Energy Responsible Tool
Estimating Instrument Pneumatic Supply Consumption at Steady State
|
 |
|
||||||||
| Model | ||||||||||
| Supply Pressure | ||||||||||
| Air | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Steady State Consumption (SCFM) | ||||||||||
| Operation Cost () | ||||||||||
| Emissions (Tonne of CO2e) | ||||||||||
| — Carbon Credit Cost () | ||||||||||
| Natural Gas | ||||||||||
| Steady State Consumption (SCFM) | ||||||||||
| Operational Cost () | ||||||||||
| Flared Emissions (Tonne of CO2e) | ||||||||||
| — Carbon Credits Cost () | ||||||||||
| Vented Emissions (Tonne of CO2e) | ||||||||||
| — Carbon Credits Cost () | ||||||||||
| Print this estimate | ||||||||||
This Energy Responsible Tool web-based tool ("Tool") is provided for informational purposes only and on an "as is" basis, without any representations or warranties, expressed or implied, of any kind, including but not limited to, warranties of merchantability, non-infringement, or fitness for a particular purpose. Emerson Process Management a business division of Emerson Electric Co., and its affiliates do not warrant the accuracy, reliability or completeness of any information contained on the Tool. Nor does it warrant or represent that any information may be suitable for use in any circumstance or application. Emerson Process Management assumes no responsibility and shall not be liable for any damages of any nature caused by the use of the Tool.
© 2011 Emerson Electric Co. All rights reserved.
Privacy Policy
Please see the Emerson.com privacy policy.
Terms of Use
The Energy Responsible Tool web-based tool ("Tool") is provided for informational purposes only. The Tool and related materials and communications are provided "as is" without any representations or warranties, expressed or implied, of any kind, including but not limited to, warranties of merchantability, non-infringement, or fitness for a particular purpose. Emerson Process Management a business division of Emerson Electric Co., and its affiliates do not warrant the accuracy, reliability or completeness of any information contained on the Tool. Nor does it warrant or represent that any information may be suitable for use in any circumstance or application. By using the Tool you acknowledge that any reliance on any such materials, calculations, formulas, advice, statements, or information shall be at your own risk. Emerson Process Management assumes no responsibility and shall not be liable for any damages of any nature caused by the use of the Tool. This express disclaimer includes, without limitation, damages caused by viruses, worms, Trojans or any other computer software or anomaly that may infect, affect, or damage your computer hardware, software, memory or any other property of yours or others, as a result of your access to, use of, or browsing in this Tool.
Emerson Process Management may provide, as a convenience to you, links to web sites operated by other entities and persons, but makes no representations whatsoever about any other web sites which you may access through the Tool. Any link to a non-Emerson Process Management web site does not mean that Emerson Process Management endorses or accepts any responsibility for the content, or the use of such web site. If you use these sites, you do so at your own risk. Emerson Process Management makes no warranty or representation regarding, and does not sponsor or endorse, any linked web site(s) or the information or materials appearing thereon or any products or services described or offered thereon. Furthermore, the provision of such links does not imply that Emerson Process Management is affiliated or associated with, or that any linked site is authorized to use any trademark, trade name, logo, or copyright of Emerson Process Management. Any opinions, statements, services, offers or other information or content expressed or made available in any third party web site are those of the respective author(s) or distributor(s) and not of Emerson Process Management.
Emerson Process Management reserves the right, in its sole discretion, to revise these terms at any time and correct any errors or omissions in any portion of the Tool and related materials. The Tool and related materials may also be changed, modified, added, or removed and updated without notice at any time; however, Emerson Process Management is under no obligation to update materials.
Your continued use of the Tool after any change Emerson Process Management makes to the Tool will be considered acceptance of those changes.
You should revisit these terms from time to time to review the then-current terms because they are binding on you.
This Tool is based only on a single aspect of pneumatic steady state consumption. All steady state consumption values used in the Tool are provided from the applicable manufacturer's product bulletin's specifications. Other than the steady state aspect, the pneumatic energy consumption of the instrument depends on several other aspects of the process loop components, including, without limitation:
- The control valve and/or actuator design and performances
- Calibration and tuning of the field instruments (controllers, positioners, transducers, regulators, relays, volume boosters, etc.)
- Supply pressure (20 psig, 35psig, etc.)
- Quality of the supply media
- The control loop performance
- Instrument dynamic response
The following related publications provide further information that may be important to your product considerations. Please contact your local Emerson Process Management Sales office for further information.
