Multipurpose nozzle

C multi-purpose nozzle

Multipurpose nozzles are special fittings used by the fire brigade to deliver extinguishing agents (water or water / foam mixtures), which are used in addition to special nozzles , foam nozzles and hollow nozzles . They are available in sizes B, C and D , depending on the respective pressure hose to which they can be coupled.

While the forerunners, the round spray nozzles , only allowed the choice between full jet and "stop water", the multi-purpose nozzles with the additional spray jet function allow a further choice.

Multi-purpose nozzles are standardized in the versions BM, CM, CMM and DM. The first M in the name stands for multi-purpose jet pipe , the second for man protection shower which can protect fire fighters from direct exposure to flames. They belong to the group of water-bearing fittings for water delivery.

The further development is the hollow jet pipe .

General

Nozzles in the Stuttgart Fire Brigade Museum

The type of jet is determined by the direction in which the swirl body is introduced by the ball valve in the direction of flow of the water. The guide surfaces of the swirl body either act as a rectifier and thus lead to the full jet or - if the swirl body is rotated by 180 ° - as a swirl generator that enables the spray jet. If the swirl body is only rotated by 90 °, the swirl body blocks the water flow; the nozzle is on "stop water".

The amount of water that is dispensed can be changed using a screw-on mouthpiece, but the dispensing of water must be interrupted.

Due to the greater flexibility and the better spray pattern, in recent years, especially for fire fighting in buildings, hollow nozzles have increasingly been used in place of C multi-purpose nozzles.

Since there is such a strong recoil with B-jet pipes that they cannot be held on their own, they are usually used together with a support elbow , which transfers approx. 30% of the force to the ground via the pressure hose. With a support elbow, two firefighters are enough to hold the B-jet pipe. If there is no support bend or if the stand is unsafe, three firefighters have to hold the B-pipe.

Executions

Type	Nozzle diameter [mm]		Volume flow according to DIN [l / min]		Rule of thumb at 5 bar [l / min]
Type	with mouthpiece	without mouthpiece	with mouthpiece	without mouthpiece	with mouthpiece	without mouthpiece
BM	16	22nd	335-395	565-775	400	800
CM	09	12	105-125	170-230	100	200
DM	04th	06th	018 - 028	040 - 065	025th	050

In 2007 DIN 14365 was replaced by DIN EN 15182 Part 1–4. In DIN EN 15182-3, multi-purpose nozzles with full jet and / or a constant spray angle PN 16 are described, which correspond to the multi-purpose nozzles according to the old DIN.

history

In the early days , the jet pipes did not have their own shut-off device. The water delivery therefore had to be regulated via the pump or at the distributor . Strictly speaking, they weren't "multi-purpose nozzles", just "nozzles".

This form of the jet pipe is also called "DK jet pipe" or "mandrel". The “mandrel” as a jet pipe shape still finds its place on the hose of the bucket syringe .

literature

Lutz Rieck: Die Rote Hefte, booklet 06 - fire extinguishing fittings . Kohlhammer, Stuttgart 2000, ISBN 978-3-17-015171-0 , pp. 82-85 .
Lothar Schott, Manfred Ritter: Fire Brigade Basic Course FwDV 2 . 20th edition. Wenzel-Verlag, Marburg 2018, ISBN 978-3-88293-220-1 .
Walter Hamilton (founder): Handbook for the fire service. 21st edition. Boorberg, Stuttgart et al. 2012, ISBN 978-3-415-04560-6 .

Individual evidence

↑ ^a ^b DIN 14365, 2007 replaced by DIN EN 15182-3
^ Karl Ebert: Handbook of fire brigade fittings. Max Widenmann KG .
↑ Employees of the state fire brigade school Baden-Württemberg: training of volunteer fire brigades. Basic training. Course material sheets for training in accordance with section 4.1 of the fire service regulations 2/1 and 2/2 and the catalog of learning objectives for the Baden-Württemberg volunteer fire service. 4th edition, as of January 1995. Neckar-Verlag, Villingen-Schwenningen 1995.
↑ [1] Basic activities - fire extinguishing and assistance (with editorial additions until 03/2007) 10 MB, Federal Office for Civil Protection and Disaster Aid , 2007.
↑ ^a ^b HAMILTON: Handbook for the fire brigade (= operational practice ). 17. Edit again Edition, 1992, ISBN 3-415-01705-2 .
↑ Holger de Vries: Fire fighting with water and foam. Technique and tactics (= practical application ). 3rd, completely revised and expanded edition. ecomed Sicherheit, Landsberg 2008, ISBN 978-3-609-68742-1 .

[DIN-1] DIN 14365, 2007 replaced by DIN EN 15182-3

[AWG-2] Karl Ebert: Handbook of fire brigade fittings. Max Widenmann KG .

[3] Employees of the state fire brigade school Baden-Württemberg: training of volunteer fire brigades. Basic training. Course material sheets for training in accordance with section 4.1 of the fire service regulations 2/1 and 2/2 and the catalog of learning objectives for the Baden-Württemberg volunteer fire service. 4th edition, as of January 1995. Neckar-Verlag, Villingen-Schwenningen 1995.

[FwDV_1-4] [1] Basic activities - fire extinguishing and assistance (with editorial additions until 03/2007) 10 MB, Federal Office for Civil Protection and Disaster Aid , 2007.

[Hamilton-5] HAMILTON: Handbook for the fire brigade (= operational practice ). 17. Edit again Edition, 1992, ISBN 3-415-01705-2 .

[6] Holger de Vries: Fire fighting with water and foam. Technique and tactics (= practical application ). 3rd, completely revised and expanded edition. ecomed Sicherheit, Landsberg 2008, ISBN 978-3-609-68742-1 .