Mathey Dearman CGM Cold Cutting System - Manual (Page 25)

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10 USE CONDITION
10.1 - PROVIDED USE CONDITION
The CGM Pipe Cold Cutting and Beveling Machine are designed to cut 8” (203 mm.) and larger metal pipes.
Special Wheels are required for 6” Pipe.
A. CGM-1 is designed to cut any round pipe having a smooth external surface. The machine should not be
used to cut spiral wound pipe.
B. To avoid overloading of the Chain, do not install the Guide Track and the Drive Chain on heavy crushed
pipe or on seam or spiral welded pipe.
C. The machine can prepare the pipe that will be welded in almost any type of environment.
D. Requires a Pneumatic or Hydraulic Power Supply and Hose Connections that meet the requirements
previously mentioned in this text.
E. The Hydraulic Drive Machine can operate at blade bevel angles up to 45 degrees depending on pipe tensile
strength. Through the use of Special Beveling Cutters, it is possible to make nonstandard standard bevel
angles for special welding process.
F. 30

or 37, 5

Angle Bevel Cutters are available for the customer’s welding application. Special Bevel
Cutters for “U” or “J” Bevels are available on request.
G. Use the right chain length, Center and Beveling Cutters at the appropriate wheel position. In case of doubt
refer to Table 1.
H. The CGM must always be used with both Beveling Cutters. The machine should never be used with only a
single Beveling Cutter.
I. A Guide Track must be used when cutting larger pipes or when operating in oblique position angles to 10
Degrees. This is to avoid the slipping of the machine on the pipe due to gravity.
J. A Guide Strip is required for high precision cutting or a multiple pass cutting. To accurately tension the
chain on the pipe a pass should be made around the pipe, before attempting the cutting process.
10.2 - USE NOT ALLOWED
A. The machine should not be used to cut through any obstacles around the circumference on the pipe or to cut
damaged pipe.
B. Never operate the machine with the cutters in reverse position. Improper use will result in damage to the
Blades and possible injury to the operator.
C. Do not operate the machine in clockwise rotation around the pipe except to relieve a cutter blockage.
D. The Cutters run in clockwise rotation, the machine must rotate in counterclockwise rotation around the pipe.
E. The Hydraulic CGM-1 is designed for underwater applications. The Pneumatic Machine should not be used
for underwater applications.
11.0 - CONFORMITY OF THE MACHINE

AIR MOTOR DRIVE VERSION - The machine has been designed and made in accordance with the
regulations now in force and in respect to safety. The machine is designed and built to the following
regulations:
CEE 89/392 Machine Regulations.
EN 292-2 Standardized Rule on use of the Machines.
Dig. 475 Italian Machine Regulations.
CEE 89/656 Use of the Individual protection device.
WARNING: The machine exceeds the noise limits stated on Regulation 79/113. The noise is created by exhaust of
the powerful air motors necessary to accomplish the cutting process. Additional noise is created by the echo
produced by the pipeline as it simulates a reverberation box. When the Pneumatic CGM-1 is in operation, noise test
measurements show a noise level of around 90 dB, while under cutting stress, it could exceed 100 dB.
ALL NECESSARY HEARING PROTECTION DEVICES MUST
BE WORN WHILE THE MACHINE IS IN OPERATION.