technical info

FINISHINGS

FLANGES up to DN200 = steel blasting
FLANGES form DN250 = chemical pickling
COLLARS up to DN300 = steel blasting
COLLARS form DN350 = chemical pickling
HEAT TREATED COLLARS = do not suffer any other finishing method / Mechanization on the outside borders and on the welding surface.
WELDING COLLARS DIN2642 / Mechanization on the neck (s1)

TOLERANCES

FLANGES DIN2642 PN10 for ISO and METRIC pipe, tolerances on the values stated in “d5”
- DN15 – DN25 = +/− 0,5mm
- DN32 – DN125 = +/− 1,0mm
- DN150 – DN300 = +/− 1,5mm

BLIND FLANGES PN10 DIN2527, tolerances on the values stated in “d5”
- DN15 – DN25 = +/− 0,0mm
- DN32 – DN200 = +/− 1,0mm

WELDING NECK FLANGES DIN2633 PN16, tolerances on the values stated in “d1”
- DN15 – DN65 = +/− 0,3mm
- DN80 = +/− 0,4mm
- DN100 = +/− 0,5mm
- DN125 = +/− 0,7mm
- DN150 = +/− 0,8mm
- DN200 = +/− 1,0mm

PRESSED COLLARS 3 and 4mm for METRIC and ISO pipe, tolerances on the values stated in “D1”
- DN15 – DN40 = +/− 0,5mm
- DN50 – DN250 = +/− 1,0mm
- DN300 – DN350 = +/− 2,0mm
- DN400 – DN1200 = +/− 3,0mm

PRESSED COLLARS DIN2642, tolerances on the values stated in “D1”
- DN15 – DN40 = +/− 0,5mm
- DN50 – DN250 (254) = +/− 1,0mm
- DN250(273) – DN350 = +/− 2,0mm
- DN400 – DN600 = +/− 3,0mm

PRESSED COLLARS PN10 HEAD TREATED, tolerances on the values stated in “D2”
- DN10 – DN20 = +/− 0,5mm
- DN25 – DN40 = +/− 0,6mm
- DN50 = +/− 0,7mm
- DN65 = +/− 0,8mm
- DN80 = +/− 0,9mm
- DN100 = +/− 1,1mm
- DN125 = +/− 1,6mm
- DN150 = +/− 1,8mm
- DN200 = +/− 2,2mm
- DN250 – DN300 = +/− 2,0mm

END CAPS DIN28011, tolerances on the values stated in “d1”
- DN15 – DN40 = +/− 0,5mm
- DN50 – DN250 = +/− 1,0mm
- DN300 – DN350 = +/− 2,0mm
- DN400 – DN500 = +/− 3,0mm

MARKING

PRESSURE TESTS

STRUCTURAL TEST

FITTEXPORT, S.A.

Pieces: Flange DN400 and Flange DN80

Proof: 150093/0

FUNDACIÓ ASCAMM
CENTRE TECNOLÒGIC

SUMMARY

1. PRESENTATION
1.1. PROJECT'S OBJECTIVE
1.2. PROJECT'S DESCRIPTION
1.3. GENERAL DESCRIPTION OF THE PIECES
1.4. MATERIAL

2. STRUCTURAL ANALISATION: FLANGE DN 400
2.1. CHARGING HYPOTHESIS DN400
2.2. MAIN RESULTS OF THE TEST
2.2.1. Deformation in perspective.
Global valuation of the deformation
2.2.2. Tensions distribution according to Von Mises criterion
2.3. CHARGING HYPOTHESIS DN80
2.4. MAIN RESULTS OF THE TEST
2.4.1. Deformation in perspective.
Global valuation of the deformation
2.4.2. Distribution of tensions according to Von Mises criterion

3. CONCLUSIONS OF THE STRUCTURAL TEST
3.1. CONCLUSIONS ON PIECE DN 400
3.2. CONCLUSIONS ON PIECE DN 80

FUNDACIÓ ASCAMM
March 2001

1. PRESENTATION

1.1. PROJECT'S OBJECTIVE

Simulation of the structural behaviour of the flanges DN400 / 16" and DN80 / 3" under conditions based on the norm DIN2642's directives.

