Maciek.
Brilliant! That`s it, we were fooled by a sketch connection directly to the compressor assuming it was a supplyline from the compressor, forgetting the startingair to the Junker compressor which of course I shouldn't have forgotten. Why was it different on the MAN system? If you look at the system for the MAN engines, the crossover on the system has a pressure of 75 kg/cm2 as the 2nd stage reduction of 75>30 kg/cm2 is on each separate engine thus you cannot use the crossover for starting air supply on the MAN system.On the MAN system the startingair for the Junker is taken from the ordinary HP supplyline of 205 kg/cm2 in the aft torpedoroom where it is connected to the Junker starting valve via an ordinary reductionvalve 205>30 kg/cm2.
Simon, to make it simple: on the GW installations like U1308 and U 995 it is indeed a connection, presumably at least 20mm, from the crossover to the startingvalve of the opposed piston Junker dieselcompressor which was installed on all VIICs after U 97. It is not a supply from the compressors. Thanks to Maciek.
Tore