CATALOGUE - FIRE FIGHTING PRODUCTS AND SYSTEMS
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Fire fighting products and systems

Our technical literature is continuously revised and updated and sent to our Customers who are listed in our Catalogues Delivery List. WAIVER OF RESPONSABILITY The information contained herein is provided “as is” and SDM does not guarantee the correctness and accuracy of the same. This publication may contain technical inaccuracies or typographical errors. It may also be subject to periodic changes without prior notice.

SDM is active in the field of fire fighting since 1975, having designed and installed hundreds of systems based on any possible extinguishing technology, be it gas, powder, water or foam. We offer today a complete range of products and systems designed and manufactured at the highest technical level, including nozzles and systems working on the modern concept of watermist extinguishing. These systems, having been widely approved and tested in marine applications, will drive a deep change in the design of land based systems. Our engineering staff, our modern computer systems and software,...

TECHNICAL INFORMATION In the following pages some technical information from our spray engineering handbook. This booklet can be obtained free of charge from any SDM company or SDM distributor.

TECHNICAL INFORMATION international Unit System Description The INTERNATIONAL SYSTEM OF UNITS sometimes called SI, has been defined by the International Standards Organization (ISO) and is based upon metric units. The following notes include most units which are likely to be used in handing of fluids. The system consists of nine base units, and supplementary units which are coherently derived from them. The consistency lies in the fact that the product, or the quotient of any two unit quantities in the system results in another unit quantity. Because of the world wide trend to use this...

TECHNICAL INFORMATION SDM material coding SDM coding system has been organized so that the main characteristic of a single product can be understood from the product code. Within product codes, construction materials are coded in the following way. Multiply American Units on the left (by the conversion factor) to obtain SI Units on the right. Divide SI Units on the right (by the conversion factor) to obtain American Units on the left.

TECHNICAL INFORMATION Conversion table: temperature scales There are 4 principal types of temperature scales used to indicate the temperature: CENTIGRADE CELSIUS, FAHRENHEIT, KELVIN, and RANKINE; Kelvin and Celsius scales are used in Europe, Rankine, Fahrenheit are used in English speaking countries. MP = water freezing point BP = water boiling point

TECHNICAL INFORMATION Metric and decimal equivalents of fractions of an inch mm

foam mixers POSITIVE DISPLACEMENT bladder tanks BALANCED PRESSURE PROPORTIONER WIDE RANGE PROPORTIONER

FOAM MIXERS Positive displacement The precise makeup of water and foaming agent to feed monitors and nozzles in fire fighting systems is of fundamental importance for the efficient performance of the same. In the past this process has been performed mainly through system based onto the Venturi effect, which allows for sinplicity of construction and an acceptable performance, and used both in mobile and fixed systems like bladder tanks and automatic balanced pressure mixing systems. When used in fixed systems the typical problems of the Ventury concept (sensitivity to pressure drops between...

FOAM MIXERS Positive displacement URY Foam mixers built on the principle of a double volumetric pump was first introduced on large uplants like oil refineries or stocking fields, but was afterwards applied to different fields and on smaller plants thanks to the simplicity of use and dependable performances. SDM manufactures a range of hese smaller mixers, with the URY series, whose performances are shown in the table below. These machines are available with two different layouts, offering different performances for the foam agent pickup pump: • Standard system, using a fixed capacity gear...

FOAM MIXERS Positive displacement This is the most modern and precise type of proportioning equipment for large stationary systems, where it is required to maintain a stock of foaming agent available. These machines have been developed to overcome limitations and disadvantages coming from the operation of bladder tanks, that is the following: • Limited operation time, once used the foaming agent in the bladder tank the tank needs refilling • Limited range of precise proportioning, typically lower than 1:5 in capacity range • Costly and complicated maintenance, especially if tank placed...

Data for information purpose only Not valid for construction * Pump size The pump size figure shows both the maximum capacity and the mix percentage, eg: 120.3 = maximum capacity 120 cubic metres per hour (minimum capacity 12 cubic metres per hour) and mix percentage 3%

FOAM MIXERS INDEPENDENT MIXING UNIT

FOAM MIXERS Bladder tanks Bladder tanks work without requiring external energy for a foam agent pump since the foam agent, contained into a rubber bladder inside the tank, is put under pressure letting water under pressure from the main line enter the tank and surround the bladder. A bladder tank can feed several different foam producing devices, all at the same time or just a single one, with a range in water capacity 1:6. SDM offers a very complete range of bladder tanks, built in thousands of units and fully tested in hundreds of sites. Our long experience in the construction of...

FOAM MIXERS Bladder tank functional scheme Single bladder tank Concentrate stop valve Drain valve, mixer Water vent valve Safety valve Vent valve Pressure gauge Foam diaphragm Check valve Pressure gauge, differential Drain valve, water Drain valve, level gauge Twin bladder tank Stop valve Drain valve, concentrate (& filling valve) Cut-off valve, level gauge Level gauge Water diaphragm We can design and quote any size of twin bladder tanks according to customer specification. Please ask our Offices or Distributors