Henan Dongfanglong Machine Manufacture Co., Ltd can provide various Seamless tubing and casing couplings, pup joints and crossover from 1.9”-20” in grade H40, J55,K55,N80,L80,C95,P110 etc. The thread threads of EUE, NUE, BTC,LTC,STC. According to the strength of steel casing can be divided into different steel grade, deep well, using different steel grade. In corrosive environment also requires the casing itself has corrosion resistance. In the complicated geologic condition place also asked the casing having a anti-collapse performance.

Casing Specifications:

Materials: H40, J55, K55, N80-1, N80-Q, L80-1,L80-9Cr, L80-13Cr, C95,P110, Q125 etc.;
Executive standards: API 5CT, ISO,
Thread connection: STC,LTC,BTC, VAM,VAM TOP,NEW VAM;

Tubing-OCTG is made to withstand the pressure generated from the extraction process. Tubing is manufactured in the same way as casing, except that an additional process known as "upsetting" is applied to thicken the pipes.

Specifications:
Range: OD 42.16mm-114.3mm  Wall Thickness:3.56-16mm;
Materials: H40, J55, K55, N80-1, N80-Q, L80-1,L80-9Cr, L80-13Cr, P110, Q125 etc.;
Executive standards: API 5CT, ISO
Thread connection: NU, EU,IJ, VAM,VAM TOP,NEW VAM;
Length: R1(6.10-7.32), R2(8.53-9.75), R3(11.58-12.80);

OCTG Pup Joint for Casing & Tubing
Characteristic:
Standard: API 5CT/ISO11960/
Grade: H40, J55, K55, N80-1, N80-Q, L80-1,L80-9Cr, L80-13Cr, P110, C95,Q125;
Length: 2ft,3ft,4ft,6ft,8ft,10ft,12ft(with other length available upon request);
OD of Tubing joint: from 2 3/8” to 4 1/2”.Pipe End: EUE/NUE;
OD of Casing joint: from 4 1/2” to 20”. Threads: BTC,LTC,STC;

OCTG Couplings for Casing & Tubing
Couplings are short lengths of pipe used to connect with tubing or casing. They come with painted color codes on their external surface to indicate their steel grades. Couplings are manufactured according to API 5CT and 5B specifications.