What is API 20E?

API-20E is a specification for manufacturing high-strength carbon and alloy steel bolts which are applied to critical Surface and Subsea equipments used in Oil and Gas industry. This specification from American Pertoleum Institute specifications applies stringent quality requirements though the complete manufacturing process which infuses reliability and safety into these fasteners. To certify a bolting to the API 20E specifications, qualifications and re-qualifications of the manufacturing process for these bolting is to be performed.

Three Bolting Specification Levels: API 20E BSL1, API 20E BSL2, API 20E BSL3

API 20E specification has further categorised the quality requirements of these fasteners into three bolting specification levels. Each bolting specification (BSL1, BSL2, BSL3) is unique due to the extent of quality controls that the bolting manufacturer has to establish. Such controls start right from stage of raw material purchase and goes upto the final inspection of the product. Based on the pressure and temperature requirements of the equipment to which these fasteners are being applied to, the level of bolting specification is selected.

What are API 20E Fasteners?

The API 20E bolting is designed to contain huge pressure and to bear the exposure to harsh unforgiving environment. These are categorised into 9 types (Bolting Type A to Bolting Type I). Based on the material used and various tests/ insections performed during the manufacturing of these fasteners, they are certified to a BSL of API-20E. Each piece of these fasteners comes with the mark of quality in the form of API monogram. This mark can be applied only when the manufacturer has receievd the licence to apply this monogram. The scope of API-20E licence is driven by capability of manufacturer to consistenetly meet the the BSL quality requirements for the 9 types of these fasteners, along with the method imployed to manufacture them.

 
NUBOTECK API 20E License

API 20E Licence #20E-0096

MyCerts @ API

NUBOTECK & the three BSLs of API 20E

NUBOTECK has the capability to fulfull all the requirements of all three bolting specification levels, and so have aquired the licence to apply API monogram to these products. This licence was initially attained in the year 2021. The scope of licence is now expanded to include the products made through hot-working (forging).

NUBOTECK boltings are manufactured under the below approved scope for all 3 BSLs

  • Studs: Machined Body with Machined or Rolled Threads
  • Nuts: Forged or Machined Body with Machined Threads
  • Bolt/Screws: Forged or Machined Body with Machined or Rolled Threads

Below controls have been established to ensure 100% conformance.

  • Quality Management System - API Q1
  • Steel Making Process - Melting, Casting, Hotwork Ratio
  • Material Testing - Cleanliness, Chemistry, Inclusion, Banding
  • Heat Treatment - Temperature Cycles, Equipment Calibration
  • Mechanical Testing - Hardness, Tensile, Yield, Elongation, Impact
  • Product Manufacuring - Hot Forming, Machining, Rolling, Tapping
  • Non-Destructive Examination - Volumetric, Surface
  • Dimensional Accuracy - Unified National Threads - ASME B1.1; Metric Threads - ASME B1.13M
  • Coating & Plating - Hydrogen embrittlement prevention

What are Grades of API 20E fasteners?

Grades of fastners are defined by ASTM specifications which govern the material used to produce these. API 20E further establishes control on production of raw material i.e. steel. Boltings from NUBOTECK comes with reliability and complete peace of mind. Huge emphasis is laid on the traceability of the material at each step. We provide all the test results on our test certificate as per EN 10204 3.1. Generally produced grades of API-20E are given here. The raw material used to manufacture these is procured from the sources meeting the qualificaton requirements of API 20E and API Q1

Grades for Studs/ Bolts/ Screws: External Threaded Bolting

  • ASTM A193 Grade B7, B7M
  • ASTM A320 Grade L7, L7M, L43

Grades for Nuts: Internal Threaded Bolting

  • ASTM A194 Grade 2H, 2HM, 7, 7M, 43
NUBOTECK Xylan Coated Stud

 

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