Shengli Longxi (Shandong) Petroleum Engineering Technology Service Co., Ltd. was established in October 2004 and is based in Dongying, Shandong Province, at the heart of the Shengli oilfield region on the Bohai Bay coast. The firm provides petroleum engineering services covering offshore oil engineering construction, maintenance and technical consultancy, downhole operations, directional and horizontal well services and coastal auxiliary operations, with class III pressure vessel work supporting the wider portfolio. Within the marine and offshore safety equipment line, the team carries out periodical testing of LSA and FFE items, annual and five-yearly servicing of lifeboats and rescue boats, liferaft inspections, fire extinguisher recharging, fire hose and hydrant testing and checks on Emergency Escape Breathing Devices and Self-Contained Breathing Apparatus. Structural inspection scopes cover ultrasonic hatch cover testing, hull ultrasonic thickness gauging, watertight integrity testing, underwater inspection of hull and submerged items and non-destructive testing of welds and plating. Vibration analysis, noise and vibration measurement and condition monitoring complete the technical service offering. Shengli Longxi holds service supplier recognition under the China Classification Society and the Korean Register for relevant categories, supporting acceptance of reports during periodical, intermediate and special surveys carried out under SOLAS, MARPOL and code requirements. With around 84 patents on file and a multidisciplinary workforce, the company serves offshore platforms, support vessels and commercial tonnage operating in the northern Bohai Bay and adjacent waters, working with operators, contractors and shipowners that need integrated petroleum engineering, pressure equipment and marine compliance services in the Shandong region.