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1、Klass.-Nr. 8K B1 6February 2000 3456 Lines Checking for Impurities PV 3336 Zentralnorm Continued on pages 2 to 3 Fachverantwortung I/GQ-31 Normung: I/EK-P GradlTel: 33904 Vertraulich. Alle Rechte vorbehalten. Weitergabe oder Vervielfltigung ohne vorherige schriftliche Zustimmung der Volkswagen AG ve
2、rboten. Vertragspartner erhalten die Norm nur ber die zustndige Beschaffungsabteilung. VOLKSWAGEN AG - SEAT S.A. - KODA AUTO a.s. - AUDI AG Preface This test specification is used in sample and series monitoring tests. It was written with the aid of DIN 8905-1 and DIN 8964-1. Changes The following c
3、hanges have been made as compared to the November 1987 issue: Sections 1.1, 1.2 and 2.3.1 extended Figure 1 revised Previous Issues First issue: 02.79 Last change: 11.87 1 General 1.1 Scope This test specification is used to determine the impurities rinsed from lines (e.g. fuel lines, brake lines, e
4、tc) and circuit parts (e.g. evaporators, radiators, etc). 1.2Requirements (deviation acc. to drawing) Cleanness of the Interior The lines shall be free of residues from drawing oil, drawing compound, rust, scale, chips or other solid/liquid processing aids. The soluble and insoluble floatable residu
5、e produced by washing out the lines with solvents acc. to section 2.1 must not exceed the following limit values (relative to the inner surface area): Total foreign matter 100 mg/m2 Insoluble matter 60 mg/m2(test acc. to section 2.3.1) Soluble matter 40 mg/m2(test acc. to section 2.3.2) The followin
6、g limit values apply specifically for brake lines: Total foreign matter 30 mg/m2 Insoluble matter 10 mg/m2(test acc. to section 2.3.1) Particle size 20 m Blackening of filterDiscoloration no greater than RAL 9007 gray aluminum Soluble matter 20 mg/m2(test acc. to section 2.3.2) orm Fe 41 01.98 The E
7、nglish translation is believed to be accurate. In case of discrepancies the German version shall govern. Page 2 PV 3336: 2000-02 2 Testing of Cleanness 2.1 Brief Description Manufacturing and processing methods can leave fatty, oily and solid impurities on the inner sur- face of the lines and circui
8、t parts. The limit content of these insoluble, floatable and soluble (fatty, oily) residues must be kept low as they can result in physical, chemical and/or mechanical impairment of the overall system. The specimens are washed with a mixture of equal parts acetone (for analysis) and methanol (for an
9、alysis) and the mass of the eluted substances determined in order to ascertain the insoluble, floatable residue. 2.2 Test Apparatus The setup illustrated in Figure 1 is recommended for the test apparatus. It allows the solvent to be drawn into the previously evacuated line or circuit part under turb
10、ulence, air bubbles to be avoided and fragments of dirt to be effectively rinsed off. The specimen part to be washed is connected at the lowest point (inlet) to the liquid-flow tube that is immersed in the store tank containing residue- free evaporated solvent. The hose section at the specimen part
11、inlet is equipped with a shutoff cock. The specimen part outlet is connected to the glass receiver tank via a short section of hose. The capacity of the glass receiver tank must be greater than the volume of the specimen part to be washed so that the solvent can be collected. The glass receiver tank
12、 is connected by means of a hose to a vacuum pump. A preliminary trial must be carried out to make sure that the hoses are sufficiently resistant to the solvent. The solvent shall, if necessary, be purified by means of distilla- tion. A to the vacuum pumpS Shutoff cock 2D OutletF Specimen G Shutoff
13、cock 1H InletJ Glass receiver tank (vacuum-stable) K Store tank containing solvent Figure 1 Page 3 PV 3336: 2000-02 2.3 Procedure 2.3.1 Determination of the Insoluble, Floatable Residue The test begins with shutoff cock 1 being closed and the specimen part connected to the vacuum pump being evacuate
14、d (vacuum 50 mbar). Shutoff cock 1 is then opened so that the solvent can be taken into the evacuated part. Both shutoff cocks (1 and 2) are closed once the liquid reaches the glass receiver tank and the specimen part is left immersed in the solvent for 10 minutes. The liquid is then suctioned into
15、the receiver tank after the store tank has been removed and the shut- off cock opened. This procedure shall be repeated at least twice. The insoluble residue is separated by means of filtration using a G4 glass filter crucible accurately weighed to within 0.1 mg or a membrane filter with a pore size
16、 of 8 m, dried at (105 to 110) C to the point of mass constancy and reweighed after cooling. 2.3.2 Determination of the Soluble Residue The remaining filtered solvent is transferred to a vessel accurately weighed to within 0.1 mg and the solvent removed by means of distillation in order to determine the soluble residue. The soluble residue can be reweighed after drying in the oven at 105 to 110 C to the point of mass constancy. 2.3.3 Test Scope The number of parts to be tested shall be selected such that an inner surface of at least 0.5 m2 is examined.