Strict quality inspection for half couplings ordered by Iranian client
Haihao Group is committed to providing the highest quality products to our clients. Recently, we received an order for half couplings from our Iranian customer, who has specified rigorous quality inspection requirements before shipment. This commitment to quality assurance underscores the strength and reliability of Haihao Group in the pipeline industry.

Half Couplings
Customer’s Stringent Requirements
The half couplings, made from high-quality alloy steel, must meet the following critical specifications:
Hardness: The maximum hardness allowed for the couplings is 207 Brinell hardness (HB). This ensures that the couplings maintain their structural integrity under operational conditions.
Pressure Rating: The couplings must withstand a pressure of no less than 3000 lbs, guaranteeing their performance in high-pressure applications typical of the oil and gas industry.
Material Test Certificate (MTC): The customer requires a comprehensive MTC that includes:
Chemical Analysis: To confirm that the material composition meets the specified standards.
Mechanical Properties: Documenting the mechanical performance characteristics to ensure reliability.
Heat Treatment: The couplings must undergo normalizing and tempering processes to enhance their mechanical properties.
Ultrasonic Testing (UT) Report: A UT report is necessary to detect any internal defects that could compromise the integrity of the couplings.
Haihao Group’s Commitment to Quality
At Haihao Group, we take these requirements very seriously. Our production processes adhere to international standards, and we have implemented stringent quality control measures at every stage of manufacturing.
We understand that our products play a critical role in our customers’ operations, particularly in high-stakes environments like oil and gas extraction. Therefore, we ensure that our half couplings not only meet but exceed the stringent criteria set by our clients.
To meet these demands, our skilled technicians and engineers work diligently to ensure every product is manufactured and tested to the highest standards. The use of advanced testing methods, such as ultrasonic testing, alongside thorough chemical and mechanical analyses, reinforces our commitment to quality.
The stringent requirements set by our Iranian client for the half couplings highlight the importance of quality in the pipeline industry. Haihao Group’s dedication to fulfilling these demands not only demonstrates our capability but also reassures our clients of our commitment to excellence. We look forward to continuing to support our customers with high-quality products and unparalleled service. If you have any inquiries or require our products, please feel free to contact us.