lpg@12 bulk loading unloading opreration
- 1. 1 LPG LOADING / UNLOADING LPG LOADING / UNLOADING OPERATIONS OPERATIONS
- 2. 2 LPG TANK TRUCKS: REQUIREMENTS OF SAFETY FOR DESIGN/FABRICATION AND FITTINGS All LPG tank trucks should meet the requirements of the Motor Vehicle Acts and Regulations and Static & Mobile Pressure Vessels (Unfired) Rules, 1981 as amended from time to time.
- 3. 3 Fittings: LPG tank truck is provided with the following openings/nozzles: • Safety Relief valves (Two Nos). • Excess flow check valves in the liquid and vapour lines. • Pressure gauge (Provided in the vapour space of the vessel) • Temperature gauge (Provided in the liquid space) • Rotogauge (to measure the percentage of liquid in the vessel. • Manhole with cover. • Drain point at the bottom. • Liquid/Vapour manifold.
- 4. 4 Safety Relief Valve: Safety Relief Valve: There shall be minimum two safety relief valves with each one sized to suit the full relieving capacity of the vessel. The design and operation of Safety Relief Valves shall conform to the provision of SMPV rules as amended from time to time. SRV shall be so installed that it does not project out of the top surface of the vessel. If necessary, recessed cup formation on vessel shall be made to house the SRV. The safety relief valves shall be installed at the top surface around the central portion of the vessel
- 5. 5 Liquid / Vapour Connections: Liquid / Vapour Connections: 1 no. 50 mm size liquid inlet / outlet and 1 no. 40 mm size vapour connection shall be provided at the bottom of the vessel. The vapour line shall extend internally with a clearance of 50 mm from the top of the vessel surface.
- 6. 6 Internal Valve with Excess Flow Check Internal Valve with Excess Flow Check Valve Valve Internal valves with EFCV of appropriate ratings shall be installed on LPG liquid and vapour line
- 7. 7 Liquid Level Gauging Device - Roto Gauge Liquid Level Gauging Device - Roto Gauge The vessel shall be equipped with a liquid level gauging device for ready determination of liquid level in the vessel at any time. The liquid level gauging device shall be of the direct level gauge type with zero leakage of product to atmosphere. The design shall be such that the unit encompasses a tough, durable steel shock absorber to prevent transfer of any vibrations sustained in transit. This liquid level gauging device shall be located on the shell near the midpoint /top upper half of the vessel in a recessed cup formation. To avoid damage to this liquid level gauging device, a suitable hinged cover shall be provided.
- 8. 8 Pressure Gauge Pressure Gauge & & Temperature Gauge Temperature Gauge 1 No. dial type (100 MM) glycerine filled pressure gauge with EFCV shall be provided on the rear dished end in the vapour space. This shall be protected by 10 mm thickness U-type shield metal plate. The range of the pressure gauge shall be from zero to 21 kg/sq. cm (min.) gauge. 1 No. Dial type temperature gauge to be provided.
- 9. 9 VEHICLES VEHICLES GENERAL SAFETY CONSIDERATIONS GENERAL SAFETY CONSIDERATIONS 4. The fuel tank to be protected from external blows by stout steel guards. 5. Safety Equipments: The vehicles shall carry the following: a) A First Aid box. b) 2 nos. 10 Kg DCP (ISI marked fire extinguishers (ISI marked). c) Leather hand gloves and heat resistant hand gloves. d) Safety Goggles e) 2 nos. red flags f) Emergency kit approved by CCOE. g) TREM card. In addition, each vehicle must carry non-metallic tools, wooden plugs of appropriate size and sealing compound for any emergency.
- 10. 10 PURGING PURGING After completion of hydro and pneumatic tests, the bullet shall be purged safely by authorised persons, and only then it should be taken for Loading.
