6.3　Tuyere Device

Ⅰ　Dominant Items

6.3.1　The pressure test for large，medium and small holder with water cooler before installation shall meet the requirements in the design documents.And it shall meet the requirements in Appendix E of this standard when not specified.The water test shall be taken for cooling equipment and pipe after installation，the water inlet and outlet shall be unblocked and the joint shall have no leak at joint.

Check quantity:full check.

Check method:check the pressure test records and water test records.

6.3.2　The clearance between top plate and large holder shall meet the requirements in design documents when the tuyere device is fixed.It should not be less than 10mm when not specified.The sealing face between large holder and medium holder shall be checked with a 0.10mm feeler gauge and the inserting depth shall not be larger than 1/3 of the contact length.

Check quantity:full check.

Check method:check the installation quality records or check with a steel rule，feeler gauge.

6.3.3　The sealing face on spherical surface of tuyere device shall have no clearance larger than 0.05mm.

Check quantity:full check.

Check method:check the installation quality records or check with a feeler gauge.

6.3.4　The direct injection tube shall have no slot and other damage on the spherical surface before installation.

Check quantity:full check.

Check method:visual check.

Ⅱ　General Items

6.3.5　The welding quality of flanged short pipe under bustle pipe shall meet the requirements in the design documents.And it shall meet the requirements in GB 50236 Code for Construction and Acceptance of Field Equipment，Industrial Pipe Welding Engineering when not specified.

Check quantity:20% random check for short pipes and no less than 4 pieces.

Check method:check with a magnifier，welding seam gauge and steel rule.

6.3.6　The packing（backing）seal between flange faces of tuyere device shall meet the requirements in the design documents，they shall be closely contacted and the threading direction shall be uniform except for those due to structure.

Check quantity:20% random check for flanges and at least 4 pieces.

Check method:trial fastening with a wrench and take visual check.

6.3.7　The allowable installation deviation of tuyere device shall meet the requirements in Table 6.3.7.

Check quantity:random check for 4 groups.

Check method:see Table 6.3.7.