Creates a system curve for a piping system using the static head and a coefficient.

## Usage

systemcurve(hs = NULL, K = NULL, units = c("SI", "Eng"))

## Arguments

hs

Numeric value of the static head [$$m$$ or $$ft$$]

K

Numeric value of the coefficient in the equation $$h = hs + {K}{Q}^2$$ where Q has units of $$m^3 s^{-1}$$ or $$ft^3 s^{-1}$$

units

character vector that contains the system of units [options are SI for International System of Units and Eng for English (US customary) units.

## Value

Returns an object of class systemcurve consisting of a list including:

• curve - a function defining the system curve

• eqn - a character vector of the equation for the curve

• units - the units system passed to the function

Ed Maurer

## Examples


#Input in Eng units. Coefficient can be calculated manually or using
#other package functions for friction loss in a pipe system using \eqn{Q=1}
ans <- darcyweisbach(Q = 1,D = 20/12, L = 3884, ks = 0.0005, nu = 1.23e-5, units = "Eng")
#> hf missing: solving a Type 1 problem
systemcurve(hs = 30, K = ans$hf, units = "Eng") #>$curve
#> function (x)
#> hs + x^2 * K
#> <bytecode: 0x557060008cd0>
#> <environment: 0x557060008790>
#>
#> $eqn #> [1] "h == 30 + 0.16*Q^2" #> #>$units
#> [1] "Eng"
#>
#> attr(,"class")
#> [1] "systemcurve"