8/2/2019 Fire Water Network Document

1/2

Important points of Fire water Network Drg

Criteria for above / underground network1. The fire water network piping should normally be laid above ground at a height of 300 to 400 mm

above finished ground level. However, the fire water network piping shall be laid below groundlevel at the following places.

i) Road crossingsii) Places where the above ground piping is likely to cause obstruction to operation and vehiclemovement, and get damaged mechanically.

Protection for underground pipelinesThe main shall have at least one meter earth cushion in open ground and 1.5 mtrs earth cushion underthe roads. In case of crane movement areas, pipes may be protected with concrete/steel encasement.ii) The mains shall be provided with protection against soil corrosion by suitable coating/wrapping.iii) In case of poor soil conditions it is recommended that concrete/ masonary supports be provided underthe pipe.

Protection for above ground pipelines1. The fire water mains shall be laid on independent sleepers by the side of road. These shall not be

laid along with process piping on common sleepers.2. The mains shall be supported at regular intervals not exceeding 6 mtrs.

Layouti) Fire water mains shall not pass through buildings or dyked areas.ii) Hydrants / monitors shall not be located inside the dyke area.

Fire hydrantsThe maximum distance between two hydrants, however, shall not exceed 30 mtrs around hydrocarbonstorage and hazardous areas and 45 mtrs in other areas. Each hydrant shall have two outlets inclinedtowards the ground. The outlets shall be of female instantaneous type having a standard size of 63.5 mmconforming to Indian Standards.Hydrants

1. At least one hydrant post shall be provided for every 30 mtrs of external wall measurement orperimeter of unit battery limit in case of high hazard areas. Hydrants protecting utilities andmiscellaneous buildings in high hazard areas may be spaced at 45 mtrs intervals.

2. The hydrants shall be located at a minimum distance of 15 mtrs from the periphery of storagetank or hazardous equipment under protection. For process plants location of hydrants shall bedecided based on coverage of all areas. In the case of buildings, this distance shall not be lessthan 5 mtrs and more than 15 mtrs from the face of building. Provision of hydrants withinbuildings shall be in accordance with Standard IS Standard 3844. Hydrants/Monitors shall belocated along road side berms for easy accessibility.

3. Double headed hydrants with two separate landing valves on 4" stand post shall be used. Allhydrant outlets shall be situated at a workable height of about 1.2 mtrs above ground level.

4. Hydrants / Monitors shall be preferably located with branch connections and not directly overmain header for easy accessibility.

Monitors1. The monitors should not be installed less than 15 mtrs from hazardous equipment.2. The location of water monitors shall not exceed 45 mtrs. from the hazard to be protected.

Hydrants and monitors shall not be installed inside the dyked areas.

MATERIAL SPECIFICATIONS1. Pipes: Carbon Steel as per IS: 3589/ IS:1239 or its equivalent.

8/2/2019 Fire Water Network Document

2/2

2. The use of Cl pipes is not recommended for fire water service within installations. Use of CastSteel valves is preferable in offsite areas also. However, it may be decided on economicconsiderations for each case. Isolation valves having open/close indication shall be Gatevalves, however, for 12" & above sizes, Butterfly valves should be used.

3. Hydrant: Stand post: Carbon Steel Outlet valves/ .. Gunmetal / Aluminium / landing valvesStainless Steel / AIZn

4. Monitors : Carbon Steel/ Gun Metal5. Fire Hose IS 636: Reinforced rubber lined of Type A or Synthetic hose of Type B6. In case of underground mains the isolation valves shall be located in RCC/brick masonry

chamber.7. The above ground fire water mains and the fire hydrant stand post shall be painted with

corrosion resistant "Fire Red" paint