China prefabrication of pipe spools manufacturer HEBEI HAIHAO strictly carry out rigorous quality control and products inspection to ensure continual quality prefabrication of pipe spools. As one of the leading manufacturers in China piping products filed ,Haihao always abide by the principle of “Quality First”.

Haihao Group is totally committed to innovative and updated quality testing procedures. Our group has consistently aimed to provide high quality, affordable piping products. We have established a complete quality control system to ensure the perfect operation for every workflow during production process.

We established long term relationships with many well-know steel raw material suppliers, which helps us to get the most competitive material to ensure our products competitive.

Quality Control Process  :


Haihao produce high quality prefabrication of pipe spools with the adoption of the most advanced technologies and equipments in the world now.

Inspection: With complete inspection facilities and high experienced inspector, we can execute dimensions checking, chemical analysis, mechanical testing, hardness testing, Positive Material Identification, NDT (including UT, MT,RT), and Hydro testing, etc, we can guarantee the quality as per different requirements from customer.

Quality Management: With the quality assurance systems as ISO9001-2008, Our company have been carrying out design, research and production in a correct way.

Raw materials control: Besides review of raw materials certificate from the supplier, we also carry out chemical and mechanical inspections for quality verification. We will purchase raw materials from our approved suppliers, if exceeds the range, the relevant qualification procedures must be approved by our quality department first.

Visual inspection in production: Appearance of products in every procedure shall be visual inspected. If there is any deformation or damage found , this product shall be rejected.

Traceability: From raw material to semi-finished products and finished products, good traceability records always are kept.
Random inspection for semi-finished products: In each procedure, the random inspection for semi-finished products shall be carried out.

NDT: MPI shall be applicable to each piece of fittings made by cold forming method. 100% RT shall be done on weld seam of welded products. Other NDE tests shall be as per clients’ demand and all NDT tests shall only be executed after heat treatment.

Dimensions : Sizes and angles for each product shall be inspected according to relevant standard tolerance ranges

Material grade verification: color coding shall be made full use of in this regard.

Storage & Delivery: Detailed storage and shipping plan shall be submitted to customers before delivery to ensure the package meet the requirements and delivery safely and quickly.

Third party inspection: we also accept any third party inspection appointed by our customers, such as Lloyd’s Register, BV, SGS, TUV, DNV and etc.

Haihao has get involved in the piping products field since 1982. With the experience more than 30years in production and operation, we are more competitive in this line. We can absolutely understand what you need and definitely meet your satisfaction .