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GETTING ASSISTANCE |
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Air—Stacks & Vents |
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GETTING ASSISTANCE |
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Air—Stacks & Vents |
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Stacks & Vents
Stacks & Vents Association
Stacks & Vents Association Grid
Forms: GI-04-R/GI-04
This page allows you to edit and add information for stacks and vents at your facility. Answer the question “Are there Stacks or Vents at this facility?” If the answer is Yes, you may not continue until all mandatory fields are entered. Any SI removed during the e-Service process will not require entries in otherwise mandatory fields.
Note: This service does not have a point where you are prompted to provide changes to groups in your permit. If you have changes to permit groups, you may upload an “other” type document describing group changes when you reach the Attachments screen.
Required fields for Stacks & Vents page if you answered Yes+:
+ Any SI removed during the e-Service process will not require the fields listed above.
*Required only if Inside Diameter is not populated
Click Add New Record to add information for a new stack/vent. You may edit some information in existing rows. These are rows that have been populated by data you have entered previously.
Click Delete Record to erase a row that you have added. You may not delete existing rows (rows that you have not added during this application process). Instead, you may change the status to Inactive and provide a removed date.
Reason for changes/modifications — If you edit existing information, you must provide a reason in the text field below the table. This field allows up to 2,000 characters.
Click Next Record to go to the next stack/vent. This action will take you away from the current page after all mandatory fields are entered. You will not be able to move to the next subject item if you are currently viewing the last item.
Click Previous Record to go back to the previous stack/vent. This action will take you away from the current page after all mandatory fields are entered. You will not be able to view the previous subject item if you are currently viewing the first item.
Stack/Vent ID — For new stacks/vents (S/V), the service will list “new” as the ID number. You will need to assign an ID for the purposes of this application process. Any ID you assign will most likely be different when the permit is issued. Assign a new and unique ID number to each additional S/V. If the S/V replaces another S/V that has been removed, assign a new number; do not reuse numbers. S/V ID numbers must be the same as shown on the Process Flow Diagram and must be used consistently throughout the application. This field allows a maximum of 50 characters.
ID numbers must be unique within your service. For example, you may not use the ID “0061” for an emission unit and “0061” for a stack/vent. You could, instead, choose the ID “0061” for the emission unit and “Stack/Vent 0061” for the stack/vent.
If you have modeled your facility, S/V information must match the models.
Stacks or vents from buildings or room ventilation systems whose design basis is the removal of airborne contaminants must be listed individually with an estimate of air flow rate, temperature and emission rate of each contaminant which is a regulated air pollutant.
Stacks and vents from building and room ventilation systems which are designed only to provide fresh air for the occupants or to remove heat for comfort are not required to be listed, unless processes inside that building have emissions that could escape through these vents (e.g., are not vented directly to their own stack so their emissions leave through general building ventilation). All such stacks and vents for each building may be grouped under a single S/V ID number. Provide an estimate of the total air flow and temperature. In some cases, you may want to group these stacks or vents by rooms within a building. You may also list these stacks and vents individually if you wish.
Operators Description — Provide a short description sufficient to identify this stack/vent at the facility, for example, "boiler exhaust" or “dryer emissions.” You may also include any identifying numbers that you use for the stacks or vents (this will be separate from the number stack/vent ID). This field allows a maximum of 200 characters.
Height from Ground — The height is from the top of the stack to nearest ground level. The allowable values range from 0.1 - 9,999.99.
Inside Diameter (ft). — This is the diameter at the top/exit of the stack/vent. The allowable values range from 0.1 - 9,999.99.
Length (ft). — This is measured from the base of the stack/vent on the building roof to the top of the stack/vent. The allowable values range from 0.1 - 9,999.99.
Width (ft). — Provide the inside dimension(s) of the stack at the exit. The allowable values range from 0.1 - 9,999.99
Design flow rate (cubic ft/min) and Exit Gas Temperature at Exit (°F) — This is the air flow and temperature at the top/exit of the stack/vent to the outside ambient air.
