• Hagen Fluval Sea CP4 Circulation Pump for Aquarium by Rolf C. Hagen (USA) Corp. [Pet Supplies]
Fluval Sea CP4 Circulation Pump's spacesaving size and innovative design provides many outstanding benefits: it minimizes tank intrusion, improves energy efficiency, and delivers a smooth broad stream of ocean-like current. Unlike other pumps, this efficient circulation pump broadcasts output to assist corals with a gentle, indirect current. Key Features - Simulates natural reef currents - Adjustable flow direction - Exceptional hydraulic performance with the lowest energy consumption/LPH ratio - Super quiet compared to most models - Safe to use with timer system (will not cause pump failure unlike many competitive models) - Secure, flexible aquarium mounting - Unique suction system support for versatile installation positions - Compact, efficient, easy maintenance - Gentle, even flow compared to many competitors - Super compact compared to equivalent models - Flow Rate: 1375 GPH - Watts: 7 watts - For Aquariums up to 90 Gal - Size: Length 12.5 cm x 7.2 cm dia Fluval Sea Aquarium Circulation Pump (CP4), 7W, 1375 GPH. For aquariums up to 90 Gallons.
  • Roaring 20's Bathtub Filler with Astor Lever Handles and Angled Handshower Satin Gold
  • This item is used for Plumbing Fixtures, Tub and Shower Faucets and Accessories
  • Item is manufactured in United States

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Hagen Fluval Sea CP4 Circulation Pump for Aquarium by Rolf C. Hagen (USA) Corp. [Pet Supplies]

  • $55.99

Dynamic Head

The effect of the Earths gravity on the "lift" or head pressure is fairly simple; for every vertical foot of distance the pump moves the water you are adding one foot of head pressure so the ratio is a 1:1 ratio. The effects of the friction, caused by water as it travels through your hose or pipes, on the total head pressure is a little more difficult to calculate especially as there are slight variations in pipe friction in different hose materials and the smoothness of the inner bore. Basically. for every ten feet of pipe through which the water has to travel travel horizontally will contribute 1 foot of head height; the ratio of the pipe friction loss is a 10:1 ratio.

Plumbing fixtures and bends and corners in your hose also increase the total head you must calculate to ensure the proper final volume from your pump. Every corner with a 90 degree elbow in your plumbing will add 1 foot of head pressure  with a 1:1 ratio. 45 degree elbows, tees and even insert couplers can all have an impact on the final flow.

If you install a pump 40 feet away from the top of your waterfall which is 6 feet above the pump and the tubing is a single run of 40 feet horizontally then you add 4 feet of head for the tubing length (the 10:1 ratio) to the 6 foot differnetial between the pump location and the final height of the waterfall so your final total dynamic head calculation would be 10 feet. This means your final volume of water flow in this water feature or application would be the volume of flow on the performance curve that equaled the gallons per hour at 16 feet. This volume will certainly be much less than the initial volume the pump can move at an open flow or a zero head.

If in the above example your 40 feet of horizontal tubing run also required 3 elbows of 90 degrees then an additional 3 feet of theoretical head would be added and your final flow result would be at 19 feet on the performance curve of the pump. In this example you would want to choose a pump that has the desired GPH rating at 9 feet of head pressure.  Tubing size is also an important factor in accounting for head pressure loss, in general you should never reduce the diameter of the tubing below what the output size of the pump is, this will drastically increase head pressure, and reduce pump performance.  For maximum pump performance, using the largest tubing that is practical is the best choice. A best practice is to use a hose with an inner diameter that is the same as your pumps outlet fitting.

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