The BS4825 standards for dairy and food process systems explained

 

stainless_steel_piping_dairy_food_factory_Small

What is the BS4825 Standard?

 

  • The British Standard BS4825 is an internationally accepted regulation for stainless steel tubes, fittings and couplings for industries where a very high level of hygiene is required.

 

The BS4825 standard is mainly used in

  • Breweries
  • Dairy factories
  • Food production companies
  • Chemical industry

 

The BS4825 standard includes agreements on:

  • Dimensions
  • Dimensional tolerances
  • Material requirements
  • Surface finish
  • Hygienic assembly of couplings

 

The BS4825 standard is devided into 5 parts:

  • Part 1: Specifications of seamless and longitudinally welded austenitic stainless steel tubes
  • Part 2: Specifications for bends and tees
  • Part 3: Specifications for clamp type couplings
  • Part 4: Specifications of IDF type couplings
  • Part 5: Specifications of RJT type couplings.

 

  • The BS4825 does not contain specifications for crosses and reducers, nor are flanges specified in the standard. 

 

  • Besides the coupling types that are described in one of the BS4825 parts, SMS couplings are also often used in British dairy systems. Including welding connections, you have no less than 5 different options for connecting pipes and fittings and that is quite special.

 

Approved materials:

 

Tubes and fittings from the BS4825 range are always made of stainless steel.

  • Stainless steel grade 304L (1.4307)
  • Stainless steel grade 316L (1.4404)

Stainless steel 304L is mostly used in the dairy and food sector.

Couplings sometimes use 316L (1.4404) ferrules and male parts, while the nut is made of stainless steel 304 (1.4301).

 

The benefits of use:

 

  • It doesn't matter from which supplier you buy your BS4825 standard parts: the dimensions, materials and quality are always the same.

 

BS4825-Beer_brewery_tubing_with_tri_clamp_couplings_Small
Image: BS4825-3 Clamp type couplings are often used in beer breweries

 

 

  • BS4825 Part 1: Hygienic tubes

 

Dimensions

BS4825_Tube_Dimensions
Size Dimensions D x s (mm)
1/2" 12,7 x 1,6
3/4" 19,05 x 1,6
1" 25,4 x 1,6
1 1/2" 38,1 x 1,6
2" 50,8 x 1,6
2 1/2" 63,5 x 1,6
3" 76,2 x 1,6
4" 101,6 x 2,0

 

  • BS4825 Part 2: Welding bends and -tees

 
 

 

  • BS4825 Part 3 Clamp type couplings

BS4825-3_Tri-Clamp_Coupling_-_3D_CAD_Files_Download-4A BS4825-3_Tri-Clamp_Coupling_-_3D_CAD_Files_Download-3B BS4825-3_Tri-Clamp_Coupling_-_3D_CAD_Files_Download-3A
     
  • BS4825 Part 4 IDF type couplings

BS4825-4_IDF_Coupling_-_3D_CAD_Files_Download-3A BS4825-4_IDF_Coupling_-_3D_CAD_Files_Download-2D BS4825-4_IDF_Coupling_-_3D_CAD_Files_Download-2C

The Parts:

  • 1 Liner
  • 1 Male threaded part
  • 1 Hexagon nut (Female part)
  • 1 Seal ring
   
  • BS4825 Part 5 RJT type couplings

BS4825-5_RJT_Coupling_-_3D_CAD_Files_Download-3C BS4825-5_RJT_Coupling_-_3D_CAD_Files_Download-3B BS4825-5_RJT_Coupling_-_3D_CAD_Files_Download-3A

The Parts:

  • 1 Liner
  • 1 Male threaded part
  • 1 Hexagon nut (Female part)
  • 1 Seal ring
   
  • BS4825 SMS type couplings

BS4825_SMS_Coupling_-_3D_CAD_Files_Download-_2D BS4825_SMS_Coupling_-_3D_CAD_Files_Download-_2C BS4825_SMS_Coupling_-_3D_CAD_Files_Download-_2A

The Parts:

  • 1 Liner
  • 1 Male threaded part
  • 1 Round nut (Female part)
  • 1 Seal ring