EASTLONG API 5CT 4-1/2 N80 CASING ADAPTOR FOR SEAMLESS CASING PIPE1

4-1/2"LC Casing Coupling

1,Type: 4-1/2"LC N80 CASING COUPLING

2,Grade: J55,K55,N80-1,N80-Q,L80-1,P110

3,Standard: API 5CT Spec 9^th Edition PSL-1,API5B Spec 15^th

4,Application scope : 4-1/2"LC Casing and tools top, the OD of casing and tools is 114.30mm

5,Main technical parameters and physical properties:

Table 1  Technical parameters(unit mm)

Table 2   Size and tolerance of threads of LC Casing Coupling (UNIT mm)

Table 3 Material mechanics performance requirements

Table 4  Material standard & chemical composition, mass fraction(%)

6,Manual instruction:

The ends of casing are connected with the couplings through the conical thread on their inner wall, by the way of parallel screwing of same threads and pitch. It can relieve the stress concentration of the single thread connection, and it’s hard to tired or broken with good connecting effect. It can effectively prevent tubing pipes from breaking off.

7,Production process:

Coupling bar stocks’ incoming inspection→ cutting → rough machining(Cylindrical turning )→ Inspection → Marking→ Finish machining(threading tuning)→ Inspection→ MT(Magnetic particle test)  → Phosphating→  Painting → Inspection→ warehouse entry

8,Inspection specifications:

     Totally inspect and test under the standards of API Q1, API5CT and API5B. Four level inspection are executed during each step of the whole process, including initial test, self inspection, cycling inspection and final inspection, to ensure the quality of each product meet the requirements of API 5CT and API 5B standards.

9,NDT - MT:

Meet the inspection of finished couplings of J55,K55,N80-1,N80-Q,L80-1,P110. Inspection of multi direction magnetic with wet fluorescence magnetic particle metho would be done on all finished threading couplings before surfacing treatment as per specifications of ASTME709, to check if there’s crack or defect on the inner and outer surface of the couplings.  

10,Surface treatment of phosphating:

    The inner and outer surface of couplings would be treated by phosphating. After then it can form a phosphating film insoluble in water, which makes the workpiece dark grey. This film can improve the  adhesion and wear resistance of products, preventing occlusion or scratching.  And it’s anticorrosion.

  Technology processing:Fixing → degreasing→ rinsing→ acid washing→ rinsing→ activating→ Manganese phosphide → Cold water washing→ Hot water washing→ Drying.

11,Marking:

    All products are makred with our brand name, API logo, production date (the last number of year and two numbers of month ), size and type, steel grade, heat number, and serial number (the height of letter is 1/4in).

12,Paintings:

Use paintings on the outer surface of each product. usually chose the following oil paints:nitroenamel(used in rainy day), acrylic resin (Alkyd blend paint) and so on. Colors include white, red, green.  Use red color on the whole body of couplings of L80-1 according to API5CT requirements, with a brown ring in the middle. ( the thickness of the film of painting ≥30μm).