AS 1646:2007 pdf – Elastomeric seals for waterworks purposes
AS 1646:2007 pdf – Elastomeric seals for waterworks purposes.
3.2 Splice Joint
Each splice joint shall be tested and shall show no visible sign of separation. The test method shall bc cithcr as spcciticd in the relesant part of AS 611 or in accordance with Appeiidi B.
4 FFFECTON WATER
Those parts of the elastomeric seals that are in contact with drinking waler shall comply with AS/NZS 4020. Unless otherwise specified in the referring product standard, the scaling factor shall be not less than 0.05.
S l)INIENSI()NAI. ToI.I:RANCI:s
In addition to thc rclcsant part of AS 611, dimensional toleranccs shall comply with ISO 3302-I Class M2 for mouldings: Classes E2. EN2, EG2. EW2, 12, and EC2 (as applicable) for extrusions: and Class X3 for flash, unless otherwise specified by the purchaser (see Appendix A).
6 SURFACE I NI PERFECTIONS
Surface imperfection requirements are specified in the reles ant part of AS 681 for the sealing tone. The purchaser ma specify imperfection requirements for non-sealing zones (see Appendix A).
7 OPTIONAL REQLIIRENIENTS
AS 681 Parts I to 4 allows a number ul optional requweinenls. for example. lu temperature performance (down to —25°C). hot water supply (up to 100°C). and oil resistance. Where any of the optional requirements are required they shall be specified by the purchaser (see Appendix A).
Starking shall be in accordanec with the relcs’ant part of AS 681. In addition the purchaser may request additional colour marking (see Appendix A). Where this is requested it shall comply with the colours detailed in Table 2.
Australian Standards are intended to include the technical provisions necessar%’ for the supply of products referred to in the particular Standard, but do not purport to contain all the neccssar> provisions of the contract. In a number of cases thc purchaser is either asked to state requirements or is gisen a choice of options, and these are contractual matters to be agreed upon bctsccn thc purchaser and the supplier.
This Appendix contains advice and recommendations for the information to be supplied by the purchaser to the supplier at the time of enquiry or order. Its aim is to aoid misunderstanding and to result in thc purchaser receiving satisfactory products and services.
Al INFORMATION TO BE SUPPlIED BY THE PURCHASER
At the time of enquiry or calling for tenders or quotations, or order, a purchaser should proide to the supplier the Iolloing information:
(a) ihe elastomeric material to be used iii the manufacture olthe seals.
Ib) The nominal seal hardness.
(c) Dimensional tolerances if ditierent 1mm that specified in Clause 5.
td) Surface imperfection requirements if required tbr the non-sealing ione (see Clause 6).
(c) Optional requirements as referred to in the relevant part of AS 611 and Clause 7.
(f) If colour marking is required (see Clause 1).
(g) Whether a certificate of compliance or a test ccrtiiicat is required (see Paragraph A3).
th) Requirements for packaging and labelling.
A3.l Certificate of compliance
A certificate of compliance should state that the elastomeric material and the seals comply
sith the requirements of this Standard.
A3.2 Test certificate
A test certificate should show the results of tests carried out to establish compliance with this Standard and an other agreed tests.
This Appendix sets out two methods for testing the slice joint in seals using-
(a) the stretch and twist method; or
(b) the bend method.
The bend method shall only be used where the cross-sectional area of the seal is in excess
of 600 mm2.
The joint is either both stretched and twisted, or bent along the two principal directions.
The joint is then examined for any visible sign of separation.
B3.1 Stretch and twist method
No apparatus is required.
B3.2 Bend method
Bending mandrels of diameter equal to or less than D shall be used, where D is determined
from the following equation.