CASE-145 · Engineering case

Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit

Documented and accepted refrigeration system with corrected safeguards, verified relief protection, closed MI findings, reduced charge, and operating ownership.

Why the Work Mattered

Purpose and Operating Need

Selected Safety-critical V-model with MOC/PSSR gates at Very high / urgent but gated effort and Urgent / gated speed; sequenced as Wave 1.

Engineering Approach

The refrigeration project covered P&ID recovery, field walkdown, charge calculation, IIAR 9 evaluation, machinery-room safety, relief and mechanical-integrity work, glycol/controls review, PM alignment, MOC/PSSR, testing, training, as-builts, startup and turnover.

Outcome & Engineering Context

Outcome and Context

Delivered the ammonia/glycol refrigeration system through accepted operational turnover and closeout. Owned the full project lifecycle

Workstream Results & Impact

Workstream Portfolio Rollup

5,695,000 USD

Environmental Compliance and Recovery Systems

Recorded workstream portfolio reference. This is the workstream-level value and is not a project expenditure or a new total of reassigned projects.

Measures & Operating Detail

Measure	Value	Type & meaning	Attribution & operating context
Forecast Variance to Budget	18,000 USD	Scenario or Model Result Forecast variance	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Portfolio project register — Budget less estimate at completion; distinct from the difference between budget and final actual cost.
Pre-Project Charge Estimate	11,600 lb NH3	Estimate Planning estimate	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Before field verification — Pre-project undocumented planning estimate
Field-Verified Installed Charge	10,800 lb NH3	Baseline Field-verified calculation	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Before Phase1–6 corrections — Field-verified calculated installed charge
Charge After Dead-Leg and Isolation Corrections	10,152 lb NH3	Observation Recorded condition	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit After Phase1–6 corrections — Documented charge after Phase 1-6 dead-leg/isolation corrections
Charge Reduction Through Dead-Leg and Isolation Corrections	648 lb NH3	Actual Result Achieved reduction	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Phase1–6 — Charge reduction achieved through Phase 1-6 corrections
Candidate Charge Reduction from Full Glycol-Conversion Option	2,400 lb NH3	Scenario or Model Result Potential reduction	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Full Phase7 option — Full Phase 7 candidate reduction if later executed
Potential Final Charge After Full Phase7 Execution	7,752 lb NH3	Scenario or Model Result Potential future charge	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Full Phase7 option — Potential final charge after full Phase 7 execution
Refrigeration P&ID Sheets Issued or Revised	12 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Refrigeration P&ID sheets issued or revised
P&ID Verification Items	250 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — P&ID verification items
Equipment Register Entries	42 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Equipment register entries
Vessel/Nameplate Records	14 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Vessel/nameplate records
Valve and Tag List Entries	200 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Valve and tag list entries
Relief and Hydrostatic Relief Devices	40 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Relief and hydrostatic relief devices
Ammonia Detectors	9 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Ammonia detectors
Horn/Strobe/Alarm Devices	11 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Horn/strobe/alarm devices
Emergency Ventilation and Shutdown Switches	4 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Emergency ventilation and shutdown switches
Critical Valve Maps	7 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Critical valve maps
Pipe Labels, Flow Arrows, Equipment Tags, Warning Signs	320 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Pipe labels, flow arrows, equipment tags, warning signs
Mechanical-Integrity Findings	80 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Mechanical-integrity findings
Condenser/Access/Guarding Findings	18 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Condenser/access/guarding findings
Updated PM Tasks	50 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Updated PM tasks
Controls I/O and Alarm Points Touched	96 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Controls I/O and alarm points touched
Cause-and-Effect / Alarm-Response Test Paths	50 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Cause-and-effect / alarm-response test paths
MOC Records	20 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — MOC records
PSSR Records	8 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — PSSR records
Personnel Requiring Training	40 count	Scope or Inventory Quantity Field quantity basis	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Refrigeration retrofit scope — Personnel requiring training
Reduced Unplanned Refrigeration Interruptions	78,000 USD/year	Scenario or Model Result Annual benefit component	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 12 avoided hours ×6,500USD/hour
Reduced Unplanned Refrigeration Interruptions — Quantity	12 avoided hours/year	Scenario or Model Result Annualized benefit calculation input	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 12 avoided hours ×6,500USD/hour
Reduced Unplanned Refrigeration Interruptions — Unit Rate	6,500 USD/hour	Scenario or Model Result Benefit calculation input	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 12 avoided hours ×6,500USD/hour
Avoided Emergency Contractor Call-Outs	34,000 USD/year	Scenario or Model Result Annual benefit component	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 8 avoided call-outs ×4,250USD/call-out
Avoided Emergency Contractor Call-Outs — Quantity	8 avoided call-outs/year	Scenario or Model Result Annualized benefit calculation input	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 8 avoided call-outs ×4,250USD/call-out
Avoided Emergency Contractor Call-Outs — Unit Rate	4,250 USD/call-out	Scenario or Model Result Benefit calculation input	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 8 avoided call-outs ×4,250USD/call-out
Reduced PM and Troubleshooting Labor	16,900 USD/year	Scenario or Model Result Annual benefit component	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 260hours ×65USD/hour
Reduced PM and Troubleshooting Labor — Quantity	260 hours/year	Scenario or Model Result Annualized benefit calculation input	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 260hours ×65USD/hour
Reduced PM and Troubleshooting Labor — Unit Rate	65 USD/hour	Scenario or Model Result Benefit calculation input	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 260hours ×65USD/hour
Insurance/Loss-Control/Compliance Reserve Reduction	35,000 USD/year	Estimate Planning reserve component	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — $35,000/year fixed planning value for insurance, loss-control and compliance reserve reduction within the recorded $178,000 annual avoided-cost calculation.
Reduced Refrigerant Loss and Handling	14,100 USD/year	Scenario or Model Result Annual benefit component	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 300lb ×47USD/lb
Reduced Refrigerant Loss and Handling — Quantity	300 lb/year	Scenario or Model Result Annualized benefit calculation input	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 300lb ×47USD/lb
Reduced Refrigerant Loss and Handling — Unit Rate	47 USD/lb	Scenario or Model Result Benefit calculation input	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — 300lb ×47USD/lb
Total Annual Avoided-Cost Benefit	178,000 USD/year	Scenario or Model Result Recorded annual avoided-cost calculation	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Annualized benefit calculation — Portfolio-recorded annual avoided-cost benefit of $178,000 combines $143,000 in interruption, contractor, labor and refrigerant benefit calculations with a $35,000 fixed planning reserve component. The portfolio describes the aggregate as actual benefit; the total therefore retains its mixed calculation and planning basis rather than representing $178,000 of realized cash savings.
Simple Payback	5.056179775280899 years	Scenario or Model Result Calculated payback	Applies to: Ammonia/Glycol Refrigeration Safety, Compliance, and Mechanical-Integrity Retrofit Installed-cost basis divided by annual benefit — Calculated simple payback: $900,000 budgeted installed-cost basis divided by the $178,000/year avoided-cost calculation equals 450/89 years (about 5.056). The denominator includes the $35,000 planning reserve component; this is not an observed payback period.

