Technical Specification For Design and supply of Water Mist cum CAFS (Compressed Air Foam System) Backpack Fire Fighting System pg. 1
INTRODUCTION : HPCL is in the process of procurement of Water mist cum CAFS (Compressed Air Foam system) Fire fighting system for its major Installations in India. A Water mist based fire fighting system utilises very fine water spray to extinguish fire. Water is recognised as an outstanding physically acting fire fighting agent with exceptionally high heat absorbing capacity and latent heat of vaporisation. Water droplets with size of 1 to less than 1000 micron are referred to as mist. The water mist when used in fire fighting system creates a blanket thus making the atmosphere inert around the fire. This results in effective and rapid fire extinguishing. The compressed air foam (CAF) used along with water mist further enhances the fire extinguishing power. Water mist fire fighting system covered in this configuration. specification are with Backpack A pressure vessel to hold the media with safety valve, a compressed air cylinder coupled with a reducer, hose pipe for discharge of water mist media and extinguishing gun are the main components covered in the main specification. The system uses a mixture of water and aqueous film forming foam (AFFF) as media. Compressed air is used as propellant for the media through nozzle where atomization takes place. SCOPE : 1. Scope of supply includes Design, manufacture, procurement, inspection and testing of Backpack mounted water mist cum-cafs- fire fighting equipment in the range of minimum 10 Lit to maximum 15 Lit capacity, pneumatically operated through a compressed air cylinder provided with a reducer and high pressure hose at an operating pressure of not less than 9 Bar and not more than 35 Bar for fighting Class A, B and Electrical fire with a single nozzle. The equipment shall have rapid and efficient operating mechanism and maintenance free design. 2. The whole system has to meet the performance ratings as per Clause 6.4.2 & 6.4.3 of EN 3-7 and shall be able to fight fire as per Annexure I on Fire Tests of EN 3 7 for A 43 & B 233 Class fire. One random sample chosen by the purchaser shall be sent for testing at CBRI, Roorkee and for Di-electric test (as per clause 9 of EN 3-7 or IS 15683 of 2006) at ERDA, Vadodara. 3. Equipment shall be new, unused and recent manufacture. 4. Repair facility and list of users for the offered model to be indicated by the vendor/manufacturer. 5. All dimensions are in metric system. 6. The backpack water mist fire fighting equipment shall conform to EN 3-7:2007-10 Standard as applicable for portable type fire extinguishers and fire ratings shall be tested accordingly except for the deviations in weight (which is in excess of 20 Kg), the nominal charge/ capacity (which are specifically mentioned in this specification pg. 2
and the safety feature as specified in para 10.3 (second sub para) of EN 3-7 regarding manual attempt to initiate discharge without releasing the safety device; as the backpack is a different type of configuration from the conventional portable fire extinguishers. 7. The equipment shall include a pressure gauge to monitor air cylinder pressure. The pressure vessels shall be painted red and provide markings as per clause 16.2 of the EN 3-7. The air hoses shall be suitable for minus 40 degree centigrade to 100 degree temperatures and conforming and marking to EN Standards. 8. The Canister (main vessel) hose and nozzle mechanism should have a safety relief system against mal-operation of air regulator which should operate within 1% of maximum allowable operating pressure. 9. The nozzle should be designed to have jet and spray options to be adjusted in-situ without much loss of time. 10. The air cylinder and pressure vessels shall comply with Gas Cylinder Rules 2004 and shall be supported by manufacturers test certificate. No objection certificate or approval as applicable from Petroleum and Explosives Safety Organisation (PESO), Nagpur shall also be furnished. The capacity of the air cylinder should be adequate for minimum two discharges. The air cylinder should be able to generate the design pressure of the Canister (main vessel) after two discharges and should maintain the operating pressure within the manufacturer s permissible range during the course of the discharge. 11. The air regulator should have auto cut off mechanism once the downstream pressure reaches the maximum allowable operating pressure and hold for minimum 2 hrs. 12. All system shall be designed for maximum operating temperature TSmax and minimum operating temperature TSmin of 60 deg C or more and 5 deg C or less respectively and certified by the manufacturer accordingly. 13. The complete system shall be tested from internationally acclaimed laboratory for compliance to EN 3-7 as applicable. Specified fire ratings shall also be tested from such laboratory for back pack configuration. 14. The design of this system should be made as per applicable PED of Europe /IS /ASME pressure vessel code. The testing of the same should be witnessed and certified by a reputed third party inspection agency, like DNV / Llyods/Bureau Veritas and EIL or any other reputed agency approved by purchaser. 15. The manufacturer has to define the water Mist particle size, for which their product has been designed and provide a type test as per Mist particle size test as per EN or any other equivalent National / International codes. 16. For systems built from imported SKD kits the test report as above on OEM products with fire rating test report from a reputed Government Institution like CBRI, Roorkee and ERDA, Vadodara on the product assembled in India after value addition shall also be acceptable. In such cases, supplier shall clearly indicate the value additions made by them in India and shall furnish the specific consent of the OEM for the value pg. 3
