CLASSIFICATION -REQUIREMENTS - Environmental Conditions - Quality Assurance :

 

Outdoor fire fighting for power transformers

 CLASSIFICATION

 Outdoor fire fighting for power transformers covered by this specification shall be

distinguished by water through a system comprising a pressurized water tank, water filling pump, and arrangements around transformers for water spray.

REQUIREMENTS

 

              Environmental Conditions

             The environmental conditions listed  

Standard Environmental Conditions

 

Clause	Description		Value
1-	Pressure mb-annual mean.		1013
2-	Atmospheric Temperature °C:- Maximum mean daily Minimum mean daily Yearly mean		47* -5 30
3-	Relative humidity % Maximum relative humidity Minimum relative humidity Average relative humidity Daily mean		100 20 75 95
4-	Rainfall mean-annual total (mm)		65
5-	Maximum wind speed (m/sec.) at 10m above ground level.		35
6-	Soil temperature at a depth of 1.5 m.		25°C
7-	Solar energy radiation W/m²		>1100
8-	Wind pressure N/m²		766
9-	Absolute black bulb °C max. recorded		75.7
10-	Thunderstorms		Occasional
11-	Sand storms	Occur occasionally especially in desert.
12-	Pollution	Heavy pollution >50 mS
13-	Seismic load	According to the Egyptian Code and attached map.

 

Note:             This table is valid altitude (0-1000m)

            Maximum temperature shall be in accordance with substation location in Egypt.

          For Cairo Zone

Quality Assurance :

 

  Applicable codes and standards

All  material shall comply with and be manufactured and tested in accordance with the latest editions of:-

-    EUS Electricity Utility specification.

-    Egyptian code for fire fighting standards, law N058.

-    Civil defense law no 48, labor law No 137 and their decrees.

            - NFPA 15: water spray fixed systems for fire protection.

- High-velocity water spray system for transformer, system design, and installation instructions (automatic sprinkler carp of America).

-      BS 5306: part 4 – 1986 “ Total flood method of application”

-        IEEE 979-1999 –a guide for substation fire protection.