Plasticised Pitch is a coal tar based hot-pour pipe coating material prepared by digesting solution of pitch and high boiling
PLASTICISED PITCH AWWA
DESCRIPTION Plasticised Pitch is a coal tar based hot-pour pipe coating material prepared by digesting solution of pitch and high boiling coal tar distillate modified by inert mineral filler. This is Tar Enamel in the coating industry.
CHARACTERISTICS EnamelType I EnamelType II Testing Min Max Min Max Methods Softening point (R&B), °C 104 116 104 116 ASTM D36 Filler content, % by weight 25 35 25 35 ASTM D2415 Fineness of filler, 200 mesh, 90 - 90 - ASTM D546 % by weight Specific gravity at 25°C 1.4 1.6 1.4 1.6 ASTM D71 Penetration Test 25°C/100g/5 sec/0.1 mm 5 10 10 20 AWWA C203 46.1°C/50g/5 sec/0.1 mm 12 30 15 55 Sec. 5. 3. 2
High temperature sag test AWWA C203 At 71°C, mm - 1.6 - 1.6 Sec. 5. 3. 4 Low temperature cracking test AWWA C203 At -23.3°C - none N/A N/A Sec. 5. 3. 5 Low temperature cracking test AWWA C203 At -28.9°C N/A N/A - none Sec. 5. 3. 5 Impact test at 25CC (disbonded area, mm2) Direct - 10323 - 6452 AWWA C203 Indirect - 3871 - 1290 Sec. 5. 3. 7 Peel test No Peeling No Peeling AWWA C203 Sec. 5. 3. 6 Dielectric strength, 10 8 ASTM D 176 1mm, KV, min Volume Resistivity, 1013 1012 ASTM D 257 Ohm Cm, min Recommended application 235 to 250 230 to 250 temp, °C Recommended pipe pre- 40 to 50 40 to 50 heating temperature, °C Recommended pipe surface 65 to 80 65 to 80 profile, microns Recommended DFT of 15 to 3015 to 30 synthetic primer, microns Recommended in service -25 to +65 -30 to +55 temperature, °C
STANDARDS We have the facilities to manufacture and assure quality of Plasticised Pitch conforming to the latest edition of AWWA C203. We also manufacture Plasticised Pitch conforming to the latest editions of other recognized international standards, such as BS 4164, IS-9912, 1S-10221 or any other specification.
ADVANTAGES Plasticised Pitch provides a long-term protection to underground steel pipelines when used along with Jet Set Primer. This system has been in use throughout India and abroad for over 40 years. Use of Plasticised Pitch has the following advantages: - Excellent adhesion to metal - Corrosion protection - High water resistance - High electrical resistivity - Cathodic disbonding resistivity - Resistance to bacteria and marine organisms - Root growth penetration resistance - Resistance to damage due to impact of backfill - Resistance to petroleum products - Good flexibility and temperature susceptibi ity - Chemical stability
APPLICATION METHODOLOGY Depending upon the size of the melting kettle, Plasticised Pitch is to be cut into small pieces of approximately 1 to 5 kg each. The kettle is to be filled to 40% of its capacity and heating to be started. After attaining fluidity the balance material is to be slowly added till it reaches the application temperature. The material is to be stirred occasionally to avoid carbonization at the bottom of the kettle. This will prevent coking of the material and save considerably on fuel. The material should be maintained at the application temperature for not more than 3 hours and the entire quantity should be consumed during this period. The quantity of enamel remaining in the kettle on reheating should not exceed 10% of the fresh charge. The maximum temperature of the kettle should never exceed 260°C and enamel above this temperature should be rejected. Enamel held at the application temperature for more than 3 hours also to be rejected (when tested, if it is found off-specification). In the event of plant breakdown, or for any other reason, burner should be put off and the enamel temperature to be brought down to 180°C or lower, keeping agitator on for a period not exceeding 8 hours. The enamel should not be applied to a primed pipe when metal temperature is below 7°C and care should be taken to ensure that the pipe is free from dust, dirt, oil and moisture.
STORAGE - No special requirements for storage - Should be stored in a clean place to avoid contamination - Breaking up enamel into smaller pieces is easier when the ambient temperature is low.
QUALITY CONTROL Plasticised Pitch is manufactured under stringent quality control. Our Company maintains its own laboratory and scientific staff to monitor the manufacture and testing of the enamel to the recognized standards.
TECHNICAL SERVICES Other technical data and advice are available on request. STP Limited leads the world in the quality and expertise of its technical support services. A company executive will reach anywhere in the world at minimal notice to assist with site application problems, should they arise, or to provide help with the commissioning of new coating plants.
HEALTH AND SAFETY - Usage of gloves and filter-type mask is recommended in the application area. - Do not smoke when using Plasticised Pitch. - In case of fire, use C02 dry powder or fine water spray. - There should be adequate ventilation in areas of application. - Do not use solvents to wash skin. - Eye protection is recommended at all times. In case of accidental contact, wash with cold water and seek medical help immediately. - Barrier cream should preferably be applied for skin protection before commencement of work. In case of skin contact with hot enamel, immerse in cold water.
PACKAGING - 250 kg steel drums - 125 kg steel drums - Special packs and packaging materials are also available on request - Drums and bags are colour-coded for easy identification and marked with grade and batch number.