EP2468391B1 - Device for determining the mix rate of an injector in an extinguishing pipeline - Google Patents

Description

The invention relates to a device for determining the Zumischrate a membrane tank Zumischers according to the features of the preamble of the first claim.

The invention is suitable for determining the admixing rate of the foaming agent in an extinguishing system by means of Zumischers, without causing an environmentally harmful water-foam mixture is formed and disposed of and without that a replacement liquid must be used.

The foaming agent as storage medium in a membrane tank is a water-polluting liquid, which also contains substances that are difficult to decompose. When commissioning and testing a Zumischers for a foaming agent from a membrane tank in an extinguishing line, the foam-water mixture must be collected, disposed of and the special waste disposal, because the foam-water mixture is often classified as a water-polluting liquid and contains hardly degradable substances. With the available Zumischern it is structurally not possible to separate the foaming agent during the admixing process and collect as a pure concentrate to return it into the Schaummittelbehälter. Membrantankzumischer be at a flow rate of 500 l / mm to VdS CEA 4001 (Part M) or at minimum and maximum flow value with production of foam-water mixture according to EN 13565-2 (11.3.2.4.2.) For determining the rate of addition tested. The capture of the foam-water mixture at high flow rates is very difficult, since it comes to the introduction into a collecting container to considerable foaming. Furthermore, large amounts of foam-water mixture must be disposed of. So far, the admixing rate could only be determined by means of the collected foam-water mixture and mixing of another three reference solutions via conductivity meters or refractometers. In addition, the result of this method is influenced by a number of influencing factors, so that inaccurate measured values can occur. Zumischvorrichtungen according to the preamble of claim 1 are made DE 3134911 and DE 3003 591 known.

It is therefore an object of the invention to develop a device with which it is possible to determine the Zumischrate Zumischers an extinguishing pipe as accurately and reliably as possible and set without an environmentally polluting water-foam mixture is created and disposed of.

This object is achieved by a device according to the features of the first claim.

Subclaims give advantageous embodiments of the inventors again.

The inventive device for determining the Zumischrate between the foam concentrate and the water of a Zumischers in an extinguishing line provides that in the simplest way to implement the invention between the extinguishing pipe and the Zumischer a line is arranged, in which a foaming agent equivalent valve is located and a Device for flow measurement. The line between the extinguishing line and the admixer is referred to below as the bypass line. In it, a shut-off valve may be present to separate them from the extinguishing pipe. As a flow meter, a flow meter known to those skilled in the art is used.

It is advantageous to arrange the bypass line between the line, which directs the water in the membrane tank and leads to the line that leaves the membrane tank with a foam concentrate again. It is advantageous to arrange 3/2-way shut-off valves before and after the membrane tank.

The membrane tank is a conventional membrane tank, which has a membrane between water and foam concentrate and into which protrudes a riser through which the foam concentrate leaves the membrane tank.

The foaming agent equivalent valve in the bypass line is advantageously a throttle valve on which an adjustment display is arranged.

When commissioning and testing the rate of addition, the extinguishing water does not flow into the membrane container, but through the test bypass line, There is no foaming agent added, instead, the admixer mixes the water to the bypass line. Due to the different density and viscosity would be measured at the flow of water through the test bypass line, a different flow rate than when operating the admixing with foam concentrate in case of fire. These deviations of the measurement result are compensated by appropriate regulation of the foaming agent equivalent valve. There is a greater pressure drop in the water operation is generated to produce the flow of water, which would adjust with foaming agent.

The foaming agent equivalent valve is calibrated in the course of product development by calculating the actual pressure losses with foaming agent or by means of comparative measurements in tests with foam medium flow on the different foaming agent types of similar viscosity. In this case, the flow through the admix must be included, as in the control unit of the Zumischers by design has significant pressure losses and a disregarding excessive distortion of the determined Zumischrate would result. The foaming agent equivalent valve has markings with which the equivalent pressure loss for water of different types of foaming agent can be adjusted.

For the test of Zumischrate the 3/2-way shut-off valves are set in the direction of the bypass line, the Schaummitteiäquivalentventil set to the foaming agent used, the extinguishing system is put into test mode and the flow rate is read on the meter. This value can be used to calculate the proportioning rate using a known formula.

Furthermore, it is advantageous to arrange emptying devices on the device according to the invention. These are shut-off valves, under which there is a drain. Furthermore, it is advantageous to arrange the pressure fittings in the lines of the system.

By the invention, the otherwise necessary disposal of water polluting and polluting foam-water mixture is avoided. So far, each test produced 1,000 to 2,000 liters of foam-water mixture. The previous method is extremely cumbersome and risky, especially with regard to the collection of foam-water mixture with a flow rate of at least 500 l / min.
In the past, could be caused by very strong foaming environmental damage by the fact that foam overflows uncontrollably. This risk is eliminated by the use of the present device.

The determination of the admixing rate is to be carried out by many influential factors and sources of error only by experienced, experienced persons. With the invention, the determination of the Zumischrate is easier, more accurate and safer to carry out.

In the following the invention will be explained in more detail with reference to an embodiment and a figure. The figure shows the device according to the invention with a flowmeter.

The FIG. 1 shows the admixer 1 in the discharge line 3, in which water 4 flows to the admixer 1. The line 16 leads to the membrane tank 12, from which a further line 14 leads to the admixer 1. The water 4, which via the line 16 to the membrane tank 12th passes is stopped by the membrane 6, which separates the water 4 from the foam concentrate 5. During operation of the admixing device, the water-foam concentrate can be supplied to the admixer 1 via the line 14. Between the extinguishing line 3 and the admixer 1, the bypass line 2 is arranged with the foam equivalent valve 8 and the flow meter 9, wherein at two shut-off valves, which represent 3/2-way shut-off valves, the bypass line 2 before and after the membrane tank 12 with the lines 16, 14 connects to the extinguishing line 3 and the mixer 1.

At appropriate locations of the device emptying devices 13 are arranged.

List of reference numbers used

1

Inductor

2

bypass line

3

erase line

4

water

5

foam concentrate

6

membrane

7

riser

8th

Foam equivalent valve

9

flowmeter

10

3/2-way shut-off valve

11

manometer

12

membrane tank

13

emptying

14

Lead between 12 and 1

15

fitting

16

Lead between 12 and 3

Claims (6)

1. A device for determining the admixture rate of a proportioner (1) in an extinguishing pipe (3) from a bladder tank (12) with a membrane (6) between the concentrated foam agent (5) and the water (4), characterized by a bypass pipe (2) between the extinguishing pipe (3) and the proportioner (1), wherein a foaming agent equivalent valve (8) and a device for measuring the flow rate is disposed in the bypass pipe (2).
2. The device according to claim 1, characterized in that the bypass pipe (2) with the foaming agent equivalent valve (8) and the flow meter is disposed between two valves upstream and downstream of the bladder tank (12).
3. The device according to claim 2, characterized in that the valves are 3/2-way valves (10).
4. The device according to one of the claims 1 to 3, characterized in that a valve (15) for closing the pipe (16) is disposed between the extinguishing pipe (3) and the bypass pipe (2).
5. The device according to one of the claims 1 to 4, characterized in that the device for measuring the flow rate is a flow meter (9).
6. The device according to one of the claims 1 to 5, characterized in that the foaming agent equivalent valve (8) is a choke valve with an adjustment display.

Images