Technical lexicon
Accessories for connecting the meter and pipe with a hose.
Simple connection with plug-in coupling on the measuring device and adapter.
Use of a device by using the battery (usually built-in energy storage).
Big advantage over steel tools: they are only half as heavy.
Easy on the back and low weight during transportation.
After the pressure build-up in a pipe system, a stabilization time must be waited for.
The actual test then begins.
According to TRGI 2018, the adjustment time is part of the test.
The duration of the adjustment time for the leak test of gas pipes depends on the volume
The execution check is a visual check to ensure that all installation rules have been applied correctly.
Clean, even cutting of metal sheets at the eaves with one cut.
The notching tool is a manual tool for quickly creating (notching) of a clean eaves finish for angled and double standing seams.
A pipe that is depressurized for work to be carried out is referred to as being out of service.
Avoidance of errors during testing thanks to the automatic test sequence. All test parameters are preset.
The test runs automatically and stops after the specified test time.
In physics and technology, bar is the unit for pressure, i.e. how much weight is applied to a part.
baros (Greek) ≙ weight
During the load test, the material is checked for strength and the connections for durability.
This is done before plastering or covering the gas pipes.
The newly laid pipe without fittings and without gas appliances (shut-off valves may also be tested if they can withstand the test pressure and are open during the test, PN 1) is subjected to a test pressure of 1 bar.
The test medium is air or an inert gas (inert gas). No pressure drop must be detected during the test duration of at least 10 minutes.
Temperature compensation is not required, but is useful.
The resolution of the test device is at least 0.1 bar.
The test pressure is 1 bar (1000 hPa).
During the test, it is recommended that the pipe be tapped and the joints lightly tapped. Leaks must not be visible.
See reference operating pressure
Bending machines are used to bend sheet metal in several work steps on the construction site.
RAU bending machines are available in working widths of 300, 500 and 1000 mm and a working depth of 50 to 500 mm.
Bending sheet metal into shape and adapting it to structural conditions.
This requires different tools for bending and folding.
A bending device for folding to a fixed height of 40 and 50 mm.
It is used for non-profiled sheet metal panels as preparatory work for double folding.
Gas tester with hydrostatic pressure column, water column measuring device with test tube and scale for reading the pressure.
These test devices are mostly used in the low-pressure range with operating pressures of up to 100 hPa.
A rebate profile with clip relief provides free space for the adhesive foot in the surface, in the profile, no scraping and rubbing of the shares on the hook, nail or screw head, stiffening of the shares through additional edges, unhindered absorption of transverse expansion.
The gas leak test in accordance with TRGI 2018 G600 is carried out with a test pressure of 150 hPa, volume-related adjustment time and test time.
The purpose is to visualize the finest leaks.
Pipelines with fittings (gas appliances and control and safety devices are not tested!) are tested. No pressure drop or pressure increase must be detectable on the measuring device. Implementation for newly laid gas pipes, for pipes that are no longer used as gas pipes for their intended purpose and in the long term, and for pipes that have been taken out of service (depressurized for work to be carried out).
The leak test on drinking water installations can be carried out with compressed air, inert gas or water.
- Implementation with air if:
- Longer downtime from the leak test to commissioning
- due to a frost period
- Implementation with water:
- a water exchange is ensured at regular intervals, at the latest after 2 days, from the time of the leak test until commissioning
- House or construction water connection is flushed and approved for operation
- the filling has hygienically flawless components
See test pad
With pre-profiled sheet metal panels, the angle seam can be closed to form an angle double seam (double seam) in a single operation.
For smaller roof areas and corners, the sheet metal panels are folded up to an installation height of 40 or 50 mm and rebated.
The measuring device displays the pressure present in the pipe system.
It is usually displayed in bar.
See load test
See pump
Digital transmission of pressure to the measuring device.
By providing proof of DVGW certification, the manufacturer voluntarily demonstrates that it complies with the recognized rules of technology and shows that the product is suitable for the intended use.
Are used when processing stainless steel sheets to prevent extraneous rust caused by corrosion and thus stains.
Electronic measuring devices are all non-hydrostatic (water column) measuring devices whose pressure sensor is a pressure sensor.
The display accuracy is at least 0.1 hPa.
Saving the measurement results, on-site printout and data management are just some of the advantages compared to water column measuring devices.
Natural gas pipes in buildings are usually made of metal.
In the ground, the pipes can also be made of plastic (HDPE): Indicator color yellow RAL 1003 (formerly RAL 1021)
See gas leak test
Used for fittings for aerators in the sanitary sector.
See gas leak test
Spring pressure gauges are gas testing devices that are used for pre-testing or load testing.
A test pressure of 1 bar (1000 hPa) is generally built up for testing.
Is the pressure at which water or gas flows after the valve is opened.
Colorless, flammable and odorless gas of the hydrocarbons C3H8.
