1 2 3 4 C. ^aц?io^aё?ь?^и?й? 1 2 3 4 5 CONTENTS
Page
Foreword IV
1 General 1
2 Records 5
3 Quality Control Testing 6
4 Inspection procedures and switching
rules for inspection by attributes -
Tables 3 to 7 17
5 Inspection procedures and switching
rules for inspection by variables -
Tables 8 to 10 19 EN 295-2:1991 - - - У? а?) b) с?)
^AЦ?IO^AЁ?Ь?^И?Й? VITRIFIED CLAY PIPES AND FITTINGS AND PIPE JOINTS FOR DRAINS AND SEWERS -Part 2: Quality control and sampling
1 1.1 1.2 EN 295-1:1991 EN 295-3:1991 EN 45011:1989 EN 45012:1989 ISO 2859-1:1989 ISO 2859-2:1989 1 General
1.1 Object and field of application
This part of this European Standard specifies requirements for manufacturer’s internal quality control, third party assessment and inspection. NOTE: Where reference is made to clauses in EN 295-1 and EN 295-3 it is clearly stated.
1.2 References
EN 295-1:1991 Vitrified clay pipes and fittings and pipe joints for drains and sewers: Part 1: Specification
EN 295-3:1991 Vitrified clay pipes and fittings and pipe joints for drains and sewers: Part 3: Test Methods
EN 45011:1989 General criteria for certification bodies operating product certification
EN 45012:1989 General criteria for certification bodies operating quality system certification
ISO 2859-1:1989 Sampling procedures for inspection by attributes: Part 1 Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection
ISO 2859-2:1989 Sampling procedures for inspection by attributes: Part 2 Sampling plans indexed by limiting quality ^QL) for isolated lot inspection
ISO 3951:1989 ISO/DIS10012:1990 EN ISO 9001:1994 EN ISO 9002:1994 1.3 B 1.3.1 1.3.2 1.4 B^y 1.4.1 1.4.2 B^y B^ 1.4.3 ISO 3951:1989 Sampling procedures and charts for inspection by variables for percent nonconforming
ISO/DIS10012:1990 Measurement and calibration systems
EN ISO 9001:1994 Quality Systems - Model for quality assurance in design, development, production installation and servicing (ISO 9001:1994)
EN ISO 9002:1994 Quality Systems - Model for quality assurance in production, installation and servicing (ISO 9002:1994)
1.3 Definitions
1.3.1 Batch
A clearly identifiable collection of units manufactured essentially from the same materials and under the same conditions (see 3.2.2, 3.5.2 and 3.9.1 as appropriate)
1.3.2 Isolated batch
A clearly identifiable collection of unassisted units not exceeding 3200 in number manufactured essentially from the same materials but not necessarily all manufactured or fired at the same time
1.3.3 A joint design of substantially different shape and / or substantially different material than previously made by a manufacturer
1.4 Internal quality control and third party assessment
1.4.1 Quality supervision
Quality supervision shall comprise internal control (1.4.2) and third-party assessment and inspection (1.4.3).
1.4.2 Internal control
Internal quality control shall comprise continuous inspection carried out by the manufacturer as part of an approved third party assessment to ensure compliance with the requirements of EN 295 under a quality system complying with EN ISO 9001 or EN ISO 9002 or equivalent.
1.4.3 Inspection and audits by third party assessors
The third party inspection shall be carried out at least twice a year without previous notice.
The assessors shall visit the manufacturer’s works to inspect testing and to check records. In addition, the third party assessor shall carry out audits according to Table 1.
The third party assessors shall comply with the requirements ofEN 45011 and EN 45012 or equivalent. Table 1 - Scope of Audit by Third Party Assessors as applicable
Visual inspection 2.5, 2.6, 2.7 2, 3 3 Marking 6.1 - 4 Watertightness 2.14 9 O One sample of one nominal size 6 18.4 O One joint assembly of one nominal size 9 Marking 6.2 -
EN 295-1 Requirements as in EN 295-1 Number of samples 11 Polyurethane sealing elements Resistance to ageing 3.1.2 15.6 16 Rubber sealing elements attached to pipe Ozone resistance 3.1.1 14 17 Melt flow index 3.1.3 16.1 O Three samples of one nominal size 22 According to items 8-21 above as applicable1.5 1.5.1 1.5.2 а?) b) с?) 1.6 2 ^ 1.5 Sampling of fired ware
1.5.1 Selection of samples
The samples of fired ware for testing shall be selected at random.
1.5.2 Change in batch condition
For the purposes of these quality control scheme requirements, each of the following, either singly or in combination, illustrate a change in condition, whereby units of fired clay cannot be considered as being from the same batch as they are not manufactured essentially from the same materials and/or under the same condition:
a) Alterations to firing conditions (other than those required to maintain a setting).
