Performing The Butt Welding; Facing The Pipe Butts; Checking Pipe Alignment And Determining Drag Pressure - omisa SPG 2.0 Manual De Instrucciones

a list in which the applicable conditions can be selected by pressing
ñ or ò and confirmed by pressing the START/SET key.
4.4

Performing the Butt Welding

After all traceability data enabled in the configuration menu were
entered, Display 3 shows on the screen. From this screen, the welding
process proper is started by pressing the START/SET key.
First, the parameters of the pipes to be welded have to be entered.
If pipe parameters of an earlier welding are available and no code
error was detected, all welding parameters of the previous welding
are proposed and can be confirmed in one go (see Display 18).
From this display, it is possible to change the pipe parameters by
pressing the STOP/RESET key. Then the first thing is to select the pipe
material in a list; use the ñ and ò cursor keys and confirm by pressing
the START/SET key (see Display 16). Then the cursor keys (see the first
info in Sect. 4.1) allow entering the diameter and the wall thickness,
both confirmed by the START/SET key (see Display 17). Instead of the
wall thickness, you may want to enter the Standard Dimension Ratio
(SDR); then display this input line instead of the wall thickness line
by pressing the ï and ð simultaneously and enter the SDR value. The
machine then displays the whole set of parameters as an overview. In
case there are errors, it is possible either to enter all data once more
by pressing the STOP/RESET key, or to return to the previous step by
pressing ñ and correct the data one at a time.
If pipe codes were entered previously in the traceability data for the
joint, the machine automatically presents the welding parameters
contained in the pipe codes for confirmation.

4.4.1 Facing the Pipe Butts

To ensure that the pipe butts are level, insert the pipe facing tool
between the machine carriages and turn it on. Then have the pipes
close in on the facing tool and work them until a continuous shaving
blade is cut that rolls twice or three times around the pipe ends, so
the butts are level. Facing is stopped by moving the carriage apart.
Now press the START/SET key as a confirmation that facing is properly
finished, to make the report generator go on to the next process step
(see Display 20). By pressing STOP/RESET you return to the beginning
of the welding process. It is thus possible, too, if the butts are still
not level, to start over and repeat the facing process. When facing is
properly done, pipe alignment has to be checked.

4.4.2 Checking Pipe Alignment and Determining Drag Pressure

When the pipes are properly faced, close in the movable carriage
completely to check whether a potential vertical and horizontal pipe
misalignment is within the tolerance allowed by the applicable weld-
ing standard. The maximum acceptable gap between them is displayed
(see Display 20). If pipe alignment is in order, confirm this by pressing
the START/SET key. If the misalignment is out of tolerance, the pipes
may have to be readjusted in the clamps and facing may have to be
repeated.
When pipe alignment is appropriate, move the movable carriage apart
in order to determine the drag pressure, i. e. the minimum pressure
needed to "drag" the movable carriage on. When there is zero pres-
sure in the hydraulic circuit, slowly increase the pressure and watch
14
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SPG 2.0 User's Manual
O . M . I . S . A . S r l
Via Verga 9/11
20845 Sovico (MB), Italy
Weather
>sunny
clear
rain
Display 15
*Select Pipe Mater.*
>PE100
PE-HD
PP
Display 16
** Enter Pipe Size**
Pipe Diameter:0250mm
Wallthickness:22.7mm
Display 17
PE100
Pipe Diameter:0250mm
Wallthickness:22.7mm
RESET SDR11.0 SET
Display 18
Face Pipe Ends
230°C ACT. 0.5bar
Display 19
Check Pipe Alignment
Max. Al. Gap :2.5mm
230°C ACT. 3.5bar
Display 20
Version June 2020