Date: November 2016
Issue No: 2
Crewsaver -
Servicing Manual : Inshore 380N Lifejacket
Page
of 31
17
5
Section
PROCEDURE FOR THE INSPECTION AND SERVICING OF MANUAL HEADS AND CYLINDERS WITH LEVELS OF
CORROSION
5.3.3
INITIAL INSPECTION
Unscrew the cylinder from the automatic or manual head. If corrosion is present it will be seen as one of the following:
a)
A white/grey powdery deposit on the cylinder and in the thread recess of the head.
b)
A red rusty surface to the cylinder.
5.3.4
PROCEDURE FOR WHITE/GREY POWDERY DEPOSIT
5.3.4.1 All CO cylinders showing signs of white rust and no pitting are
2
considered fit for purpose. If the white/grey deposit is seen then both the
cylinder and head can be reused after cleaning. Brush out the threads
with a stiff bristled nylon brush (M.E.C. Reference Br1)
Cylinder showing white rust on thread
5.3.4.2 Blow out the threaded recess of the head and check that there are no significant particles or bristles from the brush
across the sealing washer in the base of the recess. Check that the sealing washer is not damaged, either from
cleaning or use, and will provide a good seal. Replace if damaged.
5.3.4.3 Check that the head operates freely.
5.3.4.4 If any white/grey powdery deposit is present on the body of the cylinder within the areas shown in Section 4 then it
should be brushed or wiped off.
5.3.4.5 Re-assemble the cylinder to the manual or auto head.
5.3.5
PROCEDURE FOR RED RUSTY SURFACE
Cylinder showing red rust
5.3.5.1 If a red rusty surface is seen on the cylinder this means that the protective
zinc coating has been penetrated and the steel is corroding.
5.3
Gas Cylinders (cont.)
