Stainless steel fixed sealed manhole tank is a kind of equipment commonly used to store liquids or other materials, and is widely used in pharmaceutical, chemical, food and beverage, petroleum and other industries.
1. **Material and structure**
- **Stainless steel material**: Made of high-quality stainless steel 304 or 316L, it has excellent corrosion resistance and durability, and can withstand harsh chemical environments and long-term use.
- **Fixed design**: The tank is fixed in a specific position and installed by supporting legs. Unlike mobile tanks, fixed tanks are more suitable for long-term material storage in applications.
- **Sealing performance**: The tank is equipped with a strict sealing system to ensure that during the storage process, outside air, impurities or microorganisms cannot enter the tank to prevent material contamination, especially in industries with extremely high requirements for hygiene standards.
### 2. **Manhole design**
- **Manhole function**: The manhole is located at the top of the tank and is designed as an openable sealed hole. The main function of the manhole is to facilitate operators to enter the tank for inspection, cleaning or maintenance.
- **Sealing cover**: The manhole is equipped with a high-pressure and corrosion-resistant sealing cover, which is fastened with a clamp ring to prevent internal material leakage or external contamination.
- **Quick opening structure**: Some manholes are designed with a quick opening structure to facilitate frequent inspection and cleaning operations while ensuring that the sealing performance is not affected.
### 3. **Sealing performance**
- **Efficient sealing**: The sealing performance of fixed storage tanks mainly depends on high-quality sealing rings, and corrosion-resistant materials such as food-grade silicone and polytetrafluoroethylene (PTFE) are used to ensure that the storage tank avoids leakage or contamination.
### 4. **Sanitary requirements**
- **Inner wall smoothing**: The inner wall of the stainless steel storage tank is mirror-polished to reduce the adhesion of microorganisms or residues, which is easy to clean and meets the CIP (cleaning in place) use standards.
- **Anti-pollution design**: The manhole and other openings and interfaces of the storage tank are designed with hygienic grades to reduce dead corners and avoid material contamination or cross contamination, which is particularly important in the pharmaceutical and food fields.
Bottom Discharge
The conical bottom design helps to concentrate the material in the tank to the discharge port at the bottom, reducing the amount of material residue. Due to the conical bottom, the material will naturally flow to the discharge port under the action of gravity, making it possible to almost completely empty the material in the tank and reduce waste.
Lid
The accessories on the top can be customized or selected according to requirements, such as materials inlet, exhaust valve, CIP water inlet, sealing port, etc.
Sealable Lid with Manhole
The sealing cover can effectively prevent external pollutants, dust, impurities, etc. from entering the storage tank, thereby maintaining the purity of the cosmetic raw materials in the storage tank. This is essential for hygiene during the production process and product quality.
A manhole is usually a small opening on a tank that can be opened to inspect, clean or repair the inside of the tank. It allows operators to enter the inside of the tank to perform necessary operations such as cleaning or maintenance.
CIP
Through the CIP water inlet, cleaning liquid can be injected into the tank to form a strong liquid flow to help wash away the residue or dirt deposited on the tank wall. This automated cleaning method can greatly improve cleaning efficiency and effectiveness.
Support legs
The support legs are made of high-strength stainless steel to ensure good load-bearing capacity and corrosion resistance. The number of support legs is determined according to the size and design requirements of the tank, usually 3, evenly distributed at the bottom of the tank to share the weight. The support legs are in the shape of round tubes with a reinforced bottom plate at the bottom, which is used to fix to the foundation by bolts or welding to ensure that the tank is stable and does not move.
Internal mirror polishing
The internal mirror polishing of stainless steel mobile sealed storage tanks is a key processing technology designed to improve the surface quality and performance of the inner wall of the tank. Its main purpose is to achieve a smooth and flat mirror effect through high-precision polishing.
1. **Smoothness**: The inner wall of the tank that has been mirror-polished is very smooth, and the smoothness can usually reach the level of Ra≤0.4μm. This high smoothness reduces the surface roughness and prevents materials such as liquids or powders from adhering to the inner wall of the tank, making it easier to clean and maintain, and meeting the hygiene standards of the food, pharmaceutical and other industries.
2. **Corrosion resistance**: A dense passivation layer is formed on the polished stainless steel surface, which effectively improves the corrosion resistance of the tank, especially when storing acid, alkali or highly corrosive liquids, which can extend the service life of the tank.
3. **Anti-pollution performance**: Mirror polishing reduces tiny pores and rough areas, which can effectively reduce the risk of harboring contaminants or microorganisms and ensure the purity of stored materials, especially in applications with strict hygiene requirements, such as pharmaceuticals, biotechnology, food processing and other industries.
4. **Easy to clean**: Due to the smooth and seamless surface, residues and cleaning agents can be easily rinsed away after CIP (cleaning in place system), avoiding cross contamination caused by residue accumulation.
5. **Reduced friction**: When storing materials with high requirements for fluidity or mixing, mirror polishing can effectively reduce the friction between the material and the inner wall of the storage tank, ensuring smooth material flow and reducing retention.
Material wall guide pipe
The material wall guide pipe is installed along the inner wall and is made of stainless steel to ensure corrosion resistance. Its main function is to guide the material to flow along the tank wall, avoid material accumulation or dead corners in the center, and prevent eddy currents and violent agitation, thereby reducing the generation of bubbles. This design helps to achieve uniform mixing, discharge and prevent stratification of materials, and is especially suitable for handling liquids that are prone to foaming.
