Archive for June, 2009

The Dangers of Your Backyard Pool

Monday, June 29th, 2009

There may be no activity more synonymous with summer fun than the “splish, splash” of swimming in a backyard pool.  Unfortunately, however, there are hazards lurking in and around most pools that families often overlook. In order to keep pool safety top of mind, American Leak Detection is offering people tips to prevent pool-related injuries.  Whether you have a pool and spa or your family enjoys cooling off in a community pool, this information shouldn’t be missed.

While people of all ages and sizes are susceptible to the dangers of faulty pool drains, young children tend to be at the highest risk.  According to the Centers for Disease Control (CDC), more than one in four drowning victims are children age 14 and younger.  For every child who has died from drowning, another four have received emergency care for nonfatal submersion injuries.

Take the following preventative measures before allowing swimmers to enter their pools:

  • Replace old flat drain covers and never use a pool or spa with a missing or broken drain cover.
  • For public pools, install anti-vortex drain covers.  A simple retrofit to install anti-entrapment covers will protect both children and adults from body and hair entrapment in the suction outlets.
  • Have a professional regularly inspect the pool or spa for entrapment or entanglement hazards.  Ask them to clearly mark the location of the electrical cut-off switch for the pool or spa pump.
  • Install a Safety Vacuum Release System (SVRS) to automatically shut off a pump if a blockage is detected.
  • If someone is trapped against a drain, immediately turn off the pump.  Pry a hand between the drain and the person’s body to break the seal instead of trying to pull the person away from the powerful suction.

The summer season is a carefree time of year, but that does not mean that people should take a carefree approach to proper pool maintenance.

Does a ‘humming’ noise from under the sink indicate a leak?

Friday, June 26th, 2009

Usually yes. A ‘humming’ sound coming from a water pipe is often a good indication of water loss occurring somewhere along the piping system. This can occur in two ways: Loss through a fixture or outlet (i.e. faucet or leaky toilet) or loss through an actual leakage point along the line.

It is pretty easy to understand the way a running fixture makes noise on pipes. Water flows at a rapid rate through the line and causes the pipe to vibrate as the water leaves the outlet. Also, friction created by the water flow against the inside of the pipe sends vibrations that can be detected by the human ear.

The sound created by a leak in the pipe itself is a little more complex to understand. Essentially, the humming sound created by a leak in the pipe is driven by a pressure difference between the water inside the pipe and the ambient atmospheric pressure around the pipe.

When a leak develops in a pipe, a pressure loss occurs in the pipe at the leak site as the pressure in the pipe tries to equalize with the pressure outside the pipe. This pressure loss creates pressure waves that travel in both directions down the pipe and away from the leak. We call this ‘leak energy.’

In most cases, the human ear alone cannot hear this leak energy. It takes electronic leak detection tools that amplify selected sounds. If you can hear the leak energy without equipment, there is a good chance the leak is close by or has developed in size enough to be quite loud.

If the humming sound you hear is not from flow or a leak in the pipe, a contact point between the pipe and a vibrating appliance or machine such as a refrigerator or air conditioning unit could also cause it.

In any of the cases mentioned above, you can save some time and money by taking a look around your home for some obvious clues. Double-check all of your interior faucets and toilets. Check outside hose bibs and valves, too. If you don’t find anything, you may need to call a leak detection specialist to perform further investigation with specialized electronic equipment and professional experience.

AWWA ACE 2009 Pipe Tapping Results

Wednesday, June 24th, 2009

The AWWA National Tapping Contest is a competition of skill in which water operators from across the US work against the clock to open a cement-lined, ductile iron pipe and install a tap. The contests begin at the local AWWA Section level and the winners are then eligible to compete in the national Tapping Contest. There are two divisions, Men’s and Women’s.

Learn more about the Pipe Tapping Contest.

Congratulations to the 2009 Tapping Team Champions

Men’s Final Champions

Tacoma Water Tapping Team: 1:13:38

Women’s Final Champions

Alamo City Tappers: 2:00:88

Check out the Pipe Tapping hall of Fame to view the past winners of the Pipe Tapping Contest.

View the past Pipe Tapping videos

Pipe Tapping Videos

What’s the best way to tap a water main?

Wednesday, June 24th, 2009

Pat Kline of Opflow has written a thorough article answering the question posed as the title of this blog posting. The article was published in Opflow‘s, May 2009 edition.

Below is a brief preview of the article.

QUESTION: I’ve seen many methods for connecting service lines to mains or laterals. Is there a rule of thumb to help me determine what to do in a given situation?

ANSWER: The method you choose to connect a service line to a main or lateral will affect whether you’ve made a tight, reliable connection that will give your customer years of satisfactory service. Let’s look at the factors involved one by one.

First, are you making the connection while the water main or lateral is left on or turned off? Dry taps, as they’re called when the main is shut down, are usually performed during main installation or other repairs. Dry taps are generally T-connections installed in the main or lateral. Wet taps, or hot taps, which use sleeves or saddles, are performed when the main or lateral is under pressure. It may seem as though dry taps would be the method of choice, but shutting the main down can cause water loss, increased potential for contamination, and lack-of-water or dirty-water complaints. Utilities perform wet taps most frequently, so that’s what we’ll talk about.

The article is broken down into the following sections. I will paraphrase each section.

A Valve By Any Other Name

There are different names for valves, but the end that connects to the main is the inlet, and the end that connects to the service line is the outlet.
Read the full article.

The Art of Tapping

  • The tapping tool is specific to the water main material.
  • Ensure the valve stop threads match those of the tap.
  • Use gaskets between the tapping machine and the saddle, and between the saddle and the pipe.
  • Keep the outside of the pipe and the tapping drill disinfected and clean while tapping.
  • Tap at 45 degrees in relation to the centerline of the pipe.

Read the full article.

Turn, Turn, Turn,

Learn about the terminology involved in the details of pipe tapping.

  • Thread pitch
  • Major diameter | Minor diameter
  • Pitch diameter
  • Engagement
  • Effective thread
    • The full article provides the measurements, and formulas you need to help you tackle that pipe that needs a hot tapping.

      Read the full article.

Can my large pond be tested for leaks?

Friday, June 19th, 2009

Absolutely. Modern leak detection technology has made it possible to test even large water holding structures such as ponds and fountains. Not every company is equipped or experienced enough to handle large pond leak detection work, but there are companies out there that specialize in this kind of work.

Depending on the amount of water loss, the size of the recirculating system, and the condition of the pond interior, a good leak detection company should be able to give you a summary of all the work involved and a reasonable estimate for the leak detection.