The manufacturing process flow for boiler drums
The manufacturing process flow for boiler drums consists of the following steps, as the drum is composed of heads (tube sheets) and shell sections. The type of head varies for boilers with different parameters. Low-pressure boilers often use flat heads (also known as tube sheets) or oval heads, while medium-pressure boilers typically use oval heads, which can be further categorized into perforated and non-perforated types. The general manufacturing process includes the following procedures:
1. Head Manufacturing Process Flow:
– Material inspection and acceptance
– Marking (transfer of material inspection number)
– Gas cutting for material procurement
– Planing longitudinal weld bevels (if there is splicing)
– Splicing
– Welding
– Pressing (if applicable)
– Non-destructive testing (if there is splicing)
– Machining end faces
– Drilling holes
– Installing reinforcing rings for manholes
– Welding
– Machining manhole sealing surfaces
– Waiting for assembly
2. Shell Section Manufacturing Process Flow:
– Material inspection and acceptance
– Marking (transfer of material inspection number)
– Gas cutting for material procurement
– Planing longitudinal circumferential weld bevels
– Pre-bending
– Rolling
– Assembly and welding of longitudinal seams
– Installation of arc-starting plates, welding inspection samples (if required), and arc-ending plates
– Welding
– Non-destructive testing
– Mechanical property testing of welding inspection samples (if applicable)
– Welding
– Circularity correction
– Waiting for assembly
3. Boiler Drum Manufacturing Process Flow:
– Assembly and welding of the first head with its connecting shell sections and between shell sections
– Non-destructive testing
– Assembly and welding of the last head with the drum body
– Non-destructive testing
– Marking of hole positions
– Processing of pipe holes
– Welding of pipe seats and pipe joints
– Hydrostatic testing
– Welding of pipe joint bevels and processing of pipe holes
– Assembly of internal devices and manhole devices
– Painting and packaging
– Warehousing