| Hydrant Fire Fighting Systems |
| Introduction |
A well designed and well laid hydrant system is the back bone of the entire fire fighting equipments as it fights fire of serious proportions in all classes of risks and continues to be in full operation even if parts of affected buildings and or structures have collapsed and also keeps cool all adjoining properties thereby minimizing the exposure hazards.
It also has the advantage of providing for possible future extensions in any scheme of hydrant protection with mains of what larger capacity than immediate requirement at small additional cost.
The efficiency in fire fighting will ultimately depend upon the rapidity with which it is brought into action and the ability with which its efforts directed.
The maintenance of an installation is equally vital and the importance of organized wet drills at regular intervals which ensure that each man carries out his allotted duties in the shortest possible time is strongly emphasized. |
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| Classification of occupancies |
| As the Water Supply, Pumping Capacity and other features of the Hydrant System depend not only on the size of the risk but also on its fire growth and spread potentialities. The risks are to be categorized under the following classes for the purpose of Hydrant System Design. |
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Light hazard occupancies |
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Ordinary hazard occupancies |
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High hazard occupancies (a) |
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High hazard occupancies (b) |
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| Water Supply |
| Water for the hydrant service shall be stored in any easily accessible surface under ground-lined reservoir or above ground tanks of steel, concrete, or masonry. The effective capacity of the reservoir (Above the foot valve seat in case of negative suction and above the level of the top of pump casing in case of positive suction) will differ for various clauses of occupancies and the size of hydrant installations. The reservoir will exclusively be reserved for hydrant service only. |
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| Electric Supply |
| The electric supply to the pumping sets shall be entirely independent of all other equipments in the premises i.e. even when the power throughout the entire premises is switched off the supply to the pump shall continue to be available uninterrupted. This can be achieved by taking the connection for pumps from the incoming side of the main L.T. Breaker. |
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| Salient Features Of Hydrant System |
| Automatic System |
Generally the ring main and wet riser shall be charged with water at a pressure of 7kg\sq.m. If there is any pressure loss due to minor leakage in the pipeline or due to evaporation, the jockey pump which will be set at a pressure will come into operation and maintain the required pressure in the pipeline. On operation of one or more hydrant points, pressure will fall down. This fall in pressure will actuate the pressure switch set at a particular set point lower than the jockey pump. This will send the control signal to the motor switchgear, thereby bringing the motor driven pump into operation thus replenishing the loss of pressure. Incase the motor driven pump does not come into operation due to power failure or malfunction, pressure in the line will further fall down actuating a second pressure in the line will further fall down actuating a second pressure switch set at a further lower set level. This will automatically make the standby diesel engine pump to operate, supplying water to the system. Invariably switching off of both the pumps shall be manual.
The unlined flex canvas hoses and allied equipments will be housed in a metal chamber and will be located around the buildings with metal frame glass shutters and also inside the high risk building near by the internal Hydrant Valves.
The Controlled Percolating hoses provided will be as per I S 8423 and T A C approved make. |
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| Components Involved In The Design Of System |
| Client |
| Fire pump |
| The fire pump shall be multi end suction centrifugal pump with cast iron casing, bronze impeller, steel shaft and gland packing. |
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| Jockey fire pump |
The Jockey fire pump shall be electrically powered and of the end suction centrifugal type.
The pump spread shall be 3000 RPM and designed to deliver 3 LPS at 56 Mtrs head. |
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| Motor |
| The motors for the fire pump and jockey fire pump shall be T E F C squirrel cage induction type and sized for minimum output at an ambient temperatures of 40oC. The motors shall be suitable for electric supply of 30 KW 415 V 3 phase 50 cycles, subject to permissible variation and frequency. |
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| Star delta starter panel (main pump) |
| The main pump motor shall be individually controlled by automatic star delta starters with reference to respective rating. |
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| Star delta starter panel (jockey pump) |
| The jockey pump motor shall be individually controlled by automatic star delta starters with reference to respective rating. |
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| Diesel engine and control gear: (optional) |
| The diesel engineer shall be turbo charged engine and rate for 60HP at 1800 RPM direct injection four stroke six cylinder water cooled engine. |
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| Diesel engine control panel: (optional) |
| The diesel engine control panel shall be fully automatic. The panel shall be floor mounting type. |
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| Pipes and fittings |
| All above ground piping and fitting shall be of M S medium grade as per I S 1239\1979\ Part I and Part II. |
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| Valves |
| Valves shall be provided as specified in the bill of quantity and to pressure rating as applicable. |
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| Hoses |
| Hoses shall be of Controlled Percolation type with I S 8423, TAC approved make. |
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| Pipe installation |
| All pipes will be laid as per the norms provided in the T A C manual. |
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| Terms And Conditions |
| Client |
| This offer is subject to the following terms and conditions in addition to any specified in the covering letter, specification sheet etc. |
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| Labour |
| Our offer includes for the provision of all labour, skilled and unskilled supervisory and Engineering charges required for the successful completion and commissioning of the entire job. |
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| Civil works |
| Our offer is inclusive of all civil works as mentioned in the price schedule, but construction of Pump house , foundation of pumps, construction of reservoirs and provision of puddle flanges, etc. are not included in our scope. |
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| Taxes and duties |
| Sales tax wherever applicable will be charged extra and works contract tax if any shall be paid extra. |
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| Validity |
| Our offer shall be valid for 60 days. If the order is placed before the validity period, our prices shall be firm till the completion of the entire contract. However, if we are asked to extend the validity period of our present offer, our prices shall be subjected to our confirmation. |
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| Delivery |
| The entire system will be completed within 3 months subject to availability of site. Provided all drawings/information required by us to start detailed engineering and are given to us within one week’s time from the date of request. |
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| Force majuere |
| The delivery period has been calculated as accurately As possible, but we cannot be held responsible for the delay caused due to war, insurrection, restraint imposed due to Government acts of legislature, failure of electricity, Hindrance or scarcity of raw materials or any whatsoever beyond our control. |
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| Guarantee |
| Our system is guaranteed for good performance for a period of 12 months from the date of commissioning. |
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| Price variation |
| Our prices shall remain firm till the completion of the contract provided the order is placed on us before the validity period. |
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Excess Of Materials |
| Normally we supply materials more than what are required actually at site, to ensure steady and continuous progress of work. Therefore, all materials and consumables which are found surplus on completion of the job shall remain our property and shall be returned to us along with our erection tools. |
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| Terms of payment |
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50% advance along with the order. |
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40% on supply of materials at site, |
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5% on successful completion of the work. |
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5% after 15 days from the date of commissioning on satisfactory performance of the system. |
