Gas house introduction

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Gas house entries or gas house entry combinations (HEK for short) are house entries that are used to safely introduce flammable gases ( natural gas , liquid gas ) into buildings. In Germany, Austria and Switzerland, they must meet specified requirements for safety, strength and service life, which is why simply routing the media pipe into the building is not permitted in these countries.

HEKs can also be part of a multi-branch building.

construction

Gas house lead-in: PE welding end (black), wall pipe (yellow), Firesafe switch handle (red), flange with main shut-off valve below (silver)

HEKs usually consist of a PE weld-on end , a steel-PE transition , a wall pipe and a main shut-off valve .

PE welding end

The house connection line is connected to the PE welding end, which is usually made of PE100 (PE-HD) . The connection dimensions are based on the SDR pipe series.

Steel-PE transition

The steel-PE transition forms the secure connection between the PE welding end and the steel pipe of the wall pipe. It must be designed so that it does not represent a weak point in the pipeline. In the event of damage, the media pipe must fail before the transition gives way.

Wall pipe

The wall pipe can be securely connected to the building due to its external properties. As a rule, the core consists of a steel pipe , as this is not damaged and leaks in the event of a fire in the building. The outside is usually a PE layer, which by its nature enables a secure connection to the building.

Main shut-off device

The main shut-off device consists of a ball valve or valve which is welded to the steel pipe of the wall pipe. Corner fittings such as the corner ball valve have only been used here since 1983. The outlet side of the main shut-off device has a defined connection, e.g. B. internal thread, regulator screw connection , fixed or loose flange .

safety

Gas house inlets contribute to a high level of safety due to their structural design and the installation options, thereby avoiding breakdowns or accidents. Gas house entries must be able to absorb certain tensile and torsional forces that can occur during the service life of a HEK due to external influences. If z. If, for example, the house connection line in the garden is loaded by an excavator attack, neither the HEK nor the building's interior installation may be damaged in order to avoid an uncontrolled gas leak.

A HEK must also be high temperature resistant ( HTB ). In the event of a fire, it must remain tight when the valve is closed and still achieve a certain level of tightness even after the fire has cooled down . Therefore, a steel pipe is usually used in the wall pipe, as currently no plastic can safely withstand the temperatures of a fire.

In addition, HEKs must be connected to the building in a gastight and watertight manner so that no water ( groundwater , seepage water ) and no creeping gas (in the event of a leak in the gas pipe) can penetrate the building.

Gas house entries are usually designed for a service life of at least 50 years.

history

Milestones:

1983 Development of the corner ball valve by Franz Schuck
1986 Creation of the VP601 as a test basis for HEK in Germany by the DVGW
Around 2000 PE100 is becoming the standard material for house connection lines

Admission

In Germany, gas house entries are approved by the DVGW. In Austria this is done by the ÖVGW, in Switzerland by the SVGW. The respective association has developed a test basis according to which the components are tested and assessed.

Redevelopment

Renovation capsule with swiveling mounting plate in vaulted cellar

There are different products and methods for renovating house connections, including house connection pipes. The spectrum ranges from the excavation and complete removal of the old building with subsequent relocation to products that enable trenchless relocation of a house connection. The renovation capsule is often used here.

See also