Huntley's Sub Aqua Construction

OPERATIONAL STANDARDS:

Potable Waster Reser Huntley's Sub-Aqua Potablewater Solutions Huntley's Sub-Aqua Potablewater Solutions Huntley's Sub-Aqua Potablewater Solutions Huntley's Sub-Aqua Potablewater Solutions Huntley's Sub-Aqua Potablewater Solutions
You do have an easier solution for cleaning your reservoir!

Huntley’s Sub-Aqua Construction specializes in reservoir inspection, cleaning and repair

The following specifications and purpose for each have been adopted by Huntley’s Sub Aqua Construction as standards that are necessary to competently and safely perform dive operations in potable water tanks.

Require Divers to use Dedicated Dry-Suits Made of a Material Suitable for Disinfection:
ANSI/AWWA Standard. Prevents contamination of water. Diver’s body does not come in contact with water. The suit must be dedicated to potable water use, ¬because a suit used in contaminated ¬water cannot be adequately disinfected for use in potable water. The only material suitable for disinfection is vulcanized rubber. Neoprene or shell drysuits are too porous for rapid chemical disinfection.

Use of Dry Commercial Diving Hard Hat.
Meets DCBC Standard and all provincial Department of Health requirements of using external or surface supplied air. The commercial diving hard hat keeps the Diver’s head and neck from having any contact with the water column. It prevents the diver from contaminating the water with saliva or mucous from his sinuses and/or nasal passages. It prevents any contamination of the water from sweat, skin, hair, or associated microorganisms found on the diver’s body. Use of surface ¬supplied air without hard hat (helmet) is ¬unacceptable because saliva and mucous will escape through regulator and mask.

Divers using SCUBA generally use a facemask or full-face mask. Changes in pressure and temperature cause excessive production of mucous from sinuses and nasal passages. It flows out of the mask into the water when the air pressure increases inside the mask or the diver exhales through his nose. This occurs with a SCUBA mask, full-face mask, EXO or AGA mask. The latter full-face masks are much better than a SCUBA mask; however, they are still unacceptable. The SCUBA regulator allows direct exhalation of air and ¬saliva into the water. A hard hat prevents these substances from flowing into the water.

Beyond contamination issues a hard hat ¬allows the diver to have full-time reliable voice communication. This is possible due to the fact that the diver does not have to hold a regulator mouthpiece between his teeth and his head is in an air pocket. Therefore, the microphone and speakers mounted inside the hard hat are as functional as they would be out of the water. Another advantage of the hard hat is that it allows for mounting of a video camera and lights. This allows the diver to video all work being accomplished.

Disinfection of All Equipment With 200ppm+ Chlorine Immediately Prior to Entering System:
DCBC and ANSI/AWWA Standard. Prevents contamination of water. External or Surface Air Supply: DCBC and OHSA regulations are specific in requirements for SCUBA that are so limiting that make it impractical to use. SCUBA is unacceptable in potable water dive operations. OHSA requires that surface air supply ¬operations have two back up air sources. One is on site back up and the second is a diver carried reserve. HSAC divers have a primary air source and two backup air sources. The primary air source is a gasoline engine driven compressor. If the compressor stops the primary back up automatically transfers air to the diver. Even after the compressor stops the diver has approximately 15 minutes of air left in the system. The first backup air supply is comprised of two high pressure cylinders in the dive ¬support trailer, which hold approximately 8 hours of air. The second emergency air backup is a small cylinder carried on the diver’s back called a “bailout bottle”. In the unlikely event that the diver finds himself without air he can manually turn on the bail out air supply, which provides enough air to safely exit the reservoir. OHSA regulations require that commercial divers have their air compressor monitored or tested for maximum carbon monoxide levels daily or in the case of air supply ¬cylinders have each batch of cylinders tested when they are filled. HSAC exceeds this requirement by constantly monitoring all air supplied to the diver whether by the compressor or the backup high-pressure cylinders. All air passes through the air monitor before reaching the diver and shows carbon monoxide levels as well as oxygen levels.

Full-Time Reliable Voice Communication between surface and Diver:
This is an OHSA regulation. The system allows for ¬constant communication between the diver, and all surface personnel. The diver, dive controller in the support vehicle and the dive tender at the reservoir entrance point can communicate with each other at all times. In addition, utility employees can communicate with the diver at any time. It is apparent that full time communication with the diver is an important safety factor. But for ¬purposes of a more efficient inspection, cleaning, and repair program this enables the diver to immediately discuss any observations he makes inside the reservoir. This is important when considering how difficult it is to pinpoint a specific area when inside a large water tank.

Because of constant communication with surface personnel and constant video viewing it is easy to locate and identify the observations made by the diver. It also saves a great deal of time and money when the utility staff can tell the diver how to deal with an extraordinary problem while the diver is there and able to perform the task at that moment.

Full time voice communication also allows for, and is the only way to have, accurate live voice input on video when recording.

Full-Time Live High Resolution Color Video:
Allows for constant viewing of diver’s work and observations. This has apparent safety considerations, but helps most when evaluating the work accomplished inside the ¬reservoir. It is impossible for the diver to do a haphazard job or cause turbidity in the water column while he is under constant ¬visual scrutiny. If a contractor cleans a ¬reservoir without live video and then goes back and video tapes the interior subsequent to the work, it is impossible to tell whether the entire reservoir is being observed on the tape or how much sediment was stirred up into the water during the cleaning process. Regardless of how good a persons memory is, it is difficult to remember the details of the inside of a reservoir after spending as much as 8 or more hours cleaning it and then returning to video tape the results and later adding voice narration to explain what is on the silent video tape. That is why HSAC uses full-time, live video with full-time voice communication that is recorded simultaneously with the visual record. It is also important that the video is high resolution and that it have infinite focus.

Nova Scotia Construction Safety Association
Canadian Association of Diving Contractors

 

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