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Pipes and fittings of stainless steel for drainage systems under gravity or vacuum

By industries, hospitals, shipbuilding, big kitchens for communities, drainage waters are charged with several sustances which are often corrosive. In certain concentrations and temperatures these chemicals may damage – chemically, mechanically  or per electrolysis – the materials they come in touch with.

Therefore the piping systems that evacuate such wtaers must be made of suitable materials to reasonably withstand the corrosive agents. To comply with this need STECKDRAIN proposes a programme of drainage piping of stainless steel AISI 304, AISI 316, and, upon request, in other particular materials.

STECKDRAIN programme of stainless steel

All compoents of STECKDRAIN programme, i.e. Pipes and fittings, are obtained from electrically seam welded pipes of austenitic stainless steel.

Material quality  AISI 304
UNI X 5 Cr Ni 18 10
Material quality AISI 316
UNI X 5 Cr Ni Mo 17 12



For special purposes other materials are available.

Resistance to Corrosion

Austenitic chrome-nickel steels have excellent characteristics of resistance to corrosion, and are therefore preferred when they come in contact with food, weather and sewage water. They are normally used by many industries (chemical and pharmaceutical, food and beverages, dairy, soap), shipbuilding, community kitchens, etc.
Steels with chrome-nickel-molydenum, thanks to their good resistance to acids and pitting corrosion , are employed for draining certain organic and inorganic acids. On the contrary this alloy may have  a limited resistance to reduced acids and chlorides.On request is available a list of compatibilities of stainless steel AIS 304 and AISI 316 against a number of substances.

Thermal expansion
The expansion coefficient of stainless steel is very low: 1 meter of pipe heated to 100ºC increases its length of only 1ˏ6mm. Therefore in designing a drain system with the STECKdrain programme the thermal elongation can be disregarded as well as all compensators. This is also true when a piping is laid within concrete, as steel has the same elongation factor as concrete (0.0117 mm/mºC).
The sealing ring is a gasket of a particular shape that fits within the socket of the pipe or fitting in such a way that it grips on the whole rim of the socket. When the spigot of the other piece is inserted into the socket the ring is compressed between the outer surface of the spigot and the inner surface of the socket with a positive seal.
The grip over the rim of the socket has the twofold aim to hold the seal i nits place when inserting the spigot as well as to evidence to the assembler the correctness of the joint. If the internal pressure increases, also the pressure of the seal against the wall increases, and the joint remains tight.

Standard seals are of EPDM.
On request are available seals of:
  CR       =          Neoprene
as well as FKM and Si (silicon).
Shapes and dimensions
The Socket
The socket of STECKDRAIN pieces has a double annular shape in which it is lodged the seal and inserted the spigot. The peculiar shape of the socket gives strength to the joint and ensures its tightness in the time in spite of axial and cross stresses that may be exerted from outside and/or the weight of the piping system. The socket and spigot STECKDRAIN joint is officially certified and the manufacture of the components of the programme undergoes periodic external survey.
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