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Dry Pipe Sprinkler System – Working Principle

Gul Bahar Shah
 Dry Pipe Sprinkler System – Working Principle A Dry Pipe Sprinkler System is an automatic fire protection system designed primarily for areas where low or freezing temperatures could cause water-filled sprinkler pipes to freeze and become damaged. It is commonly used in locations such as cold storage areas, unheated spaces, parking areas, warehouses, and other temperature-sensitive environments. How the System Works Under normal conditions, the sprinkler piping is not filled with water . Instead, the pipes are maintained with pressurized air or nitrogen . Water is held on the supply side of a dry pipe valve , which prevents water from entering the sprinkler piping until the system is activated. When a fire occurs, the heat generated by the fire causes the nearest sprinkler head to reach its operating temperature. The sprinkler head then opens, releasing the pressurized air or nitrogen from the piping. As the compressed air pressure decreases, the pressure difference across t...
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AHU TYPES

Gul Bahar Shah

 AHU (Air Handling Unit): Mixes fresh and return air to cool, filter, and circulate air in a building.

FAHU (Fresh Air Handling Unit): Supplies 100% fresh outdoor air; no return air.
OAHU (Outside Air Handling Unit): Handles 100% outside air, usually for large capacities.
MAHU (Make-Up Air Handling Unit): Replaces exhausted air and maintains pressure balance.
PAHU (Pre-Conditioned Air Handling Unit): Pre-cools or pre-heats fresh air before it enters AHU/FCU.
DX AHU (Direct Expansion AHU): Uses refrigerant coils; no chiller required.
Hygienic AHU: Designed for clean areas with HEPA filtration and hygienic construction.
Heat Recovery AHU: Recovers energy from exhaust air to reduce power consumption.

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