Repair of damaged piston rods in reciprocating compressors
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In our factory, the piston rods of the grade 2 reciprocating compressors have developed a groove 5 millimeters wide and about 2 millimeters deep as a result of medium particles pulling on those piston rods. What methods are available to repair this issue? Piston rod diameter 70 millimeters
It seems like this won’t work; either that or we might as well give it a try by using TIG welding to fill in and polish the groove. If the requirements for the gas environment aren’t very strict, give it a shot after finishing the work. Well, use it then; apply for a commendation. If it doesn’t work, discard it. :lol
It depends on the specific circumstances; what you’ve said isn’t complete enough, so it’s impossible to analyze
The piston rod can be turned to remove the scratches, then repaired using laser thermowelding, and finally machined to its original dimensions on a surface grinder.
What’s the situation now? Is there significant air leakage from the stuffing box?
Our company can provide spray repair to restore it to its original size
Please specify the exact dimensions and requirements; laser cladding can be used to achieve this.
Given the current condition of your piston rod, better repair techniques available in China can indeed be used to fix it (I have also discussed this issue with the manufacturers at Shenmu). However, considering your current situation, I personally do not recommend carrying out a repair – the cost of repair is too high; that amount would be enough to purchase a new piston rod. Also, it is best to remove or reduce impurities in the medium at the source; otherwise, one will have to keep replacing piston rods, packing, oil wipers, and so on, and air leaks will occur as well, creating safety hazards on site.
Methods such as those suggested by some people – using TIG welding followed by machining with a lathe – are, in my opinion, not a good choice, whether considering safety, stable operation, or the equipment’s failure rate. Think it through carefully.
Repairing it in this way is expensive, and it does not guarantee an extended lifespan. Safety cannot be guaranteed either. Grade 2, but it has intermediate isolation seals; if hydrogen gets into the bearing housing, that’s no small issue. It’s to save money and earn merits, right?:lol
Indeed, our medium is natural gas, and there is a serious issue with sand present; the valve discs need to be replaced frequently. We are considering installing a filter at the inlet to remove the sand, but we’re worried that this might affect the air intake volume. Do you have any good suggestions?