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Quality control

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.

Inspection objectives

Monitoring and supervision of the inspection, evaluation, and certification of products, production process, and loading and transportation conditions.
Confirmation of the completeness and accuracy of compliance with the requirements of factory process instructions, orders (specifications), standards, and technical specifications.

Quality control stages

Start of the production cycle

Inspection of the production process (in-process inspection)

1
Performed at each process operation through visual and measurement inspections by plant staff. In addition, plant staff carry out random inspections of process parameters.
Automated inspection equipment is installed in the Vysota 239 turbo-electric arc welding shop to automatically check the wall thickness of sheets, geometrical parameters of pipes, and the width and height of welds.
Inspection of the production process (in-process inspection) in-process inspection

Acceptance of end products (acceptance inspection, qualification)

2
Performed by technical inspection plant staff. The inner and outer surfaces of every pipe are subject to detailed inspection in addition to checking the final geometry of pipes for compliance with regulatory documents (RD).
If necessary, non-destructive testing (ultrasonic, x-ray, magnetic particle, capillary) is also carried out.
Acceptance of end products (acceptance inspection, qualification) acceptance inspection

Inspection assessment

3
Assessing the compliance with regulatory requirements is the responsibility of the process engineers of manufacturing plants, personnel from the technical inspection plant, and specialists of the process technology department and new products department.
All pipes shipped to our customers have passed the acceptance procedure and have the appropriate quality certificates.
Inspection assessment Inspection assessment
Shipment of finished products

What do quality inspections cover?

All regulatory documents (state standards (GOSTs), specifications) require certain types of pipe inspection
In accordance with the requirements of regulatory documentation, the chemical composition, mechanical, technological properties of pipes, SDT and TPA and other parameters are subjected to control.
Visual inspection of inner pipe surfaces
Instrument inspection of surfaces
Wall thickness inspection
Inspection of outside diameter
Pipe curvature inspection
Inspection of the bevel end face ring (root face)
Bevel angle inspection
Pipe length measurement
Steel grade inspection

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

Inspection methods:
- Positive material identification;
- Chemical or spectrum analysis.

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