting perimeter prevention system of gas pipeline station.
The overall goal needs to meet the following three aspects.
1. For video monitoring, the stations along the oil pipeline are mainly based on local monitoring, local storage and local management, supplemented by remote monitoring and remote management. The functions of local monitoring, storage and management do not depend on remote devices. In case of problems in the transmission system, the system in the station shall be able to operate independently and normally.
2. The management (system setting, authority management, etc.), control (operation lens), display (screen switching) and storage (video recording) of the monitoring system are relatively independent, and the failure of one part will not affect other parts.
3. The industrial TV system must be effectively linked with the perimeter prevention system and fire protection system.
In order to prevent various production accidents, oil and gas pipelines need to conduct comprehensive monitoring on the first station, off load station, pigging station, compressor station, liaison station, monitoring valve chamber, RTU valve chamber, terminal station and other important places along the line.
At the same time, the system needs to monitor the equipment work and personnel activities in the process unit area, field area, gate and other areas of the station, timely discover or confirm the equipment failure, fire and illegal intrusion and other security risks, and support the linkage perimeter prevention, fire protection and other subsystems. The superior department in charge can know the production situation at any time, so as to make the correct command strategy according to the actual situation of the scene in case of emergency.
This paper describes the user requirements of the system from two aspects of local monitoring and remote monitoring.
Local monitoring requirements (primary monitoring center)
The main purpose of local monitoring is to understand the work of personnel and the operation of equipment in the whole station. The camera front-end transmits the captured images to the station control room to realize all monitoring functions, so as to deal with emergencies in a timely manner. The monitoring functions mainly include: collecting, transmitting and switching display of single or multiple images; storing and calling various images; through the action of pan tilt and lens of the camera In order to achieve better monitoring effect. The valve chamber is an unattended place. The video monitoring equipment is only equipped with camera and video server, without storage and monitoring terminal. The video image is transmitted to the adjacent station through SDH transmission network for monitoring and storage.
The number of local monitoring video channels is generally no more than 16, which needs to meet the requirement of 24-hour uninterrupted video recording. It can also be set to multiple recording modes, such as periodic plan recording, motion detection recording or alarm recording. All images can be saved. When the video storage format is D1, the video file can be saved for about 30 days at most. It can also search and replay the video files according to the time or events, and transfer the video files to other storage devices such as CD.
The perimeter prevention system is arranged on the wall around the station to prevent the invasion and destruction of external personnel. As the place is a high-risk place for oil and gas, the traditional infrared radiation and electronic fence can not be used, but the laser radiation perimeter prevention system with explosion-proof function must be used.
The SCADA system, perimeter prevention system and fire fighting equipment installed in each station can be linked with the video monitoring system; at the same time, the sound and light alarm host is installed in the control room of the station to alarm with the monitoring host.
The system must realize the movement detection function of ball machine and gun machine. With this function, the system should be able to give an alarm when people or vehicles cross the pre-set warning line, and give an alarm when objects (mainly people or vehicles) move into the screen. The alarm function should be able to deploy or remove the defense according to the requirements.
The system must realize the automatic tracking function of the high speed ball machine. The automatic tracking function of moving objects refers to that when the system finds a moving person or vehicle in a monitoring area, it can mobilize the pan tilt, lens and other mechanisms of the camera to track and shoot the moving objects until the moving objects exceed the monitoring range of the front-end camera. When this function is started, it can trigger the alarm and video recording. This function can be realized through the front-end camera or the back-end network video server (encoder), or through the platform software.
Remote monitoring requirements (secondary monitoring center)
The local video signal of the station is transmitted to the remote control center through the SDH transmission network, and the remote control center can realize remote monitoring of the front-end equipment of the station according to the authority.
Overall planning scheme
Industrial TV monitoring system
The industrial TV monitoring system of oil and gas pipeline can be divided into local monitoring system and remote monitoring system in the design structure. The process station belongs to local monitoring, and the local monitoring system in the station includes front-end cameras, various sensors and back-end monitoring, storage and management platform configured in each process station along the line; the trunk line management office, control center and main control center all belong to remote monitoring The remote monitoring system mainly realizes the remote monitoring terminal to view the monitoring video, alarm data, video and other data in the process station along the line, as well as the control of the front-end camera in the process station. As shown in Table 1, for remote cameras in special monitoring places, if they need to be connected to the station monitoring system, they can be connected by optical terminal.
