13 Pressure equipment directives
PED instructions
ZR 110 Pack up to ZR 145 Pack compressors are a pressure assembly of cat. I according to 97/23/EC.
ZR 160 Pack up to ZR 275 Pack compressors are a pressure assembly of cat. II according to 97/23/EC.
ZT 110 Pack up to ZT 275 Pack compressors are a pressure assembly of cat. I according to 97/23/EC.
ZR/ZT 110 Full-Feature up to ZR/ZT 145 Full-Feature compressors are a pressure assembly of cat. III
according to 97/23/EC.
ZR/ZT 160 Full-Feature up to ZR/ZT 275 Full-Feature compressors are a pressure assembly of cat. IV
according to 97/23/EC.
Parts of article 3.3 of 97/23/EC are subject to good engineering practice.
Parts of category I according to 97/23/EC are integrated into the machine and fall under the exclusion of
article I, section 3.6.
Parts subject to the Simple Pressure Vessel Directive 2009/105/IEC are excluded from 97/23/EC according
to article I, section 3.3.
The following pressure bearing parts are of category higher than I :
Compressor type Pressure bearing part
ZR/ZT 110 up to ZR/ZT 275 Safety valve: Category IV
• Design code: AD-Merkblätter, A2
ZR/ZT 110 up to ZR/ZT 145 IMD 300
Compressed air dryer vessel
• Category III
• Design pressure 13.7 bar(e)
• Design code: ASME BPVC section VIII div. 1.
• Material (Cover, housing and bottom): SA-395.
• When pressurized, vessel remains under pressure.
Safety valve (only for option dryer bypass)
• Category IV
• Design code: ISO 4126.
ZR 160 up to ZR 275 Compressor
Heat exchanger at compressed air side (aftercooler)
• Design pressure 13.7 bar(e)
• Design code: ASME BPVC section VIII div. 1.
• Volume 17.6 l.
ZR/ZT 160 up to ZR/ZT 275 IMD 600
Compressed air dryer vessel
• Category IV
• Design pressure 11 bar(e)
• Design code: ASME BPVC section VIII div. 1.
• Material (housing and cover): SA-395.
• When pressurized, vessel remains under pressure.
Safety valve (only for option low load and dryer bypass)
• Category IV
• Design code: ISO 4126.
Instruction book
316 2920 1815 04
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