Stainless steel manholes and sanitary manholes each have unique characteristics and application scenarios in the industrial field. The following is a detailed explanation of both:

1、 Stainless steel manhole

• Definition and purpose:

Stainless steel manhole is a safety emergency ventilation device installed on the top of a storage tank or container.

It is usually used in conjunction with fire extinguishers and mechanical breathing valves, which can not only prevent accidents caused by sudden overpressure or vacuum damage to the storage tank due to unexpected reasons, but also play a role in safety fire prevention.

• Material and Construction:

Stainless steel manholes are generally made of high-quality stainless steel materials such as 304 and 316L, which have good corrosion resistance and high temperature resistance.

Its structure includes manhole covers, sealing rings, bolts, flanges, and other parts to ensure sealing performance and structural strength.

• Types and specifications:

Stainless steel manholes are divided into various types such as emergency pressure relief manholes, explosion-proof fire-resistant breathing manholes, tank top manholes, tank wall manholes, and core manholes.

There are various specifications, with a diameter of usually 600mm and a distance of 750mm from the center of the manhole to the floor, making it convenient for workers to enter and exit the oil tank and ventilate during installation, cleaning, and maintenance.

• Application scenarios:

Stainless steel manholes are widely used in various industries such as petroleum, chemical, pharmaceutical, and food, especially in situations where flammable, explosive, or toxic substances need to be stored and transported.

2、 Sanitary grade manhole

• Definition and purpose:

Sanitary manhole is a device accessory specifically designed for occasions that require high hygiene standards.

It is usually installed on equipment that requires frequent cleaning and maintenance, such as food processing equipment, pharmaceutical equipment, and biotechnology equipment, making it easy for personnel to enter the interior of the equipment for inspection, cleaning, and maintenance.

• Material and Construction:

Sanitary grade manholes are also made of stainless steel materials such as SUS304, 316L, etc., to meet the requirements for corrosion resistance and high temperature resistance.

Its structural design is more refined, usually using a double-layer sealing design to ensure no leakage in high-pressure or high-temperature environments. At the same time, the surface of the manhole cover is smooth, easy to clean, and reduces the growth of bacteria.

• Types and specifications:

Sanitary manholes can be divided into circular manholes and elliptical manholes according to their shape.

There are various specifications, and customized production can be carried out according to customer needs. Common sizes include 200mm, 300mm, 400mm, etc.

• Application scenarios:

Sanitary grade manholes are widely used in industries such as food processing, pharmaceuticals, biotechnology, and chemical engineering. Especially in the food processing industry, sanitary manholes are used for inspection and cleaning of storage tanks, reaction vessels, pipelines, and other equipment to ensure hygiene and safety during the production process. In the pharmaceutical industry, the use of manholes is more stringent and usually requires compliance with GMP (Good Manufacturing Practice) standards.

3、 Summary and Comparison

• Material and Corrosion Resistance: Both stainless steel manholes and sanitary manholes are made of stainless steel material, which has good corrosion resistance and high temperature resistance. But sanitary grade manholes may have stricter material selection to meet higher hygiene standards.

Construction and design: Both include manhole covers, sealing rings, bolts, flanges, and other parts in construction, but sanitary manholes have been further optimized and improved in terms of sealing performance and ease of cleaning.

• Application scenario: Stainless steel manholes are more focused on safety emergency ventilation and fire resistance, and are suitable for storage and transportation of flammable, explosive or toxic and harmful substances in petroleum, chemical and other occasions; Sanitary grade manholes, on the other hand, are more focused on high hygiene standards in industries such as food processing and pharmaceuticals.

In summary, stainless steel manholes and sanitary manholes differ in terms of material, structure, type, specifications, and application scenarios. When choosing, comprehensive consideration should be given to specific usage needs and scenarios.