ISO 2037:1992 pdf download – Stainless steel tubes for the food industry
1 Scope
This International Standard specifies the dimensions, tolerances, surface roughness, materials and hygienic requirements for seamless or welded stainless steel tubes in straight lengths for the food industry.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the’ standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 468:1982, Surface roughness – Parameters, their values and general rules for specifying require- ments. IS0 5252:1991, Steel tubes – Tolerance systems.
3 Dimensions
The dimensions given in table 1 have been extracted from I S0 1 1 27:1992, series 1 and 2 outside diameter. For further information concerning the series, see also IS0 4200.
4 Dimensional tolerances
The deviations permitted for the outside diameter and thickness are limited by the tolerances specified in 4.1 and 4.2.
4.1 Tolerance on outside diameter
The tolerance on outside diameters less than or equal to 101,6 mm shall be class D4 in accordance with ISO 5252:1991. For outside diameters greater than 101,6 mm, this tolerance shall be class D3 in accordance with ISO 5252:1991.
4.2 Tolerance on thickness
The tolerance on thickness shall be class T3 in ac~ cordance with Iso 5252:1991. 5 Surface roughness The surface roughness, in accordance with the speci- fications of ISO 468, shall be as follows.
5 Surface roughness
The surface roughness, in accordance with the speci-fications of I S0 468, shall be as follows.
6 Materials
Austenitic stainless steels shall be used. Generally the following steel types are suitable for pressure pur-poses:
– seamless tubes : TS 47, TS 60 and TS 61 in ac-cordance with IS0 2604-23 975;
– welded tubes: TW 47, TW 60 and TW 61 in ac-cordance with IS0 2604-5:1978.
7 Hygienic requirements
7.1 Care shall be taken that any non-ferrous metals or their alloys coming into contact with the tubes during manufacture do not leave deposits which will be harmful during subsequent fabrication and use.
7.2 The interior surface of the tubes shall be clean and smooth. It shall be free from surface defects, inclusions and longitudinal grooving.