The pharmaceutical industry is among the most precision-driven sectors, where even minor impurities or errors during production can have serious consequences for consumer health. In this environment, steel tanks play a crucial role in pharmaceutical production, handling, mixing, fermenting, transporting, and storing raw materials and finished products. Therefore, the careful selection of materials, design, and standards for these tanks is essential for ensuring drug quality and public health.
Why is steel the best choice for manufacturing drug storage tanks?
Different industries use different materials to manufacture storage tanks, but in the pharmaceutical industry, much of the key equipment is made of stainless steel . The reason for choosing stainless steel lies in its unique properties:
-
Excellent corrosion resistance:
Many pharmaceutical chemicals are acidic or alkaline. Stainless steel, especially grades 316 and 316L, resists the corrosion caused by these substances and does not tarnish or rust. -
Does not react with pharmaceuticals:
In pharmaceutical manufacturing, even the slightest contact with metals or minor impurities can alter the chemical composition of the product. Polished and hardened steel surfaces prevent reactions with pharmaceutical agents. -
Easy cleaning and disinfection (CIP/SIP): Steel tanks can be cleaned and disinfected with steam or chemical solutions. This feature is crucial for complying with Good Manufacturing Practice (GMP) requirements
. -
Durability and long service life:
Steel has high resistance to pressure, temperature and mechanical stress and can be used for many years without needing to be replaced.
Types of steel storage tanks in the pharmaceutical industry
In pharmaceutical plants, steel storage tanks are divided into several main categories depending on their intended use, shape, capacity and technical characteristics:
1. Warehouse
These tanks are used for storing raw materials, solutions, and finished products. They are typically characterized by a simple design, tightly sealing lids, and adequate ventilation systems. Their inner surfaces are highly polished and have a roughness of less than 0.4 micrometers, thus preventing microbial growth.
2. Mixing tank
These containers are used for the precise mixing of active pharmaceutical ingredients (APIs) with solvents and additives. They are typically equipped with magnetic or agitator motors whose speed and temperature are adjustable.
3. Reaction vessel
This type of tank is used in complex chemical processes involving reactions between substances. Its design includes a heat-insulating jacket, a cooling system, pressure and temperature sensors, and an automatic control unit.
4. Pressure vessel
These types of tanks are used for storing materials under high pressure and must be designed and built according to standards such as ASME Part 8 to ensure complete safety.
5. CIP and SIP cleaning tanks
Automated cleaning and sterilization systems on production lines utilize CIP (Clean-in-Place) and SIP (Sterilization-in-Place) tanks . They are typically equipped with stainless steel nozzles, heat exchangers, and hygienic valves.
Steel and steel grades used in the pharmaceutical industry
Stainless steel is a large family of steels, but only two types are commonly used in the pharmaceutical industry:
-
Stainless steel 304: Suitable for applications where high sensitivity is not required (e.g. distilled water or weak solvents).
-
Steel grades 316 and 316L contain increased amounts of molybdenum and nickel, which improves their resistance to corrosion and pitting. Steel grade 316L (low carbon) is particularly recommended for direct contact with pharmaceutical raw materials.
Hygiene standards and requirements
Steel tanks used in the manufacture of pharmaceutical products must comply with the following international standards :
-
GMP (Good Manufacturing Practice for pharmaceutical products): General requirements for the manufacture of pharmaceutical products.
-
ASME BPE: Standard for the design and manufacture of hygienic equipment in the pharmaceutical and biotechnology industries.
-
U.S. Food and Drug Administration (FDA): Approves materials and constructions that come into contact with pharmaceuticals and food ingredients.
-
Hygiene standard 3-A: Hygienic equipment specifically designed for the food and pharmaceutical industries.
Adherence to these standards ensures that no contamination, leaks or unwanted reactions occur during the manufacturing process.
Optimal design features of steel tanks for the pharmaceutical industry
-
Smooth, seamless interior: prevents bacterial growth and makes cleaning easier.
-
Three-clamp hygiene connector: Used for the safe and sterile connection of components.
-
Ventilation system with HEPA filter (High-Efficiency Particulate Air): prevents the ingress of foreign objects.
-
Magnetic or mechanical motors with speed control.
-
Warm or cool jacket for precise temperature regulation.
-
Sealed and inspectable lid with viewing window.
-
Temperature, pressure and level sensors with connection option to a PLC.
Main applications of steel storage tanks in the pharmaceutical industry
-
Production of injections and sera
-
Production of pharmaceutical syrups, suspensions and creams
-
Storage of purified water (PW) and water for injection (WFI)
-
Biotechnological processes such as fermentation or cell culture
-
Production of vaccines and biopharmaceuticals
-
CIP tank for cleaning pipes and systems
Advantages of using steel storage tanks in the pharmaceutical industry
-
Improving product safety and reducing the risk of contamination.
-
High strength, saves time and money
-
Automatic cleaning can be performed without opening the system.
-
It fully complies with GMP standards and FDA requirements.
-
The production line has an appealing and professional appearance.
-
Reducing maintenance costs
Regular maintenance and repair of steel tanks
Despite their durability, steel tanks require regular maintenance. Here are some important steps:
-
Welds and joints should be regularly checked for cracks to prevent the formation of small cracks.
-
Use the Ra test to check the roughness of the inner surface.
-
Clean and disinfect regularly with steam or disinfectant.
-
Use air and pressure filters to avoid cross-contamination.
-
Document the entire service delivery process in accordance with GMP recommendations.
In conclusion
Steel tanks play a key role in pharmaceutical production, ensuring the safe and hygienic manufacture of medicines. Thanks to their modern design, high-quality materials, and compliance with international standards, these tanks guarantee the production and storage of pharmaceuticals under strictly controlled conditions. Selecting reliable suppliers and customizing tanks for each production line are crucial for success in the modern pharmaceutical industry.