Here you learn the complete step follow and testing done during a Field Joint Coating for Pipeline work.
यहां आपको #पाइपलाइन के काम के लिए #फील्ड #जॉइंट #कोटिंग के दौरान किए गए संपूर्ण चरण का पालन और परीक्षण मिलता है।
Equipment Required for Blasting work -
1. Air compressor with Moisture separator.
2. Copper Slag/ Sand Blasting with hose pipe connected Nozzle.
3. LPG Burner, Hose pipe and LPG Cylinders.
Measuring and Test Equipments :-
1. Peel Gauge Tester. (Weight Balance for weight check while removing of peel)
2. Pyrometer/ Infrared Temp. Gun. (For Measuring temp of pipe surface)
3. Holiday Detector. (For Coating Damage Check)
4. Hygrometer(For Relative Humidity Check)
5. Coat meter / Elcometer (For Coating Sleeve Thickness Measurement)
6. Wet film thickness gauge (For Primer Thickness Measurement)
7. Roughness profile measuring (Styled) instrument. (For Surface Roughness Comparison)
8. Press O Film (Thickness 50µm for roughness impression on it)
9. Digital Micrometer (For Roughness measurement printed on Press-O-Film)
Note - All measuring and test Equipment shall be calibrated.
This video contain all step follow during Field Joint Coating of Pipeline :
1.Chamfering of 3LPE Coating at angle 30° with horizontal, 3LPE coating from Factory was chamfered at site.
2. Checking of Relative Humidity with Hygrometer. As per standard relative humidity is less than 85 %.
3. Blasting of Welded exposed Metal surface with Nozzle and sweep blast- 100 mm sleeve
overlap area on 3LPE mill coating.
4. After Blasting check for surface roughness with Press-O-Film which is 50-70 micron as per standard specification..
5. Dust Contamination check with Tape (As per ISO-8502-3) maximum allow rating is 2.
6. Pre-heat the surface before applying the epoxy primer. Pre-heat Temperature 60-70 ℃.
7. application of Epoxy Primer
Mixed epoxy primer Part A : Part B in ration of 3:1 mixing duration is 30-60 Sec.
Primer application only on steel surface.
8. check the primer thickness with the Wet Film Thickness Gauge. Primer thickness is greater than 200 microns.
9.Apply HTLP-80 sleeve on wet primer in Centre of weld joint. Sleeve overlap is at 10 or 2 O'clock.
10. Application of Closure Patch with inner preheating and apply roller by pressing over it or all over the surface of sleeve.
11. Holiday test at 15 kv for 12.75 inch pipe Diameter.
Visual Inspection :
* Adhesive flow evident over the entire circumference on both edges.
* Coating Sleeve free from Air Entrapments & Air Voids.
* Sleeve Surface free from Bums & Punctures.
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8 янв 2022
