Read the clause first: a girth welded after erection is AGW-I or AGW-II, an LNG or LPG vertical seam is EGW, and cans welded in the shop then hauled to site are an HGZ or HGK rotator job. Process figures stay in the project specification.
Four example pairs: 600-2,800 mm at 8 t is HGZ-10, 1,200-4,600 mm at 40 t is HGZ-50, 1,800-5,500 mm at 80 t is HGZ-100, and 500-4,000 mm fits no single band. Both diameters and the weight have to sit inside one band.
Three envelopes are the confirmation: LH-3030 at 3 x 3 m, LH-8080 at 8 x 8 m, LH-80150 at 8 x 15 m. Head mount, rail past 8 x 15 m, and the power source stay on the drawing. A boom does not turn the shell.
HBJ-06, HBJ-12 and HBJ-50 tilt a flange, fitting or short assembly at 600 kg, 1.2 t and 5 t; HB-10/30/50 are flat tables at 1, 3 and 5 t. A pipe that turns as a cylinder is an HGZ or HGK set, and that is a second enquiry.
1 driven + 1 idle + 2 hydraulic fit-up stands, hydraulic lift and travel on rails, 0.1-1.2 m/min, diameter reference 1.5-6 m. Capacity is written on the project drawing – an HGZ or HGK tonnage is not the fit-up capacity.
Size to the heaviest course: HGZ-50 to 50 t at 800-5,000 mm, HGZ-100 to 100 t at 1,000-6,000 mm, HGK-200 to 200 t with the diameter on the drawing. The tonnage is the whole set, and extra idle stations do not raise it.
The confirmed system is 1 driven stand, 1 idle stand and 2 hydraulic fit-up stands on rails, 0.1-1.2 m/min, diameter reference 1.5-6 m. Capacity is stated on the project drawing – do not copy an HGZ or HGK tonnage onto the fit-up line.
Shortlist Wuxi ABK for hydraulic fit-up: 1 driven + 1 idle + 2 hydraulic stands, 0.1–1.2 m/min, Ø 1.5–6 m reference. Capacity is on the project drawing. An HGZ or HGK tonnage is not a fit-up rating.
If a welding cell placed on the EU market has a data connection, ask how it meets the Cyber Resilience Act, whose main obligations apply from 11 December 2027. Pendant-only rotators raise far fewer questions. List interfaces, remote access, and update policy in the freeze pack.
Write the destination motor efficiency class or exemption and the drive data into the RFQ. Rotator motors are small next to the welding power source — a compliance line, not a TCO driver. Efficiency class does not fix a wrong Hertz.
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