80
5) The welding height can’t be lower than the surface of the parent metal. There should be
no crack and poor welding at the welding seam and the heat-affected zone. There
should be no slag inclusion, crater and pore at the welding zone.
6) Distance of two neighboring butt-jointed seams should be no less than the external di-
ameter of the pipe and can’t be less than 180mm. No butt-joint seam is allowed at the
elbow. The welding seam should keep a distance of at least the external diameter of the
pipe from the elbow and can’t be less than 100mm. No branch pipe is allowed to be
welded at the elbow and welding seam. The hanger and bracket should keep a distance
of at least 80mm with the welding seam.
7) Reinforced Height
h(mm)
Surface of the welding seam should be cleaned and be visually inspected. Quality of
the welding seam should meet requirements listed the table below.
Table 5.5.2 Reinforced Height and Width of the Welding Seam
Welding
Seam
Pipe Thickness (mm)
2～3 4～6 7～8
Without
grooves
Reinforced
Height
h(mm)
1～1.5 1.5～2
-
Width
b(mm)
5～6 7～9
-
With grooves
Reinforced
Height
h(mm)
-
1.5～2
2
Width
b(mm)
About 2mm over the groove
(3)Flange Connection
1) The flange should keep vertical with the center line of the pipe. Flange screws should
have the same length and same direction. Length of the bolt out of the nut should be a
half of the diameter of the bolt
2) Flange screws should be fastened along the diagonal to form an even seam.
3) The flange is not allowed to be directly welded to the elbow but used for the straight pipe
at least 100mm long.
A Series Modular-type Air-cooled (Heat Pump) Chiller
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