A clay blend formula is changed.
c) Any experimental work with temperature or clay blends.
1.6 Calibration
The measurement and calibration of inspection equipment shall be carried out in accordance with the requirements of ISO/DIS 10012.
2 Records
Records as required by EN ISO 9002 shall be maintained for a minimum period of 10 years.
In addition to maintaining records as required by EN ISO 9002, the following records, where applicable to a firm’s production, shall be similarly maintained.
Data indicating the blend (or stockpile) of clay used and the dates of production of fired ware manufactured from that blend from any kiln.
Details of pipes and fittings which have been glazed and the glaze used.
Details of fired fittings which have been surface treated after firing together with the specifica- tion(s) of materials used.
The specification of materials used for fixing fired parts together with certificates from the material supplier(s) in respect of each consignment showing compliance with the licencee’s specifica- tion(s) nominated, as required by EN ISO 9002.
3 3.1.1 3.1.2 3.2 3.2.1 Pe P 3.2.2 а?) b) с?) l Functional dimensions for sealing elements and fairings for every design and nominal size of flexible mechanical joint.
Details of materials used for fairings and non-rub- ber sealing elements for every design and nominal size of flexible mechanical joint, together with certificates from the material supplier(s) in respect of each consignment showing compliance with the licencee’s specification(s) nominated, as required byEN ISO 9002.
3 Quality Control Testing
3.1.1 Visual inspection
Products shall be visually inspected for freedom from such flaws as would impair their function when in service. Samples shall be selected for testing after the rejection of such flawed products.
3.1.2 Rejection after retest
In the event ofa batch being rejected after re-testing, it may be 100% tested for the feature in question, and only those items found to comply will be accepted.
NOTE: Any batch of pipes and/or fittings/or joints which has failed to meet the requirements of EN 295-1 may be offered for an alternative specification for which it qualifies if applicable, and marked accordingly.
3.2 Pipes
3.2.1 Routine testing
Routine testing shall be carried out on pipes for the requirements of EN 295-1 clauses 2.2 to 2.5, 2.9 and 3.6, also Table 12 for the mean values of d 3 and Table 11 for the mean values d 4 if the diameters are measured to clay surfaces.
3.2.2 Batch sizes
а?) Continuous kilns - not greater than the production drawn from one kiln, within a one week period, sub-divided according to nominal size and strength class.
b) Intermittent kilns - total production from one kiln, per firing, sub-divided according to nominal size and strength class.
c) Isolated batch - as in 1.3.2.
3.2.3 b) 3.2.4 3.2.5 3.3 Pe 3.2.3 Sample size for pipes for quality control at the manufacturer’s works
Sampling and testing procedures in respect of any batch shall be completed prior to removal from the works and shall be in accordance with either
(a) Clause 4 and Tables 3,4, and 6 and their switching rules which are consistent with ISO 2859 atanAQLof4% and inspection level S3 for sampling of continuing series of batches by attributes.
or (b) Clause 5 and Tables 8, 9 and 10 and their switching rules which are consistent with ISO 3951 at an AQL of 4 % and inspection level S3 for sampling of continuing series of batches by variables.
or (c) Table 7 for sampling of isolated batches by attributes (Maximum batch size 3200).
3.2.4 Retest procedure for pipes from resubmitted rejected batches
Batches rejected under the sampling procedure specified in 3.2.3 or 3.2.5 may be resubmitted once, after the removal of pipes with previously undetected defects, under the tightened procedure given in Table 7 in respect only of the defect that caused initial rejection.
In the event of a batch being rejected after retesting it may be 100% tested for the feature in question and only those items found to comply will be accepted.
3.2.5 Sampling after delivery from the manufacturer’s works
Sampling shall be in accordance with Table 3 except where a batch is resubmitted after rejection when 3.2.4 shall then apply.
3.3 Regular test - Pipes to EN 295-1
Clause 2.14 - Water tightness
These tests shall be carried out at least weekly at the rate of one pipe or pipe section from each nominal size manufactured during that week. In the event of a test failure a further 3 tests shall be carried out on the same nominal size of pipe. Should a further failure on retest occur then the 3.4 3.5 3.5.1 Pe use of the certification markon the nominal size of pipe affected shall be suspended until the cause of the failure has been identified and eliminated. Use of the certification mark may be reinstated following 3 successful tests on the same nominal size of pipe.
3.4 Optional tests -
Pipes to EN 295-1 Clauses 2.10 - Bending tensile strength, 2.11 - Bending moment resistance, 2.13 - Fatigue strength under pulsating load, 2.15 - Chemical resistance, 2.16 - Hydraulic roughness and 2.18 - Airtightness.
Optional tests for pipes may be carried out if required by purchasers but only after agreement b