GB/T 30040.4-2013Leak detection systems - Part 4: Liquid and/or vapour sensor systems for use in leakage containments or interstitial spaces (English PDF)

4.1

General technical requirements in accordance with GB/T 30040.1.

4.2

Test temperature for work at low temperatures is given in brackets [] within.

4.3

liquid or vapor sensor is installed, it should be able to detect the presence in the facility or into the anti-leakage or double the gap a specific liquid

Or volatiles.

4.4

leak-proof facility has the following form.

--- Spill sump or tank for collecting the double pipe or pump leakage overflow;

--- Seepage pond for collecting leaking tank or other liquid storage facilities;

--- Other facilities can be installed sensors detect liquids or vapors facilities.

5.1

General requirements see GB/T 30040.7.

5.2

liquid detection, double space should be designed to allow a minimum of 10L particular liquid into or stored therein.

5.3

Double gap should guarantee its lowest point sensors can be installed.

5.4

double-gap structure should allow leakage of liquid flow to its lowest point.

5.5

Design tank leak detection system should ensure security at the level of the reservoir, the inner double gap in the tank is not connected.

5.6

Design of pipeline leak detection system should ensure double inner space of the inner tube is not connected.

5.7

Double gap should be able to seal performance test.

6.1

anti-leakage facilities designed to detect leakage of liquid, which should be designed to allow a minimum of 10L into the reservoir or stored therein.

6.2

system, the number of sensors and the number should be the same as the low leak-proof facilities.

NOTE. Design leak-proof facilities should ensure that any leakage of the liquid can be leak-proof facilities in a number of lows collected.

6.3

leakage prevention facilities should be capable of having liquid tightness barrier liquid, water or other substances may be exposed to all, while the maximum capacity

The following liquid level no outlet.

6.4

If you can not put an end to anti-leakage of water into the facility, it should take appropriate technical measures to avoid damage to the performance of the leak.

6.5

can not cut through the wall leakage prevention facilities, or they may produce liquid penetration, affect its function.

6.6

can prevent leakage leak test facility.

6.7

If leakage prevention facilities as a single layer of the tank leak protection facility, the facility should be impermeable for the whole of the surrounding structure and having a store

The ability of liquids.

7.1

liquid sensor can detect its normal exposure to certain liquids (e.g., liquid, water).

7.2

liquid sensor should meet the test requirements of Chapter 10 or Chapter 11.

8.1

vapor sensor for detecting volatile gases generated in the reservoir.

8.2

vapor sensors shall comply with the testing requirements of Chapter 12.

9.1

should install leakage display device.

9.2

When detecting the presence of the reservoir or water, leakage display device should raise the alarm.

Type test liquid sensor 10

10.1 Test Purposes

10.1.1

When the liquid entering the double gaps or leakage prevention facilities (drying the space under normal circumstances), the response of the sensor system. test

Experience should be demonstrated.

a) when the liquid level rises at a given rate, the sensor system indicates the presence of a liquid reaction times;

b) when the condition indicates the presence of the liquid, remove the liquid recovery time, the sensor system required.

10.1.2

The sensor system shall be applied to the detection of liquid requirements. As far as possible be tested separately by these liquids, if the test may

When significant risk of accidents, can be used with similar chemical and physical properties of the liquid and less harmful alternative tests done, for example,

Replace gasoline naphtha.

10.2 Assessment

10.2.1

if the following conditions are met, the test is considered by.

a) no test liquid does not indicate the presence of the test liquid is present;

b) After the test fluid at a rate of 10L/h for the first time into the test system within 30min start instruction;

c) After the test fluid at a rate of 50L/h for the first time into the test system, within 6min start instruction;

d) After the test liquid is removed, the recovery time of the sensor measurement does not exceed 20h.

10.2.2

In 10.4 specified test environment condition shall meet the above requirements.

10.2.3

Sensor recovery and reset the alarm before the alarm system should remain state.

