This AD 2000-Merkblatt applies to pressure-bearing accessory housings and safety accessory housings for pressure vessels and piping with a maximum allowable pressure (PS) exceeding 0,5 bar.
Clauses 4 to 8 of this AD 2000-Merkblatt, excluding 6.4.1, do not apply to accessory housings in refrigeration and heat-pumping plant, see AD 2000-Merkblatt HP 801 No. 14 "Druckbeh？lter in K？lteanlagen und W？rmepumpenanlagen" (Pressure equipment in refrigerating and heat-pumping plant).
AD 2000-Merkblatt A4-2015 history
2015AD 2000-Merkblatt A4-2015 Equipment, installation and marking of pressure vessels.Accessory housings