Heat Treatment, Furnaces & Thermal Processing worked example

Furnace Atmosphere Leak Cost at 110% share of leak cost charged to this job: a worked example

Push share of leak cost charged to this job up to 110% and the picture changes. This example computes every intermediate figure at that operating point. Use it when nitrogen, argon, hydrogen blend, endothermic gas, or vacuum backfill usage rises due to seals, doors, piping, or purge leaks.

The inputs for this scenario

  • Excess protective atmosphere gas consumed: 15,000 scf (unchanged)
  • Protective atmosphere gas unit cost: 0.02 $ / scf (unchanged)
  • Share of leak cost charged to this job: 110 % (raised for this scenario; the documented default is 100)
  • Fixed leak repair or purge cost: 650 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Captured atmosphere leak cost = excess gas × gas cost rate × leak cost capture) to the inputs above produces each figure below.
  • At this operating point the engine returns 947 $ for total atmosphere leak cost, the number this scenario is built around.
  • At this operating point the engine returns 0.06 $ / scf for leak cost per scf.
  • At this operating point the engine returns 297 $ for captured excess gas cost.
  • At this operating point the engine returns 650 $ for fixed leak repair or purge cost.

How this compares with the baseline

  • Against the tool's baseline example, where share of leak cost charged to this job sits at 100% and the headline result is 920 $, this scenario comes in 2.93% above the baseline at 947 $.
  • It computes the cost of excess atmosphere gas as excess scf times the gas cost rate times a capture share, then adds any fixed repair or purge cost for a total leak cost. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Total atmosphere leak cost: 947 $ (headline result)
  • Leak cost per scf: 0.06 $ / scf
  • Captured excess gas cost: 297 $
  • Fixed leak repair or purge cost: 650 $

Run it with your numbers

  • Every input above is editable in the live Furnace Atmosphere Leak Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.