AS 1528.4 pdf download

AS 1528.4 pdf download.Stainless steel tubes and tube fttings for food processing and hygienic applications
1  Scope
This Standard specifies requirements for welded-type and expanded-type clamp tube fittings, comprising clamps, clamp liners (ferrules), end caps and gaskets in tube couplings for effecting joins in pipelines in food processing and hygienic applications. Requirements for materials, dimensions, and surface finish are specified. Dimensions for a clamp coupling assembly are specified in Appendix B. Clamp liners in tube couplings for food processing and hygienic applications are intended to be used with stainless steel tubes in accordance with AS 1528.1 and fittings in accordance with AS 1528.2 and AS 1528.3. NOTE  Information to be supplied for purchase is given in Appendix A.
3  Terms and definitions
For the purposes of this Standard the following definitions apply:3.1 clamp ring-shaped tube coupling part with taper-sided channel section 3.2 clamp liner (ferrule) flanged tube coupling part, with one conical face to provide means for connecting mating liners 3.3 clamp tube coupling coupling with two liners intended for joining tube ends together by means of a clamp and gasket 3.4 end cap solid cap with one conical face to provide means for connecting to a mating liner and gasket to close off a line 3.5 expanded-type clamp liner clamp liner to be attached to a tube end by expanding 3.6 gasket ring-shaped tube coupling part intended to make a hygienic liquid-tight joint between the flanges of two clamp liners 3.7 welded-type clamp liner clamp liner to be joined to a tube end by a butt-weld
5  Working pressure
The clamp tube fitting components for sizes 6.35 mm to 152.40 mm shall be capable of withstanding a non-shock maximum working pressure of 10 bar at temperatures from −20 °C to 100 °C, subject to the engineering requirements of the specific application. For working pressures for clamp tube fitting components for sizes 203.40 mm to 304.80 mm, contact the supplier for details.
6  Materials
6.1  Clamp liners, end caps and clamps The requirements for the materials shall be as follows: (a) Cast, forged or wrought steel from which liners, end caps and clamps are made shall be austenitic stainless steel and shall be in accordance with a raw material specification that applies to the grade chosen. (b) Components shall be made from one of the high alloy corrosion-resistant steels specified in ASTM A182M, ASTM A240M, ASTM A276M or ASTM A351M. (c) The steel used in welded-type components shall be of a weldable grade. (d) Filler rods for welding shall be pre-qualified as per AS/NZS 1554.6. 6.2  Gaskets Gaskets shall be made from a non-toxic elastomeric material that is suitable for contact under processing conditions with the foodstuffs and cleaning fluids to be used. No odour or taste shall be imparted to the foodstuff. Special gasket materials may be required for temperatures above 100 °C.
12  Surface finish
12.1  External surfaces The external surfaces of the components shall be finished smooth by machining or polishing or both. The fittings, including the threads, shall be free from burrs. 12.2  Internal surfaces The product-contacting surfaces of the components shall be smooth and bright with a finish not inferior to a roughness parameter, Ra, of 0.8 μm as assessed in accordance with the procedure described in ISO 4288. These surfaces shall be free from harmful surface defects and inclusions.
13  Hygienic requirements
13.1  Accessibility of surfaces of coupling All surfaces of the coupling in contact with the product shall be easily accessible for cleaning, either by cleaning-in-place (CIP) methods or by manual cleaning when the coupling is disassembled. Removable parts shall be readily demountable. 13.2  Welded liners Welded liners shall be internally clean and smooth. They shall be free from harmful surface defects or inclusions. 13.3  Gaskets The gaskets shall be of an elastomeric material compatible under processing conditions with the material of the fitting, with the foodstuffs, and with the cleaning fluids. It shall not impart an odour or taste to the foodstuff.