Common Safety Errors Found in Pressure Washing, Hydroblasting, or WaterJetting

May 17, 2011

FEATURED, Main Library

Common Safety Errors Found in Pressure Washing, Hydroblasting, or WaterJetting

Reviewed: 2011-05-17 by Lydia Frenzel

The Advisory Council compiled a Special Report of errors, accidents, incorrect assembly practices and faulty work habits in 2002. Luis Ortega Trotter, who is now deceased, from AcquaBlast in Brazil provided the photos to the Advisory Council WaterJet Workshop on Surface Preparation held at the 2001 WJTA Conference. Ortega was concerned about the difference in the training and education of the work force in Central and South America and developing countries, compared to those of North America-Canada-USA-Europe.

These mistakes seem like “It couldn’t happen on my site.” They are mistakes that might not be observed in a quick inspection. Yet Lydia Frenzel gets calls about cut or frayed hoses, kinked lines, and pressure relief valves that are installed incorrectly. Don’t let this happen on your site. Contact the Advisory Council for a copy.

Luis Ortega received the WJTA Best paper award in 2001 for his Comparison of Abrasive Blasting, Wet Abrasive Blasting, Waterjetting-Hydro Blasting, Needle Gun cleaning, and Grinding on a Pulp Mill in Brasil (Brazil). The paper compares salt residuals and costs. Contact the Advisory Council for a copy and his presentation. Frenzel lost contact with AcquaBlast after Luis Ortega died and Juan C. Ortega became the owner. Web site is; email:

The errors include:

1 Incorrect installation of water filter in the wrong direction resulting in deformation of the pressure filter

2 Blown-out hose out due to incorrect installation of particulate water filter.

3 Pressure relief seal installed incorrectly

4 Over tightening of fittings.

5 Caustic in by-pass valve resulting in failure

6 Missing pipe connection that results in blow-out of concrete

7 By-pass assembly damaged from being dropped or falling

8 Cutting of hoses on sharp edges

9 No hose covering or sheathing or protector

10 Destruction of triggers of jetter pistol/gun from caustic so that dual trigger protection was not operational

11 Incorrect scaffolding

12 Employee without gloves, security-safety-tie-off belt; single trigger instead of dual trigger, gun

13 Employee placing a hand in the water bypass (water dump hose)

14 PVC gloves instead of steel mesh or waterjet safety gloves

15 No eye protection or gloves

16 No whip lock or whip check

17 Terminal end of high pressure connection has damaged thread, no lubrication

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3 Responses to “Common Safety Errors Found in Pressure Washing, Hydroblasting, or WaterJetting”

  1. residential pressure washing richmond va Says:

    Cleaning Service offers daily, weekly, bi-weekly, or monthly services, as well as moving in or out specials or just one time. We individualize cleaning services to fit you and your home. More than 15 years of experience has taught us that every home is as unique as the people living there. Price on home cleaning is based on many factors, one size of your home and the frequency for cleaning are some of those factors. Also people live with different numbers of pets as well as different levels of clutter and different customs.

  2. lydia frenzel Says:

    Good to hear from someone who has found this site.
    Thanks for the comment.

  3. Robert Thomson Says:

    RMT has been on jobs where hand held water jetting guns were used for surface preparation. My observations are that normal hard hat / face shield combinations are prone to fogging and accumulating debris which in turn reduces the operator’s vision of the work surface. As a result, areas that are already cleaned can be unnecessarily re-blasted while other areas get missed. It appears that gun operators can spend a lot of time clearing their visors and possibly an equal amount of time using “best guess” aiming of the gun.

    I have some questions about this:

    -How challenging is this problem throughout the water jetting industry?

    -Are there any estimates of average lost productivity % due to poor vision through fouled visors?

    -What equipment or techniques are available now that address the problem?

    -Would there be a significant market for a new visor technology that provides full time clear vision regardless of debris blow back?

    I will value and appreciate your expert comments if you can spare a moment.

    Thank you and best regards;
    Bob Thomson
    RMT Industrial Sales and Service Ltd
    Sydney, N.S. Canada

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