Monthly Archives: January 2019
CPVC fire sprinkler pipe. Why do we use it? This is a product that the fire protection industry has used for years, but now we seem to be seeing it fail at an increasing rate. What is causing this? There is an excellent article on this that I feel all should read. It can be found on the web at:
It identified 4 basic causes of failure. Contamination, Installation practices, Manufacturing defects, and other. Of all of these contamination is the most prevalent and also in so many ways beyond our control. If we get a good product that is not defective, If it was shipped and stored properly, Then we have to make sure that the installer is well trained and all of our products are compatible with the pipe. But after that we are at the mercy of so many others.
Therefore it is important to document the products we use and practice good CYA in informing the customer of the risks associated with possible contamination of the pipe by other trades and by service personal after the project is turned over to the owner.
The Water Flow Switch is mounted on a wet-pipe system only. The water flow in the pipe deflects the paddle. The deflection of the paddle produces a switched output. All detectors will activate on a continuous flow of water greater than 10 gallons per minute (gpm) but will not in subtle surges of less than 4 gpm.
Information from Potter Electric Water Flow Alarm Switch Installation Guide:
“The units should not be installed within 6″ (15cm) of a fitting which changes the direction of the water flow or within 24″ (60 cm) of a valve or drain.”
The Water Flow Switch should be mounted 6 to 7 feet above the floor to minimize the switch from being damaged.
Below are two pictures of a Wet Pipe Sprinkler Riser, One was installed properly and the other is “WRONG”.
I’ve been in the fire protection business for many years and when I see something like this it makes me mad. I cannot believe that a fire protection contractor can let this happen, then the AHJ approved it. I hope by showing the correct and incorrect ways of installation of fire protection equipment will help us all.
What is the best material available to man to use in fire protection systems? Oxidane, Hydrogen oxide, Dihydrogen monoxide, Hydrogen Hydroxide, Hydroxylic acid, Hydroxic acid H2O or just plain old WATER? Actually all the items listed are just water!
We are in the business of putting water on fires. Either as a fire sprinkler contractor or fire fighter. We both employ specialized equipment whose only purpose is to get water on the fire in many different ways.
What makes water such a great fire fighting medium? Both as liquid water and as vaporized steam, water has properties that make it good for firefighting. Water has a high capacity for holding heat. Thus when applied to a fire, water carries the heat away and reduces the fuel’s temperature. When water absorbs enough heat it turns to steam which is effective in displacing oxygen and starving the fire.
What is the pressure rating of a Class 125 fitting? What is the pressure rating of a Class 250 fitting? The answer to both of those questions is the same. It depends!
One thing that’s been a problem over the years in dealing with fittings is the nomenclature used. For years we called our cast iron fittings 175 pound fittings. And then when we needed higher pressures we called for 300 pound fittings. I’ve had plenty of discussions with engineers over what fittings to use due to a general misunderstanding of how fittings are rated. I learned to start by trying to educate people about this subject.