Catalogue Mantarakis Safety Sings 2019

Gas freeing (with air)
IMPORTANT !
TESTING OF SEA VALVES
(PRIOR ARRIVAL AT LOADING/DISCHARGE PORT)
PRESSURE ON OUTLET SIDE OF
REGULATORS TO BE SET AT MAXIMUM:
2
OXYGEN 8 kg / cm
ACETYLENE 0,8 kg / cm
2
To
Air
Supply
Pressure
Gauge
Block
Valve 2
ÐÑÏÓÏ×Ç !
Ç ÐÉÅÓÇ ÓÔÇÍ ÅÎÏÄÏ ÔÙÍ ÑÕÈÌÉÓÔÙÍ
ÍÁ ÅÉÍÁÉ ÓÔÏ MAXIMUM
Sea
Chest
Sea Chest
Valve
Fitting “Á”
To Strainer
or Vent
Block
Valve 1
Test Fitting
& Valve “B”
2
ÏÎÕÃÏÍÏ 8 kg / cm
ÁÓÅÔÕËÇÍÇ 0,8 kg / cm
P32
2
SCHEMATIC ARRANGEMENT FOR SEA VALVE TESTING
Procedure:
1. Close sea chest valve and block valve 2.
2. Drain water from section of pipe between sea chest valve and block valve 2.
3. Close inboard sea valve (block valve 1).
2
4. Pressurise pipe to approximately 3.5 kg/cm (50 psi)
5. Watch for a pressure drop over 15 minutes.
6. If a pressure drop is noted, check alongside the ship for bubbles of air
escaping
through the sea chest valve. Also check at test fitting B for leakage, if
necessary
using a balloon over the fitting to test for slow leaks.
7. If the inboard and outboard sea valves are tight, block valve 2 may be tested
by
opening the inboard sea valve and closing test fitting B. The line should be
repressurised to about 3.5 kg/cm2
and the pressure drop observed over 15
P54
P56
% HYDROCARBONS
INERTING THE GRAPH (THEORY) AND THE REGULATIONS (REALITY)
Whereas it could be believed that when the O 2 content in tanks has been reduced to below 11% the explosion risks are
gone, nevertheless there are certain additional risks, which have influenced authorities to lower the permissible O 2 level in
tanks.
The main risks are:
a) Inaccuracy of measuring instruments
b) Unusual cargo having a higher flammable range
c) Pockets of O 2 remaining in certain parts of the tank
d) Possible small leaks in system
The flammable area has been marked on the graph and this corresponds to theoretical criteria.
A second envelope, which enlarges the flammable area, is also shown. The additional area has been dotted and
represents the area of safety as perceived by authorities.
These regulations and standards are the results of numerous years of experimentation by oil companies and should be
always followed.
LIMIT
MEASURING INSTRUMENTS
O Below 8%by volume in tanks Portable O Analyzer
Below 5%by volume in lines to tanks Fixed O Analyzer
O
Hydrocarbons Below 2%by volume before gas freeing Tankscope
Hydrocarbons Below 0.01%by volume before human entry (or 1%LFL) Explosimeter
The various operations have been drawn on the graph to illustrate their effect on the gas mixture in tanks.
Primary inerting is shown in red (02
content is reduced from 21% to about 4%) at point A.
Loading or discharging will raise the hydrocarbon content to point B and if COW is carried out the level will rise even
higher to point C.
There is no danger at points A, B or C as they are well outside the flammable area.
However if vessel is gas freed (without purging) from points C or B along lines CO or BO, the mixture at some stage will
enter the flammable area and the tank atmosphere will become a potential explosion hazard.
By purging, shown in green, the hydrocarbons are diluted to below 2% to point D, and gas freeing, shown in blue, can
be safely carried out without ever entering the flammable area.
It should also be emphasized that water-washing tanks is a dangerous operation and should only be performed under
inerted conditions with positive pressure.
In emergency when the IGS h,as broken down washing with water not exceeding 60°C can be carried out one tank at a
P 55
Condition of tank
atmosphere after
cargo operation
without washing
After discharge
(crude oil washing)
Cargo Operation
Purging (with IG)
Crude oil washing
Primary inerting
% OXYGEN
ALWAYS KEEP TANK ATMOSPHERE SAFE AND AWAY FROM DANGER ZONE
W A T E R
O I L S
G A S E S
OTHERS
PIPE IDENTIFICATION MARKING
i
150 mm
100 mm
150 mm
Regulations: The system detailed here conforms to BS 1710, and the colours to BS 4800 standards.
Installation: Prior to application pipes and lagging should be cleared well from oil and dust. Tapes should
be fitted either side of valves, at bulkhead penetrations, “T”s and crosses etc. and at regular intervals. The
tape should be overlapped by at least 20mm on the blind side of the pipe
Sea , river or untreated
Fire mains
Drinking
Cooling (primary)
Hydraulic power
Boiler feed
Condensate
Chilled
0
Heating over 100 C
0
Heating under 100 C
Hot
Cold
Furnace
Diesel
Lubricating
Hydraulic power
Transformer
Compressed air
Vacuum
Steam
Refrigerant 12
Refrigerant 22
Refrigerant 502
Anhydrous ammonia
Other refrigerants
Natural gas
Drainage
Elec. conduits & ventilation ducts
Acids & alkalis
Flow direction arrows
P 53
Green
Green-Red-Green
Green-Auxiliary blue-Green
Green-White-Green
Green-Salmon pink-Green
Green-Crimson-White-Crimson-Green
Green-Crimson-Emerald green-Crimson-Green
Green-White-Emerald green-White-Green
Green-Blue-Crimson-Blue-Green
Green-Crimson-Blue-Crimson-Green
Green-White-Blue-White-Green
Green-White-Crimson-White-Green
Brown
Brown-White-Brown
Brown-Emerald green-Brown
Brown-Salmon pink-Brown
Brown-Crimson-Brown
Light blue
Light blue-White-Light blue
Silver / Grey
Yellow ochre-Blue-Yellow ochre
Yellow ochre-Sea green-Yellow ochre
Yellow ochre-Golden brown-Yellow ochre
Yellow ochre-Dark mauve-Yellow ochre
Yellow ochre-Emerald green-Yellow ochre
Yellow ochre-Light yellow-Yellow ochre
Black
Orange
Violet
Flow arrows
COMMUNICATION GUIDE - for Ship & Bunker Barge
ÏÄÇÃÏÓ ÅÐÉÊÏÉÍÙÍÉÁÓ - ãéá Ðëïßï & Öïñôçãßäá
HOLD - ÊÑÁÔÇÓÇ
WAIT - ÁÍÁÌÏÍÇ
SLOW - ÁÑÃÁ
FAST - ÃÑÇÃÏÑÁ
P79
P52
STOP - ÓÔÁÌÁÔÇÌÁ
P 52
FINISH - ÔÅËÏÓ
MANTARAKIS
38