Difference between API 5DP drill pipe and API 5D drill pipe

Item

API 5D Requirements vs. API 7 (Weld Area)

API 5DP Requirements

File Modification Required

1. Product classification

No grading

3 levels (PSL 1, PSL 2, PSL 3)

1. Raw materials

chemical composition

P ≤ 0.03%

S ≤ 0.03%

Class E: P 0.03%, S 0.03%; X, G and S: P 0.02%, S 0.015%

mechanical property

Pipe body (X, G and S) Impact work (21℃ ± 2.8℃) Akv avg. 54J, minimum Akv 47J for any sample; Welding area: impact work Akv avg. 16J, minimum Akv 13J for any sample;

Pipe (X, G and S) Impact work (21℃ ± 3℃) PSL 1: Akv avg. 54J, minimum Akv 47J for any sample; PSL 3: Akv avg. 100J, minimum Akv 80J for any sample; SR 19 (Class E) Impact work (21℃ ± 3℃) Akv avg. 54J, minimum Akv 47J for any sample; SR 20 (-10℃ ± 3℃): Akv avg. 41J, minimum Akv 30J for any sample; Welding zone: impact work PSL 1 (21℃ ± 3℃): Akv avg. 16J, minimum Akv 14J for any sample; PSL 3 (-20℃ ± 3℃): Akv avg. 42J, minimum Akv 32J for any sample; SR 20 (-10℃ ± 3℃): Akv avg. 16J, minimum Akv 14J for any sample; SR 24 (21℃ ± 3℃): Akv avg. 27J, minimum Akv 23J for any sample;

2. Inspection requirements

The finished drill shall thicken the end diameter with the minimum length of 100mm and the minimum diameter of d-3.2mm

none

Thening center: 1 outer surface, the total reading does not exceed 2.4mm; 2 inner surface, the total reading does not exceed 3.2mm

none

Thened ellipticity: the maximum ellipticity measured in the thickened outer diameter shall not exceed 2.4mm

none

3.test requirements document

lash (soldering seam)

1. If the specified requirements cannot be met, and no more than one sample is lower than the minimum absorption work requirement, reject the batch or re-test the three additional samples of a group taken from the same weld. All three specimens shall meet or exceed the average minimum absorption work requirements. If the material of the retest specimen obtained from the original specimen is insufficient, the specimen is allowed to be cut from another weld in the same batch.2. In the initial test, more than one sample is below the minimum work absorption work requirement, and the batch is rejected or retested from three welds in the same batch, with three samples for each weld

If a group of samples representing the batch is lower than the minimum average absorption work, or one sample is lower than the minimum absorption work, three additional samples shall be prepared from the same welding specimen. (The average and minimum absorption work of the retest sample shall be greater than or equal to the specified absorption work requirements.)

Full wall thickness and hardness (weld seam）

All weld specimens with average hardness values exceeding HRC37 shall be rerejected or the batch represented by the test. The test surface can be re-polished before re-testing.

Any welded specimen with hardness exceeds HRC37 shall be retested or rejected. The test surface can be repolished and retested.

Impact (pipe body)）

1. The specified requirements cannot be met, and no more than one sample Below the minimum absorption of work requirements, reject the batch or retest Taken from a set of three additional samples of the same single root at approximately the same location. All three specimens shall meet or exceed the average minimum absorption work requirements. 2. If more than one sample in the initial test is below the minimum absorption work requirement, reject the batch or take three samples for each of three tubes from the batch for retesting.

1.Requirements, three more samples can be retested from the same tube; all three samples should meet or exceed the average minimum absorption work requirements. 2. If the reinspection fails to meet the requirements, three samples should be drawn from each of the two tubes in the batch.

4. Other

External anticorrosion paint can protect the drill pipe for at least 3 months

none

The NDT personnel shall be trained according to ISO 11484 or ASNT SNT-TC-1A Appearance inspection personnel shall be trained and meet the company's requirements for vision and record the field illumination of 500 Lux

noe

The NDT personnel shall be trained according to ISO 11484 or ASNT SNT-TC-1A Appearance inspection personnel shall be trained and meet the company's requirements for vision and record the field illumination of 500 Lux

无