Regarding the video surveillance requirements for large-scale hazardous sources such as spherical tanks, is it necessary to be able to see all 4 sides as well as the top of the tank?

If it’s required that the top of the tank be visible, does that mean a high frame is needed to install the camera?

3.2.2.1 Gas stations (stations that provide both fuel and gas, or gas-only stations): Panoramic surveillance systems are located at two diagonals of the station area, serving to monitor the perimeter of the station or the tank area. The close-up camera is responsible for monitoring the fueling lane.

Basic Requirements for Video Surveillance Installation in Hazardous Chemical Enterprises 1. Introduction Hazardous chemical enterprises belong to high-risk industries, where safety accidents are likely to occur; therefore, it is essential to implement comprehensive surveillance of the work areas and the entire factory premises. At present, enterprises face issues such as a low level of informatization in safety production, poor quality of video surveillance, and difficulties in investigating and collecting evidence after accidents occur. To implement the principle of \"safety first, prevention foremost, and comprehensive management,\" to fulfill the enterprises’ primary responsibilities for work safety, to strengthen enterprise safety management, and to improve the overall quality of video surveillance system installations in hazardous chemicals enterprises, these basic requirements for the installation of video surveillance systems in such enterprises have been formulated.

2. Referenced regulatory documents: (1) “Procedures and Requirements for Security Prevention Projects” GA/T 75-94; (2) “Design Code for Security Prevention Projects” GB 50348-2004; (3) “Quotas for Costs of Electronic Equipment Installation Projects” HYD 41-01-1999; (4) “Technical Code for Civil Closed-Circuit Television Monitoring Systems” GB 50198-94; (5) “Code for Electrical Design of Civil Buildings” JGJ 16-2008; (6) “Construction and Acceptance Code for Electrical Installation Projects” GBJ 232-82; (7) “Design Code for Integrated Wiring Systems in Buildings and Building Complexes” GB/T 50311-2000; (8) “Design Code for Industrial Television Systems” GBJ 115-87; (9) “Design Standards for Intelligent Buildings” GB/T 50314-2000; (10) “Acceptance Code for Integrated Wiring Systems in Buildings and Building Complexes” GB/T 50312-2000; (11) “Forms of System Grounding and Safety Technical Requirements” GB 14050-93; (12) “General Technical Requirements for Intrusion Detectors” GB 10408.1-89; (13) “Design Code for Communication Grounding in Industrial Enterprises” GBJ 79-85; (14) “Electrical Equipment for Explosive Gas Environments” GB 3836.1-2000, GB 3836.2-2000; (15) “Design Code for Electrical Installations in Explosive and Fire-Hazardous Environments” GB 50058-92. 3. Basic requirements for video surveillance in hazardous chemical enterprises. 3.1 Basic requirements for video surveillance in chemical manufacturing enterprises. 3.1.1 Video system monitoring points: 3.1.1.1 For enterprises with low risk levels, the number of monitoring points should be 20 or fewer； 3.1.1.2 Enterprises with high risk: 20–100 monitoring points. 3.1.1.3 Enterprises with extremely high risk. 100–500 or more monitoring points: 3.1.2 Size of the display screens in the control room; 3.1.2.1 For enterprises with low risk levels, those with 10 or fewer monitoring points must have at least one display with a resolution of 1440×900. There must be at least two monitors with a resolution of 1440×900, with the total number being between 10 and 20. 3.1.2.2 For enterprises with a high level of risk, the TV wall is arranged using a configuration of 6+1 or more units, consisting of 1 42-inch LCD TV and 6 20-inch LCD monitors. 3.1.2.3 For enterprises with high risk levels, a layout of 18+1 or more screens is used for the TV wall, consisting of 1 42-inch LCD TV and 18 20-inch LCD monitors. 3.1.3 Basic requirements for monitoring areas in chemical enterprises 3.1.3.1 Conduct real-time monitoring of all gates within the plant premises. 3.1.3.2 Provide real-time monitoring of office areas (key areas such as the finance room, secure documents room, and archive room). 3.1.3.3 Conduct real-time monitoring of hazardous chemicals storage tanks and yards. 3.1.3.4 Conduct real-time monitoring of the loading and unloading areas as well as the parking lot for hazardous materials transport vehicles. 3.1.3.5 Conduct real-time monitoring of the production workshop (key areas and critical equipment). 3.1.4 Monitoring requirements for other areas of chemical manufacturing enterprises 3.1.4.1 Real-time monitoring of the monitoring and control room. 3.1.4.2 Configuration of monitoring terminals for key supervisors – to enable supervisors to view the monitoring points in the factory area. 3.1.4.3 Perimeter fence -- to enable automatic alarm detection of unauthorized personnel intrusion. 3.2 Basic requirements for video surveillance in other types of enterprises 3.2.1 Number of video surveillance points 3.2.1.1 Gas stations (stations that provide both fuel and gas services, as well as gas stations) must have at least 4 surveillance points. 3.2.1.2 Warehousing companies must have at least 10 monitoring points. 3.2.2 Basic requirements for video surveillance 3.2.2.1 Gas stations (stations that provide both fuel and gas services, or gas stations only): Panoramic cameras are placed on two opposite diagonals of the station area, serving to monitor the perimeter of the station or the tank area. The close-up camera is responsible for monitoring the fueling lane. 3.2.2.2 Warehousing companies  provide real-time monitoring of all gates within the warehousing area. ‚ Real-time monitoring of the warehouse area fences, warehouses, and parking lots for hazardous materials transport vehicles. ③Real-time monitoring should be carried out on the special warehouses for storing highly toxic chemicals.

