Emergency Manhole
Emergency Manhole manufactured by Cangzhou Huishang - 30-year professional manhole manufacturer. ISO 9001, CE certified. Pressure relief design for safe tank access....
Product Overview
Cangzhou Huishang Pipe Fittings Manufacturing Co., Ltd. manufactures high-quality Emergency Manhole with over 30 years of experience. Designed with a spring-loaded pressure relief cover, our emergency manholes provide safe and rapid pressure release for storage tanks and pressure vessels, protecting equipment and personnel in critical situations.
Technical Specifications
Standard: HG/T21516, ASME, DIN, EN, JIS, GB
Type: Emergency Manhole (Pressure Relief)
Material: Carbon Steel (A105, Q345B), Stainless Steel (304, 304L, 316, 316L)
Pressure Rating: PN16, Class 150-300
Size Range: DN500 (20")
Sealing: Spring Loaded Relief Cover
Manufacturing & Quality
Our emergency manholes feature precision-machined sealing surfaces, calibrated spring mechanisms for accurate relief pressure, and complete NDT testing (UT, MT, PT, RT). Sealing surface roughness Ra 3.2-6.3μm. Certified with ISO 9001:2015, CE (PED/CPR). Each batch comes with complete MTC traceability.
Applications
Widely used in oil storage tanks, chemical storage tanks, pressure vessels, gas processing facilities, marine vessels and emergency relief systems. Monthly capacity of 50 containers with 7-15 days standard delivery. Custom sizes and special materials available upon request.
