Quality is monitored throughout the product life cycle, from the arrival of materials to the manufacturing of finished products.
No defects are made, tolerated or transferred
All products manufactured at ChelPipe Group facilities are subject to several phases of inspection before shipment. Zero defect culture is the core element of the White Metallurgy Philosophy.
Quality control stages
Inspection of the production process (in-process inspection)1
Acceptance of end products (acceptance inspection, qualification)2
What do quality inspections cover?
Visual inspection of inner pipe surfaces
The visual inspection of inner pipe surfaces is a standard inspection method for general-purpose industrial pipes. It states that each pipe with a sufficiently large internal channel needs to be illuminated by an electric lamp or a reflector-type illumination from the opposite side of the inspector in order to carry out an effective inspection of the inner surface along the entire pipe length. The inspection is also carried out with the use of periscopes involving an increase of the surface area.
Instrument inspection of surfaces
Instrument inspection is used to assess the quality of outer and inner pipe surfaces in accordance with the regulatory documents or in consultation with the customer. This inspection type is carried out using ultrasonic testing equipment
Wall thickness inspection
Wall thickness is examined at both ends of the pipe by the class II accuracy MT pipe-type micrometer, or by a spring press-type indicator. The measurements are made at several diametrically opposite points. Ultrasonic devices are used for the instrumental examination of pipe wall thickness.
Inspection of outside diameter
The outside diameter is examined manually by a class II accuracy MK plain micrometer or by calibrated staples in at least two cross section points. At least two measurements are made in mutually perpendicular planes in each cross section point. Pipes for critical applications are subject to instrumental inspection, along with the examination of the surface continuity and wall thickness, using ultrasonic devices.
Pipe curvature inspection
Pipe curvature requirements are typically based on the production process. Subject to regulatory documents, the actual curvature is measured with a one meter long calibration line and a set of probes.
Inspection of the bevel end face ring (root face)
As required by the regulatory documents and carried out with a ruler or template.
Bevel angle inspection
As required by the regulatory documents and carried out with an angle gage or template.
Pipe length measurement
Carried out manually with rulers, tape measure, or automatically on a dedicated test-bench with incremental sensors.
Steel grade inspection
- Positive material identification;
- Chemical or spectrum analysis.