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Quality Certification Certified Translation from Chinese into English

Name：Water thermotube of the 7^th Company of CNPC（Ⅰ） Number：468

Checking items	Requirements of criterion	Checking results	conclusion
Ⅰ. Material
1. Steel tube and steel strip	Parent tube：steel tube20-φ32×3-GB/3087	Satisfactory	Accepted
	Steel strip 08Al ：16.2×1.2 16.2×1.0	Satisfactory	Accepted
	Certification of material quality	Effective	Accepted
2. Welding surface of parent tube and steel strip	No flaws and impurity that influence the quality of welding such as coverage, iron rust and recess.	Satisfactory	Accepted
Ⅱ.Braze welding of thermotube fin
1. Jointing of the starting point and the ending point of the fin	Fix with the manual welding method	Satisfactory	Accepted
2. rate of fin deposition	100%	Satisfactory	Accepted
3. Quality of no fin part	The flaw such as recess and under cut which is more than the negative deviation of the thickness of parent tube wall should be smoothed	Satisfactory	Accepted
Ⅲ. Deviation of thermotube configuration sizes
1.Total length	5075±5	5070±5	Accepted
2. Height requirements of fin	15	15±0.5	Accepted
3. Deviation of fin thread pitch	0.5/10	0.5/10	Accepted
4. Thermotube linearity	≤1.5mm/m	≤1.5mm/m	Accepted
5.Rake angle of fin tube	≤8°	≤8°	Accepted
6.End plate of thermotube	Be round off and no gas cavity and crack on the end plate	Satisfactory	Accepted
7. Diameter of weld point on top of end plate	≥8mm	≥8mm	Accepted
8. Height of weld point on top of end plate	≥3mm	≥3mm	Accepted
9. Welding position of caulking ring and tube body	The distance of the welding position and the heating section 2800±5。	2800±5	Accepted
10. Welding height of caulking ring and tube body	≥4mm	≥4mm	Accepted
11. Welding quality of caulking ring and tube body	No flaws such as gas cavity, crack and cinder inclusion.	Satisfactory	Accepted
Ⅳ. Performance of the thermotube
1.Listening check	Each product should be check after being finished. Shake the thermotube and the silvery voice should be heard.	Satisfactory	Accepted
2.Starting time	≥5min	≥5min	Accepted
3.Isothermal performance	The temperature difference of cooling section≤5℃	≤5℃	Accepted
Checker： Checking engineer： Date：2005/4/24

Quality Certification

Name：Naphthalin thermotube of the 7^th Company of CNPC（Ⅱ） Number：98

Checking items	Requirements of criterion	Checking results	conclusion
Ⅰ. Material
1. Steel tube and steel strip	Parent tube：steel tube20-φ32×3-GB/3087	Satisfactory	Accepted
	Steel strip 08Al ：16.2×1.2 16.2×1.0	Satisfactory	Accepted
	Certification of material quality	Effective	Accepted
2. Welding surface of parent tube and steel strip	No flaws and impurity that influence the quality of welding such as coverage, iron rust and recess.	Satisfactory	Accepted
Ⅱ.Braze welding of thermotube fin
1. Jointing of the starting point and the ending point of the fin	Fix with the manual welding method	Satisfactory	Accepted
2. rate of fin deposition	100%	Satisfactory	Accepted
3. Quality of no fin part	The flaw such as recess and under cut which is more than the negative deviation of the thickness of parent tube wall should be smoothed	Satisfactory	Accepted
Ⅲ. Deviation of thermotube configuration sizes
1.Total length	5075±5	5070±5	Accepted
2. Height requirements of fin	15	15±0.5	Accepted
3. Deviation of fin thread pitch	0.5/10	0.5/10	Accepted
4. Thermotube linearity	≤1.5mm/m	≤1.5mm/m	Accepted
5.Rake angle of fin tube	≤8°	≤8°	Accepted
6.End plate of thermotube	Be round off and no gas cavity and crack on the end plate	Satisfactory	Accepted
7. Diameter of weld point on top of end plate	≥8mm	≥8mm	Accepted
8. Height of weld point on top of end plate	≥3mm	≥3mm	Accepted
9. Welding position of caulking ring and tube body	The distance of the welding position and the heating section 2800±5。	2800±5	Accepted
10. Welding height of caulking ring and tube body	≥4mm	≥4mm	Accepted
11. Welding quality of caulking ring and tube body	No flaws such as gas cavity, crack and cinder inclusion.	Satisfactory	Accepted
Ⅳ. Performance of the thermotube
1.Listening check	Each product should be check after being finished. Shake the thermotube and the silvery voice should be heard.	Satisfactory	Accepted
2.Starting time	≥5min	≥5min	Accepted
3.Isothermal performance	The temperature difference of cooling section≤5℃	≤5℃	Accepted
Checker： Checking engineer： Date：2005/4/24

Quality Certification

Name：Water thermotube of the 7^th Company of CNPC（Ⅲ） Number：78

Checking items	Requirements of criterion	Checking results	conclusion
Ⅰ. Material
1. Steel tube and steel strip	Parent tube：steel tube ND-φ32×3-GB/3087	Satisfactory	Accepted
	Steel strip 08Al ：16.2×1.2 16.2×1.0	Satisfactory	Accepted
	Certification of material quality	Effective	Accepted
2. Welding surface of parent tube and steel strip	No flaws and impurity that influence the quality of welding such as coverage, iron rust and recess.	Satisfactory	Accepted
Ⅱ.Braze welding of thermotube fin
1. Jointing of the starting point and the ending point of the fin	Fix with the manual welding method	Satisfactory	Accepted
2. rate of fin deposition	100%	Satisfactory	Accepted
3. Quality of no fin part	The flaw such as recess and under cut which is more than the negative deviation of the thickness of parent tube wall should be smoothed	Satisfactory	Accepted
Ⅲ. Deviation of thermotube configuration sizes
1.Total length	5075±5	5070±5	Accepted
2. Height requirements of fin	15	15±0.5	Accepted
3. Deviation of fin thread pitch	0.5/10	0.5/10	Accepted
4. Thermotube linearity	≤1.5mm/m	≤1.5mm/m	Accepted
5.Rake angle of fin tube	≤8°	≤8°	Accepted
6.End plate of thermotube	Be round off and no gas cavity and crack on the end plate	Satisfactory	Accepted
7. Diameter of weld point on top of end plate	≥8mm	≥8mm	Accepted
8. Height of weld point on top of end plate	≥3mm	≥3mm	Accepted
9. Welding position of caulking ring and tube body	The distance of the welding position and the heating section 2800±5。	2800±5	Accepted
10. Welding height of caulking ring and tube body	≥4mm	≥4mm	Accepted
11. Welding quality of caulking ring and tube body	No flaws such as gas cavity, crack and cinder inclusion.	Satisfactory	Accepted
Ⅳ. Performance of the thermotube
1.Listening check	Each product should be check after being finished. Shake the thermotube and the silvery voice should be heard.	Satisfactory	Accepted
2.Starting time	≥5min	≥5min	Accepted
3.Isothermal performance	The temperature difference of cooling section≤5℃	≤5℃	Accepted
Checker： Checking engineer： Date：2005/4/24

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