MTU 12V4000M73 series Operating Instructions Manual page 44

High-pressure connections
1 Jacketed pipe
2 HP line
3 O-ring
4 Union nut
5 Recess for O-ring
6 Thrust ring
7 Leak overflow bore
The HP fuel line is sealed by the thrust ring (8).
In case of leakage around the thrust ring (8) or the HP line (5) fuel escapes into the leakage chamber.
The leaking fuel is drained off without pressure via the leak overflow bore (7). The leakage chamber is sealed
toward the outside by the O-rings (3).
This prevents leakage egress.
The union is confirmed as being SOLAS-compliant by DNV and GL.
42 | General Information | MS150045/03E 2018-08
8 Thrust ring
9 Union nut
10 Union nut
11 Connecting piece
12 Snap ring
13 Thrust ring
14 Compensating washers
15 Union nut
16 Thrust ring
17 HP line outer tube
18 HP line inner tube
19 Ball-type seal area
20 Leak fuel connection