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Abstract Sand management remains a persistent challenge for Malaysia's aging offshore fields. The increasing number of wells with untapped potential due to sand issues is exacerbated by constraints in surface facilities. Field B, a major offshore production site in Sarawak, is significantly affected by sand production problems. Given the poor performance and short-lived efficacy of secondary sand control measures, the operator has shifted focus to managing sand production at the surface by implementing cyclonic desanders at the production jackets. Field B is currently equipped with 1 rental bulk desander in Platform A and 1 permanent bulk desander in Platform B. This paper will explore the two (2) case studies, namely the operational challenges encountered during the initial startup of the new rental desander and the required maintenance works for permanent desander based on its situational assessment to ensure its continued efficiency. The rental bulk desander in Platform-A utilizes a single-liner dual vessel configuration with a total capacity of 14,000 gross production (BLPD). Daily monitoring during startup is essential to ensure the well lineup meets production rates and differential pressure within design parameters, as failure to do so will reduce sand separation efficiency below 95%. Initial commissioning identified optimization opportunities, including fixing a faulty pressure transmitter, modifying sampling point orientation, installing a spool for debottlenecking, and improving the sampling flushing procedure. These adjustments were promptly implemented. Following the optimization activities and enhanced well lineup, the rental desander has achieved over 95% sand separation efficiency. The bulk desander is now capable of handling flow from five high–sand‑production wells, contributing an estimated 560 bopd in additional output. Further upside is anticipated through the reactivation of another five strings, which could deliver an additional 600 bopd. Separately, the permanent desander in Platform-B has operated continuously for four years without major maintenance, leading to a decline in sand separation efficiency due to changing well parameters. Major maintenance based on the situational assessment was conducted, involving inspection, cleaning, liner replacement, and calibration of electrical and instrumentation devices to ensure optimized performance. Following the completion of these activities, the separation efficiency has now improved to over 95%, making it ready to accommodate more wells while safeguarding the existing 1,000 barrel oil per day from current well lineup. Integrating multiple disciplines and ensuring effective communication are essential for the success of complex projects, promoting collaboration, innovation, and smooth progress. The rental desander project exemplifies this, requiring a multidisciplinary engineering approach. Lessons learned from the first implementation of the dual vessel rental bulk desander should be shared to facilitate future replication in other fields with similar opportunities.