Propane gas is heavier than air.
Propane gas is highly flammable and forms an explosive mixture between 2.12% and 9.35% by volume in air.
Line from the liquid gas tank to the consumer.
The pressure present in a gas pipeline during operation is referred to as the gas connection pressure.
This varies from region to region: fluctuations of 17 to 25 hPa for natural gas, 50 hPa for liquid gas.
If the connection pressure is too low, all shut-off, metering and control devices in the gas pipe as well as the gas appliance tap should be checked.
The gas pressure p is the measured static overpressure compared to the atmosphere and is given in hPa or mbar in the low pressure range.
See gas detector
To detect leaks in pipe connections.
Hydrogen chloride usually indicates gas in gas pipes.
Pipes in operation that carry gas as intended must be inspected for serviceability and structural condition every 12 years.
This includes all pipelines with fittings (gas appliances and control and safety devices are not included in the inspection!)
The test is carried out at operating pressure.
The determined leak rate (see leak rate) refers to the operating pressure.
Hand tool for sharp edging of sheet metal and stop so no marking necessary.
For inflating to test water pipes with air.
Uniform inflation prevents destruction of the digital pressure sensor.
See gas leak test
This is the pipe that leads from the public network (street) to the main shut-off device (fire tap) in the building.
It is located at a depth of 0.6 – 2 meters.
An appliance (gas boiler, oil boiler, pellet or heat pump) that generates heat and produces heat for a house.
The pressure (= 100 Pascal) or hPa is measured .
Formerly also millibar (mbar) or 1 mm water column. 1 hPa ≙ 1 mbar
Inert gases are inert gases, for example nitrogen.
A check that devices are installed on all cable connections and that unused connections are stored properly.
A time interval is the time interval, time section, period, part of a running time.
A time interval extends from its zero point to the later result as the end point.
For example, when measuring pressure in sections over a longer period of time.
See wastewater pipes
See L-BOXX
outside air into compressed air (compressed air).
A piston compresses the air. Apply air slowly into the line to prevent damage to components.
A pipe is considered to be temporarily disconnected if it is only depressurized for a short time, but is constantly under supervision during this time and no work is being carried out on it.
System case for clearly arranging measuring devices and accessories, for example.
Several cases can be connected to each other and transported together.
If pressure and ambient temperature are measured over a longer period of time.
Leaks in pipe connections or pipe corrosion.
Here, a gas pipe is checked with operating pressure and time window to determine the degree of leakage.
Measuring device for determining the recurring 12-year serviceability test.
The leak meter is used to determine the serviceability of a gas pipe.
Also serviceability test.
Used to check an existing gas pipe.
The result determined from the serviceability test.
Leakage rate in l/h:
- 0.0 = tight
- 1.0 = unrestricted usability
- 1.0 < 5.0 = reduced serviceability (tight in 4 weeks)
- 5.0 = no usability (have blocked)
Is the volume of hollow bodies.
The measurement types for a gas pipe differ primarily in the test pressure, the test time and the subsequent assessment of the measurement result.
- Load test 1000 hPa
- Leak test 150 hPa
- Serviceability test 24 hPa
Value that is measured after an elapsed time.
Used to determine physical quantities.
Is the water pressure in millimeters of water column.
When measuring pressure, the value is given in millibars (mbar) or in the unit for pressure hectopascals (hPa).
1 mbar ≙ 1 hPa ≙ 100 Pa
Deviation with underpressure
Use of an appliance by using the mains supply.
A newly laid pipe is a pipe for which the specialist company still provides a warranty.
A pipe carrying gas as intended is not fit for use if the determined leakage rate exceeds 5.0 l/h. The pipe must be shut off.
During pressure measurement, the pressure is adapted to the atmospheric pressure and the ambient pressure.
A defined solution for setting a measuring device to zero in order to check.
The pan corner canter is a practical tool.
It creates exact bends for pan corners at any desired angle without reworking.
Compressed air coupling.
Coupling socket and plug together.
Colorless, flammable and odorless gas of the hydrocarbons C3H8.
Propane gas is heavier than air.
It is highly flammable and forms an explosive mixture between 2.12% and 9.35% by volume in air.
The timing of the entire test, i.e. the fitting time and test time together, is referred to as the test duration.
The test pressure is the level of pressure when carrying out a test on a gas pipe.
The test pressure for the leak test is 150 hPa, for the load test 1000 hPa.
(see also measurement types)
Proof of inspection with result and signature.
Important for insurance in the event of damage.
Also known as a test cushion or sealing cushion. Sturdy rubber balloon for sealing large-diameter pipes.
The test cushion is inflated using a pump and adapts to the inside diameter of the pipe and seals the flow.
See pressure gauge
The duration of the actual test without the adjustment time or temperature equalization.
To generate pressure
This practical tool creates exact bends for pan corners at any desired angle.
