Description
The manhole is a safety emergency ventilation device installed on the top of the storage tank, usually used with fireproof and mechanical breathing valve, which can not only avoid accidents caused by sudden overpressure in the tank or damage to the storage tank during vacuum, but also play a safe fire resistance role, and is a safety device to protect the storage tank. Especially suitable for storage materials with nitrogen capped vault atmospheric tank, with constant pressure discharge, constant pressure suction, flexible opening and closing, safe fire resistance, compact structure, good sealing performance, safe and reliable.
Manholes have a variety of designs: such as round, oval, square, open inside, open outside, pressure type, atmospheric type. It can also be configured with sight mirror, all-glass view, etc., the internal and external surface polishing treatment, the accuracy can reach Ra 0.5um,Ra 0.8um, the external surface is usually polished, matte treatment, sandblasting treatment. The maximum pressure is up to 5.0bar. The material is SS304 SS316L, which is mainly used in various pressure vessels in food, wine, beverage, pharmaceutical and other industrial fields.
Stainless steel manholes include pressure manholes and non-pressurized manholes, of which the non-pressurized tank manholes can provide SS304 or SS316. They are mainly used in tank equipment such as atmospheric storage tanks and mixing tanks to check the liquid level, while maintaining control of the air at the top of the tank – the manhole is sealed and prevents air exchange. The manhole is usually installed on the top of the tank, and its size depends on the condition applied: larger ones facilitate the addition of solids, or smaller ones for the addition of liquids or powders.
Manhole pressure depends on the thickness of the wall of the stainless steel material and the thickness of the flange ring, we can provide round manholes, square manholes and oval manholes. According to different customer needs, we can customize the glass manhole, with breathing valve manhole, the surface can be sandblasted or mirror polishing
Glass manholes are very convenient for observing tank materials. We can also install manholes with lights, which are slightly more expensive than other manholes, which are suitable for the installation of atmospheric tank tops. The functions are divided into fully enclosed, observable glass mirror type and observable glass mirror type with light.
- Oval manhole specifications: 320 x 440mm, 350 x 450mm, 410 x 510mm
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