10.3 test device

Test device consists of the following components.

a) Test for vertical cylindrical vessel is flat, horizontal cross-sectional area (0.1 ± 0.002) m2 (ie 0.01m deep volume of liquid

Equal 1L), the minimum depth of 0.6m. In the bottom of the container should be set up one or more containers flush with the surface of the liquid to facilitate

Into the apparatus. Also install a similar device with a flow rate of above 5L/min of drain cock.

b) used to identify the various appropriate amount of liquid (or a suitable test fluid).

c) metering pump (minimum liquid reserves 6L), at a specific rate for liquid fed to the test specified in 10.2 container, fine

Of 2%.

d) climate chamber, the temperature can range from -25 °C ~ 70 °C adjustment precision 2K.

e) Test the temperature at -40 °C ~ 40 °C, the climate chamber temperature can be varied within the range of -50 °C ~ 40 °C, the precision

2K.

f) timer, time is displayed in units of 1s, the minimum total range of 24h, precision 2s.

10.4 Test Method

10.4.1 prepare

10.4.1.1

Test sensor should be installed at the bottom of the container to ensure proper contact with the test, but not touching the liquid out of the hole location. As far as possible

Use accessory manufacturer. Accumulator means test vessel and metering pump should be installed in the climate chamber. Sensor indicating means tested

Outer box should be installed in climate, environmental conditions in the laboratory.

10.4.1.2

during sensor system is applicable to a variety of liquids before the test, injecting a suitable liquid reservoir device or metering pump

Test liquid.

10.4.2 Stabilization

Before the start of the test, the sensor system is adjusted to a fully operational state, while the climate chamber preset temperature required for the test

Degrees, and to achieve the required test temperature ± 2K 30min after holding at an internal temperature.

10.4.3 Program

Each test should follow the procedure below.

a) Check the leakage indicator, if the display has a liquid is present, the test is terminated;

b) the metering pump set to a predetermined conveying speed;

c) the stopwatch is cleared;

a) approved liquid (after sensor test);

b) the reaction time (for each test performed by the approved liquid, select the longest time);

c) recovery time (for each test performed by the approved liquid, select the longest time).

10.6.2

or labeled described with reference to the same information on the sensor.

Type test fluid identification sensor 11

11.1 for liquid identification sensor scale storage reservoir and water

11.1.1 Test Purposes

11.1.1.1

proof within the monitoring area of the sensor system detects the presence of liquid water and the applicability of. The test shall be proved.

a) when the liquid level rises at a given rate, the sensor system indicates the presence of a liquid reaction time required;

b) when the condition indicates the presence of the liquid, remove the liquid recovery time, the sensor system required.

11.1.1.2

sensor system should be applied to the detection of liquid requirements. As far as possible be tested separately by these liquids, if the test may

When significant risk of accidents, can be used with similar chemical and physical properties of the liquid do less harmful alternative tests, for example, the

Replace gasoline naphtha.

11.1.2 Assessment

11.1.2.1

if the following conditions are met, the test is considered by.

a) no test liquid does not indicate the presence of the test liquid is present;

30min after the time b) to varying degrees, the sensor immersed in water, the test liquid at a rate of 10L/h for the first time into the test system transmit signal;

The hair after 6min c) When the sensor is immersed in water to varying degrees, the test fluid at a rate of 50L/h for the first time into the test system

Signal;

d) After the test liquid is removed, the sensor allows for maximum recovery time of 20h.

11.1.2.3

sensor alarm reset and restore the former system remains the alarm status.

11.1.3 Test apparatus

Test device shall be of the following components.

a) Test for vertical cylindrical vessel is flat, horizontal cross-sectional area (0.1 ± 0.002) m2 (ie 0.01m deep volume of liquid

Equal 1L), the minimum depth of 0.6m. In the bottom of the container should be set up one or more containers flush with the surface of the liquid to facilitate

Into the apparatus. Install a similar device with a flow rate of above 5L/min of drain cock. When water is present

And freezing temperatures during the test, the liquid into the container from above.

b) proved to be suitable for various liquids (or a suitable test fluid).

c) metering pump (minimum liquid reserves 6L), for liquid input into the test chamber, its speed see 11.2 stipulates fine

Of 2%.

d) climate chamber, the temperature can range from -25 °C ~ 70 °C, the precision 2K.

e) Test the temperature at -40 °C ~ 40 °C, the climate chamber temperature should vary within the range of -50 °C ~ 40 °C, the precision

2K.

f) timer, time is displayed in units of 1s, the minimum total range of 24h, precision 2s.

