This standard specifies the manufacture and inspection of smoke boxes and steel chimneys for industrial boilers. This standard covers the manufacture and inspection of smoke boxes and steel chimneys for industrial boilers within the scope of GB 1921 and GB 3166 (including those for industrial boilers with rated steam pressure or allowable working pressure less than 0.4 MPa). JB/T 1621-1993 Technical conditions for smoke boxes and steel chimneys for industrial boilers JB/T1621-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Industrial Boiler Smoke Boxes and Steel Smoke Window 1 Subject Content and Scope of Application
This standard specifies the manufacture and inspection of industrial boiler smoke boxes and steel smoke windows. JB/T1621-93
This standard is applicable to the manufacture and inspection of industrial boiler smoke boxes and steel smoke windows within the scope of GB1921 and GB3166 (also applicable to the manufacture and inspection of industrial boiler smoke boxes and steel smoke windows with rated steam pressure or allowable working pressure less than 0.4MPa). 2 Reference standards
Through holes for fasteners and rivets
Fasteners, countersunk holes for countersunk heads
Fasteners, countersunk holes for cylindrical heads
Fasteners, countersunk holes for hexagonal studs and hexagonal nutsGB152.4
GB1921Parameter series for industrial steam boilers
GB3166Parameter series for hot water boilers
JB/T1615Technical conditions for boiler paint and packaging3 Technical requirements
3.1The materials used to manufacture smoke boxes and steel smoke boxes (called smoke drawings, the same below) shall comply with the provisions of design drawings and relevant standards. 3.2The drilling holes on the wall panels of the smoke box and the connecting flanges of the smoke box shall comply with the provisions of GB152. 3.3The dimensional deviation △L of the length, width and depth L of the smoke box shall comply with the following provisions: When aL≤1m, △L shall not exceed ±5mm; when bL>1m, △L shall not exceed ±7mm. 3.4 The flatness of the smoke box wall panel should not be greater than 0.4% of the total length within any width. 3.5 The gap between the smoke box door panel and the smoke box frame should not be greater than 2mm. 3.6 When the smoke box is assembled, the parallelism between the horizontal center line of the smoke box and the horizontal center line of the boiler shell or the vertical center line of the smoke box and the vertical center line of the boiler shell should meet the following requirements:
a. When the length L is not greater than 1.5m, it should not be greater than 3mm; b. When the length L is greater than 1.5m, it should not be greater than 4mm. 3.7 The assembly displacement of the center line of the smoke box relative to the center line of the boiler shell or the reference line should not be greater than 5mm. 3.8 The diameter deviation of the smoke window should not exceed 3mm. 3.9 The straightness of the smoke box within each meter of length should not be greater than 3mm, and the straightness of the entire length of the cylinder section should meet the following requirements: a.
When the length of the cylinder section is not greater than 5m, it should not be greater than 8mm; when the length of the simple section is greater than 5m, it should not be greater than 10mm. 3.10 The assembly clearance between the smoke window body and the connecting flange shall not exceed 1.5mm. 3. 11
The end face inclination after welding between the smoke window body and the connecting flange shall not exceed 2.5mm. The weld surface of the smoke box and smoke should not have defects such as pores, cracks, and melt penetration. Approved by the Ministry of Machinery Industry of the People's Republic of China on June 1, 1993 and implemented on January 1, 1994
4 Painting, packaging and inspection
JB/T1621-93
4.1 The painting and packaging of smoke boxes and smoke windows shall comply with the provisions of JB/T1615. The inspection department shall inspect according to the drawings and the provisions of this technical condition. Those who pass the inspection shall be marked with a qualified mark. 4.2bzxz.net
Additional remarks:
This standard is proposed and managed by Shanghai Industrial Boiler Research Institute. This standard is drafted by Shanghai Industrial Boiler Research Institute. The main drafter of this standard is Qian Fenghua.
From the date of implementation of this standard, JB1621-83 shall be invalid.
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