Ingangsdatum: 06-04-1987
4.20 - Hydrogen peroxide solutions
Hydrogen peroxide solutions over 60% but not over 70%.
4.20.1 Hydrogen peroxide solutions of over 60%, but not over 70% should be carried in dedicated ships only and no other cargoes should be carried.
4.20.2 Cargo tanks and associated equipment should be either pure aluminium (99.5%) or solid stainless steel (e.g. 304, 304L, 316, 316L, 316Ti) and passivated in accordance with approved procedures. Aluminium should not be used for piping on deck. All nonmetallic materials of construction for the containment system should neither be attacked by hydrogen peroxide nor contribute to its decomposition.
4.20.3 Pump-rooms should not be used for cargo-transfer operations.
4.20.4 Cargo tanks should be separated by a cofferdam from fuel-oil tanks or any other space containing flammable or combustible materials.
4.20.5 Tanks intended for the carriage of hydrogen peroxide should not be used for seawater ballast.
4.20.6 Temperature sensors should be installed at the top and bottom of the tank. Remote temperature readouts and continuous monitoring should be located on the bridge. If the temperature in the tank rises above 35°C, visible and audible alarms should activate on the navigating bridge.
4.20.7 Fixed oxygen monitors (or gas-sampling lines) should be provided in void spaces adjacent to tanks to detect leakage of the cargo into these spaces. Remote readouts, continuous monitoring (if gas-sampling lines are used, intermittent sampling is satisfactory) and visible and audible alarms similar to those for the temperature sensors should also be located on the navigating bridge. The visible and audible alarms should activate if the oxygen concentration in these void spaces exceeds 30% by volume. Two portable oxygen monitors should also be available as back-up systems.
4.20.8 As a safeguard against uncontrolled decomposition, a cargo-jettisoning system should be installed to discharge the cargo overboard. The cargo should be Jettisoned if the temperature rise of the cargo exceeds a rate of 2°C/h over a 5 h period or when the temperature in the tank exceeds 40°C.
4.20.9 Cargo-tank venting systems should have pressure/vacuum-relief valves for normal controlled venting and rupture discs or a similar device for emergency venting should tank pressure rise rapidly as a result of uncontrolled decomposition Rupture discs should be sized on the basis of tank design pressure, tank size and anticipated decomposition rate.
4.20.10 A fixed water-spray system should be provided for diluting and washing away any concentrated solution spilled on deck. The areas,is covered by the water-spray should include the manifold/hose connections and the tank tops of those tanks designated for tarrying hydrogen peroxide The minimum application rate should satisfy the following criteria:
- The product should be diluted from the original concentration to 35% by weight within five minutes of the spill.
- The rate and estimated size of the spill should be based upon maximum anticipated loading and discharge rates, the time required to stop flow of cargo in the event of tank overfill or a piping/hose failure, and the time necessary to begin application of dilution water with actuation at the cargo-control location or on the navigating bridge.
4.20.11 Hydrogen peroxide should be stabilized to prevent decomposition. A certificate of stabilization should be provided by the manufacturer specifying:
- name and amount of stabilizer added;
- date stabilizer was added and duration of effectiveness;
- any temperature limitations qualifying the stabilizer's effective lifetime;
- the action to be taken should the length of voyage exceed the effective lifetime of the stabilizer.
4.20.12 Only those hydrogen peroxide solutions which have a maximum decomposition rate of 1.0% per year at 25°C should be carried. Certification from the shipper that the product meets this standard should be presented to the master and kept on board. A technical representative of the manufacturer should be on board to monitor the transfer operations and have the capability to test the stability of the hydrogen peroxide. He should certify to the master that the cargo huts been loaded in a stable condition.
4.20.13 Protective clothing that is resistant to hydrogen peroxide should be provided for each crew member involved in cargo-transfer operations. Protective clothing should include coveralls that are nonflammable, suitable gloves, boots and eye protection.
4.20.14 As a condition of carriage of this product, the ship should meet the code in full, as would be applicable to a ship constructed after 14 June 1983. Hydrogen peroxide solutions over 8% but not over 60% by weight
4.20.15 The ship's shell plating should not form any boundaries of tanks containing this product
4.20.16 Hydrogen peroxide should be carried in tanks thoroughly and effectively cleaned of all traces of previous cargoes and their vapours or ballast. Procedures for inspection, cleaning, passivation and loading of tanks should be in accordance with MSC/Circ.394. A certificate should be on board the vessel indicating that the procedures in the circular have been followed. The passivation requirement may be waived by an Administration for domestic shipments of short duration. Particular care in this respect is essential to ensure the safe carriage of hydrogen peroxide.
