9. the following tests (scope of testing according to testing plan) come into question to guarantee the required weld seam quality:
a) Visual inspection of the weld seam preparation and the tack welds.
b) Checking that materials and filler metals have not been mixed up.
c) Checking the gases and auxiliaries used.
d) Sample testing check of the parameters during the welding work.
e) Non-destructive testing of the weld seams
10. In evaluating the weld seam the limit values set down for the relevant groups of demands are to be adhered to.
11. Only correctly marked and documented filler metals and consumables tested for their suitability in accordance with the relevant data sheets for filler metals may be used. The manufacturers’ instructions for handling and processing and the relevant welding instruction and/or welding process sheets must be followed and adhered to.
12. When welding high-alloy steels the inside of the tube is to be protected by gas (Argon or N2/H2).
13. The outer surface of the weld seam shall be polished with high-alloy steels directly after welding and before cooling.
14. The outer surface of the weld seam should be additionally pickled or polished and blasted with glass granulate respectively if applicable.
15. Weld seam preparation and wall thickness matching to specification. The welding areas must be metallically pure prior to welding.
16. weld seam shapes acc. To specification, drawing and/or industrial standard.
17. each weld seam must be durable identified by the welder making the seam with his personal welding symbol (by etching or stamping)
18. preheating and heat treatment:
a) Insofar as necessary preheating of the weld seams in accordance with the materials and tool geometries to be used.
b) Adhere to the interpass temperatures tin line with the materials to be processed
c) Cooling after welding in accordance with the materials and tool geometries to be used.
d) Insofar as necessary post-weld heat treatment of the weld seams in accordance with the materials and tool geometries to be used.
19. welding and heat treatment documentation:
a) Valid welder certificates.
b) Valid process test certificates.
c) Non-destructive test records.
d) Proof of preheating and heat treatments carried out.
e) Works certificates and authority approval for filler metals.

安装方法总则
General operating regulations
The operation of the plant must be carried out in accordance with the generally accepted rules of pipe work and vessel engineering. The relevant laws, rules, national and international codes as well as accident prevention regulations must be observed in all cases. Operation of the plant may be carried out only by qualified and properly trained special personnel.
Standard operating instructions:
1. Pay attention to admissible operating data (see rating plate, isometrics, detail and equipment drawings, documentation and specifications).
2. Operation only with completely functioning instrumentation, control equipment and safety engineering released by authority inspection.
3. Prior to starting up the melt line, the heat transfer installation has to be checked for proper condition.
4. Caution: during commissioning of heat carrier systems always start up the jacket line first of all (equal heating up of inner and outer tube to avoid constraints). Start up the product line only after the equal operating temperature has been reached at inner and outer pipe.
5. Caution: slow and continuous start-up of heating system during commissioning and after shut downs to avoid unallowable deformation and stress of melt line or equipment! Approx.2-3 days are necessary to heat up a standard melt line. A large melt line reaches its temperature stability after 4 or more days.
a) At first up to a constant temperature of 100-150 for min. 6-8 hours.
b) Then in periods of 1 hour by 10 up to max.200, hold this temperature for min.6-8 hours.
c) Then in periods of 1 hour by 10 up to max.300, hold this temperature for min.6-8 hours. (or up to specified working temperature if less than 300).
d) If the working temperature is higher than 300 final heating up in periods of 1 hour by 10 up to specified operation temperature.

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