The standards for food-grade liquid transportation have been upgraded, and the polishing precision requirements for the inner walls of stainless steel tanks have been enhanced.
Source：
Release time：2025-11-05
Page views： 0
As food safety standards continue to be upgraded, the field of food-grade liquid transportation is placing increasingly higher demands on the polishing precision of the inner walls of stainless steel tanks.
As food safety standards continue to be upgraded, the food-grade liquid transportation sector is placing increasingly stringent demands on the polishing precision of the inner walls of stainless steel tanks. According to industry regulations and practical case studies, the surface roughness (Ra value) of tank inner walls has become a key indicator: For tanks that come into direct contact with highly allergenic media—such as infant formula and fresh milk—the inner walls must be polished to an Ra value of ≤0.4 μm. This is achieved through electrolytic polishing, which helps reduce the risk of protein residue and microbial growth. For tanks that come into contact with lower-risk media—such as mineral water and carbonated beverages—the inner walls need only meet the mechanical polishing standard of Ra ≤ 0.8 μm.
The upgrade of the polishing process not only involves controlling surface roughness but also simultaneously meeting additional requirements such as weld seam smoothness and passivation treatment. For example, after polishing the tank weld seams, they must transition smoothly and flush with the pipe wall, with a protrusion height no greater than 0.1 mm to prevent fluid stagnation. Following polishing, a passivation treatment must be performed to form a chromium-rich oxide film that provides corrosion resistance, ensuring that the leaching of metal ions complies with food-grade standards.
In practical applications, a dairy company reduced the risk of microbial contamination by 85% by improving the polishing precision of the inner walls of its transport tanks from Ra0.8 μm to Ra0.4 μm and integrating this with a CIP cleaning system. This upgrading trend indicates that food-grade liquid transportation is shifting from “basic cleanliness” toward “high-precision, controllable standards,” driving the industry to achieve dual improvements in food safety and transportation efficiency through process optimization.
Previous:
Related Blog
What are the advantages of stainless steel storage tanks?
Stainless steel storage tanks have excellent sealing performance, effectively preventing the volatilization and leakage of stored media, thereby reducing resource waste and environmental pollution.
What are the welding requirements for large storage tanks?
For the storage of vast quantities of materials, large-scale storage tanks are required. Typically, these large storage tanks are constructed by welding together multiple small metal sheets. Therefore, stringent requirements must be imposed on the welding process to ensure the high quality of these large storage tanks.
What are the safety precautions for cleaning oil storage tanks?
Oil tanks are essential equipment for storing petroleum products in today’s society, and cleaning these tanks is absolutely indispensable.
Full-synthetic oil for tanker truck maintenance may not be right for you!
Some tanker truck users need to change their engine oil after driving a certain number of kilometers. They’ve heard that fully synthetic oil is better than the semi-synthetic oil originally used in their vehicles—can they switch to fully synthetic oil? Actually, this depends closely on the specific vehicle model; what’s good for one vehicle may not necessarily be suitable for another.
The quality of brake fluid in oil tankers directly affects driving safety!
Tank trucks are also referred to as hazardous-material vehicles. Currently, China has seen a frequent occurrence of traffic accidents involving such vehicles, causing significant harm to society and families. Of course, the high incidence of accidents is closely linked to the vehicle’s braking performance, which leaves much to be desired. So, how can we prevent these accidents before they happen?
Aluminum alloy liquid tank lightweighting technology has entered a stage of mature application and has become the mainstream solution in the global oil tanker industry.
In recent years, the market demand for semi-trailer liquid tank trucks has shown a consistently robust trend. As China’s economy continues to grow steadily, industries such as chemicals and energy are expanding in scale, leading to an ever-increasing demand for the transportation of liquid goods.
As food safety standards continue to be upgraded, the field of food-grade liquid transportation is placing increasingly higher demands on the polishing precision of the inner walls of stainless steel tanks.
Ensuring product quality is crucial for businesses!
Our company places product quality first. Through a comprehensive quality management system, advanced production processes, and stringent testing standards, we ensure that every stage meets high-quality requirements.
The Importance and Strategies of After-Sales Service Assurance
Guaranteed after-sales service is not only crucial to a company’s current performance—it’s also an indispensable component of its long-term development and brand building.
Related products
Inquiry
If you have any product-related questions, please feel free to contact us!