11.1.4 Test Method

11.1.4.1 ready

Test the sensor should be installed at the bottom of the container to ensure that the contact with the test, but not in contact with the liquid out of the hole location. As much as possible

Accessories supplied by the manufacturer. Accumulator means test vessel and metering pump should be installed in the climate chamber. It should be instructed by means of test sensors

Outer box mounted on climate, environmental conditions in the laboratory. To prove before the sensor system is checked and tested for a variety of liquids, in

Metering pump liquid injected into the memory test or the right amount of liquid.

11.1.4.2 stabilized

Before starting the test, and the sensor system is fully operational, the climate chamber to a predetermined test temperature requirements, and internal temperature

After the test reaches a predetermined temperature ± 2K maintaining 30min.

11.1.4.3 Program

Each test should be carried out using the correct level, according to the following procedure.

a) for the leakage indicator to check if the display has a liquid is present, the test is terminated;

b) metering pump set to a predetermined pumping rate;

c) Clear timers;

d) Turn the metering pump;

e) When the liquid starts to flow into the inlet means test vessel, the timer is started;

f) The method according to the manufacturer's instructions specified when the leakage indicator is displayed for the first time the presence of liquid, or if more than the maximum response

Rooms, stop the clock and close the metering pump;

g) recording timer through time (ie, the measured reaction time);

h) Clear timers;

i) Open the drain cock of the test vessel, or start the siphon;

j) the container is emptied of liquid starts a timer;

k) The method according to the manufacturer's instructions specified when the leakage indicating device indicating the liquid does not exist, or if more than 20h

After off timer;

l) traveled timer recording time (ie, the measured recovery time).

11.1.4.4 Test Progress

The following test was conducted twice. First and only test liquid, and then water was repeated once. The depth of immersion by sensors

10% of the depth of the effect, 50%, 90% respectively. For each liquid, the following test should be repeated in order to prove that the sensor system qualified.

11.1.4.4.1 Ambient temperature

-20 °C [-40 °C]

Metering pump rate. 10L/h

Maximum reaction time. 30min

11.1.4.4.2 Ambient temperature

-20 °C [-40 °C]

Metering pump rate. 50L/h

Maximum reaction time. 6min

11.1.4.4.3 ambient temperature

20 °C [40 °C]

Metering pump rate. 10L/h

Maximum reaction time. 30min

11.1.4.4.4 ambient temperature

20 °C [40 °C]

Metering pump rate. 50L/h

Maximum reaction time. 6min

11.1.4.4.5 Ambient temperature

60 °C

Metering pump rate. 10L/h

Maximum reaction time. 30min

11.1.4.4.6 Ambient temperature

60 °C

Metering pump rate. 50L/h

Maximum reaction time. 6min 11.1.4.4.7 If the pour point of the test liquid at -25 °C [-45 °C], the test 11.1.4.4.1 and 11.1.4.4.2 in the pour point temperature plus 5K

Degree carried out.

11.1.4.4.8

If the test liquid flash point below 70 °C, the test temperature 11.1.4.4.5 and 11.1.4.4.7 in the next flashpoint minus 10K get on.

11.1.5 Test results

For the test of a liquid, and 11.1.2 should be compared. If any one of any one indicator test does not reach, or not

Under the presence of the liquid to leak directions (except during recovery), it is determined that the test failed sensor system shall not be used for this kind of solution body. The failure of any one will not affect the sensor system is applied to other test liquid through eligibility. Any one test, both

Cope with the worst response time and recovery time to be recorded.

11.1.6 sensor flag

Each sensor should have the following signs.

a) approved liquid (after sensor test);

b) the reaction time (for each of the approved test fluid, select the longest time);

c) recovery time (for each approved by the test fluid, select the longest time).

Alternatively, the labeled instructions containing the same information on the sensor.

Liquid film-forming liquid sensor for detecting water on 11.2

11.2.1 Test Purposes

11.2.1.1

proof in the monitored area, a sensor system to detect liquid form suitable floating on the water of the film, the high water level in the region

The degree of change. Test should be done to prove.

a) sensor system detects a thickness of 0.5mm film floating on the water to monitor the area, its worst-case response time small

At 6h;

b) After removing the sensor from the stock solution to quickly recover, manually reset and restart; or direction sensor system under reservoir conditions

After the system was removed from the reservoir, which required recovery time of less than 20h.

