Based on working pressure, they can be divided into atmospheric pressure manholes and pressure manholes, such as atmospheric pressure manholes with a working pressure of 0.1 MPa and pressure manholes that can withstand 5 bar pressure.
Based on shape, they can be divided into elliptical manholes, round manholes, rectangular manholes, and square manholes, etc.
Based on function and structure, they can be divided into quick-opening manholes, manholes with sight glasses, and emergency pressure relief and flame arrestor breathing manholes. In addition, there are other types such as rotary arch manholes.
