Quality Assurance

BENOSTON will satisfy customer requirements & expectations in a competitive manner through the consistent use and application of quality in our products, services and organization.

BENOSTON manufactures & remanufacture various components to a number of standards and specifications. All are made under the umbrella of an accredited quality system. A specific Quality plan is created to cover contracts where the client has special needs.

Quality System

Traceability BENOSTON has a threefold system to assure the history of components and assemblies can be traced from raw material to finished item. PART NUMBER: It gives the full engineering design history encapsulating drawings design calculations, specifications, and test procedures where applicable TRACE NUMBER: It gives the history of raw materials from cast house through forge or foundry to finished and tested forging or casting. A Heat number or heat treatment Log is maintained by Quality Dept.

SERIAL NUMBER: Enables the manufacturing history of the part to be traced. The number comes from the Manufacturing Works Order or Assembly Works Order.

Marking Data

Finished components and assemblies are stamped or etched with the relevant trace numbers. Only low stress marking equipment is used. Finished assemblies are tagged with the BENOSTON nameplate giving details as required by API.


The Engineering Dept shall allocate part numbers for all items. As soon as possible after order acceptance new items are allocated numbers and issued to Sales for inclusion in the sales order. Long lead items are given particular attention to enable purchase order placement.

Design of BENOSTON equipment is covered by a number or procedures. The engineering dept. will issue drawings, specifications, and procedures to all responsible Dept. Design verifications shall be done for any new components or design by review of alternative calculations and relevant test operations such as hydrostatic and functional tests.

Materials the Engineering Dept. creates material specifications giving the requirements of the relevant API standard. The specifications give details of the chemistry, mechanical properties, heat treatment, melting and processing details, hardness limits and NACE instructions for the material in question.


Inspection plans are available for the various equipment to be supplied. A plan is issued to cover PSL and equipment requirements. Each plan describes inspection steps as required by BENOSTON, API, and contract. Hold and witness points are indicated for BENOSTON, client, and third party.

All inspection equipment is identified and calibrated. All inspections are conducted with calibrated equipment. All non-destructive tests are conducted in accordance with written procedures.


Each assembly is done in accordance with instructions given on the work order. The work order includes test procedure. Assembly and Test procedures are issued by the Engineering Dept. with the bill of material.

An assembly record is created detailing major API components and trace numbers. Assembly hydro test are recorded on calibrated chart recorders. Records are kept of each assembly and a report is kept on file for reference.

Certification Document packages are constructed from the assembly test records. All equipment is provided with a certificate of conformity to the appropriate standards and specifications. Certificates shall be supplied of all tests as required by API standards.


Records are kept of all inspections and tests. Records are kept of all design reviews. Records are kept for five years after completion of the contract.

  • ISO 45001
    ISO 14001
    ISO 9001
    API 6A
    API Q1

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Benoston Machinery Co., Ltd. is a manufacturing company specialized in manufacturing wellhead equipment and valves. We are very interested in OEM manufacturing. We employ over 50 experienced staffs in...

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