AMERICAN PETROLEUM INSTITUTE GRADING:
Inspection guidelines for drilling tubing follow TH Hill Ds1 instruction in grading and inspecting tubing. Methods of inspection are categorized into 5 sections. Number from Category 1 (Least Methods) to Category 5 (Most Methods)
TH Hill DS 1 Category 1 - 5 Inspection |
|
Method No. |
Description |
01 |
Visual Pipe Inspection |
02 |
OD Inspection |
03 |
UT wall thickness measurement |
04 |
EMI with Longitudinal field (Transverse flaw detection by Spectagraph-2000) |
05 |
EMI with Longitudinal field and Gamma ray wall thickness measurement (Scanalog-100 + Scanawall) |
06 |
MPI Slip/ Upset using active field AC Yoke Dry MPI |
07 |
UT Slip/ Upset inspection |
08 |
Elevator Grooves inspection |
09 |
Visual Connection |
10 |
Dimensional inspection of Box OD, Pin ID, shoulder width, tong space and Box counter bore. |
11 |
Method no.10 plus Pin lead, counter bore depth, pin flat length, bevel diameter, seal width and shoulder flatness. |
12 |
Dimensional inspection of Box OD, Pin ID, pin lead, bevel dia, pin stress relief diameter and width, boreback cylinder dia and thread length and HWDP center upset diameter. |
13 |
Black light inspection with Fluorescent wet MPI using active DC current. |
14 |
UT connection |
15 |
Liquid Penetrant Inspection |
|
CATEGORY WISE INSPECTION PROGRAMME |
Product |
Category-1 |
Category-2 |
Category-3 |
Category-4 |
Category-5 |
Toll Joint |
Method 9 |
Method 9, 10 |
Method 9, 10 |
Method 9, 11 |
Method 9, 11, 13 |
Drill Pipes |
Method 1 |
Method 1, 2, 3 |
Method 1, 2, 3, 4 |
Method 1, 2, 3, 4, 6 |
Method 1, 2, 4, 5, 6, 7 |
Drill Collar |
Method 8, 9 |
Method 8, 9, 13 |
Method 8, 9, 12, 13 |
Method 8, 9, 12, 13 |
Method 8, 9, 12, 13 |
HWDP |
Method 1 |
Method 1 |
Method 1, 6 |
Method 1, 6 |
Method 1, 6 |
|
AMERICAN PETROLEUM INSTITUTE GRADING:
Inspection guidelines for production follow API 5CT instruction in grading and inspecting tubing. Although this system is theoretically voluntary, the American Petroleum Institute Grading System (API) is by far the most accepted method of separating tubular inventories by condition. This system consists of painted, colored bands placed at the ends of each joint of tube or casing.
Note: Color grading is subject to +/- according to customer preference.
GRADING SYSTEM
Used Tubing/Casing New Tubing/Casing (and Plain End Drill Pipe)
Used Drill Pipe
*Yellow Band: 0-15% body wall reduction (85% min. remaining)
*Blue Band: 16-30% body wall reduction (70% min. remaining)
*Green Band: 31-50% body wall reduction (50% min. remaining)
*Red Band: 50%+ body wall reduction (>50% remaining)