You must use the same source of data for both if these items, for instance, if you contact the manufacturer for the flow rate, have them provide the temperature, also. Provide the design flow rate in actual cubic feet per minute and the temperature in degrees F corresponding to the flow rate from this stack. This data should be based on the stationary source(s) operating at its maximum design capacity. If this information is not known or documented, consult the following guidance (below).
Acceptable sources for this information are stack tests if there is no introduction of air or other process gases downstream of the test ports, manufacturer's estimates based on engineering calculations, or your own estimates based on engineering calculations. The allowable values range from 0.1 - 999,999.99
Discharge Direction — Provide the direction of flow of the gases exiting the stack or vent using the following:
Status — Select either Active/Existing or Inactive/Retired from the drop-down list. If status is inactive/retired, provide a removal date.
Removed Date — Required if the Status is Inactive/Retired. Provide the date that the tank was removed. The format for the date is MM/DD/YYYY. The allowable values range from 01/01/1900-12/31/3000.
Click Continue to access the Stacks & Vents Association page.
Instructions for Determining or Estimating Stack Flow rate and Exit Temperature for GI-04
Under each type of equipment or emission unit, several methods of estimating flow rate and temperature may be given. The first method is the most preferred and should provide the most accurate data, but the other methods are also acceptable.
1. Boilers and other equipment burning common fuels
1.1 Preferred method — Determine the maximum rate at which each fuel can be burned based on the overall facility design, and contact the equipment manufacturer for the stack flow rate and temperature at that fuel-burning rate.
1.2 Alternate method — Calculate the stack flow rate using the following procedure:
For each fuel, obtain an analysis (ultimate analysis) for weight fraction carbon (C), hydrogen (H), sulfur (S), nitrogen (N), oxygen (O) and fuel moisture to two decimal places (e.g., 0.86C, 0.14H). For common commercial fuels such as fuel oils sold as Grades 1, 2, 4, 5, or 6, typical analyses in engineering handbooks are acceptable. For other fuels, consult your supplier or have a laboratory perform an ultimate analysis.
Obtain the manufacturer's recommended excess air for that fuel or use the following:
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Fuel |
Excess Air |
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Fuel oil, distillate |
25 (%) |
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Fuel oil, residual |
35 (%) |
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Natural gas |
10 (%) |
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Wood |
50 (%) |
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Coal |
50 (%) |
Calculate the minimum amount of oxygen to burn a unit weight of fuel using the following equation:
Min O2 = 2.66 x C + 8.0 x H + S – O
where C, H, S and O are the weight fractions of carbon, hydrogen, sulfur and oxygen in the fuel.
Calculate total oxygen from:
Total O2 = (1 + E/100) x Min O2
where E is the percentage excess air.
Complete the following:
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Fuel Analysis by weight |
Combustion Products, weight per unit fuel weight |
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Fuel weight fraction carbon, C = |
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→ |
3.67 x C = CO2 = |
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Fuel weight fraction hydrogen, H = |
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→ |
9.0 x H + fuel moisture = H2O = |
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Fuel weight fraction sulfur, S = |
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→ |
2.0 x S = SO2 = |
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Fuel weight fraction nitrogen, N = |
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→ |
3.25 x total O2 + N = N2 = |
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(E/100) x Min O2 = O2 = |
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Total Weight of products per unit weight of fuel |
Sum of the above = |
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Calculate the volume of combustion products at standard conditions by multiplying the sum by 13.33:
V, std. conditions = 13.33 x Sum
Correct this volume to actual stack temperature as follows:
V, actual = V, std. conditions x (stack temperature + 460) / 528, temperature in degrees F
where: V, actual is volume in cubic feet per unit weight of fuel burned.
Calculate the stack flow rate by multiplying V, actual by the maximum fuel combustion rate in pounds per hour. Maximum fuel combustion rate can be obtained from the manufacturer or by dividing the rated nameplate heat input by the heat value of the fuel per pound.
1.3 Alternate method — Performance test data
Performance test data may be used to provide flow rate and temperature. If the test is not conducted at the design fuel-burning rate, the measured flow rate may need to be extrapolated to the design condition.
