|PRODUCT LIST||COOLING SPRAY NOZZLE|
|The AKTEK FIRE Tankcooling nozzle is designed for use on the tank wall of fuel storage tanks. They can be used as cooling nozzles to prevent structural damage to a tank during a fire scenario or they can be used to combat fires in areas such as floating roof storage tanks.
For cooling purposes the media will normally be freshwater or seawater, when being used as fire suppression nozzles a foam solution would be used.
|The ASN-IIB Aktekspray Nozzles are open (non-automatic) directional spray nozzles and they are designed for use in water spray fixed systems for fire protection applications. The ½”
inch NPT Type ASN-IIB Nozzles are external deflector type nozzles that discharge a uniformly filled cone of medium velocity water droplets.
They are especially effective in covering exposed vertical, horizontal,curved, and irregular shaped surfaces in a cooling spray to prevent excessive absorbtion of heat from an external fire and to prevent possible structural damage or spread of fire to the protected equipment. In some applications, depending on water design density requirements, they may also be used for fire control and extinguishment.
The Type ASN-IIB Nozzles are available in a wide variety of orifice sizes and spray angles (included angles of discharge) to provide versatility in system design. Dust Plugs, as described in Technical Data Sheet TDS145, are available for use in applications where protection is required against insect infestation or the accumulation of debris within the nozzles. Rupture Disc Assemblies, as described in Technical Data Sheet TDS146, may be used to retain priming water in ultra high speed, primed water spray deluge systems controlled by a Model F230 Valve or by a Model F231 Valve.
Information on ½” inch NPT Type ASN-IIBS Nozzles with individual strainers and K-factors of 1.1 to 2.8 (15.8 to 40.3) is given in Technical Data Sheet TDS145C.
Referto Technical Data Sheet TDS145B for information on 1 inch NPT Type ASN-IIB Large Capacity Aktekspray Nozzles with
K-factors of 10.7 to 18.1 (154.1 to 260.6) and Technical Data Sheet TDS145A for information on automatic Type ASN-IIB Aktekspray Nozzles.
1. Design data obtained from tests in still air.
2. Design data applies to a residual (flowing) pressure range at the nozzle inlet of 20 to 60 psi (1.4 to 4.1 bar). For pressures up to 175 psi (12.1 bar) consult the Technical Data Department.
Referto the authority having jurisdiction fortheir minimum required residual pressure.
3. The shapes of the Design Spray Profiles remain essentially un-changed over the maximum Axial Distances shown on Pages 3 and 4.
4. For axial distances of 2 feet (0.6 metres) and less and for nozzle
spray angles of 65’ to 140’, the Design Spray Profile is the sameas the nominal spray angle.
5. The maximum Axial Distances shown on Pages 3 and 4 are based on exposure protection
The Type D3 AKTEK Nozzles are rated for use at a maximum service pressure of 175 psi (12.1 bar). They are available in natural finish bronze, chrome plated bronze, electroless nickel plated bronze, lead coated bronze, FEP Teflon? coated bronze,
or natural finish stainless steel. The frame for the bronze assemblies is silicon bronze per ASTM 6584 (C87200) or aluminum bronze per ASTM B148 (C95300), the Deflector is silicon bronze per ASTM B96 (CSSSOO), the Splitter is brass per ASTM B16 (C36000), and the Pin is phosphor bronze. The Frame for the stainless steel as- semblies is stainless steel per ASTM A-296, Grade CF-8M (equivalent to Type 316). The Deflector, Splitter, and Pin are Type 316 stainless steel. Orifice Sizes. Each orifice size has a
numerical designation and the available sizes are as shown in Table A. The nominal discharge curves and K-factors for the various orifice sizes are given in Figure C. Spray Angles. The nominal spray angles (included angles of discharge) are available as shown in Table B. Nozzle Placement. Where direct impingement of water spray onto all of the protected surface is required by the authority having jurisdiction, the nozzles are to be spaced and directed so that their spray patterns will completely cover the plane-of-protection with the minimum required average density; however, it is recommended that indoor nozzle spacings be 12 feet (3.7 metres) or less and that outdoor nozzle spacings be 10 feet (3.0 metres) or less. Where rundown or slip-page is planned, e.g. exposure protection of vessels per NFPA 15, the preceding recommended indoor and outdoor spacings also apply.When used for protecting the surfaces of a vessel, for example, the nozzles are positioned normal to and approximately 2 feet (0.6 metres) from the surface. This approach, in conjunction with a properly selected spray angle, will tend to make more effective use of the spray as well as help minimize the disturbance effects of windldraft conditions on the water spray pattern.Spray Patterns. The Design Spray Profiles for the nozzle spray angles of 65” to 180” are as shown in Figure B and apply to discharge pressures of 20 to 60 psi (1.4 to 4.1 bars). Discharge pressures in excess of 60 psi (4.1 bars) will result in a decrease in coverage area since the spray patterns tend to draw inwards at higher pressures.Refer inquiries on higher discharge pressures to the Technical Data Department.
The maximum axial distances between the nozzle tip and plane-of-protection, for exposure protection, are
given in Tables C and D. When the axial distance from the nozzle tip to the plane-of-protection is 2 feet (0.6 metres) or less, the Design Spray Profile is the same as the nominal spray angle for spray angles of 65’ through 140”.
NOTES Refer to the Warning Section for an important notice concerning the design of individual water spray fixed systems.Znquiries concerning nozzle installation and usage criteria, not covered by these instructions, should be mailed to the attention of the Technical Data Department. Include sketches and technical details, as appropriate.Main Pipeline Strainers. Main pipeline Strainers are required for systems utilizing nozzles with nominal diameters less than 3/8 inch (9.5mm), i.e. No. 16 thru No. 24 orifice sizes (Ref.Table A), and for any system where the water is likely to contain obstructive material.
The Type D3 AKTEK Nozzles must be installed using the Model F799 Offset Sprinkler Wrench shown in Figure D.
Care must be exercised to avoid damage to the nozzles - both before and after installation. Nozzles damaged by dropping, striking, wrench twist/slip page, or the like, must be replaced. Water spray fixed systems for fire pro- tection service require regularly scheduled care and maintenance by trained personnel. It is recommended that the AKTEK Nozzles be periodically inspected for loading/obstructions, or other evidence of impaired protection. The inspections should be scheduled weekly or as frequently as may be necessary and, corrective action taken to ensure that the nozzles will perform as intended in the event of a fire. It is also recommended that outdoor installations of AKTEK Nozzles with Dust Plugs be periodically inspected, during freezing weather conditions, for the presence of ice buildup from trapped condensate which could effect the proper release of the Dust Plugs.
NOTE Before closing a fire protection system main control valve for maintenance work on the fire protection system which it controls, ermission to shut down the affected fire protection system must be obtained from the proper authorities and all personnel who may be affected by this action must be notified. It is recommended that water spray fixed systems for fire protection be inspected by a qualified Inspection Service.
Seller warrants for a period of one year from the date of shipment (warranty period) that the products furnished
hereunder will be free from defects in material and workmanship. For further details on Warranty, see Price List.
Specify: No. (specify number) orifice, Type D3 AKTEK Nozzle in (specify finish/coating and material) with (specify number) degree spray angle, PSN (specify from Table E). Contact your local distributor for availabilty.
Specify: Model F799 Offset Sprinkler
Wrench, PSN 56-452-i -001.