This inspection program covers the normal fabrication operations of:-
- Mitered elbows
- Reducers
- Tees-Wyes-Nozzles
- Flange pipe studs and flanges.
Checking the properties of these products during fabrication operations is under the responsibility of Q.C. Fitting inspector:-
General Inspection
This table shows the general testing requirements of the above mentioned fittings. The tests are done to all the fittings.
Property |
Test Method |
Before fabrication starts |
|
1. |
Pipe inspection prior to fabrication |
Q.C. summary visual record and status of on hold pipes. |
|
2. |
Pipe spigot outside diameter |
PI tape. |
|
3. |
Pipe length |
Steel tape |
Final Inspection |
|
1 |
Internal lay-up length |
Steel tape |
|
2. |
External lay-up bond length |
Steel tape |
|
3. |
Barcol hardness |
QW 13 |
|
4. |
Marking |
Visual |
|
5. |
Internal grooving at end of layup |
Visual |
|
6. |
Grinding/cleaning of the layup area |
Visual |
The following tables show the additional testing requirements for each of the fittings.
All the fittings are made from pipes which have been tested according to pipe test methods. The tests mentioned below are carried out during production of the fittings. Final inspection of the fittings must also meet the requirements in the visual standards. Marking of the fittings must follow the standard marking for each fitting to ensure a complete identification of each fitting.
Property |
Test Frequency |
Test Method |
Elbows |
|
1. |
Miter length |
Each pipe section before layup. |
Steel tape |
|
2. |
Gap between elbow sections |
Each joint before layup |
Steel tape |
|
3. |
Angle of elbow |
Each elbow before lay-up |
Angle measuring device. |
|
4. |
Total laying length |
Each elbow before layup. |
Steel tape. |
|
5. |
Alignment of layup |
2 points, 180 Deg. apart, each joint. |
Steel tape/visual. |
|
6. |
Visual (inside/ outside) |
Each elbow after final repair |
Visually |
Reducers |
|
1. |
Reducer section length |
Each section |
Steel tape |
|
2. |
Gap at joint |
Each joint before layup |
Steel tape. |
|
3. |
Section alignment after assembly |
Each joint before layup |
Water level/steel tape. |
|
4. |
Length of pipe |
Each section |
Steel tape |
|
5. |
Visual (Inside/ outside). |
Each reducer after repair |
Visually |
Tees,Wyes, Nozzles |
|
1. |
Length of header |
Pipe section before cutting |
Steel tape |
|
2. |
Length of branch |
pipe section after assembly |
Steel tape |
|
3. |
Position of branch |
Header pipe after cutting and assembly |
Steel tape. |
|
4. |
Angle between header and branch |
Each angle before lay-up. |
Angle measuring device |
|
5. |
Gap between header and branch |
Each header/branch joint. |
Steel tape. |
|
6. |
Visual inside/outside |
Each after final repair |
Visually |
Property |
Test Frequency |
Test Method |
Flanges |
|
1. |
Pipe length |
Each pipe section used for flange fabrication |
Steel tape |
|
2. |
Concentricity of pipe stud in mold |
Each pipe after being fixed on mold. |
Steel tape |
|
3. |
Grinding of pipe exterior at flange end |
Each pipe section |
visual |
After Flange lay-up.
|
4. |
Flange outside dia. |
Each flange after repair |
PI-Tape |
|
5. |
Flange thickness |
Each flange |
Caliper. |
|
6. |
Hub reinforcement length |
Each flange with dia. >= 350mm. |
Steel tape. |
|
7. |
Hub reinforcement thickness |
Each flange with dia. >= 350mm |
PI-Tape |
|
8. |
Groove depth and width |
Each Groove flange. |
Caliper |
|
9. |
Visual inspection |
|
|
|
10. |
Bolt circle diameter |
Each flange |
Steel Tape |
|
11. |
No. of bolt holes |
Each Flange |
- |
|
12. |
Bolt hole diameter |
Each flange |
Caliper |
|
13. |
Spot face diameter |
Each flange |
Caliper |
|
14. |
Hole spacing |
Each flange |
Caliper |
|
15. |
Flange squareness |
Each flange |
Level |
|
16. |
Gasket groove dia. |
Each flange |
Steel tape |