11.2.1.2

sensor system should be applied to the detection of liquid requirements. As far as possible be tested separately by these liquids, if the test may

When significant risk of accidents, can be used with similar chemical and physical properties of the liquid do less harmful alternative tests, for example, the

Replace gasoline naphtha.

11.2.2 Assessment

11.2.2.1

sensor should be installed in an inner diameter of 100mm or other monitoring wells in the shelter, and when the monitoring wells or other coverings

The amount of change in liquid level in the 500mm, it is possible to realize its function. If the following conditions are met, the test by.

a) when no liquid is present in the test, it does not indicate the presence of the test liquid;

After b) When the sensor is immersed in water, to varying degrees, the test fluid at a rate of 10L/h for the first time into the test system, 30min within transmit signal;

c) floating on the surface of the liquid film thickness of 0.5mm test signals within 6min into the system;

d) After the test liquid is removed, the sensor recovery time, or can be easily restored, in situ manually reset and restart in this case

Under alarm condition has been instructed until reset. If applicable to the recovery time, it should be removed and the longest test liquid

After 20h inside.

11.2.2.2

above test should be carried out at a temperature of (10 ± 2) °C for.

11.2.3 Test apparatus

Test device shall be of the following components.

a) Test for vertical cylindrical vessel is flat, horizontal cross-sectional area (0.1 ± 0.002) m2 (ie 0.01m deep volume of liquid

Equal 1L), the minimum depth of 0.6m. In the bottom of the container should be set up one or more containers flush with the surface of the liquid to facilitate

Into the device, but not used in the test, the test is to be plugged with stoppers. Install a similar device, the above

With a flow rate of 5L/min of drain cock.

b) an appropriate amount of test fluid for a variety of sensor systems.

c) climate chamber, the temperature may be in the range of 0 °C ~ 20 °C adjustment precision 2K.

d) When the recorder, time is displayed in units of 1s, the minimum total range 24h, precision 2s, and with the sensor system indicates leakage

Means connected to the recording film from the water reservoir to leak into the system indicating means for indicating the time against their presence.

e) timer, time is displayed in units of 1s, the minimum total range of 24h, precision 2s.

f) pipette or similar device that can accurately measure the test and measurement of liquid 50mL.

11.2.4 Test Method

11.2.4.1 ready

The test container is mounted in a climate chamber, and water to a suitable depth in the container. Test the sensor should be placed in relation to the water

Normal position, as far as possible using the accessory manufacturer. Then, install the weather outside the box indicating device in the laboratory environmental conditions, and with

The sensor is connected to the test. The sensor system is powered, in accordance with the instructions provided by the manufacturer to start, allowing the system to normal operation.

11.2.4.2 stabilized

Before starting the test, the sensor system should be running in the open state; climate chamber should be pre-set to the required test temperature (10 ±

2) °C, and when the internal temperature reaches a predetermined test temperature is kept 30min.

11.2.4.3 Program

Each test should be carried out using the correct level, use the following procedure.

a) on the pointing device to check leakage. If the indicator liquid is present, the test is terminated;

b) timer is cleared;

c) using a pipette or similar device to accurately measure liquid 50mL of the test, the test vessel and placed near the sensor

On the water, so the water in the reservoir stretched to form a film;

d) Open chronograph;

e) When the test liquid starts to flow into the inlet means test vessel, the timer is started;

f) When the leakage indicator indicates the water surface of the first test of the liquid film exists, stop the clock, and records used for the measurement of the reaction time;

g) If the recovery time of application, the timer is cleared;

h) Open the drain cock of the test vessel, or by siphoned off;

i) When the container is emptied of liquid in the test, the timer is started;

j) A method according to manufacturer's instructions specified when the leakage indicating device indicating the liquid does not exist, or if more than 20h

After stop the clock;

k) record through the timer time (ie, the measured recovery time).

11.2.4.4 Test Progress

Test sensor system twice under the following conditions. deep water in the effective length of the midpoint of the sensor; effective length of the sensor

End, at 10% of the effective distance.

11.2.4.5 Test Results

For the test of a liquid, and 11.1.2 should be compared. The reaction...