Mechanical external pipe cutters Type RN


Application

The STS are designed for cutting tubing, casing or drill pipes into the well and retrieving them during workover operations. 

Construction

The External Cutters consist of a tubular body connected to the guide with metric threads designed for catching a «head» of the pipe to be cut into the cutters. Five knives are mounted with pint joints into special slots of the body. The External Cutters have a special device inside the body to actuate the cutters including the spring lock, the bearing, the control bushing, the feeding bushing and the spring. During downward travel the feeding bushing is secured with two shear pins.

When ordering, please specify:

  • Assembly name and nominal size;
  • Version (LH or RH);
  • Type of connecting thread of the top sub if other than stated in the table;

It is recommended to order:

  • Knife - 15 pcs. (3 sets);
  • Pin joint - 15 pcs. (3 sets);
  • Shear pin - 10 pcs. (5 sets);
  • Feeding bushing – 2 pcs.
Assembly name and size Diameter of cut pipes Body OD ID Connecting thread
мм inch мм inch мм inch
RN-42 33…42 1 5/16…1 17/32 78,5 3 3/32 53 2 3/32 ВНКТ – 60 upset tubing 2 3/8
RN-50 48…52 1 7/8…2 1/16 91 3 19/32 69 2 23/32 ВНКТ – 73 upset tubing 2 7/8
RN-60 60…63,5 2 3/8…2 1/2 114,3 4 1/2 79,4 3 1/8 ВНКТ – 89 upset tubing 3 1/2
RN-73 48, 60, 73 1 7/8; 2 3/8; 2 7/8 119,5 4 11/16 98,3 3 7/8 ВНКТ – 102 upset tubing 4
RN-89 73…89 2 7/8…3 1/2 139,7 5 1/2 110 4 11/32 ВНКТ – 114 upset tubing 4 1/2
RN-102 89…102 3 1/2…4 150 5 29/32 123 4 27/32 ОБС-140 API Casing 5 1/2
RN-114 102…114 4…4 1/2 180 7 3/32 149 5 7/8 ОБС-168 API Casing 6 5/8
RN-127 114…127 4 1/2…5 190 7 31/64 158 6 7/32 ОБС-178 API Casing 7
RN-140 127…140 5…5 1/2 206 8 1/8 174 6 55/64 ОБС-194 API Casing 7 5/8
RN-146 140…146 5 1/2…5 3/4 232 9 9/64 192 7 9/16 ОБС-219 API Casing 8 5/8

It is possible to produce any sizes not listed in the table



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