6.4　Slag hole Device and taphole sleeve

Ⅰ　General Items

6.4.1　The pressure test for large，second，third and small holder at slag hole before installation shall meet the requirements in the design documents.And it shall meet the requirements in Appendix E when not specified.The water test shall be taken under work pressure 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 pressure test records and take visual check.

6.4.2　The clearance between top plate and slag flange shall meet the requirements in design documents when the large，second，third and small holder are fixed.It should not be less than 10mm when not specified.The sealing face between large holder and second holder，third holder，small holder shall be checked with a 0.10mm feeler gauge and the inserting depth shall not be more than 1/3 of the contact length.

Check quantity:full check.

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

6.4.3　When the slag flange and taphole sleeve are welded，the welding point shall be firm，reliable with full weld metal and no omission.

Check quantity:full check.

Check method:visual check.

6.4.4　The allowable installation deviation of slag hole device and taphole sleeve shall meet the requirements in Table 6.4.4.

Check quantity:random check respectively for 1 slag hole，iron notch.

Check method:see Table 6.4.4.

Table 6.4.4　Allowable installation deviation of slag hole device and taphole sleeve（mm）