Estimate Method Calculator

Detailed Description

This calculator implements the estimate method, a rapid field technique for evaluating compressed air leak severity without specialized measurement equipment. An operator categorizes a leak by observable indicators — audible hissing, visible moisture or contamination at the leak point — and selects a corresponding estimated flow rate from a lookup table based on those clues.

The estimate method is most appropriate for initial leak surveys and triage, where speed of assessment takes precedence over accuracy. Individual leaks identified as significant should be re-measured with a higher-accuracy technique (bag method, orifice method, or inline flow meter) to obtain a reliable economic impact estimate.

The method requires only two inputs:

• Estimated leak rate – assigned from a leak severity lookup table based on visual and audible clues [scfm].
• Annual operating time – the number of hours per year the compressed air system is pressurized [hr].

Annual Consumption:

Estimated annual air consumption from a compressed air leak assessed by the estimate method.

Annual air loss is computed by multiplying the estimated leak rate by the annual system operating time and a minutes-per-hour conversion factor, then dividing by the scf-to-kscf conversion factor. The factor of 60 converts operating hours to minutes so the units are consistent with the flow rate expressed in scfm. The factor of 1000 converts standard cubic feet to kiloscf, which is the conventional unit for annual compressed air volumes in industrial energy assessments.

\begin{equation}\label{eq:estimate-method-annual-consumption} C_{annual} = \frac{\dot{Q}_{leak} \cdot t_{op} \cdot 60}{1000} \end{equation}

Symbols

\(C_{annual}\)	Estimated annual air loss from the leak \([\unit{ \kscf}]\)
\(\dot{Q}_{leak}\)	Estimated compressed air leak flow rate \([\unit{ \scfm}]\)
\(t_{op}\)	Annual system operating time \([\unit{ \hour}]\)
\(60\)	Minutes per hour conversion \([\unit{ \minute\per\hour}]\)
\(1000\)	Standard cubic feet per kiloscf conversion \([\unit{ \unitless}]\)

Note

The result is in kiloscf (kscf), where 1 kscf = 1000 standard cubic feet. This unit is conventional for annual compressed air volumes in industrial energy assessments.

Modules
	Estimate Method Annual Consumption Formula
	Estimated annual air consumption from a compressed air leak assessed by the estimate method.

Files
file	estimate_method.h
	Declarations for the estimate method compressed air leak annual consumption estimation.

Namespaces
namespace	estimate_method
	Compressed air leak estimation using visual and audible assessment.

Classes
struct	estimate_method::Input
	Input parameters for the estimate method compressed air leak calculation. More...
struct	estimate_method::Result
	Result of the estimate method leak annual consumption calculation. More...