Dura-Built versus Poly-Tuff

NAFH logo with text color2015_DuraBuilt2015_PolyTuff

 

 

 

 

Dura-Built and Poly-Tuff are very similar types of hose and fire departments often select one or the other based on severity of service or budget limitations. The hoses are both backed with the confidence of North American Fire Hose Corporation’s Life Time Delamination Warranty on the Calendared/Vulcanized EPDM Rubber Liner.

When reviewing the Nylon and Polyester Jackets, these are key characteristics to consider:2015_HoseChart_2

 

 

 

It is important to note that even though these hoses have the same liners, the friction loss might not be equal. The flexibility of a Nylon jacket and that of a Polyester jacket is very different, and can affect friction loss.

Here are flow test numbers using both hoses at the same GPM Flow: 2015_HoseChart

 

 

You can see where the more flexible nylon jacketed Dura-Built scores better in friction loss.  We look forward to discussing your needs and determining which hose type is best for your department. Contact us today.

Know Your Fire Fighting Nozzle!

GForce_Nozzle

 

 

 

 

 

Can you identify the most common firefighting nozzles produced today? What are they?

  1. Automatic Nozzles
  2. Fixed Flow Nozzles
  3. Smooth Bore Nozzles
  4. Selectable Flow Nozzles

Now….do you know the benefits and limitations of each device? Even if your department uses one specific type of firefighting nozzle, it’s good to know what’s out there and what you could possibly run across.

  • Automatic Fire Nozzles
    Pros: self-adjust to provide quality stream and reach, regardless of GPM flowing.
    Cons: can furnish a great stream and reach, though perhaps not flowing ample water
  • Fixed Flow Fire Nozzles
    Pros: fixed GPM and Nozzle Pressure; pre-determined by department
    Cons: can have poor stream and reach at low pressures
  • Smooth Bore Fire Nozzles
    Pros: high GPM flows at low Nozzle Pressure
    Cons: can lead to firefighting hose kinking
  • Selectable Flow Fire Nozzles
    Pros: nozzle person can “select” the flow rate desired
    Cons: GPM selection indicator can be set at incorrect GPM

Regardless of the fire nozzle that is being used, it is absolutely imperative to familiarize yourself with how it works and its limitations! Train with it…Flow it…Then… train with it some more!

Familiarizing yourself with the benefits and limitations of all types of firefighting nozzles will improve safety, reduce risk and equip you to assist in determining the most suitable fire rescue tool for your department, allowing you to get the wet stuff on the red stuff effectively.

Playing the Word Game: Fire Hose Construction

Some hose manufacturers who may not be able to measure up in quality or durability will play word games with their sales brochures. Phrases are strung together using words like “lighter weight”, “higher flows”, “increased picks per inch”, “high strength”. All of these phrases, taken independently, can be good characteristics when it comes to fire hose construction. However, some are mutually exclusive when it comes to the world of physics and reality.

Let’s look closer!

Phrases on Page 1 of one of those Sales Brochures
“Weighs Less”, “Kinks Less”, and “Flows More Water”

Let’s break these down:

  1. Weighs Less:  How do we make hose lighter?  We take material out.
  2. Kinks Less: Hose that is lighter weight, gives up resistance to kinking as compared to ‘standard’ weight/construction hoses.
  3. Flows More Water: High performance liner?  Not at low end prices.  Oversize hose?  Yes…

And, let’s look at these claims:

Phrase on Page 2 of one of those Sales Brochures
“Increased the picks per inch for greater strength and abrasion resistance.”  (Remember, this statement is preceded by “Weighs Less” on page 1 of the brochure!)
  1. But I thought you said the hose is lighter? How do we make hose lighter? Again, We take material out…
  2. But it says the “picks per inch have been Increased”.  If there are more Picks and more Weft (Filler) AND the hose got lighter…That means there is less Warp. (Warp is the expensive part of the materials in the hose jackets.)
  3. How does making the warp weaker, increase strength?  It doesn’t. Remember, in hose testing, Filler Fails First. But if Filler is added, and Warp is removed, how can the hose fail correctly/safely?
  4. Abrasion Resistance? Making hose lighter (and not changing materials of construction) , cannot increase abrasion resistance. Removing warp from a fire hose does not increase abrasion resistance. The warp material, its quality and physical characteristics, determine the resistance to abrasion.
CORRECT FAILURE Failure of Filler/Weft: Weft goes Left/Right (around) hose

CORRECT FAILURE
Failure of Filler/Weft: weft goes left/right (around) hose

INCORRECT (UNSAFE) FAILURE Failure of Warp: Warp run Lengthwise with Hose

INCORRECT (UNSAFE) FAILURE
Failure of Warp: warp runs lengthwise with hose

Our team of Water Flow  Specialists are available to walk you through each phrase and answer any questions you have!

Buying Fire Hose: Go Cheap or Go Quality?

Fire Departments have numerous manufacturers to choose from when deciding to purchase fire hose. Once the process starts, department personnel spend time sorting out the hype and laying out the facts. Budgets and financial constraints often play a key role in whether the decision is made to purchase the less expensive product or to spend more, opting for higher quality.

The demand on the fire ground is extreme. Hose is pulled, dragged, scraped, deployed, charged and expected to perform, time and time again. Those savings made when purchasing a lesser expensive product are quickly diminished when the hose fails.

More importantly, a major hose failure can also reduce the safety of the crew while they are in the midst of any type of structural or wildland firefighting scenario.

Buying cheap hose reduces safety and any reduction in safety inevitably leads to higher costs.