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TUSPIPE QUALITY CONTROL

TUSPIPE attaches great importance to pipe quality and meticulous control of product quality.

The QC team has 10 professional engineers who have extensive experience in industrial design, aerodynamics, and quality. And also, the company carries out continuous training for employees to strengthen their awareness of quality control, ensure that everyone operates according to the quality control process, and avoid the outflow of any unqualified products.

tUSPIPE laboratory

In order to maintain good pipe quality, TUSPIPE has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

The laboratory has passed the assessment of the China National Accreditation Committee for Conformity Assessment and successfully obtained the CNAS laboratory certification. The test results from the lab are recognized by 35 management system accreditation institutions and 54 laboratory accreditation institutions from other countries, which fully illustrated the authority of the inspection activities. So far, the company has successively obtained the qualification honors of “Enterprise Technology Center” and “Key Laboratory of Welded Steel Pipe”, and also the “Key Technology Research and Development Center” cultivated by Tianjin Municipality.

tuspipe QUALITY CONTROL Procedure

Supplier Management

TUSPIPE carries out a strict audit on suppliers, checking their production qualification and capacity to ensure that the quality control procedures of raw materials meet the requirements. In addition, the company also evaluates the suppliers every year and evaluates the past quality control, document control, delivery time, and other information to ensure that the suppliers meet our product quality requirements.

Before Production

After receiving the hot-rolled coil of raw materials, the quality assurance department sends an inspector for visual inspection, to eliminate cracks, pits, and other defects on the surface of the coil to affect the subsequent production. In addition to visual inspection, the inspection personnel also takes samples from the coil plate for chemical composition analysis and mechanical experiment according to the standard requirements, and compare the inspection results with the data on the material quality certificate issued by the coil plate supplier. If the analysis results do not meet the requirements of the standard, the raw material will be returned to the supplier for replacement.

During Production

In order to ensure that our steel pipes meet the standard requirements, the quality engineers, on-site inspection personnel and front-line production workers need to make great efforts. In the production process, we will carry out the following inspection and test on the steel pipe according to the standard requirements:

Tensile Test

A tensile test is a type of mechanical testing that measures the force required to pull on a pipe. The results of the test are used to determine the yield strength and elongation. To perform a tensile test, a sample is placed in a testing machine and pulled until it breaks. The machine measures the amount of force required to break the sample, as well as the amount of elongation (or stretching) that occurred before the break. By analyzing these results, engineers can determine whether a material is suitable for its intended application.

Metallographic Test

Metallographic tests are one of the important means of experimental research on metal materials. It is used to check the metallographic structure of the weld and heat affected zone and determine the internal defects. Through the analysis of metallographic structure, we can know the number, grain size, and microstructure of various micro oxides in the weld metal, so as to study the reasons for the advantages and disadvantages of the welding process and develop the heat treatment process parameters.

Charpy Impact Test

Charpy impact test is used to measure the notch resistance sensitivity (toughness) of metal materials. It is generally a test method to determine the safety, reliability and effectiveness of the product when it is subjected to external impact or action. The main assessment and determination of the product in its life may be subjected to a variety of shocks to adapt to the ability, that is, can work normally in the impact environment and maintain the integrity of the structure.

Chemical Component Analysis

Since each atom has its own characteristic spectral line, the spectrum can be used to identify substances and determine their chemical composition. This method is called spectral analysis. For spectral analysis, the emission spectrum or absorption spectrum can be used. This method has the advantage of being very sensitive and fast. When the content of an element in a substance reaches 10^ -10grams, its characteristic line can be found in the spectrum, and it can be detected.

Drop-Weight Tear Test

The Drop-weight Tear Test (DWTT) is a test item used to test the toughness of materials. It is mainly used to study the brittleness of metal materials at low temperatures. The goal is to establish the relationship between fracture morphology and temperature. This experiment is to use a drop hammer or pendulum at a certain height to break the sample in the state of a simply supported beam and evaluate the relevant performance results (such as the shear area fraction on the fracture surface of the sample).

Flattening Test

The flattening test is a test method used to test the deformation performance of a metal tube flattened to a specified size and to show its defects. In the flattening test, the sample is placed between two parallel plates, and the press, or other method, applies uniform pressure to the flattened distance (with the outer wall of the tube flattening, expressed in mm). Check the sample's bending deformation. If there is no crack, weld cracking, that qualifies.

Hydrostatic Test

The hydrostatic test, also known as the hydro test, is a kind of test that can effectively test the tightness of steel pipes. This test is used to assess the structural integrity of pressure-containing pipelines and other infrastructure. During the test, the pipe is filled with water and the water pressure is increased, maintained for a predetermined amount of time, and then released. The test is conducted at higher pressures than the pipeline's typical operating conditions.

shows-NDT-nondestructive-testing-cheking-any-defects-on-pipe-body

NDT Test

The non-destructive test, also known as the NDT test, refers to the detection of internal and surface defects of various engineering materials, parts, and structural parts by using changes in physical quantities such as heat, sound, light, electricity, and magnetism caused by internal structural abnormalities or defects in materials without damaging the object to be tested. Nondestructive testing is widely used in the detection of metal materials, such as pipes, plates, and coils.

Tensile Test

Metallographic Test

Charpy Impact Test

spectral analysis

DWTT

Flattening Test

Hydro Test

NDT Test

Coating, Marking, and Packaging

After the steel pipe production is completed, TUSPIPE performs the surface coating of the steel pipe according to the customer’s requirements, so as to prevent corrosion. Common coated with black paint, varnish, and anti-rust oil, these materials can play a temporary anti-rust effect in the process of transportation. If FBE, PE, or PP coatings are needed, the pipes will be transported and finished in a coating mill.
TUSPIPE sticks a bar code on the inner wall of each steel pipe, and the bar code is unique on each pipe. The bar code is equivalent to the ID card of each unit under the steel pipe, which records the heat number, tube number, steel grade, and production information of each pipe. After finishing the coating process, the production workers scan the bar code to obtain the corresponding product information and mark pipes according to the standard and contract requirements to ensure the traceability of the product.
Generally speaking, the packaging of products plays a crucial role in the protection of products during transportation, so the company is also very concerned about this process. According to the size, coating, and other processing information of steel pipe, the company usually uses end caps, PVC wrap, nylon sling, galvanized strip, fumigated wood, and other materials to protect the steel pipe. At the same time, the engineers can generate a customized packing scheme since some of our customers need more solid, stable, easy to unload packaging solutions.

Before Shipment

Before delivering to the customers, the inspector re-checks the appearance, packaging, marking label, tag, and other specifications of the steel pipe to ensure that the customer will not receive any defective products. After passing the inspection, the quality assurance department issues a mill test certificate according to each batch of shipped products.