Styrene monomer polymerises at 65C . Inhibited product can start polymerising >51C with technology of nice heat which may ignite the cargo and rupture the tank.
Colourless clear oily liquid
Candy odour when pure, sharp disagreeable when impure
Marpol category/ Y
MP/ – 30.6ºC
VP/ 6 mm Hg at 20C
TLV/ 50 ppm
Flammable limits/ 1.1 to six.1%
USCG compatibility / 30
Nitrogen pad not accomplished as inhibitor is oxygen dependant.
Uses/ polystyrene, protective coatings, copolymer resins etc.
Odour threshold/ 0.15 ppm
Floor tension / high1.14 dynes/ cm at 19C
Viscosity at 20C/ 1 mPas
Solubility/ Negligible in water, soluble in alcohol and ether
Doesn’t react with water.
Floats on water
Readily undergoes polymerisation when heated or uncovered to gentle or an oxidising / peroxide catalyst. The polymerisation releases heat and may turn out to be explosive. Must be inhibited
Prior loading tank / traces have to be free of oxidising brokers. Cleanliness to water white . If in any respect some shippers do wall wash it will be for suspended particles like zinc dust , rust and lint. Chlorides 10 ppm and colour 10 Apha.
Ensure the manifold sample is obvious and vibrant prior loading.
FOSFA/ Banned as any one of many final two cargoes in organically coated tanks (Epoxy ), and as the last cargo in stainless steel and inorganically coated tanks (Zinc )
Ignited by heat and open flame. Fireplace or contamination might trigger violent rupture of tank
Avoid respiration vapours. Provide body and respiratory protection. Keep tanks cool with water spray.
Suspected carcinogen.Vapour causes moderate irritation to the skin, liquid causes smarting of the skin and first diploma burns on lengthy exposure, inhalation or ingestion causes bodily hurt. Styrene degreases the skin.
Irritates eyes and respiratory tract. Vapors cause weakness, dizziness, nausea andsleepiness. Attacks the nervous system.STEL/ 10 000 ppm may be fatal in 30 to 60 minutes. Product might be absorbed via the skin, mucous,membranes and eyes. Put on protecting clothing
Cargo to not be exposed to excessive heat. Alarm system to observe cargo temperature should be offered
Heating coils in tanks must be blanked.
Stowage adjoining to heated cargoes will not be normally allowed. DOW permits maximumadjacent cargo temperature 30°C.
Styrene monomer creates humidity on the bulkheads of adjacent tanks, due to this fact in case of simultaneous loading of Styrene Monomer and Methanol in adjoining tanks, keep the extent of Methanol at all times 2 three meters greater than level of Styrene Monomer to forestall water contamination of Methanol.Scorching moist vapour condenses on chilly surface.
Styrene is inhibited by 10- 15 ppm PTCB or tertiary butyl acetechol. Styrene may be stabilised by toluene too.
Vessel needs to be provided with “Inhibition Certificatefrom the producer of cargo.
The Certificate should specify:
The title and quantity of additive current
Whether or not the additive is oxygen-dependent
Date additive was put in product and duration of effectiveness
Any temperature limitations qualifying the additive’s efficient lifetime
The actions to be taken ought to the size of voyage exceed the efficient lifetime of the additive.
Styrene Monomer can form polymer residues and in case of epoxy coatingthe hint amount of styrenewill soak intothe paint film and only very slowly desorb.Odour and quality crucial cargoes must not be carried for at least two voyages after the carriage of Styrene in epoxy tanks.
Has low electrical conductivity. Can generate electrical expenses during excessive turbulence.
To stop polymerisation, current tank to surveyor as soon as practical .Never allow styrene to dry on the bulkheads.
Begin washing with chilly sea water onemachine circle and go away it until cleaning is started. Guarantee lines are flushed .
Empty the tank and begin butterworthing with Chilly sea water for 1 hour
Then hot wash with 70C water for 1 hour.
Rinse with recent water.
Steam for 2 hrs to get rid of odour
Drain lines, mop up, dry
Use scent killer solely is the tank is absolutely clean.
If the following cargo is wall wash PTT will likely be a problem. Use inhibiter killer and recirculate. ( If your SS tank shouldn’t be smooth, recirc with a emulsifier.