I have a question: during on-site construction at an oil depot, the signal cable of the flow meter was damaged. Is it possible to use it without replacing the cable?

Whether it is possible to simply reconnect and continue using the flow meter if its signal cable is accidentally severed during construction at the oil depot depends on the type of the signal cable and the extent of the damage. Generally speaking, if the signal line transmits analog signals or low-frequency digital signals, and the severed part can be properly reconnected, it is possible to continue using it after reconnection. To handle this issue properly, the following steps are usually required: 1. Carefully examine the extent of damage to the signal wires. If the cable is severely damaged, it may be necessary to replace it with a new one. 2. If it is decided to use it after connection, ensure electrical continuity and mechanical strength at the connection points; the joints should have good insulation to prevent short circuits or signal interference caused by moisture or other environmental factors in the future. 3. Use appropriate connection devices and tools for wiring tasks, such as welding and crimping, and ensure proper protection against water and dust. 4. After the wiring is completed, testing must be carried out to verify that the flow meter’s signal returns to normal and that the measurements are accurate. 5. Safety considerations must be taken into account, as oil depots are environments prone to fire and explosion; wiring work must be carried out in strict accordance with safety procedures, and professional guidance should be sought when necessary. It is recommended to consult the flow meter manufacturer or a professional instrumentation technician when carrying out wiring repairs, to ensure that the repairs are both safe and compliant. If the reliability after wiring is uncertain, or if there are special requirements regarding the signal transmission properties of the cables, it is recommended to replace them with new signal wires to ensure the long-term stable operation of the system. .

Yes, but it must be welded and properly shielded.

1. First, take a look at the requirements specified in SH/T3019-2016, the Code for Design of Instrumentation Piping Systems in Petrochemical Industries. According to section 7.1.4, there should be no joints in the instrumentation cables; however, junction boxes or distribution cabinets can be installed as needed. According to 10.4.1.10 of GB/T50892-2013 Code for Design of Instrumentation and Control Systems in Oil and Gas Field and Pipeline Projects, there should be no joints in the instrument wires and cables; however, junction boxes or wiring cabinets can be installed as needed. According to clause 8.5.8 of SH/T3521-2013 Technical Specifications for the Construction of Petrochemical Instrumentation Projects, control cables shall not have intermediate connectors, except in the following cases: a) When it is necessary to extend an already in use cable, a junction box or connection box should be used ； b) When eliminating cable faults in use, junction boxes or connection boxes should be installed. GB50093-2013 Code for Construction and Quality Acceptance of Automatic Instrumentation Projects 7.1.12 Cables shall not have intermediate joints; when such joints are necessary, the wiring shall be carried out within junction boxes, and crimping should be used for these joints ； When welding is used, non-corrosive welding flux should be employed. Compensation wires should be crimped. Coaxial cables and high-frequency cables should use specialized connectors. 2. Considering other factors as well, since it is buried underground and located in an oil depot, armored cables are definitely the preferred choice. 3. If the intermediate wiring is done properly (regardless of the connection method, proper waterproofing measures must be in place), I believe it can be used; however, it is not recommended if the cable is used to transmit instrument signals related to interlocking or control functions. 4. If money and time are not a concern, try to avoid leaving any tail sections that do not meet the standard requirements or pose potential risks

You explained it in such detail; I understand now. Thank you so much.

Received. We also mainly considered safety factors and recommended that the owner replace the signal cable, but the owner did not accept this suggestion.

You explained it in such detail; I understand now. Thank you so much!

It is recommended to replace the signal wires involved in important interlocks and controls. If it only displays the flow rate for reference, there is no need to replace it; ensuring a reliable connection and proper waterproofing are sufficient.

When working at the oil depot site, if the flow meter signal cable is accidentally damaged, whether it is necessary to replace the cable depends on the specific circumstances. If the signal cable of the flow meter is damaged, it may affect its proper operation, resulting in inaccurate measurements or an inability to communicate properly. Therefore, it is generally recommended to replace the damaged signal cable to ensure the proper operation of the flow meter. However, if the signal cable of the flow meter can be easily reconnected and return to normal operation after being damaged, without affecting the safety and proper functioning of the oil depot, then it may be possible to decide not to replace the cable and continue using it. It should be noted that, under any circumstances, the safety and proper operation of the flow meter and other equipment must be ensured. If the signal cable of the flow meter is damaged and cannot be repaired in a timely manner, or if safe and normal operation cannot be ensured even after repair, it should be stopped from use immediately, and a professional should be contacted for repair or replacement. Furthermore, when carrying out any on-site work at oil depots, relevant safety regulations and operating procedures must be strictly followed to ensure the safety of the work and the proper operation of the equipment.

Add an explosion-proof junction box in the middle; replacing the cable is complete nonsense. The defense fiber optic cable was damaged – did you see that the entire cable was replaced?