- Control Valve Handbook
- Technical Monograph 8: Generalized Control Theory
- Technical Monograph 27: Fundamentals of Gas Pressure Regulation
- Technical Monograph 32: Fundamentals of Closed Loop Control
- Technical Monograph 36: Guidelines of the Application of Electro-Pneumatic Positioners and Transducers
- Technical Monograph 40: Fundamentals of Dynamic Valve Performance
- Technical Monograph 49: Control Valve Impact on Loop Performance
- "Process Control Goes Green", Valve Magazine, Winter 2008
Fisher is a mark owned by one of the companies in the Emerson Process Management business division of Emerson Electric Co. Emerson Process Management, Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.
- SCFM
- Standard Cubic Feet Per Minute at 60�F and 14.7 psia
- MCSF
- Thousand Standard Cubic Feet at 60�F and 14.7 psia
- kWh
- Kilowatt Hour
- MMBtu
- Million British Thermal Units (MM = 1000 * 1000 = 1,000,000)
- GWP
Global Warming Potential
The cumulative radiative forcing effects of a gas over a specified time horizon resulting from the emission of a unit mass of gas relative to a reference gas.
(Source: EPA)- CO2e
Equivalent Carbon Dioxide
Equivalent CO2 (CO2e) is the concentration of CO2 that would cause the same level of radiative forcing as a given type and concentration of greenhouse gas. (Source: EPA)
- EPA 6SCFH
- Enviromental Protection Agency NSPS Quad 'O' limits 6 SCFH for pneumatic controllers in the Oil and Gas Sector. (Source: EPA)
- Convert Gas
- Convert Gas Pneumatic Controls to Instrument Air. (Source: EPA)
- Flared
- Flaring is a high-temperature oxidation process used to burn combustible components, mostly hydrocarbons, of waste gases from industrial operations. (Source: EPA)
- Tonne
- 1000kg. Also known as a metric tonne. (1 tonne = 2,204.6 lbs)
- HHV
- Higher heating value
- Carbon credit
- A carbon credit is a generic term for any tradable certificate or permit representing the right to emit one tonne of carbon dioxide or the mass of another greenhouse gas with a carbon dioxide equivalent (tCO2e) equivalent to one tonne of carbon dioxide. (Source: EPA)
- psi
- Pounds per square inch. (1 psi = 0.0689 bar)
Calculator Formulas
| Air | |
|---|---|
| Steady State Consumption (SCFM) | Product's Steady State Air Consumption (SCFH) / 60 [converts H to M]. |
| Operation Cost () | kWh cost of electricity in * kWh Usage per MSCF of Compressed Air * Years of Operation * (60*24*365/1000) [converts SCFM to annual MSCF] * Steady State Air Consumption (SCFM) |
| Emissions (Tonne of CO2e) | Steady State Air Consumption (SCFM) * (60*24*365/1000) [converts SCFM to annual MSCF] * Years of Operation * kWh Usage per MSCF of Compressed Air * Grams of CO2 Emitted per kWh of Electricity * (0.001*0.001) [converts gram to tonne] |
| — Carbon Credit Cost () | Carbon Credit Cost (/tonne) * Product Emissions |
| Natural Gas | |
| Steady State Consumption (SCFM) | Steady State Air Consumption (SCFH) / Gas Sizing Factor1 / 60 [converts hours to minutes] |
| Total Operational Cost () | Steady State Gas Consumption (SCFM) * (60*24*365/1000) [converts SCFM to annual MSCF] * Cost of Gas ( per MSCF) * Years of Operation |
| Flared Emissions (Tonne of CO2e) | Steady State Gas Consumption (SCFM) * (60*24*365/1000) [reduces SCFM to annual MSCF] * Btu/SCF * kg of CO2 emitted per MMBtu burned * 0.001 [converts SCF to MSCF] * 0.001 [converts kg to Tonne] * Years of Operation * Methane Percentage |
| — Carbon Credits Cost | Flared Emissions (tonne) * Carbon Credit Cost (/tonne) |
| Vented Emissions (Tonne of CO2e) | Steady State Gas Consumption (SCFM) * (60*24*365/1000) [converts SCFM to annual MSCF] * Gas Density (kg/m3) * 0.02832 [converts kg/m3 to kg/ft3] * Global Warming Potential * Years of Operation * Methane Percentage |
| — Carbon Credits Cost | Vented Emissions (tonne) * Carbon Credits Cost (/tonne) |
| Additional Equations | |
| 1 Gas Sizing Factor | square root (
relative density of natural gas to air2
)* (operating temperature / operating pressure) * (standard pressure / standard temperature) Standard pressure = 1.0133 bars Standard temperature = 293.15 K |
| 2 Relative Density | gas density / atmosphere density |
Change Settings • Definitions • Formulas • About This Tool
© 2011 Emerson Electric Co. All rights reserved.