HON Leak - Pumps
Published: 2026-06-24 Revised: 2026-06-24
What this report does
Calculates the pump leak rate for each selected unit for the most recently completed monitoring period under HON (Hazardous Organic NESHAP). The report accounts for leaks found on newly added pumps by subtracting those leaks — and the corresponding monitored pumps — from both the numerator and denominator of the leak rate calculation.
There are no date parameters and no deactivation credit option. The period is determined automatically from the regulation's monitoring schedule. This report is in the Leak folder on the Reports tab.
When to use it
- Verifying pump leak rates at the end of a monitoring period.
- Understanding how newly added pumps are treated in the HON calculation.
- Identifying units with elevated pump leak rates.
Parameters
| Parameter | Description | Required | How it filters |
|---|---|---|---|
| Regulation | The HON regulation to report on | Yes | Only pumps mapped to this regulation are included |
| Unit Type | Whether to filter by Process Unit or Location Unit | Yes | Determines which unit list populates |
| Units | One or more units to include | Yes | One output row per selected unit |
No date parameter and no deactivation credit option. The monitoring period is automatically calculated from the regulation's monitoring schedule. This report does not offer the 0.67 net deactivated credit adjustment available in the valve and connector reports.
Columns
| Column | What it shows | Format / Notes |
|---|---|---|
| Unit | The unit name | Text |
| Monitored | Number of pumps that received an M21 inspection during the period | Integer |
| Denominator | Monitored pumps minus leaks found on newly added pumps | Integer; the adjusted base used for the leak rate calculation |
| Leaks Found | Total number of pump leaks found during the monitoring period | Integer |
| Total Pumps | Total number of active pumps in the unit at the end of the period | Integer |
| Leaks Within Month Added | Number of leaks found on pumps that were added to the system within one month before the leak was found | Integer; these leaks are subtracted from both the numerator and denominator |
| Numerator | Leaks Found minus Leaks Within Month Added | Integer; the adjusted leak count used for the leak rate calculation |
| Leak Rate | Pump leak rate for the period, expressed as a percentage | Decimal (1 decimal place); Numerator ÷ Denominator × 100; shown as 0.0 when Denominator is zero |
| Period Start | First day of the monitoring period | Date |
| Period End | Last day of the monitoring period | Date |
| Frequency | Monitoring frequency assigned to the unit under this regulation | Text; e.g., "Annual", "Semi-Annual" |
What's included and excluded
Included:
- Only pumps (component type Pump) mapped to the selected regulation.
- Only pumps in the selected unit(s).
- Only pumps that received an M21 inspection during the period.
Excluded:
- Non-pump component types.
- Heavy liquid (HL) pumps.
- Exempt pumps.
- Leaks closed with a Mis-Identification close reason.
- Components not mapped to the selected regulation.
How key values are calculated
Monitoring period (auto-calculated)
The report uses the most recently completed monitoring period based on the regulation's monitoring schedule. No date entry is required; the period boundaries appear in the Period Start and Period End columns.
Leaks Within Month Added
A leak is counted as "within month added" when the leak was found (DateOpened) within one month after the pump was first added to the system (DateAdded). These are leaks on brand-new pumps where the pump has been in service for less than a full month — their inclusion in the rate would skew the measurement for an established population.
Denominator and Numerator
Both values subtract leaks within month added:
Denominator = Monitored − Leaks Within Month Added
Numerator = Leaks Found − Leaks Within Month Added
Leak Rate
Leak Rate = (Numerator ÷ Denominator) × 100
Rounded to one decimal place. When the Denominator is zero (for example, when all monitored pumps were newly added and all their leaks fall in the "within month added" category), the Leak Rate is shown as 0.0 rather than being left undefined.
Newly added pumps
Pumps that were added to the unit within one month (30 days) of the start of the reporting period are excluded from both the numerator and the denominator. This reflects the HON regulatory grace period for new equipment — a pump cannot reasonably have established a monitoring baseline in its first month of operation. Leaks found on a newly added pump are excluded from Leaks Found, and the pump itself is excluded from Monitored.
Tips and common questions
- "Why is the leak rate different from what I'd get dividing Leaks Found by Monitored?" The report subtracts newly added pump leaks from both counts. If any pumps in the unit were added within the past month and found to have leaks, those components reduce both the Leaks Found count (Numerator) and the Monitored count (Denominator), resulting in a leak rate that excludes early-service leaks.
- "Why is there no 0.67 deactivation credit option?" The pump report does not include a deactivation credit adjustment. See HON Leak - Valves or HON Leak - Connectors for reports that offer the credit option.
- "Why is there no date parameter?" The report automatically uses the most recently completed monitoring period. The period start and end dates are shown in the output.
- "A unit I selected is not in the output." Units with no monitored pumps mapped to the selected regulation will not produce a row. Confirm that the unit has pump components with the regulation assigned and that M21 inspections occurred during the period.
- "Leaks Within Month Added is unexpectedly high." A spike here may indicate a batch of new pumps were added and found leaking shortly after installation. Review the newly added pumps in the Activated Components report for the same period.
Sample output
Report run for Example Facility, Regulation: HON, Unit Type: Location Unit, Units: Unit A, Main Plant.
What the rows illustrate:
- Unit A — 1 leak was found on a pump added within the past month; it is subtracted from both Leaks Found (2 − 1 = 1 Numerator) and Monitored (12 − 1 = 11 Denominator). Leak Rate = 1 ÷ 11 × 100 = 9.1%.
- Main Plant — No newly added pump leaks (Leaks Within Month Added = 0); Denominator equals Monitored. Leak Rate = 3 ÷ 148 × 100 = 2.0%.
Output format
One row per unit. Suitable for on-screen viewing, PDF, and Excel export.
Related reports
- HON Leak Report — the primary HON leak report; includes full per-component leak detail for all component types.
- HON Leak - Valves — valve rolling average leak rate report; includes the 0.67 deactivation credit and the 1% pre-existing DOR threshold.
- HON Leak - Connectors — connector leak rate report; includes the 0.67 deactivation credit and the 2% pre-existing DOR threshold.
- Activated Components — use to review the newly added pumps whose leaks appear in Leaks Within Month Added