additions made along with a confirmation that the fire ratings of the equipment would not be affected by these additions. 17. The whole system should be designed for operation between +5 deg. to +65 deg. centigrade with normal AFFF. However, with addition of anti-freezing additives, system should be able to operate upto 10 deg. centigrade. 18. Backpack configuration shall be mounted on a sturdy frame suitably cushioned for comfort, provided with shoulder pads for carrying as a backpack and a handle to be carried by hand. All materials used shall be of fire retardant type. The supply shall include along with the system, a spare compressed air cylinder of the same size, pressure and material, 10 nos. O-rings for the pressure vessel, one can of 5 L special AFFF compound, tool kit, manufacturers test certificates, operations manual and spare parts list. 19. Product should be guaranteed for minimum 24 months against any manufacturing defect and performance. 20. Field training should be given to at least 5-10 employees of each location (indenting location) including training for regular maintenance. 21. Support for After Sales Service should be provided by the vendor in India. Unit rates for individual components to be given for post warranty replacements, valid for at least 5 years. Unit rates of 5% of all individual components will be loaded for evaluation. Party has to submit unit rates for individual components in Un-priced bid envelope. pg. 4
Technical Specifications of Water mist-cum-cafs Backpack Fire fighting system Sr.no. Description Requirement 1 Working principle The water mist-cum-cafs (compressed air foam system) fire fighting system shall work on 9 to 35 bar pressure with negligible recoil. The system shall be capable of carrying 10 L- 15 L of water in the main vessel. Air cylinder, duly approved by PESO, Nagpur, shall have minimum rating of 2 litre 200 bars to be used for the discharge of fine water mist and CAFS through discharge gun. The same nozzle of the gun shall be suitable to fight Class A, Class B and also live electrical fire without any modification. Gross wt of the charged system along with air cylinder should not exceed 25 KG with plus 10% variation (25 Kg+10%). The system should meet EN 3 standard requirements. 2 Main Vessel Main vessel shall be made of minimum 5 mm thick high grade stainless steel or corrosion free aluminium alloy with water storage capacity of 10 lit to 15 litre and shall be provided with a pressure gauge on top of the vessel as per EN standard. The main vessel (reservoir) shall be handheld and backpacked. Main vessel shall be tested 1.43 times the operating pressure for safety. System shall have the feature of quick recharge without cleaning. The vessel should have No Objection certificate from PESO (Petroleum and Safety Organisation) India. 3 Air cylinder The Compressed air cylinder shall be PESO approved and shall have minimum rating of 2 Lit/200 Bars to be used for discharge of 10L-15L solution with full power. The MOC (Material of construction) of compressed air cylinder shall be Carbon composite material or Stainless steel. The air cylinder ports should be of standard dimensions to enable local refills. 4 Gun The design of the gun shall be such that there is minimum recoil pressure during operation and shall have the locking facility to avoid misuse. The weight of the gun shall be less than 1500 gms. Minimum weight of the gun will be preferred. Nozzle shall be completely stainless steel with SS 304 grade. 5 Weight of fully charged system Weight of the system in fully charged condition shall not be more than 25 KG +10% allowance for comfortable operation. 6 Pressure Safety valve The system shall be provided with a pressure safety valve. The Canister (main vessel) should have manual pressure release facility with pressure gauge. Mechanical inter lock is preferred for canister lid opening and the pressure release mechanism. 7 Hose The hose length shall be minimum 1 meter. Material of hose shall be EPDM or oil resistant synthetic rubber with high tensile steel braid reinforcement having high abrasion, ozone and weather resistant synthetic rubber cover. pg. 5
8 Fire Rating The rating shall be minimum Class A43, Class B233 & Electrical Fire 1000V (Tested at 35KV) shall be as per EN 3 Standard with water and AFFF as extinguishing agent. System shall be capable of achieving A55 rating using special additives/foam. 9 Operating time The operating time shall be more than 20 seconds 10 Lancing distance The minimum lancing distance under test conditions should be 10 meters under jet mode and 5 meter under spray mode. 11 Test Reports/Certificates Test Reports for complete system as per EN 3-7 standard should be submitted. The quoted Model No. should be clearly mentioned in test reports submitted. Additionally, Test reports/certificates shall be submitted from CBRI Fire Engineering Laboratory, Roorkee and ERDA, Vadodara. Model no. shall be clearly mentioned in test reports/ certificates for Class A, Class B and live electrical fire. 12 Automatic cleaning The system shall clean automatically as the remaining air is blown out of the container and system shall be ready for quick second recharge. 13 Backpack Material of backpack shall be heat resistant Polyethylene/ Polyamide/ Nylon 6 material. 14 TPI (Third Party Inspection) Material needs to be inspected by TPI agencies before despatch. Moreover, the testing of the system should be witnessed and certified by a reputed third party inspection agency, like DNV, Llyods, Bureau Veritas, EIL, PDIL and RITES or any other reputed agency approved by HPCL. pg. 6