Quality Control

Quality Control

    Customer comes first, for better service for clients, Tipvalve always adheres to quality as the core. We have strict quality control plan, reliable testing specifications and considerate after-sales service. Also received positive feedback and unanimous praise from customers.

    We own interior quality assurance system, implementing over all quality management in the whole process. Each valve has a heat number and a serial number to achieve traceability. All raw materials must carry on the material composition and mechanical performance review before entering the factory, to completely eradicate unqualified materials. Nondestructive testing for valve pipes is necessary before and during raw material processing. Valves should pass valve body strength test, hydraulic pressure seal test and gas seal test one by one before leaving factory. Besides, valves for specific application need more tests, such as RT, DPI, MT, UT, spectral analysis, PMI, low leakage test, high & low temperature cycle test, life test, fire test, extra-cryogenic test, microstructure test, all type mechanical properties test, deoiling skim cleanness test and so on, to guarantee all products are all qualified before delivery.

    Except internal severe work system and workflow, there are also the third party certification authority and customer approval to ensure quality. TIP has been passed ISO9001，CE-PED，API6D，API607 certified. We are still working on the improvement of quality control and management capacity.

Flow Chart

Quality Standard

ANSI/ASME	American National Standards Institute and American Society of Mechanical Engineers
B1.1	Unified Inch Screw Threads
B1.20.1	Pipe Threads, General Purpose
B16.5	Pipe Flanges and Flanged Fittings
B16.10	Face-to-Face and End-to-End Dimensions of Ferrous Valves
B16.11	Forged Steel Fittings, Socket-Welding and Threaded
B16.20	Ring-Joint Gaskets and Grooves for Steel Pipe Flanges
B16.20	Buttwelding Ends
B16.34	Valves – Flanged, Threaded, and Welding End
B16.5	Steel Pipe Flanges and Flanged Fittings
B18.2.1	Square and Hex Bolts and Screws Inch Series
B18.2.2	Square and Hex Nuts
B31.1	Power Piping
B31.3	Chemical Plant and Petroleum Refinery Piping
B31.11	Code for Pressure Piping – Slurry Transportation Piping Systems
ASME	American Society of Mechanical Engineers
Section V	Boiler and Pressure Vessel Code Nondestructive Examination
Section VIII Div. 1	Boiler and Pressure Vessel Code Rules for Construction of Pressure Vessels
ASTM	American Society for Testing and Materials
A275	Standard Practice for Magnetic Particle Examination of Steel Forgings
A370	Standard Test Methods and Definitions for Mechanical Testing of Steel Products
A388	Standard Practice for Ultrasonic Examination of Steel Forgings
A609	Standard Practice for Castings, Carbon, Low-Alloy, and Martensitic Stainless Steel, Ultrasonic Examination Thereof
E94	Standard Guide for Radiographic Examination
E165	Standard Practice for Liquid Penetrant Examination for General Industry
E709	Standard Guide for Magnetic Particle Testing
NACE	National Association of Corrosion Engineers
MR-01-03	Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments
SP-6	Standard Finishes for Contact Faces of Pipe Flanges and Connecting – End Flanges of Valves and Fittings
SP-25	Standard Marking System for Valves, Fittings, Flanges and Unions
SP-44	Steel Pipe Line Flanges
SP-45	Bypass and Drain Connections
SP-53	Quality standard for Steel Castings and Forgings for Valves, Flanges and Fittings and other Piping Components – Magnetic Particle Examination Method
SP-54	Quality standard for Steel Castings and Forgings for Valves, Flanges and Fittings and other Piping Components – Radiographic Examination Method
SP-55	Quality standard for Steel Castings and Forgings for Valves, Flanges and Fittings and other Piping Components – Visual Examination Method
SP-61	Pressure Testing of Steel Valves
SP-72	Ball Valves with Flanged or Butt-Welding Ends for General Service
SP-82	Valve Pressure Testing Methods
SP-84	Steel Valves – Socket Welding and Threaded Ends
SP-93	Quality standard for Steel Castings and Forgings for Valves, Flanges and Fittings and other Piping Components – Liquid Penetrant Examination Method
SP-94	Quality standard for Steel Castings and Forgings for Valves, Flanges and Fittings and other Piping Components – Ultrasonic Examination Method
API
598	Valve Inspection and Testing
608	Metal Ball Valves – Flanged, Threaded and Welding Ends