- When hydrogen peroxide is carried, no other cargoes should be carried simultaneously.
- Tanks which have contained hydrogen peroxide may be used for other cargoes after cleaning in accordance with the procedures outlined In MSC/circ. 394.
- Consideration in design should provide minimum internal tank structure, free draining, no entrapment and ease of visual inspection .
4.20.17 Cargo tanks and associated equipment should be either pure aluminium (99.5%) or solid stainless steel of types suitable for use with hydrogen peroxide (e.g. 304, 304L, 316, 316L, 316Ti). Aluminium should not be used for piping on deck. All nonmetallic materials of construction for the containment system should neither be attacked by hydrogen peroxide nor contribute to its decomposition.
4.20.18 Cargo tanks should be separated by a cofferdam from fuel-oil tanks of any other space containing materials incompatible with hydrogen peroxide.
4.20.19 Temperature sensors should be installed at the top and bottom of the tank. Remote temperature readouts and continuous monitoring should be located on the navigating bridge. If the temperature in the tank rises above 35°C, visible and audible alarms should activate on the navigating bridge.
4.20.20 Fixed oxygen monitors (or gas-sampling lines) should be provided in void spaces adjacent to tanks to detect leakage of the cargo into these spaces. The enhancement of flammability by oxygen enrichment should be recognized, Remote readouts, continuous monitoring (if gas-sampling lines are used, intermittent sampling is satisfactory) and visible and audible alarms similar to those for the temperature sensors should also be located on the navigating bridge. The visible and audible alarms should activate if the oxygen concentration in these void spaces exceeds 30% by volume. Two portable oxygen monitors should also be available as back-up systems.
4.20.21 As a safeguard against uncontrolled decomposition, a cargo-jettisoning system should be installed to discharge the cargo overboard. The cargo should be jettisoned if the temperature rise of the cargo exceeds a rate of 2°C/h over a 5 h period or when the temperature in the tank exceeds 4 0°C.
4.20.22 Cargo-tank venting systems with filtration should have pressure/vacuum-relief valves for normal controlled venting and a device for emergency venting should tank pressure rise rapidly as a result of an uncontrolled decomposition rate, as stipulated in 4.20.21. These venting systems should be designed in such a manner that there is no introduction of seawater into the cargo tank even under heavy sea conditions. Emergency venting should be sized on the basis of tank design pressure and lank size
4.20.23 A fixed water-spray system should be provided for diluting and washing away any concentrated solution spilled on deck. The areas covered by the water-spray should include the manifold/hose connections and the tank tops of those tanks designated for the carriage of hydrogen peroxide solutions. The minimum application rate should satisfy then following criteria:
- The product should be diluted from the original concentration to 35% by weight within five minutes of the spill.
- The rate and estimated size of the spill should be based upon maximum anticipated loading and discharge rates, the time required to stop flow of cargo in the event of tank overfill or a piping/hose failure, and the time necessary to begin application of dilution water with actuation at the cargo-control location or on the navigating bridge.
4.20.24 Hydrogen peroxide should be stabilized to prevent decomposition. A certificate of stabilization should be provided by the manufacturer specifying:
- name and amount of stabilizer added;
- date stabilizer was added and duration of effectiveness;
- any temperature limitations qualifying the stabilizer's effective lifetime;
- the action to be taken should the product become unstable during the voyage.
4.20.25 Only those hydrogen peroxide solutions which have a maximum decomposition rate of 1.0% per year at 25°C should be carried. Certification from the shipper that the product meets this standard should be presented to the master and kept on board. A technical representative of the manufacturer should be on board to monitor the transfer operations and have the capability to test the stability of the hydrogen peroxide. He should certify to the master that the cargo has been loaded in a stable condition.
4.20.26 Protective clothing that is resistant to hydrogen peroxide should be provided for each crew member involved in cargo-transfer operations. Protective clothing should include coveralls that are nonflammable, suitable gloves, boots and eye protection.
4.20.27 During transfer of hydrogen peroxide, the related piping system should be separate from all other systems. Cargo hoses used for transfer of hydrogen peroxide should be marked "FOR HYDROGEN PEROXIDE TRANSFER ONLY"