9.6　Furnace Body

Ⅰ　Dominant Items

9.6.1　In case of welding for furnace shell assembly，the WPQ shall be carried out with report，based on which the welding procedure and the operation instruction for welding shall be determined or prepared.

Quantity to be checked:100%.

Inspection method:Check WPQ report and the operation instruction for welding.

9.6.2　The internal quality of butt welds from the assembly of furnace shell shall comply with the requirement of the design technical document，or that of GradeⅢof weld quality grading criteria of Construction and Acceptance Code for Welding Work of Field Equipment and Industrial Pipeline（GB 50236）in case of no requirement in the above document.

Quantity to be checked:100%.

Inspection method:Check the ultrasonic or radiographic inspection records.

9.6.3　The appearance quality of butt welds in case of furnace body assembly shall meet the requirement of the design technical document，or that of Appendix E of the Code in case of no requirement in the above document.

Quantity to be checked:100%.

Inspection method:Observe，or check with a magnifier.

9.6.4　The postweld heat treatment of butt welds in case of furnace body assembly shall meet the requirement of the design technical document，or that of Appendix F of the Code in case of no requirement in the above document.

Quantity to be checked:100%.

Inspection method:Check the record of heat treatment.

9.6.5　The water cooled wall and water cooling tube system must be subject to hydrostatic test prior to building work according to the requirement of the design technical document.If no requirement in the document，the following requirements shall be complied with:booster its pressure to the test pressure which shall be 1.5 times of the working pressure and hold for 10min，and then lower it to the working pressure and hold for 30min，and finally check whether there is pressure fall or leakage.The test is qualified in case of no pressure fall or leakage.In case of flushing test，the water shall be able to flow in and out smoothly and freely for at least 24h，without any leakage.

Quantity to be checked:100%.

Inspection method:Observe，and check the records for pressure test and flushing test.

Ⅱ　General Items

9.6.6　The allowable deviation for assembly dimensions of furnace shell shall meet the requirement of the design technical document，or that in Table 9.6.6 in case of no requirement in the above document.

Quantity to be checked:100%.

Inspection method:See Table 9.6.6.

9.6.7　Allowable deviation for furnace shell installation shall comply with the requirements in Table 9.6.7.

Quantity to be checked:100%.

Inspection method:See Table 9.6.7.