4. Basic requirements for monitoring equipment 4.1. Cameras installed in areas prone to fire and explosion, such as production lines, key chemical processing equipment, and major hazard sources, must be equipped with explosion-proof covers of the ExdⅡCT6(H2) rating. The materials used for explosion-proof pan-tilt units are stainless steel, which provides good corrosion resistance; in areas with poor lighting, explosion-proof lamps or explosion-proof infrared lights must be installed. 4.2 Explosion-proof products must possess a valid explosion-proof certificate, as well as labels and markings; the labels (nameplates or warning signs) are made of metal. In addition to the product model, specifications, manufacturer’s name, date of manufacture, or serial number, the label also includes an “Ex” mark, an explosion-proof mark, and the explosion-proof certification number. Explosion-proof electrical products imported from abroad must be inspected and approved by China’s explosion-proof quality inspection agencies.

5. Basic requirements for the installation of monitoring equipment 5.1 Requirements for front-end cameras 5.1.1 Choose high-definition network cameras that utilize the latest available technology, so as to ensure the system’s advancement and readiness for future technological developments. 5.1.2 The resolution requirement for network cameras in key areas is up to 5 million pixels at the highest, and 2 million pixels at the lowest, to ensure that vehicle license plates can be clearly seen, and to enable high-definition video recording for use as evidence later on. 5.1.3 It provides support for at least four video streams, enabling it to meet the requirements of different network environments; this includes high-definition video recording with a resolution of over 2 million pixels locally, D1 video surveillance display, remote centralized monitoring of videos in D1 or CIF format, and even applications such as real-time monitoring for remote mobile work using QCIF format. 5.1.4 Network cameras can automatically adjust their frame rate based on the intelligent video analysis functions related to the key monitoring areas in the video, thereby achieving automatic bandwidth adjustment. 5.1.5 Anti-damage self-protection function: A. Dynamic video motion detection can be enabled, providing an alarm output device ； B. It can detect events such as changes in the camera’s viewing direction, blocked lines of sight, out-of-focus conditions, or damage to the camera caused by spraying, and provide an alarm output. 5.1.6 Network security features: multi-level authentication, access list control, 802.1X access control and authentication, etc. 5.1.7 Network video recording storage function: Network cameras can store footage directly on network drives (such as NAS), and it is possible to set the size of individual storage files, as well as the upper and lower limits for storage space. Time schedules for storage can also be defined, and circular recording functionality is available. 5.1.8 Free DDNS feature to meet various Internet access requirements. 5.1.9 Power supply method: Supports 12V DC simultaneously ； 24 V AC ； 802.3af (POE power supply). 5.1.10 Product certification: CE, LVD, FCC, VCCI, C-Tick. 5.2 Requirements for the monitoring center 5.2.1 The monitoring center shall be equipped with at least one integrated management platform. This platform serves as the equipment management center for the entire system, carrying out functions such as management, storage, control, and transmission. It is capable of managing various front-end data collection devices and the data they collect, and it also has the capability to integrate alarm functions for other services. 5.2.2 The monitoring center should also be equipped with a professional multi-screen display control terminal. The multi-screen display control terminal handles real-time video monitoring, playback of recorded videos, control of the entire system, display of electronic maps, and management of alarm responses. 5.2.3 The video surveillance system features remote monitoring capabilities, and it can be integrated with the DCS system and the emergency rescue system to enable coordinated operation, thus allowing for multiple uses and integration in both normal and emergency situations ； Video surveillance systems should adopt digital systems to facilitate flexible networking within enterprises and centralized management across groups.

5.3 Requirements for the integrated management platform 5.3.1 Due to its importance, the integrated management platform requires an embedded hardware design； 5.3.2 Use the Linux operating system to ensure system stability ； 5.3.3 Provides management capabilities for up to 64 network video streams ； 5.3.4 Alarm interconnection interfaces for other services that provide standards ； 5.3.5 Provides the requirement for storing network video footage for 30 days, with RAID-5 support to ensure adequate protection of the video data ； 5.3.6 Hardware watchdog protection ensures optimal system effectiveness ； 5.3.7 Remote viewing, operation, and control via TCP/IP (LAN/WAN/Internet).

5.4 Requirements for professional multi-screen display control terminals 5.4.1 A minimum of three screen display functions shall be provided: these allow for the display of the video playback interface, the real-time video viewing interface, and the control interface (which includes a list of various management devices in the central system, a list of cameras, an electronic map, alarm information, and the control interfaces for various devices). The function of displaying on a fourth screen can be expanded, such as for displaying information related to other services and enabling alarm integration. 5.4.2 Requirements for real-time video browsing function: It should support image segmentation; at a minimum, it must support the standard segmentation methods of 1, 4, 9, 16, etc. Images can be grouped in any way, and they can be displayed in sequence using these ratios of 1, 4, 9, 16. Additionally, a function to display alarm-related images when necessary is required. 5.4.3 Video playback function: Enables simultaneous playback of up to 20 video streams ； The timeline shows intelligent search capabilities; it can mark different time periods triggered by events or changes in video images with distinct colors. There is a function to instantly replay videos by selecting specific time periods, and it’s also possible to choose any video segment and divide it into equal parts, with the video being replayed in 12 equal segments on average ； It can support at least intelligent video analysis and retrieval functions such as motion detection, out-of-bound detection across lines, congestion monitoring, and lost item detection. 5.4.4 Control functions: It enables centralized management of at least 1,000 integrated management platforms. It enables the display of electronic maps, alarm linkage information, etc.