By Kruyt H. R.
Unintentionally, the second one quantity of this paintings, particularly that during which the reversible platforms are handled, seemed in 1949, and now the paintings has been accomplished by way of the looks of the 1st quantity within which irreversible structures are handled. within the moment quantity I wrote a Preface, that's now, primarily, repeated, hence appearing as an creation to either volumes. -The want for a collective paintings en the technology of colloids shaped an issue of dialogue among the publishers of this paintings and myself almost immediately prior to the outbreak of the second one international conflict. the 1st arrangements have been delivered to an finish by way of the worid occasions, in view of the truth that ai! hazard of touch with overseas colleagues were damaged. while the battle persevered yr after yr, the query arose even if shall we limit ourselves to Dutch collaborators and in 1944 I despatched a request to a couple of my fellow-countrymen to take this paintings in hand. It was once instantly obvious that this р!дп was once obtain' with enthusiasm and such a lot of these who now collaborate m this paintings met to plot a plan of crusade; a couple of others, whom we invited to take action, joined us later.
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Extra info for Colloid Science. Irreversible Systems
2–3). The amount of friction loss in a hose depends upon the amount of water flowing through the hose and the velocity with which it is moving. If the hoseline is laid up a hill, the pump will need to overcome the back pressure created by the elevation, but the friction loss would remain the same. If the friction loss in 100-ft of 2½˝ hose is 15 psi, the friction loss pressure would decrease by 15 psi for every 100 ft length connected together as stated in rule 2, but the pump discharge pressure will need to be increased to compensate for the elevation loss.
External pressure applied to a confined liquid is transmitted undiminished in all directions. The downward pressure of a liquid in an open container is directly proportional to the depth of the liquid. The downward pressure of a liquid in an open container is directly proportional to its density. The downward pressure of a liquid on the bottom of an open container is independent of the shape or size of the container. indb 22 12/21/11 4:13 PM 2 THE EQUATION There is a basic equation that every pump operator needs to calculate whenever he or she operates the fire pump: EP = NP + FL + APP + ELEV where EP = engine pressure, NP = nozzle pressure, FL = friction loss, APP = appliance friction loss, and ELEV = elevation loss or gain.
2–10). Assuming each floor is 10 ft apart and the fire is on the second floor, what will the static pressure be at the standpipe connection? (Hint: Draw a diagram; see fig. ) 50 ft 20 ft 150 Feet 100 Feet Fig. 2–10. Assuming these dimensions, what is the static pressure at the standpipe connection? indb 48 12/21/11 4:13 PM Chapter 2 The Equation Overcoming head pressure The examples given have only shown head pressure moving toward the ground from an elevated height. Head also applies to upward changes in elevation.
Colloid Science. Irreversible Systems by Kruyt H. R.