Description
APPLICATION
Foam Maker is used for one of the most common applications of protecting tank seal in vertical liquid storage tank with internal floating roof with low expansion foam system. The application of aspirated foam is on the basis of the risk comprising the area in the annular ring between the rim of the floating roof and the tank shell. The Foam system design guidelines generally used are in accordance with NFPA11 standard. The Foam Makers are defined by NFPA 11 as Type II discharge outlets for delivering the low expansion aspirated foam to the seal. The Foam Makers are widely used with the Inline Foam Inductor, Balance Pressure Foam Proportioning system, Bladder Tank system and Foam tenders. SPECIFICATION Foam Maker is an air aspirating foam generator connected to the foam pourer to deliver the aspirated
foam gently into the tank seal area. Foam maker covers wide range of foam solution rates from 75 to 557 litres per minute at 2.8 to 7 kg/sq.cm inlet pressure. The orifice is field replaceable in the event of change in design parameters. The foam is produced by introducing air into the foam solution stream. The inlet of foam maker is designed to create venturi jet which draws air into the foam solution stream.
The air is drawn into the foam solution through holes located on the foam maker covered with stainless steel screen to exclude nesting birds and insects. The aerated foam is directed into the pourer for the gentle application of the expanded foam. The pourers
are available in different models.* *Refer to UL/FM directory for specific foam concentrate along with working pressure and flow details.
INSTALLATION, TESTING AND
MAINTENANCE
Carefully unpack Foam Maker While unpacking and installation, it is to be handled with care and shocks to be avoided. Check visually for any damages. While installing, ensure that the Foam Maker is not under stress due to any misalignments in installation or variations of system piping. Ensure that the strainer assembly is clear from any blockages or damages. if strainer assembly is either blocked or damaged will adversely affect the performance of the equipment. Qualified and trained person must commission the system. After few initial successful tests, an authorized person must be trained to perform inspection and testing of the system. It is recommended to carry out physical inspection of the system regularly. The system must be fully tested at least once in a year or in accordance to standards of the organization having local jurisdiction. Do not turn off the system or any valve to make repair or test the system, without placing a roving
Fire Patrol in the area covered by the system. The Patrol should continue until the system is put back in service. Also inform the local security guard and control alarm station, so as to avoid false alarm.
JULY, 2022 PAGE 2 OF 6 HD 255
HD FIRE PROTECT
PVT. LTD.
Each system is to be flushed properly. To test the Foam Maker without discharging the foam into the tank seal area, the foam maker is to be rotated 180o away from the wind shield. The air screen is to be inspected periodically for obstruction of air inlet
holes. If any obstruction is noticed, remove the same and flush if necessary. The foam maker outlet and pourer, if exposed to atmospheric condition, should be periodically inspected for nest and other obstructions. Any obstruction if noticed must be removed and
flushed to clear the discharge path. NOTE:
1. A PROVISION IS TO BE MADE FOR PRESSURE GAUGE MOUNTING AT INLET OF FOAM MAKER, WHICH MAY BE PLUGGED AFTER SUCCESSFUL COMMISSIONING OF THE SYSTEM. THIS WILL HELP TO ANALYSE THE SYSTEM WHILE COMMISSIONING. 2. THE OWNER IS RESPONSIBLE FOR THE TESTING, INSPECTION AND MAINTENANCE OF THE FOAM MAKER AND THE SYSTEM. 3. FM APPROVAL AND UL LISTING OF EQUIPMENT ARE VALID ONLY WHEN USED WITH HD FOAM CONCENTRATE IN A MANNER AS PER FM/UL APPROVAL DATA.
4. FM APPROVAL IS VALID ONLY WHEN TOTAL SYSTEM IS HAVING FM APPROVED PRODUCTS. 5. REFER TO THE INDIVIDUAL FOAM UL LISTING & FM APPROVAL FOR OPERATING AND LIMITATION WITH EACH FOAM CONCENTRATE AND FOAM MAKER.
Selection of HD Foam Maker:
FOAM CONCENTRATE AFFF 3% AFFF 3% AR-AFFF 3X3% *APPROVALS UL LISTED FM APPROVED WORKING PRESSURE 2.8 to 7 kg/sq.cm 2.8 to 7 kg/sq.cm 5.2 to 7 kg/sq.cm K-FACTOR 44.8 to 126.6 56.8 to 132.3 99.5 to 138.0 FOAM CONCENTRATE AFFF 3% AFFF 3% AR-AFFF 3X3%
*APPROVALS UL LISTED FM APPROVED WORKING PRESSURE 2.8 to 7 kg/sq.cm 4.9 to 7 kg/sq.cm 3.5 to 7 kg/sq.cm K-FACTOR 89.6 to 207.8 158 to 210.5 82.9 to 211.7 TABLE I – Selection of 50 NB HD Foam Maker TABLE II – Selection of 65 NB HD Foam Maker * Refer to UL/FM directory for specific foam concentrate, working pressure and flow. Example: To find K factor: Q = 150 lpm P = 3.5 kg/sq.cm K = 150 ÷ √3.5 = 80.17 The K-Factor 80.17 falls within the range of the Foam Maker having 50NB size. Hence 50NB size Foam Maker to be selected.
The Foam Maker can also be selected by using graph
