System Control |
| The Production of a quality controlled pipe system demands supervision, regulation and control of all work operations. All results and processes have to be documented. |
| |
| This requires |
• Test and acceptance of incoming goods
• Process control
• In-Process Inspection and test
• Final Inspection and test
Relevant regulations for the quality control of potable water pipes system are :
• DIN-Guidelines,
• DVGW - Working Sheets
• Supervisory Regulations of the SKZ (Suddeutsches Kunststoff - Zentrum)
These standards and guidelines detail the minimum requirements for internal control. Conformance to the standards is verified by independent institutes in form of internal audits and laboratory tests.
Nagory has many years experience in extrusion and injection moulding and is the market leader and pioneer in the manufacture of polypropylene supply systems.
This experience is reflected in internal quality standards and laid down procedures, which are taken strongest note of and are documented by the constant quality of our products. |
| |
| Internal Control |
Trained and qualified employees and a modern equipped laboratory ensure that all tests are carried out and regulations are complied with in accordance with the quality control policy, which includes
• Control of Inspection, measuring and test equipment
• Process and production control
• Receiving Inspection and test
• In - Process Inspection and test
• Final Inspection and test
All internal quality control test are documented and recorded in acc. with the quality control policy.
|
| |
| Test and Acceptance of Incoming Goods |
| All incoming goods are subject to a test. This ensures that incoming products conform to specified requirements, goods, which have not been tested are not released for production. |
| |
| In - Process Inspection and test |
The quality plan requires that tests and inspections are carried out before and during production. At the start of production all quality relevant data are checked by the quality assurance department.
Pre- production samples are tested by the laboratory technicians for
• Surface finish
• Dimensional accuracy of the samples
• Data from extrusion and injection moulding machines
The goods are only released for production if optimal test results are achieved. These tests are carried out at the beginning of each production series to ensure perfect system quality.
|
| |
| Process control |
Ultrasonic measurement and process data recording in the field of extrusion are only one example of the extensive quality control process. This equipment enables constant observation and control of production.
Ultrasonic automatically measure and report any deviations in tolerance to the cutting device on the extrusion machine so that the sizing plant automatically isolates a substandard product. This ensures that only perfect quality products are packed and stored.
All data received during production is analyzed in detail. |
| |
| Final Inspection and Test |
The quality plan requires that inspections and tests are carried out on all finished products. The results are documented in tests reports.
Finished products are only released to stock when all tests and inspections conform to the prescribed procedures and specifications.
The final inspections and tests includes time laps test procedures. This enables statements regarding the usability of the products in their later field of application.
These tests are the method for quality assurance during production and for design tests. This is to discover and remove production weakness. The results document the system quality and serve to optimize the manufacturing processes. The final inspection and test covers the following test procedures:
• Dimensional control
• Surface finish
• Measurement of the melt flow index
• Impact bending test
• Heat reversion test
• Homogeneity of the material
• Behavior under long period stressing |
| |
| External Control |
| |
External supervision consists of tests of a fixed scope and at fixed intervals. The external supervision consists of tests of the products and
a) Internal audit of Nagory's quality assurance system and test procedures
b) Calibration of the test equipment
c) Hygienic and toxology tests |
| |
| Storage / Packing / Dispatch |
| Upon successful release, the products are stored in suitable warehouses. Internal instructions control the method of packing, storage and dispatch of the products. The warehouses staff is responsible for control of the stored product. |
