Storz


Storz is a type of hose coupling invented by Carl August Guido Storz in 1882 and patented in Switzerland in 1890, and patented in the U.S. in 1893 that connects using interlocking hooks and flanges. It was first specified in standard FEN 301-316, and has been used by German fire brigades since 1933. Amongst other uses, it has been widely employed on fire hoses in firefighting applications. It is the standard coupling on fire hoses in Portugal, Denmark, Germany, Austria, Switzerland, Sweden, the Netherlands, Israel, and Greece. It is also widely used in Australia and the United States.
The Storz coupling system is also widely used for filling of bulk wood pellet storage systems in Europe, although in France and Belgium the equivalent Guillemin coupling is more commonly employed.
Storz connectors are usually made of brass or aluminium. They can be manufactured by casting for general hose connection and low pressure applications, but for firefighting, it is better to use forgings to guarantee the safety and durability of the coupling.
It is sometimes referred to as a sexless coupling, because rather than having a male and a female end connected by screw threads, either identical end can be joined to any other end of the same diameter. This is also called hermaphroditic or two-way connection. To couple a Storz connection, the two opposing couplings are pressed together such that the hooks of each one are inserted into the slots in the flange of the other. Then they are rotated in opposite directions until they are tight, or latches engage. This creates a watertight connection between the internal packing gaskets. To uncouple them, the latches are released and the connectors are turned in the opposite directions from coupling, and then separated when the hooks and slots are aligned. Special wrenches are designed for assisting with use of Storz connectors.
The main benefit to using Storz couplings is speed of hose connection, as a hose can be locked with a quarter-turn. By comparison, locking hoses using threaded couplings often takes several turns. Because of this, Storz couplings are widely viewed as a safer alternative to using threaded couplings. A secondary benefit over threaded couplings is that the connecting faces and hooks are less prone to damage if the coupling is dropped onto, or dragged over, a hard surface.
Storz couplers are available commercially in the following non-DIN-specified sizes:
Storz
size
Lug diameter,
inner face
Hose diameter,
internal
Fire-fighting
usage
253725Australia
324432
385238Australia
455945
658138, 42, 52, 64, 70Australia
758965, 75
9010590
100115101 U.S.
125148125 U.S.
135159135
150 3-lug160150
165188165
205 2-lug220203
205 3-lug220203
250 3-lug278256

DIN standards define the following pressure couplings:
Storz
size
Seal diameter,
inner
Lug diameter,
inner face
DIN
standard
Hose diameter,
internal
Fire-fighting
usage
D25311430125Germany
S28526614330-228Germany
S32526614330-132Germany
C4252661433242Germany
C5252661430252Germany
B75891430375Germany
A11013314300110

DIN standards define the following suction couplings:
Storz
size
Seal diameter,
inner
Lug diameter,
inner face
DIN
standard
Hose diameter,
internal
Fire-fighting
usage
D25311430115, 19, 25
C52661432119, 25, 32, 38, 42, 45, 52, 64
B75891432252, 65, 70, 75
A11013314323102, 110

DIN standards define the following fixed couplings :
Storz
size
Seal diameter,
inner
Lug diameter,
inner face
Sealing methodDIN
standard
Fire-fighting
usage
D2531Rubber gasket14306
C5266Rubber gasket14307
C5266Integral metal seat14317
B7589Rubber seal14308
B7589Integral metal seat14318
A110133Rubber gasket14309
A110133Integral metal seat14319

DIN standards define the following threaded adapters:
Storz
size
Seal diameter,
inner
Lug diameter,
inner face
ThreadDIN
standard
D2531BSP 1″14306
C5266BSP 2″14307
B7589BSP ″14308
A110133BSP ″14309

DIN standards define the following caps:
Storz
size
Seal diameter,
inner
Lug diameter,
inner face
DIN
standard
D253114310
C526614311
B758914312
A11013314313

DIN standards define the following swivel reducers:

United States usage

Guido Storz patented his coupling in Switzerland in 1890, and it soon became a standard for fire hydrants throughout much of Europe — but it took nearly one hundred years before the main larger "steamer ports" on fire hydrants started to be converted to the Storz coupling in the United States. U.S. fire engines typically carry LDH with Storz couplings on both ends for connections between fire hydrants and pumps. However, if a hydrant usually has threaded couplings, an adapter is required to use with Storz. All major U.S. hydrant manufacturers now offer Storz couplings as original equipment on their hydrants, to connect with the Storz couplings used by firefighters. Hydrants may also be retro-fitted from thread to Storz to aid interoperability between firefighting organizations.
The 100 mm and 125 mm Storz couplers have been specified in NFPA 1963, Standard for Fire Hose Connections, since the 1993 edition.
U.S. cities that have fire hydrants with 125 mm Storz connectors include Raleigh, NC and the City of Corvallis, OR.