Engineering scope and design basis

Delivered Ammonia/glycol refrigeration system through accepted operational turnover and closeout.

Food ingredients manufacturer Capital Project Engineer; owning workstream PG-B-07; authority VP Operations. Owned the full project lifecycle

2019-01-01 to 2020-02-29; budget $900,000; forecast variance (budget less EAC) $18,000.

Delivered refrigeration scope included P&ID recovery, field walkdown, charge calculation, IIAR 9 evaluation, machinery-room life safety, relief validation, mechanical-integrity restoration, glycol review, controls and interlocks, PM alignment, MOC/PSSR, testing, training, as-builts, startup, and turnover.

The complete refrigeration project history covers documentation recovery, field corrections, safeguards, relief and mechanical-integrity work, alarm testing, PM alignment, MOC/PSSR, training, startup, as-builts and turnover.

Applied requirements traceability, WBS/schedule, cost/resources, baselines and risk/change controls through transition; the complete project history also includes successor commissioning, training and G9 ownership transfer.

Physical separation of refrigerant and product areas; leak detection; ventilation; drainage; hygienic insulation and penetration repair; controlled defrost and condensate; product-impact assessment; area isolation and cleaning release; alarm/interlock verification; MOC/PSSR; operator response; documented turnover.

76 controlled project documents across nine lifecycle phases, 362 linked execution records, accepted G1-G9 gates, and final baseline PRJ-B-008-BL-OT-B01.

OPERATIONAL / CLOSED; 648 lb NH3 reduction; 250 P&ID items; 40 relief devices; 9 detectors; 50 alarm paths

Operations received Ammonia/glycol refrigeration system with accepted configuration, procedures, training, asset and maintenance records, residual-item disposition, and ownership.

Delivered Ammonia/glycol refrigeration system, measured by 648 lb NH3 reduction; 250 P&ID items; 40 relief devices; 9 detectors; 50 alarm paths; operational turnover completed, by executing Safety-critical V-model with MOC/PSSR gates from concept through G9 closeout. Owned the full project lifecycle

Actions, Methods & Controls

ACTIVITIES IN CONTEXT