Type 2 - Clevis/Clevis
The clevis by clevis style of swivel is the most common type and is the best for distributing side loads applied on the swivel due to its ability to pivot at either end. It does not allow the operator to push back without proper care and attention or the swivel may fold back on itself. Before rotation is recommenced, the line must be pulled straight or damage may occur to the swivel, as well as potential harm to nearby operators.
DCD recommends that some type of restrictor be used to prevent the swivel from pivoting at the front or reamer end. For swivels 00503-204 to 00503-215, the clevis is deeper at the leading end to allow the fool-proof design of a lug that would prevent more than minimal movement of the swivel away from the axis of rotation and also ensures the swivel is pulled in the right direction.
00503-202 to 00503-215
00503-220 to 00503-245
Type 3 - Flange/Lug
This style is specifically designed for directional drilling applications. It is intended to be mounted internally into a back reamer using a bolt flange. This type of swivel permits rotation of the drill pipe while protecting the utility from twisting.
Type 6 - Flange/Clevis
This style is intended to be mounted internally into a back reamer using a bolt flange. Hard surfacing is applied around the perimeter for extra durability. This type of swivel permits pushback without any fold-back possibility.
Type 7 - Clevis/Pin
Type 7 swivels offer a pin connection to the reamer or hole-opener ahead of the swivel. There are several different types and sizes of threaded connections (see chart for details). The rigid connection allows more straightforward pushback, but also places a greater side load on the swivel.