Prefabricated, round SPM sheet metal profiles can be easily closed with the round dormer angled rebate closer, even with small radii.
Special profile.
The profile is not folded but only pressed together.
Mostly used for hall roofs.
Tool for closing the angled rebate on barrel or round dormers
Metal hooks into which a gutter is inserted.
The hooks are bent according to the drainage gradient.
With the stainless steel gutter hook bender, you can bend almost all gutter brackets for half-round and box-shaped gutters (dimensions in accordance with DIN 18 461), including larger dimensions.
The leak rate measurement can be determined using different test devices.
To ensure that the results are comparable, a reference operating pressure of 23 hPa is used as the basis for the leak rate.
This means that the determined leak rate in liters/hour (l/h) is calculated to 23 hPa at operating pressures < 30 hPa.
The gas pressure p is the measured static overpressure compared to the atmosphere and is given in hPa or mbar in the low pressure range. – Gas pressure of the non-flowing gas.
The final test is a leak test of the connection points that have not yet been tested.
The time of the test is immediately after the operating gas has been admitted and the gas line has been vented.
- Line parts: Appliance connection lines, gas meter screw connections.
- Operating pressure as test pressure
- Test medium: Service gas
- Test device: Gas detector or test foam
- Test time until the above measuring equipment responds
- Status: no gas leakage detectable at the connection points
Sheet metal can be cut with different tools.
It is important to achieve a clean cut.
Devices such as the hand cutter support a straight cut with a guide rail and leave no edges or burrs (fraying) on the sheet.
A sniffer is used to detect leaks in pipe connections for gas as a medium.
The pipe is inspected and run through to check for visible external defects.
The visual inspection is part of the serviceability test.
Tip: This can be carried out during the ongoing leakage measurement.
Connection of two adjacent metal sheets (panels).
A pipeline that has not been used as a gas pipeline for its intended purpose and for a long period of time is considered to be decommissioned.
When it is put back into operation, it must be tested and leak-proof, just like a newly laid pipeline.
This practical tool creates exact bends for pan corners at any desired angle.
An SPM profile is an angled seam profile from the seam forming machine.
This finished profile is used for hall roofs, for example.
Derived from the Middle High German “Tropfen” or “Abtropfen”.
It refers to the lower end of a roof where the rainwater runs off or drips off, the drip edge on the roof of a building.
This is where the collected water runs off into the gutter (rain gutter).
The length of the eaves is the width of the roof.
With a working width of 250 mm, the eaves canter enables the sheet metal to be folded in quickly and cleanly at the eaves, dormers or similar.
With a working width of 220 mm, the eaves closer ensures quick and easy folding of the sheet metal.
After the pressure build-up in the pipe system, a stabilization time must be waited for.
The actual test then begins.
According to TRGI 2018, the adjustment time is part of the test and depends on the volume when testing gas pipes for leaks.
Technical rule for gas installations.
The DVGW (German Technical and Scientific Association for Gas and Water) is the publisher of the TRGI (currently TRGI 2018).
See water column measuring device
The temperature of the air in the immediate vicinity of an object.
It is important for measurements that the measuring device adapts to the ambient temperature in order to avoid incorrect measurements.
A pipe carrying gas as intended is fit for unlimited use if the determined leakage rate is less than 1.0 l/h.
However, the pipe should be checked again after 2 years.
The “non-pressed leaking” property guaranteed by many manufacturers is an important quality feature for a piping system with press connection technology.
This is because any crimping that is not detected – if accidentally forgotten during the pressure test – represents a considerable risk of damage.
A pipe carrying gas in accordance with its intended use is deemed to have reduced serviceability if the leakage rate determined is between 1.0 l/h and 5.0 l/h.
This must be rectified within 4 weeks.
See load test
This is a technical system of pipes and connecting parts for transporting water from the source (treatment) to the house.
Before a water pipe is put into operation, it must be checked for leaks.
A water column gauge is a gas testing device with a hydrostatic pressure column, water column gauge with test tube and scale for reading the pressure.
These test devices are usually used in the low-pressure range with operating pressures up to 100 hPa.
The test results are noted by hand.
The angled seam is used for pre-profiled sheet metal panels.
The seams are closed with the angled seam closer.
The manual angled rebate closer is used to close the SPM 30/80 profile.
The angled rebate closer shows its full strength on extremely angled façade fronts.
The closed angle fold is closed to form a double fold.
This requires a tool such as the angle double folder.
The angle double folder allows quick and easy closing from a closed angle fold to a double standing seam in a single operation.
Zentralverband Sanitär Heizung Klima.
The Central Association for Sanitary, Heating and Air Conditioning (ZVSHK) is the supreme interest group for the sanitary, heating and air conditioning trade in Germany.
At the head of the SHK organization, it represents the interests of the guild companies vis-à-vis business, industry, politics and science.
It is particularly involved in SME policy and trade policy.
