Dear All ,
Am Wondering If there's any requirement to install the Aspirating system for hanger with dropped beams ?
How should we install the pipe network at the dropped beams ?
Thank You in Advance .
Aspirating system for hanger could be considered in align with points below.
a. High airflow diluting smoke in hanger arena
b. Large and open space (area to be checked)
c. Dropped beams and other open spaces, where the air flow movement is slow.
Sampling pipe on dropped beam to be installed with the allied support to have the same in a considerable distance.
Or you could install the same from the ceiling to hang the sampling pipe at the required distance.
Sampling hole distribution (number of hole) and the length of pipe from aspirating detector could be traced from the calculation on it.
Foam suppression system shall not be in voting logic in align with confirm fire, from aspiration system.
Thank You Mr. Sourabh, For Your Kind Reply .
I've another question about the Aspirating system .
I'm wondering if there's any limitation for using the Aspirating system with Dry Sprinkler System or in the Deep freeze stores Places , According to The NFPA requirements ?
Thank you .
Ordinary fire detection equipment is generally not suitable for the cold environment found in cold storages and frozen storages. The use of aspirating smoke detection systems is considered the most appropriate for these conditions. In which case a central detection unit, located outside the cold storage, draws air through a network of pipes inside the storage compartment to sample air and detect smoke particles.
Implementing sprinkler systems in cold storages is a challenging task in terms of design and construction and in terms of operation, maintenance and testing of the systems. As these types of rooms or buildings are generally large, the use of carbon dioxide or foam systems are not considered suitable. Generally a combined dry pipe and pre-action systems need to be used.
Considerations are needed to prevent ice plugs and the location and temperature rating of sensors needs to ensure sprinkler response close to that of a wet pipe system. Design calculations on this, for certain categories of frozen storages, sprinkler systems are not necessary to ensure an acceptable level of safety. However, this depends highly on the storage size, configuration and type of materials being stored.
The fire load in cold storages can be very significant when considering the entire quantity of combustible materials within the compartment.
As per NFPA - 13, 2019 (A.8.3.1),
To help avoid ice formation in piping due to accidental tripping of dry pipe valves in cold storage rooms, a deluge automatic water control valve can be used
on the supply side of the dry pipe valve. Where this method is employed, the following also apply:
(1) Dry systems can be manifolded to a deluge valve, with the protected area not exceeding 40,000 ft2 (3720 m2). (2) Where a dry system is manifolded to a deluge valve, the distance between valves should be as short as possible to minimize water hammer. (3) The dry pipe valves should be pressurized to 50 psi (3.4 bar) to reduce the possibility of dry pipe valve operation from water hammer.
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