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- 12. 12 UNLOADING OF BULK LPG UNLOADING OF BULK LPG TANK TRUCKS TANK TRUCKS Unloading of LPG from tank truck is carried out with vapour compressors using pressure differential method of liquid transfer. The compressor shall be placed at the unloading point with the following facilities: (i) Vapour line with isolation valves (ii) Product transfer line with isolation valves (iii) Weigh bridge of suitable capacity
- 13. 13 • All electrical equipment/ lighting are of flameproof type • Vapour vent line should be for individual bay at 1.5 M height above the eaves of the shed fitted with flame cap • Fire Extinguishers, shall be positioned as an immediate aid to fight fire. • No hot work/ cold work is carried out in the vicinity of unloading operation. • Checks shall be carried out for each T/T and T/W prior to unloading of LPG as per check list . SAFETY PRECAUTIONS DURING UNLOADING OF SAFETY PRECAUTIONS DURING UNLOADING OF LPG LPG
- 14. 14 PROCEDURE FOR UNLOADING TANK PROCEDURE FOR UNLOADING TANK TRUCKS TRUCKS 1. Checks essential for plant safety shall be carried out for each Tank Truck Before its entry to the licensed area . 2. Tank pressure, temperature and weight of filled tank truck shall be recorded before Unloading. 3. Tank shall be placed in drive out position with entire tank truck consisting of bullet and engine covered by sprinklers. 4. After placement, engine as well as master control switch shall be switched off and minimum four wooden chokes shall be placed under wheels.
- 15. 15 PROCEDURE FOR UNLOADING TANK PROCEDURE FOR UNLOADING TANK TRUCKS TRUCKS 5. Following shall be connected - • Chassis and bullets both are to be earthed independently for which bare metal cleats to be provided. • Earth pits should meet IS:3043, Earth Resistant should be <1 ohm. • Liquid and vapour hoses to tank trucks after examining the integrity of gaskets and using proper studs. Bolts and nuts are not be used. • Earthing lines to tank bare metal or earthing point to tank.
- 16. 16 PROCEDURE FOR UNLOADING TANK PROCEDURE FOR UNLOADING TANK TRUCKS TRUCKS 6. The tank truck valves shall be crack opened and ensured there are no leaks. The working of EFCV to be tested by opening valve at once to give sudden flow. 7. After the above, unloading should be done with LPG compressor by differential pressure method. 8. Pressure and level in the tank truck shall be monitored at regular intervals so that it does not exceed safe limits. After decanting all liquid LPG, close the valve of liquid line of the bay. Thereafter, LPG vapour should be recovered such that vapour pressure in the tank truck is brought down to 1.5 kg/cm2 minimum but not below atmospheric pressure.
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- 18. 18 PROCEDURE FOR UNLOADING TANK PROCEDURE FOR UNLOADING TANK TRUCKS TRUCKS 9. On completion of unloading, following operations shall be done in sequence: Isolate rigid liquid and vapour lines of bay by closing the valves and stop LPG compressor. Close the valves of liquid/ vapour lines of the tank truck. Depressurise the hose through high vent - close vent valve. Remove hose connections, electrical bonding wires. Cap the vapour/ liquid outlet lines of tank trucks. Remove chokes placed under wheels. 10. Record the weight of empty tank truck along with rotogauge, pressure gauge and temperature gauge readings.
- 19. 19 IMPORTANT NOTES IMPORTANT NOTES 1. HMV LICENSE DULY ENDORSED BY RTO. 2. TREM CARD 3. FITNESS CERTIFICATE 4. EXPLOSIVE LICENSE 5. VENTING PROCEDURE 6. EMERGENCY KIT 7. 10/9 KG DCP FIRE EXTINGUSHERS 8. CLEANER 9. TRAINING ON SAFE TPT OF LPG
- 20. 20 Safety during lightening Safety during lightening 1. Do not vent LPG in case of lightening 2. Individual vent line for each line 3. Structural earthing – 2 points 4. No Lightening arrestor 5. Earthing to Vent pipe line 6. Vent P/L terminating at T point, with bend arm projecting downward with copper mesh. 7. Close Trees should be away from the shed.
- 21. 21 NEW NEW design design LOADING ARM LOADING ARM Loading arm used for loading/unloading of LPG in Tank Trucks. ERC is main component of loading arm to decouple the arm from tank truck with out any leakage of LPG in case of emergency
- 22. 22 Thank You