Perimeter alarm system
The perimeter alarm system takes the alarm control host as the control center. The alarm control host is responsible for the alarm system detector’s arming and arming control, detector acquisition signal processing, alarm signal output and linkage television monitoring system.
A laser detector is installed above the wall to form an alarm system against illegal crossing without dead angle. Once someone breaks in illegally and cuts off the laser beam, the alarm will be sent to the station control duty room immediately, and it will be linked with the video monitoring system at the same time. The monitoring front end provides preset position support, and the image of the alarm area is automatically displayed on the display and recorded in real time.
Laser counter fire alarm detector is installed at the four corners of the enclosure, and the transceiver terminal located in the explosion-proof area must be equipped with explosion-proof shield.
Platform access strategy
The video monitoring content of the front-end station needs to be connected to the video monitoring management platform of PetroChina Beijing main dispatching and control center. Because the platform is an existing platform, and the video monitoring equipment of the station is diverse, the access platform needs to achieve interconnection between the equipment of various mainstream manufacturers and the platform. At present, there are two access methods: through the SDK package provided by the equipment manufacturer; through the open interface protocol provided by the equipment manufacturer.
System architecture and function realization
The video monitoring system of oil pipeline industry usually uses NVS (network video server) or embedded DVR (digital hard disk video recorder) as the core. The system adopts three-level Networking: station monitoring point, regional monitoring center and control center monitoring center (as shown in Figure 2). In terms of structure, it can be divided into local monitoring system and remote monitoring system in the station. In addition to the local monitoring system in the station, the monitoring centers of regional monitoring center and control center belong to remote monitoring.
The local monitoring system in the station includes the front-end cameras and the back-end monitoring, storage and management platform. The remote monitoring system mainly realizes the remote monitoring terminal to watch the monitoring video and video data in the process station along the line, and control the front-end camera in the process station.
In addition, the local station control video monitoring system also needs to be connected to the integrated video monitoring system of PetroChina Beijing oil and gas control center. The system consists of central management unit, equipment access agent, integrated video switch and monitoring terminal. The integrated video monitoring system needs to develop corresponding interface software modules for the video monitoring system within its jurisdiction, so as to realize the viewing of video monitoring pictures and videos of all stations.
Front end yard architecture
As shown in Figure 3, when the encoder adopts the multimedia access unit (DVR or NVS), the video monitoring point of the process station is composed of the front-end camera, multimedia access unit (16 channels), alarm, perimeter alarm system, speaker, microphone, smoke sensor, network switch, NVR, monitoring terminal, etc., and the front-end video is stored on the NVR.
The monitoring site is responsible for the media data acquisition and control command execution of the monitoring system, which is one of the important parts of the whole system. It mainly completes video information collection, coding, compression and transmission, camera control and alarm input / output. In case of personnel intrusion, fire and other alarms, the system will immediately present the alarm on the monitoring terminal, at the same time, it can link the audible and visual alarm and switch the video. At this time, the personnel on duty can inform the relevant personnel to rush to the site for treatment through the fire broadcasting system in the station, or guide other personnel to evacuate in time.
Control center structure
The control center is composed of central management server, streaming media server, multimedia switching unit (decoder), monitoring service station terminal, management service station terminal, TV wall composed of monitor, speaker, microphone, network switch, etc.
The video monitoring platform of the control center can be adjusted to see the real-time video and important video of the main line process station under its jurisdiction, which can be stored in the center, and the real-time video can be transmitted at the same time. The platform software function module mainly includes the center management module, access management module, video forwarding module, database function module and multimedia switching unit module.
The system advantages of this project are mainly in the following aspects.
·Single point login, unified authentication, unified platform;
·Carrier level reliability design, the system is stable and reliable;
·Loosely coupled architecture design, multi-level center interconnection, independent keep alive;
·Open system platform design, standard com and API interface;
·Comply with onvif international standards, widely compatible with mainstream front-end equipment;
·Use the latest mobile technology to experience the personal monitoring service;
·Intelligent routing technology can reduce the network load;
·Professional network management system, convenient maintenance;
·Maintain electronic inspection, improve the efficiency of operation and maintenance.
At present, the front-end of station monitoring is mainly based on analog standard definition camera plus encoder access. With the development of high-definition, networking and intelligence of video monitoring, it is believed that the application of high-definition network camera in the newly-built oil pipeline network monitoring system will gradually increase. In the future oil pipeline industrial TV monitoring system, the integration of high-definition and intelligence equipment will gradually increase Replace analog front-end video devices.
Editor in charge: GT