1.2. PROJECT'S DESCRIPTION

This test will apply a pressure and will derterminate the tensions and deformations that the pieces suffer under that pressure. The pressure will be 10bar on both pieces and will affect the whole inner contact surface in order to simulate the worst possible situation endured by the pieces.

The simulation has been done according to the "finite elements" method. Both pieces have been drawn up in CAD as solids and then matted into tetaedric finite elements to reproduce the simulated volumes in a precise way.

1.3. GENERAL DESCRIPTION OF THE PIECES

Both pieces are flanges for the tube connection. The flange DN400 has a wallthickness of 8mm and a total of 16 holes for screws M-26 radially distributed.

BASIC DIMENSIONS:
Exterior diameter: 565 mm
Height: 45 mm
Thickness: 8 mm

The flange DN80 has a wallthickness of 5mm and a total of 8 holes for screws M-18 radially distributed.

BASIC DIMENSIONS:
Exterior diameter: 200 mm
Height: 22 mm
Thickness: 5 mm

1.4. MATERIAL

The proposed material is stainless steel WNR 1.4301 / 304 which presents, according to the corresponding lab tests, an elasticity limit of 200 Mpa maximum. So 200 Mpa is the maximum allowed tension in these proofs.

2. STRUCTURAL ANALISATION FLANGE DN400

In this part it is shown the used method and the results of the test.

2.1. CHARGING HYPOTHESIS

A series of charges and restrictions have been applied to the pattern of finite elements to do the simulation.

In the following picture it is shown a sample of matted pattern.

In the following diagram can be observed the restriction on the pieces by the effect of the rings and the representation of the 10 bar pressure.

2.2. MAIN RESULTS OF THE TEST ON THE PIECE DN400

2.2.1.Deformed in perspective. Global valuation of the deformations.

The shown tensions cause some deformations on the flange which can be appreciated in the following picture.

2.2.2. Tension distribution according to Von Mises criterion.

In the following picture it is shown the result of the tensions caused by the 10 bar pressure. It can be seen that the maximum tension is accumulated on the interior radio of the flange.

2.3. CHARGING HYPOTHESIS FLANGE DN80

A series of charges and restrictions have been applied to the pattern of finite elements to do the simulation.

In the following picture it is shown a sample of matted pattern.

In the following diagram can be observed the restriction on the pieces by the effect of the rings and the representation of the 10 bar pressure.

2.4. MAIN RESULTS OF THE TEST ON THE PIECE DN80

2.4.1.Deformed in perspective. Global valuation of the deformations.

The shown tensions cause some deformations on the flange which can be appreciated in the following picture.

2.4.2. Tension distribution according to Von Mises criterion.

In the following picture it is shown the result of the tensions caused by the 10 bar pressure. It can be seen that the maximum tension is accumulated on the interior radio of the flange.

3. CONCLUSIONS OF THE STRUCTURAL TEST

3.1. CONCLUSIONS OF THE PIECE DN400

As you can observe in the picture 2.2.1, the maximum deformation is almost 2 decimes of milimeter, which is most remarkable in the inner circle of the flange. Anyway, the deformation is very small so the behaviour of the piece under the biggest pressure can be considered good.

The reason why the flange deforms it is shown on picture 2.2.2., where the tensions according to Von Mises criterion can be appreciated. To ensure that there won't have any deformation, the maximum tension that the piece can endure musn't be higher than 200Mpa. Looking at the picture we can see that the normal tension is 20Mpa, which is very far from the real elasticity limit of the material.

3.2. CONCLUSIONS OF THE PIECE DN80

In the case of DN400 we have seen that the maximum applied charge wasn't any problem for the piece. In the case of piece DN80, the effects of the pressure are even smaller.

The maximum deformations are about 3micra, what means: nothing.

By observing the tensions diagram you can see exactly the reason. The maximum tension is only 9.5Mpa and the elasticity limit of the piece is 200Mpa.

To sum up, this flange also can endure the biggest pressure applied.

Fittexport, S.A. | P. I. Can Parellada, C/ Júpiter 39 (nau 6) 08228 Terrassa (Barcelona) Spain | Tel.:+34 93 786 21 10 Fax:+34 93 786 24 00 | fittex@fittexport.com