110 180

SOURCE: Reference 17

SOURCE: Reference 17

heads must be converted to pump equivalent heads and added together, or all component losses must be expressed in pressure units so the total of these pressures can be converted to an equivalent pump head at the pump temperature. From Eqs. 2 and 3, the pump equivalent head is h2 = — h1

where the subscript 1 denotes the component and the subscript 2 denotes the pump. From Eq. 6, individual component head losses can be converted to lb/ft2 (N/m2) using or

Table 12 Pressure losses for backflow preventers

Flow Rate, gpm

Pressure Loss, psi, when Preventer Size Is:

2 in 3 in 4 in

6 in

8 in

10 in

Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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