A failed air hose recoils at substantial velocity and force. In this article we estimate the force exerted by the failed air hose.Read More
Safety information and collaboration forum for the exploration drilling industry in Southern Africa.
Filtering by Category: Hose Safety
It is essential that hose socks have sufficient strength to withstand the very large forces that are exerted when an air hose or fitting fails. In this article, we examine the factors of safety of hose socks.Read More
To be effective, hose socks must be correctly sized and fitted. In this article, we discuss a simple way to ensure that the sock is correctly sized.Read More
A video by American Iron Works detailing the correct fitting procedure of hose socks.Read More
While hose sock type restraints have become a standard safety feature on drill rigs and compressors, the specification of the restraints and the fitting and anchoring methods vary significantly. In this brief article, I have suggested some checks that could form the basis of a standard for the section and installation of hose sock restraints.
This is the fourth article of Part 2 of our Technical Series on Compressor and Air Hose Safety. Click here for an outline of the entire Compressor and Hose Safety Series.
- All air hoses must be in a good general condition and must be adequately supported at appropriate places on the drill rig unit so that a failed air hose cannot fall and cause injury or damage. All hose connections must be well made up with no air leaks.
- All high pressure air hoses must be fitted with a restraint at both ends to prevent whipping if the hose becomes detached. The restraint must be of the hose sock type securely anchored at two points on the drill rig or compressor or booster 180 degrees apart.
- Hose socks must be correctly rated for the diameter of the air hose and the working pressure of the system.
- All hose socks must be supplied with a certificate issued by the manufacturer stating the Aggregate Breaking Strength of the restraint.
- The anchor points to which the hose restraint eyes are fixed must be forged type “eye” bolts correctly mounted to a secure part of the drill rig or compressor or booster. The eyes of the restraint must be attached to the anchor points with forged chain or rated shackles. It is not acceptable that the restraint is anchored to a welded fitting.
- All anchoring elements (“eye” bolts and shackles), must be rated at a Safe Working Load equal to or greater than the maximum calculated burst force of the hose being restrained.
- Hose socks must be in an as new condition and must be free of any visible damage including broken strands, rust or any other signs of wear.
On many drill rigs it is extremely difficult to find two points to which to anchor the eyes because of the position of the hose end and the proximity of other fittings and fixtures. In these cases the discretion of the engineer or safety officer must be used to determine if the fixing points provide adequate strength.
Other articles in Part 2 of the Compressor and Air Hose Safety Series
Written by Ian Speer - read more about some of the safety issues you could face and how to address them.Read More
Written by Ian Speer - read about some of the safest ways to achieve lowest hose costs while minimising the operating risks to personnel, plant and the environment.Read More
High pressure air is a potentially lethal hazard - read about the most effective restraints.Read More
A driller was severely injured when a burst hose propelled a large piece of equipment at him. This hazard alert is important as it illustrates just how powerful a burst air hose can be.
This hazard alert is part of our Technical Series on Compressor and Air Hose Safety. Click here for an outline of the entire Compressor and Air Hose Safety Series. Other hazard alerts can be viewed here.
A high-pressure air hose burst on a surface exploration drill rig while the driller was attempting to clear a blockage in the hose. The burst hose propelled the sample collection cyclone towards the driller who was operating the drill rig. The cyclone struck the driller with force. The driller sustained severe bruising to his body and back and could have been seriously injured or killed.
Read more about the causes of this incident and the recommendations for prevention in this report compiled by Mineral Resources, New South Wales.
Other articles in Part 1 of the Compressor and Air Hose Safety Series
A terrifying look at the effects of using a whip check versus a hose sock. The difference could be a life.Read More
CCTV cameras caught an unbelievable compressor explosion.Read More