Safely Using Drill Collar Clamps. North America Gas SPU - Wells. Introduction.
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North America Gas SPU - Wells
Drill Collar Safety Clamps are used to prevent the drill string from being dropped down hole accidentally if the slips or elevators securing the string lose their grip. When using the safety clamps, proper installation must be used to ensure the safety clamp holds the load, should the pipe not be gripped adequately in the main load carrying slip. This will best prevent pipe from sliding downward.
Safety clamps are able to handle a wide range of pipe OD’s by either adding or removing link assemblies and can be used with handles or lifting clevises. To ensure proper safety clamp operation, the proper number of intermediate tubular segments needs to be installed (Figure 1.).
Figure 1: Please refer to the safety clamp’s operator manual to determine the correct number of intermediate segments.
For proper safety clamp installation,refer to the operator’s manual.*
An installation procedure for a safety clamp of one brand or type may be slightly different from another. For example, the procedure to install the Varco Multi Purpose Safety Clamp is as follows:
Varco Multi Purpose Safety Clamp Installation Instructions
Again, this installation procedure is intended for the Varco Multi Purpose Safety Clamp. If a safety clamp of another type or brand is used, it is strongly recommended that the operator’s manual for that particular clamp is read and understood before use.
Safety clamps shall be lubricated regularly, both during use and while being stored to prevent corrosion. While in storage, the clamp shall be placed in its case and filled with oil (Figure 2). A lithium-based grease (or equivalent) should be used to grease the tool.
Preventative maintenance provides a systematic inspection which reduces the risk of failure and prolongs the life of the clamp (Figures 3 & 4). It is also recommended that a Safety Clamp undergoes factory magnetic particle inspection a minimum of once every six months and load tested once a year.
Figure 3: Preventative maintenance begins with daily inspections.
Figure 4: Basic repairs if tool is damaged.