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| Destination |
| Our prices are based on F.O.R site basis. |
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| Jurisdiction |
| All disputes that may arise will be subjected to the jurisdiction of Chennai Courts only. |
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| General |
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The following will have to be provided by your free of cost: |
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Storage for our materials tools and tackles etc. |
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Water Electricity for erection and testing of the system. |
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Site clearance to work uninterrupted. |
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Schedule Of Purchaser’s Scope Of Work |
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Power and water as required for erecting, testing and commissioning of the system.] |
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To provide work space for our site office and works. |
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To provide necessary lighting at work space as and when necessary and also to provide electrical points at our site office and wherever required. |
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To provide with all necessary drawings of site and equipments required by us to design the system. |
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If on account of underground obstructions such as rock, electrical cables or other services lines, we are required to provide additional materials, the extra cost involved would be to your account. |
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All external staircases, fire proof doors, segregations, dyke walls, puddle flanges, etc., as per insurance regulations should be provided by you. |
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All necessary sleeves in roof, walls, columns, etc., wherever required. |
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All necessary approaches to control valves, pump, engine etc. |
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All necessary external housing for hose cabinets, yard hydrants, and deluge valves etc., wherever required. |
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All civil works such as construction of pump house, reservoir, foundations etc. |
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Power cables and control cables for the pump house. |
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All necessary shut down and clearance for us to carry our erection work whenever required. |
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Providing all necessary declaration, confirmation with regard to plant process, reservoir details, staircase details, water supply inlet details etc. |
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Data Sheet |
| Underground Pipes |
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Make |
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jindal / asrani / prakash / asrani |
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Material |
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Mild Steel |
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Specifications |
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IS 1239/3589 |
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Type of Coating |
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IS 10221 |
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TAC Approval |
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Yes |
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| Aboveground pipes & fittings |
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Make |
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jindal / asrani / prakash / asrani |
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Material |
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Mild Steel |
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Specifications |
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IS 1239/ (Part I)/3589 |
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Class |
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Medium |
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Type of joint |
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Welded |
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TAC Approval |
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Yes |
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Fittings |
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IS 1239/Part II |
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| Butterfly Valves |
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Make |
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Intervolve / Audco |
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Material |
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As per tender specs |
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Type |
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Butterfly |
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Specifications |
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BS 5155 |
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| Fire Pump (Both Motor driven & Diesel driven) |
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Make |
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Cromption / Kirloskar |
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Capacity |
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47 ltrs/sec |
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Head |
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70 mtrs |
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Type |
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End suction, Top discharge, Back pullout type |
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Drive |
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Motor / Engine |
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Accessories |
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Base Plate, Foundation Bolts, ETC. |
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| Diesel Engine (Optional) |
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Make |
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Kirloskar Brothers / Crompton Greaves |
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Rating |
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90 HP at 1800 RPM |
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| Motor |
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Make |
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Cromption Greaves / Kirloskar |
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Enclosure |
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TEFC |
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Rating |
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55 KW/75 HP |
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| Hydrant Valve |
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Make |
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Newage / Sukan |
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Body |
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Gun Metal |
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IS Specification |
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5290 |
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Outlet Size |
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63 mm dia. |
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TAC Approval |
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YES |
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| Controlled Percolation Hose |
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Make |
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Jayashree / Newage |
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IS Specification |
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8423 |
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Outlet Size |
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63 mm dia. |
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TAC Approval |
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YES |
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| Branch Pipe |
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Make |
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Newage / Sukan |
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Body |
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Gun Metal |
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IS Specification |
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903 |
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Outlet Size |
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63 mm dia. |
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TAC Approval |
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Yes |
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| Accessories |
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Pressure Gauge |
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Fiebig / H.Guru |
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Pressure Switches |
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Infos / Equiv. |
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Control Panel |
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Bright / Equiv |
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Cables |
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CCI / Incab / Polycab / Universal / Equiv |
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