388-Methanol Operations / 748
Met
h
anol
Op
erations
BOS-PRD-07.900609
4
.
2
.
3 B
lanketin
g
o
f m
et
h
anol tank
Blanketing of Methanol tank with N2
Fill in the nitrogen bottles with the nitrogen generator. The nitrogen plant room
shall
be kept closed to avoid
nitrogen to fill other rooms. This room
shall
be equipped with an O2 sensor, and access is restricted only to
intervention on nitrogen system or other critical equipment by authorized persons. The person entering the
room for the purpose
shall
check the O2 level and carry an EEBD with him. A second person shall stand
outside, ready in case of nitrogen sudden release. Ventilation is kept on in this room during the whole
loading, this one
shall
be shut off immediately if a methanol release is expected on main deck.
Blanket the discharge pipe with nitrogen before tank blanketing is started.
Ensure that all discharge valves are closed.
Fill cofferdams with nitrogen. FW can be used as back-up.
Load methanol tanks with nitrogen, air is evacuated through the PV Valve. Remaining O2 shall not exceed
8% (IMO requirement IBC 19.8.3) to consider the tank as blanketed/inerted, and the pressure
shall
be
positive just over 0 bar.
depending on the vessels, this step requires around 36 hours.
Nitrogen shall be injected as slow as possible to avoid any mixing with air.
Check O2 rate from the PV Valve with portative gas detector.
Once the tanks are inerted and prior to load methanol, nitrogen bottles
shall
be fully filled.
The tanks are ready to receive methanol.
Version 04. Original date: 22/06/2012. Version date: 31/12/2014. Valid version only on QMS site. Uncontrolled document when printed.
Procedure prepared by: BOS Head of Operations. Approved by: BOS Head of Operations. Validated by: BOS Quality Representative.
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