Pipelines

When it needs to stay permanently tight

Pipelines

We produce ready-to-install piping, bent, with brazed or assembled connections and deformed pipe ends.

In addition to connecting parts for pipelines, MECO also manufactures completely assembled pipes. We have powerful CNC bending machines on which pipes from
Ø 6 mm to Ø 28 mm made of steel and stainless steel are bent. By means of a pipe end forming machine ¬ also cnc-controlled ¬ we can taper, widen, upset hose beads or otherwise form the pipe ends.
Connecting parts (ring pieces, spherical bushings, soldering spigots, connecting pieces, etc.) are brazed on both sides or only on one side of the tube. Union nuts can also be fitted with cutting rings.

Brazing under inert gas

As a rule, the tubes are brazed in a brazing furnace under an inert gas atmosphere.
Afterwards, the brazed joints can be 100% leak tested. In particularly critical cases (e.g. fuel lines), testing is carried out with helium; a vacuum is generated in the process. Testing is always carried out with a leak tester, which is used to determine the leak rate using the differential pressure method. The client specifies the permissible limit value.

We process seamless drawn pipe according to DIN EN 10216, but also welded pipe according to DIN EN 10217. For steel, the starting material is often E-235, for stainless steel 1.4301.
We can measure the tubes with the FARO arm, but also make gauges which are then used in series production. For this purpose, two gauges are always manufactured, one for WE testing at the customer's and one for series testing at MECO. This ensures that the customer and the manufacturer measure with the same gauge, but in two versions. This increases measurement reliability.

Residual dirt

If there are residual dirt requirements for the tubes, we are happy to meet them. The limit value must then be defined before the quotation is submitted. The test is carried out in accordance with VDA Volume 19, after which the pipe is flushed.

After the drying phase, the pipes are sealed with caps on both sides and packed in PE bags to protect them from dirt.

Applications

  • Fuel lines
  • Hydraulic lines
  • Coolant lines
  • Exhaust gas recirculation systems
  • Oil lines (exhaust gas turbocharger)

Technical framework

Dimensions

  • Tube outer diameter 6 - 30 mm
  • Wall thickness 0,5 - 2 mm
  • Length of piping up to 1.5 m

Bending radii

  • approx. 1.5 x D - 2.5 x D
  • up to three different bending radii in one tube

Procedure

Pipe end deformation

  • Expanding and reducing
  • Upsetting hose beads
  • Combinations of both

Mounting

  • Cutting ring pre-assembly by pre-assembly device
  • Joining by press-fitting (for subsequent brazing)
  • Joining by fixing with spot weld (for subsequent brazing)

Soldering

  • High-temperature brazing under inert gas atmosphere in continuous furnace (by service provider) with the following solders:
  • Cu solder (standard)
  • Ag solder (on customer request)
  • Ni-base solder (for high temperature applications up to approx. 850°C)

Materials

Steel

  • E235 +N; 1.0038
  • E235 +C; 1.0038
  • E355 +N; 1.0045
  • E355 +C; 1.0045
  • St30AI

Stainless steel

  • X6CrNi18-10; 1.4301; AISI 304; V2A
  • X6CrNiMoTi17-12-2; 1.4571; AISI 316Ti; V4A, A5

 

Precision steel and stainless steel tubes

  • seamless cold drawn (EN 10305 - 1)
  • welded cold drawn (EN 10305 - 2)
  • seamless cold drawn for hydraulic pressure lines (EN 10305 - 4)
  • welded stainless steel pipes (EN 10217 - 7)

Surfaces

Surfaces according to DIN EN ISO 19598

  • Zinc; transparent passivated; without sealant
    (ISO 19598.Fe//Zn8//Cn//T0)
  • Zinc-nickel; transparent passivated; without sealant
    (ISO 19598.Fe//ZnNi8//Cn//T0)
  • Zinc; transparent passivated; with sealant
    (ISO 19598-Fe//Zn8//Cn//T2)
  • Zinc-nickel; transparent passivated; with sealant
    (ISO 19598-Fe//ZnNi8//Cn//T2)
  • Zinc-nickel; black passivated; with sealant
    (ISO 19598-Fe//ZnNi8//Fn//T2)

other surfaces

  • VDA 235-104
  • VDA 233-101
  • DBL 8451
  • VW 13750 - TL244
  • MAN 183
  • Cathodic dip coatings

 

Testing options

Leak test

  • Differential pressure test with air on a leak tester (leak rate by agreement)

 

Dimensional inspection

  • FARO arm (determination of X/Y/Z coordinates and bending angle)
  • manufactured measuring gauge with measuring protocol

 

Residual dirt

  • Residual dirt analysis according to VDA Volume 19
  • Minimum particle size 200my

Please note the technical delivery conditions!

Examples of customized production

Tankentnehmer

Tank extractor

Material: 11SMnPb30 +C (ultrasonic and crack tested)

Annual quantity: approx. 1,500

Customer: parking heater manufacturer

Special feature: turned, heat treated, bent

Kühlmittelleitung

Coolant pipe

Material: ring socket 11SMnPb30+C (ultrasonic and crack tested); Ü-nut and cutting ring: steel; seamless precision steel tube

Quantity: approx. 150

Customer: Commercial vehicle manufacturer

Special feature: KTL coated

Rohr

Pipe

Material: Ring spigot 1.4305 (ultrasonically and crack tested); welded stainless steel tube 1.4301

Annual quantity: approx. 10,000

Customer: sensor manufacturer (automotive end customer)

Rohr-3

Pipe

Material: turned parts 11SM nPb30+C, seamless precision steel tube

Annual quantity: approx. 200

Customer: Automotive Aftermarket

Surface: Zn, 8my, transparent passivated

Kraftstoffleitung

Fuel line

Material: Ring spigot 1.4305 (ultrasonically and crack tested); welded stainless steel tube 1.4301

Number of pieces per year: approx. 6,000

Customer: filter manufacturer (fuel filter)

Special feature: brazed, 100% leak test with helium, residual dirt requirement

Rohr

Pipe

Material: cutting ring and Ü- nut 1.4571; welded stainless steel tube 1.4301

Number of pieces per year: approx. 72,000

Customer: sensor manufacturer

Special feature: reduced on one side and tube bead upset