PITOTLESS NOZZLE QUESTIONS
Why should I use a Pitotless Nozzle?
Because there is no pitot, small rocks and other debris can pass harmlessly through the center of the nozzle. The same debris would likely damage a pitot if it were in use. Plus, the Pitotless Nozzle accurately measures internal pressure from the inside of the nozzle to determine the flow-rate.
Is the Pitotless Nozzle accurate?
Yes. The Pitotless Nozzle was tested extensively in two different private hydraulics laboratories before being tested at the FM Approvals lab in Rhode Island. K-factors are known and consistent. In addition, FM Approvals conducts regular audits of our manufacturing facility.
In what applications should the Pitotless Nozzle be used?
It is used in flow testing, pump testing or flushing. Use it with the Little Hose Monster, the 2 ½” Hose Monster or by connecting it directly to a hydrant nozzle or pump test header flowing openly to atmosphere. Call us if you are considering another application.
What are the minimum and maximum flow-rates that can be measured?
Rates as low as 50 GPM and as high as 1400 GPM can be measured. The nozzle comes in four sizes: 1″, 1 ⅛”, 1 ¾” and 2″.
Can I connect the inlet of the Pitotless Nozzle to a test valve or hydrant nozzle, and then connect a hose to the outlet of the Pitotless Nozzle?
No. There is not enough air ventilation inside the hose, and the discharge will cause hose burn. The outlet of the Pitotless Nozzle must be open to atmosphere or connected to the Little Hose Monster or Hose Monster with built-in flow splitter. If anything else is connected to the outlet end of the Pitotless Nozzle, readings will be inaccurate.
Why do I get a suction or negative pressure when using the Pitotless Nozzle directly on a pump test header?
It is usually caused by the presence of air turbulence inside the Pitotless Nozzle. This can happen while opening a valve during a flow condition. This condition can sometimes be corrected by opening the header valve all the way and controlling the pump test flow from the valve at the pump. If this method does not work, attach a Stream Shaper, elbow or nozzle extension to the test header valve first, then attach the Pitotless Nozzle on the outlet end.