Compressed air

VSH XPress and compressed air are a combination used very frequently. Depending on water and oil content different choices in material and O-rings are available. 

The leak tightness of VSH XPress Stainless for compressed air installations is backed up by the TA-Luft approval.

Compressed air installation
VSH XPress Carbon fittings with zinc plated precision carbon steel tubes which fulfill EN 10305-3 or VSH XPress Stainless fittings with stainless steel tube which fulfill EN10312.

VSH XPress Carbon fittings with zinc plated precision carbon steel tubes can be used for compressed air if following conditions are observed:
Water contents: max. 880 mg/m3, class 3, ISO 8573 part 1
Oil contents: max. 25 mg/m3, class 5, ISO 8573 part 1

When exceeding the maximum water content then VSH XPress Copper or Stainless steel should be used. For oil containing compressed air based on mineral or vegetable oil use FPM O-rings. EPDM O-rings can only be used for synthetic oil or dry compressed air (not exceeding 25 mg/m3).
 

  • O-rings: EPDM (black)
  • Operating temperature: -35°C to +135°C
  • Operating pressure: 12-54 mm max. 16 bar
    66,7 - 108 mm max. 10 bar
     
  • O-rings: FPM (green)
  • Operating temperature: -20°C to +200°C
  • Max. temperature (short term) 230°C
  • Operating pressure: 12-54 mm max. 16 bar
    66,7 - 108 mm max. 10 bar
     
Class
Water content [mg/m3]
Oil content [mg/m3]
O-ring
1
3
0,01
EPDM
2
120
0,1
EPDM
3
880
1
EPDM
4
6.000
5
EPDM
5
7.800
25
EPDM
6
9.400
>25
FPM (green)

Table: ISO-class for compressed air and advised O-ring
 

VSH XPress Copper fittings with copper tubes which fulfill EN 1057 R220/R250/R290.
 

  • O-rings: EPDM (black)
  • Operating temperature: -20°C to +110°C
  • Operating pressure: max. 10 bar
     
  • O-rings: FPM (green)
  • Operating temperature: -30°C to +200°C
  • Max. temperature (short term) 230°C
  • Operating pressure: max. 10 bar
     

Installation instructions
On completion, compressed air pipeline systems must be properly tested. The system designer and installation contractor must ensure safe methods are selected for system testing which will comply with all current health and safety regulations. This may include testing compressed air lines with fluids or compressed air at a limited pressure, or a combination of both. After the installation the compressed air installation should be pressure tested according the valid local guide lines. In any event we do not recommend the maximum working pressure of the product to be exceeded during this procedure. Since 30th May 2002 most pressure equipment and assemblies on the market have had to comply with the Pressure Equipment Directive (P.E.D.) 1999. The Directive concerns items such as vessels, pressurised storage containers, heat exchangers, steam generators, boilers, industrial piping, safety devices and pressure accessories. Please note that the P.E.D. applied on XPress refers to article 3, sub. 3. This means that only sound engineering and a safe instruction for use and maintenance are required.