What are the advantages of installing stainless steel welded air duct in environmental protection ventilation engineering in food and medicine field?

Environmental protection ventilation engineering in food and medicine field: the core advantage of stainless steel welded air duct

The requirements of food and medicine industry (GMP clean workshop, food processing, pharmaceutical production, laboratory) on the cleanliness, hygiene, compliance and pollution prevention of ventilation system are much higher than those of ordinary industrial scenes. Stainless steel welded air duct (304/316L) is the only air duct type that can fully meet the stringent requirements in this field, and its core advantages are as follows:

First, cleanliness and hygiene: avoid product pollution from the root.

1. No dead angle, no dust, and no bacterial growth.

The inner wall of stainless steel welded air duct is flat and smooth, and all welds are polished flat, without bulge, burr and bite gap, which fully meets GMP's mandatory requirement of "no clean dead angle" for ventilation duct.

Compared with ordinary galvanized spiral duct, the bite joint and flange joint in spiral duct are natural dust-collecting dead corners, which will breed mold and bacteria, enter the clean area with the airflow, and directly pollute food and medicine, which is the key unqualified item in GMP audit.

The inner wall of the clean workshop can be polished by mirror (Ra≤0.8μm), so that dust and microorganisms cannot adhere to it, and secondary pollution can be completely avoided.

2. No material falls off, no foreign body pollution.

Stainless steel material is stable, and there will be no problems such as "galvanized layer falling off" of galvanized air duct, "fiber falling off" of FRP air duct and "plasticizer precipitation" of PVC air duct.

No debris and powder will enter the ventilation system, which completely avoids the risk of foreign bodies polluting food and medicine and meets the food contact safety requirements.

Second, corrosion resistance and disinfection resistance: adapt to the harsh cleaning scene of food and medicine

1. Resistant to all kinds of disinfection media, without corrosion and rust.

The food and medicine workshop should be disinfected regularly with 84 disinfectant, alcohol, hydrogen peroxide, peracetic acid, etc. At the same time, the workshop environment is humid and there are detergents and acid-base residues:

304 stainless steel can withstand conventional disinfection media, 316L stainless steel can withstand strong acid and alkali and chlorine-containing disinfectants, and will not rust or corrode after long-term use.

Contrast galvanized air duct: Disinfecting water will quickly corrode the galvanized layer, and rust spots and slag will appear in 1-2 years. The rust slag will enter the workshop with the airflow and directly pollute the products, which is completely inconsistent with the hygiene requirements.

2. Resistant to moisture, mildew and bacteria

Stainless steel material does not absorb water, does not mold, and does not breed mold in humid environment, so it is suitable for high-humidity workshops of food processing and drug production.

Compared with galvanized/color steel air duct, it is easy to rust and mold in humid environment, resulting in odor and microbial pollution.

III. Compliance: It fully meets the mandatory standards of the food and pharmaceutical industry.

1. Compliance with global compliance certification

304/316L stainless steel meets all requirements of China GB 4806 food contact standard, US FDA, EU EU 10/2011 and GMP good manufacturing practice.

The material is non-toxic, does not precipitate harmful substances, and does not release pollutants such as heavy metals, VOCs and plasticizers into the air. It is the only air duct material that can directly contact the food and drug production environment.

2. Meet the requirements of clean workshop audit.

The mandatory requirements of GMP and food SC certification for ventilation system are "smooth, no dead angle, easy to clean, non-shedding, corrosion resistance", and only stainless steel welded air duct can meet 100%:

No seam, no bite, no dust area, pass the cleanliness test.

We can provide material reports and welding inspection reports, which are perfect for all kinds of audits and factory inspections.

Fourth, sealing and leakage prevention: put an end to cross-contamination.

Fresh air, production exhaust air and toxic and harmful gas exhaust air in the clean area of food and medicine workshop require extremely high sealing performance, and once leaked, it will cause serious cross-contamination:

The stainless steel welded air duct is welded by argon arc welding as a whole, and the seam is tested for air tightness, with 100% no leakage, completely avoiding:

The odor and waste gas from the exhaust flow backward into the clean area.

Leakage of clean fresh air leads to increased energy consumption and substandard cleanliness.

Safety risks caused by toxic and harmful gas leakage.

Compared with the spiral/flange connection air duct, the air leakage rate of the bite and flange connection is usually 5%-10%, which is very easy to cause pollution in the clean area and completely does not meet the requirements of the food and medicine workshop.

Five, easy to clean and maintain: reduce long-term operating costs

1. It can be thoroughly cleaned and disinfected.

The inner wall is smooth and has no dead angle, which can be directly washed with water, wiped with disinfectant and disinfected with steam. It is clean and has no dead zone, which meets the mandatory requirements of "regular cleaning and disinfection" in food and medicine workshops.

Contrast galvanized/spiral duct: Bites and joints cannot be thoroughly cleaned, and dust and bacteria remain for a long time, so the cleaning effect cannot be verified.

2. Maintenance-free, no frequent replacement

The service life of stainless steel welded air duct is 20-30 years, during which it does not need to be replaced or treated with anti-corrosion, and there will be no rust or damage.

Compared with galvanized air duct, it needs to be replaced as a whole in 5-10 years, and it needs to stop production during the replacement process, which causes huge loss of production stoppage for food and pharmaceutical enterprises (the loss of production stoppage of pharmaceutical/food production lines can reach hundreds of thousands a day).

The whole life cycle cost is much lower than that of ordinary air ducts, and long-term operation is more economical.

6. Customization and stability: Adapting to complex workshop scenes

1. Customize any shape and adapt to complex layout.

The pipeline of food and medicine workshop is complex, which requires a large number of variable diameter, elbows, tees and special-shaped air pipes;

Stainless steel welded air duct can be customized with circular, rectangular, special-shaped and arbitrary-angle elbows, and all joints are welded integrally, without splicing gaps and clean dead angles.

Compared with spiral duct, only circular straight pipes can be made, and special-shaped parts need flange splicing, which is easy to leak air and accumulate dust, and cannot meet the requirements of cleanliness.

2. High temperature resistance, stability and no deformation

It can withstand high temperature above 100℃, and is suitable for food drying, drug sterilization and high-temperature disinfection, and there will be no problems of softening and deformation of PVC air duct and peeling of galvanized air duct.

Stable material, small deformation due to thermal expansion and cold contraction, and no joint cracking and air leakage after long-term use.

Summary: irreplaceable core value in the field of food and medicine

For food and pharmaceutical enterprises, ventilation system is the core guarantee of product quality, and the value of stainless steel welded air duct is far more than "ventilation":

Compliance guarantee: avoid compliance risks through GMP, SC, FDA and other audits.

Quality assurance: put an end to microorganisms, foreign bodies and cross-contamination, and ensure product quality.

Cost guarantee: no replacement for 20-30 years, reducing the loss of production stoppage, and the whole life cycle cost is lower.

Operation guarantee: easy to clean and maintenance-free, reducing the daily operation and management costs.