Waterjet Accident Presentation Prepared by: A.M.Meyabadi [email protected].

Waterjet Accident PresentationWaterjet Accident Presentation

Prepared by:

A.M.Meyabadi

[email protected]

Waterjet Accident PresentationWaterjet Accident Presentation

In the accident, a worker in the industrial cleaning In the accident, a worker in the industrial cleaning industry was killed while cleaning a pipe with a waterjet.industry was killed while cleaning a pipe with a waterjet.

Waterjet systems are heavy-duty pressure washers with truck-mounted pumps Waterjet systems are heavy-duty pressure washers with truck-mounted pumps and engines (of about 600 h.p.). They are used in industries like oil and gas, and and engines (of about 600 h.p.). They are used in industries like oil and gas, and pulp and paper. pulp and paper.

Waterjet Accident InvestigationWaterjet Accident Investigation

With pressures up to 40,000 psi, they are much more powerful With pressures up to 40,000 psi, they are much more powerful than a home pressure washer. The spray from a waterjet can cut than a home pressure washer. The spray from a waterjet can cut like a power saw. like a power saw.


In pulp mills, residue builds up inside process pipes. The In pulp mills, residue builds up inside process pipes. The worker had been trying to clean out the lime residue from the worker had been trying to clean out the lime residue from the

end of this pipe using a 20,000 psi flex-lance. end of this pipe using a 20,000 psi flex-lance.


A flex-lance is basically a high-pressure hose with a nozzle on A flex-lance is basically a high-pressure hose with a nozzle on the end used to clean the interior surfaces of pipes. the end used to clean the interior surfaces of pipes.


The nozzle on a flex-lance blasts water backwards and The nozzle on a flex-lance blasts water backwards and forwards, self-propelling the hose through a pipe. forwards, self-propelling the hose through a pipe.


When cleaning a pipe with a flex-lance, workers insert the When cleaning a pipe with a flex-lance, workers insert the lance into the pipe, blast out the residue, and then withdraw lance into the pipe, blast out the residue, and then withdraw

the lance. the lance.


In the accident, the worker was cleaning out the end of a pipe In the accident, the worker was cleaning out the end of a pipe above him. He was standing 8 to 12 feet back from the pipe, above him. He was standing 8 to 12 feet back from the pipe,

using a new flex-lance. New flex-lances tend to want to recoil. using a new flex-lance. New flex-lances tend to want to recoil.


The worker lost control of the flex-lance. It came out of the The worker lost control of the flex-lance. It came out of the pipe, recoiled, and bored into his upper body. pipe, recoiled, and bored into his upper body.


Safe Work PracticesSafe Work Practices

A jetting gun, not a flex-lance, should be used to clean the end A jetting gun, not a flex-lance, should be used to clean the end of a pipe.of a pipe.


To clean the rest of a pipe, a flex-lance can be used along with a backout preventer.


Mark each flex-hose with paint two feet from the outlet end to help indicate where the end of the hose is when the hose is inside a pipe.


Work from a scaffold or platform to ensure that the hose or lance can be positioned no higher than your shoulders and no lower than your feet.


Flow to the lance is controlled by a worker stepping on or off a foot dump. Ensure that the worker handling the lance has direct control of the foot dump.


Wear eye and hearing protection, as well as protective boots and clothing. Consider Kevlar-lined garments.

Waterjet Accident Presentation Prepared by: A.M.Meyabadi [email protected].

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