Is it permissible to weld a grounding wire to the base after the pump has been installed, and what are the consequences?
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After the mechanical pumps have been installed and secondary grouting has been carried out, due to on-site constraints, the lightning protection grounding wires are welded directly to the pump bases. What impact does this have on the machines? Is there any standard that explicitly prohibits welding on the base?
Is it determined that the grounding wire should be welded directly? The grounding should be of a detachable design to facilitate inspection.
There’s definitely no problem; it’s possible to do this!
Generally, the grounding wire of mechanical pumps is connected to the motor, with few cases where it is connected to the pump’s base. It can be welded, but there must be a separation point that is secured with bolts to facilitate the annual measurement of the grounding resistance.
This post was last edited by xlxuiin on 2015-6-24 at 15:38. There are specific requirements for the installation of grounding wires; please follow those requirements. SH 3097-2000 \"Code for Design of Static Grounding in Petrochemical Industries\"
No, a 2-meter-long angle iron should be driven into the ground to serve as a lightning protection grounding wire.
There’s no need to worry about whether it’s a ground wire or a lightning protection wire. Here, we will only discuss the precautions that should be taken when welding on the equipment itself, once the equipment (which can be pumps or other devices) is in place. When welding is carried out after the equipment is in place, there are two main factors that need to be considered, in my opinion: 1. The impact of the welding current on the instruments and electrical devices located on the equipment itself. Assuming it is a rectangular device, and that the welding area and the grounding area are located at each end respectively, using the device’s own grounding for welding purposes results in the worst scenario, as the welding current will flow along the length of the device. The welding current can sometimes reach 500–600 A, which is a quite high current level that is sufficient to damage instruments (this is not an exaggeration; such incidents have indeed occurred on site). The solution generally involves ensuring that the welding joint area is as close as possible to the welding point, and that this area is located away from the equipment’s instruments. It is required that the resistance of the welded ground be as low as possible. 2. Welding heat influence: During the welding process, local high temperatures are generated, which can affect the mechanical properties of rotating equipment as well as its flow channels. This is an extremely rare occurrence; generally speaking, it is not allowed.
It has no impact on my equipment, but will the person in charge of electrical work agree to it? Do lightning protection, static electricity protection, and operational grounding all require a specific burial depth or the need to be connected to grounding conductors?