2. Fan-powered ventilation systems
2.1 Preferred method — Consult purchase documents for the fan specifications which will usually specify the volumetric flow rate of air for which the fan is designed. If the air is cleaned by a baghouse, scrubber, cyclone or other air pollution control equipment, the purchase documents for that equipment will usually specify the design gas flow rate. If both are available, the smaller number should be reported.
2.2 Alternate method — Measure the air volume in a straight run of duct using a pitot tube and U.S. Environmental Protection Agency (EPA) Method 1 and 2. Stack tests already performed are adequate if conducted at the design conditions. EPA test methods are found in the Appendices to 40 CFR pt. 60.
2.3 Alternate method — Determine the fan model number from the manufacturer's nameplate and speed from the motor and drive, and measure the static pressure at the fan inlet. Consult the manufacturer's performance curve for the fan, or call the manufacturer to determine the fan performance.
2.4 Last-resort-method for flow rate — Multiply the cross-sectional area of the fan outlet or exhaust stack, in square feet, by 4,000 feet per minute.
3. Natural draft ventilation systems
3.1 Natural draft ventilation systems usually consist of roof openings with a weather hood designed to facilitate exhaust of indoor air due to temperature difference (the indoor air is usually warmer) and may be assisted by wind. Obtain the manufacturer's model number from purchasing records if available or from nameplates if accessible and contact the manufacturer for estimated air flow. If the name of the architect or engineering company that designed the building is still available, they may have design calculations of the required ventilation flow rate.
TopThis page is display only for existing associations from Tempo. Information cannot be edited on this page. You can edit content on the Stacks & Vents Association Grid page.
Click Add Association to add associations. You will be directed to the Stacks & Vents Association Grid page.
Click any hyperlinked subject item ID to edit information for subject items. You will be directed to the Stacks & Vents Association Grid page.
Click Continue to access the Monitor Information page.
TopNote:If you are submitting an administrative amendment, you only need to provide association information about stacks and vents affected by the amendment. Make sure to only select a Subject Item from the drop-down that is affected by your amendment.
Each stack/vent must be associated with a subject item.
Subject Item — This drop-down box should contain the subject item (EU, CE, etc.) you wish to associate with a stack/vent.
% Flow — If all emissions flow to one stack/vent, this will be 100. If this is a bypass stack/vent, list 0% and enter bypass in the Comments field. The allowable values range from 0.00 – 100.0. Do not use the % sign when entering % flow.
Stack/Vent ID — Select the stack/vent from the drop-down list that the selected subject item vents to. If the stack/vent you wish to select is not present, first save any progress you have made. Then, navigate to the appropriate page (most likely the Stacks and Vents page) via the navigation panel on the left and make sure that the stack/vent is added there.
Stack/Vent Association Start Date — Provide the date on which the subject item began venting to this stack/vent. The format for the date is MM/DD/YYYY. The allowable values range from 01/01/1900-12/31/3000.
Stack/Vent Association End Date — Provide the date on which the subject item stopped venting to this stack/vent. The format for the date is MM/DD/YYYY. The allowable values range from 01/01/1900-12/31/3000.
Comments — Use this section to provide clarifications/explanations as needed, such as whether the stack/vent is a bypass. This field allows up to 250 characters.
It is mandatory to have an association row for each stack/vent entered previously. The stack/vent associations are only populated for one stack/vent at a time.
Click Next to go to the next stack/vent. This action will take you away from the current page after all mandatory fields are entered. You will not be able to move to the next subject item if you are currently viewing the last item.
Click Previous to go back to the previous stack/vent. This action will take you away from the current page after all mandatory fields are entered. You will not be able to view the previous subject item if you are currently viewing the first item.
Click the Delete icon to erase a row that you have added. You may not delete existing rows (rows that you have not added during this application process).
Required fields for this page+:
+ Any SI removed during the e-Service process will not require the fields listed above.
You may not continue until all mandatory fields are entered.
Click Continue to access the Monitor Information page.
TopTo contact MPCA e-Services, email onlineservices.pca@state.mn.us or call 651-757-2728 or 1-844-828-0942, 8:00 a.m. to 4:00 p.m. CST, Monday through Friday.
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6/6/2024