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As urban roads remain in service over the long term, thermoplastic pavement markings gradually age, fade, and become misaligned. During road reconstruction or expansion projects and when traffic routes are adjusted, existing markings must be completely removed before new signage is applied. Traditional markingremoval methods have numerous limitations; highpressure waterjet equipment equipped with a highpressure plunger pump has now become the mainstream solution for municipal pavementmarking removal projects.

In the past, removing pavement markings primarily relied on two methods: mechanical grinding and chemical solvent stripping. Grinding and milling operations generate substantial dust, can damage the aggregates in asphalt and concrete pavements, and lead to potholes, resulting in high subsequent repair costs. Chemicalbased marking removal works by using solvents to dissolve the paint; however, these chemicals seep into pavement joints, causing soil and water contamination, while residual traces may compromise the adhesion of new markings. Moreover, after application, lengthy waiting periods are required for the solvents to evaporate, leading to low construction efficiency.

The core power source of high-pressure waterjet pavement marking removal is the high-pressure plunger pump. The equipment uses this pump to deliver a steady, ultrahighpressure water stream, which is then converted into a highvelocity water jet by a specialized markingremoval nozzle, precisely impacting the bonding layer between the marking paint and the road surface. Relying on physical impact, it completely removes thermoplastic and coldspray markings without grinding the pavement substrate, thereby preserving the existing road structure to the greatest extent.

High-pressure plunger pumps offer the distinct advantage of adjustable pressure, allowing flexible adaptation to varying operating conditions. For thin coldspray road markings, moderate pressure is sufficient for rapid removal; for thick, firmly adhered thermoplastic reflective road markings, increasing the pump’s output pressure can break up the coating without damaging the asphalt pavement. The entire system is typically powered by a diesel engine, making it portable and ideal for mobile operations across multiple urban road segments.

The entire operation uses water as the working medium, with no chemical additives. The strippedoff pavement marking debris is collected along with the water flow, eliminating dust and chemical contamination, thereby meeting modern municipal greenconstruction standards. Compared with conventional methods, highpressure waterbased line removal shortens the project schedule; once the pavement has dried after treatment, new road markings can be applied immediately, significantly reducing the duration of road closures and alleviating trafficmanagement burdens.

Of course, this process places stringent demands on the stability of high-pressure plunger pumps. In municipal outdoor applications, operating conditions are complex, requiring equipment to withstand continuous, longterm, uninterrupted operation. The pump must deliver a steady pressure output; excessive pressure fluctuations can lead to incomplete cleaning or damage to the road surface. Highquality highpressure plunger pumps are wearresistant and easy to maintain, making them well suited to the variable and demanding working environments encountered in municipal field operations.

Against the backdrop of ongoing efforts to advance refined urban maintenance, high-pressure water jet lineremoval technology is gaining widespread adoption. As the heart of the entire system, the performance of the high-pressure plunger pump directly determines both the effectiveness of line removal and construction efficiency, providing environmentally friendly, highefficiency technical support for urban road rehabilitation and trafficrestructuring projects.