I. Product Introduction

Manholes are installed at the top and bottom sides of storage tanks. The top manhole is used for lighting and emergency exhaust, while the side manhole serves as the entry and exit point for operators during tank construction, cleaning, and emptying. The strength and sealing of the manholes are critical technical aspects.

Our manholes are manufactured in accordance with the standards HG/T21514~21535-2014 and HG/T21594~21604-2014.

Section 2: Common Manhole Structures

Common Manhole Structural Types are detailed in the table below.

1. The HG/T 21515-21517-2014 standard manhole is commonly used on the top of storage tanks, with the HG/T 2151-2014 atmospheric pressure manhole typically used as a light transmittance hole.

2. HG/T 21519~21521-2014 standard manhole is commonly used at the side bottom of storage tanks, serving as a tank wall manhole.

3. HG/T 21522-21524-2014 standard manholes are commonly used on the tops of storage tanks, with HG/T 21524-2014 standard typically for pressure vessels.

Section 3: Common Manhole Parameters Table

Common Manhole Structural Styles

Hint: 1. The above are standard products. For non-standard flanges or quick-opening flanges, customers should provide a drawing of the product's external dimensions.

2. During ordering, the customer should specify the technical requirements for weld inspection.