Exhaust Heat Recovery Units


Exhaust Heat Recovery Units (ESG1’s)

Since our company started in 1974, H. Ertel Inc. has been helping customers increase the efficiency of their engine & turbine-driven generator sets by recovering heat from jacket H20, intercoolers, lube oil and exhaust gas. Cain Industries offers both liquid type (typically ethylene-glycol-H20 or propylene-glycol-H20) and steam generating EHRU’s.

These operate in waste exhaust temperatures from 350° F-1900° F.
Fuels: natural gas, landfill gas, bio-gas, #2 & #6 fuel oils and coal
Volume flow rates: 20 – 50,000 SCFM with 300,000,000 BTU/hour input maximum.

For ESG1 steam generating type, Cain offers 48 pre-engineered models with output from 20 – 500 boiler HP and operating steam pressures from 3 – 450 PSIG. On engine exhaust applications, this covers 400KW – 7 MW. All ESG1 are designed, manufactured and stamped in accordance with Section 1 of ASME Boiler and Pressure Vessel Code and National Board.

All ESG1 units include:

  • Welded or brazed fin tube heat transfer section (H20 tube type) with main inspection door for tube removal and main inspection access port for cleaning and/or inspection, individual serpentine, removable tube rows for ease of cleaning. Reinforced Enclosure With 304 S.S. Baffles and 4″ Minimum Thickness Insulation; Gas-Tight 10 GA. Carbon Steel Shell.
  • Integral steam flash circulating drum assembly, with 1″ insulation which produces 99% dry steam. Automatic modulating (to maintain constant Steam Discharge Pressure), full port exhaust bypass system with S.S. damper & shaft, with external high temperature bearings and packing glands to minimize leakage.
  • ANSI standard hot H20 circulating pump w/ TEFC motor & mechanical seal to maintain high H20 flow & minimum fouling.
  • Main drum Blowdown Valve Assembly, Continuous Surface Blow-Down Valve, H20 Level Control Blowdown Valve—all Manifolded To Single Blowdown Connection.
  • Safety Controls include: High/Low Level H20 Cutout, Excess Steam Pressure Cutout, Low Air Pressure Cutouts for Pneumatic Exhaust Bypass Actuator, ASME & Nat. Board Stamped Steam Safety Relief valve
  • H20 Level Control System w. fully modulating Boiler Feedwater Pump level control and valve assembly w/ boiler feedwater on/off auxiliary switch. H20 level Sightglass, Drain cock, Gauges for Steam,
    Feedwater, Pump Cooling H20, and Air Indication are provided on Skid-mounted, all inter-piped and valved, Plug & Play Assembly
  • NEMA 12 Control Panel for (1) Main power connection, with Main Fuse Disconnect and Starter, Fuse-protected stepdown Transformer, Power & Run Indication Lights, Low & High H20 Alarm Lights &
    Low Air & Excess Steam Pressure Alarm Lights
  • All units Hydro-Tested, all components and electrical controls tested Prior to shipment
  • Can be installed Outdoors with Optional Weather-proof, Insulated Enclosure


Liquid EHRU’s, (UTR, UTR1, HRSA, HRSR’s)

Liquid type Exhaust Heat Recovery Units are used in Heat Sink types:
Engine Jacket Water, Ethylene-Glycol/H20, Propylene Glycol-H20, Process H20 and Boiler H20. Either full-counterflow, Round HRSA, (15-150 KW), or Rectangular UTR, (15-300 KW), are Ideal for Under Hood or Enclosed, “Low Profile” Engine Exhaust applications.

The HRSA features:

    • Optional fixed or removable spiral fin-tube bundle for ease of inspection and cleaning
    • Optional Stainless Steel Shell and/or Internal Insulation
    • Optional Internal or External Exhaust Bypass, Stainless Steel Diverter Drum
    • Vertical or Horizontal Condensate Drain
    • Mounting Brackets for Vertical or Horizontal Installation
    • Optional ASME Code Stamp
    • (65) Standard Models
    • “Residential” 25 dBA level Exhaust Noise Attenuation
    • Optional compact Circulating Pump for Secondary Liquid Flow System with 1″ NPT Interconnecting Piping to & from Main Liquid Flow loop

The UTR features:

      • (44) Standard Models with Flexible Exhaust Gas Connections & Sizes
      • Core Removable without disturbing Exhaust Gas Connections; for

Easy Inspection & Cleaning of Gas & Liquid sides

  • Optional Exterior Exhaust Gas Bypass & Modulating Actuator Assembly
  • SA178 Boiler Tubing is standard with .25″ thick high-grade Carbon Steel shell
  • Optional All Stainless Steel Fin-tubes for applications where Gas exceeds 1250 Deg.F and Liquids are Under 120 Deg.F
  • Stainless Steel lined Interior w/ 1″, 2″ or 4″ Optional Internal Insulation
  • Optional 1″ NPT Condensate Drain
  • Welded-on Handles to assist in Easy Bundle Removal

For applications on medium and high KW or HP engines & processes, Cain Industries offers Great Flexibility; and designs with & w/o Exhaust Bypass, in Vertical or Horizontal configurations, some with Optional Liquid Temperature Control and Manual or Automatic Diverter.

The UTR1 features:

    • Over (170) Standard Configurations, Highest Heat Transfer, (10 MW), in Minimum Required Space, Optional ASME Code Stamp
    • “Parallel” piping arrangement for High Liquid Flow vs. “Series” piping arrangement for Lowest flows
    • Internal Factory Insulation, 2″ – 6″ Thick is Optional
    • Locatable Above engine or on Floor to fit Least Available Space
    • Easy Access of Fin-Tube Bundle allows Quick Removal of Finned

Tube Rows or Core Assemblies without Disturbing Exhaust Connections. Makes Inspection & Cleaning Routine to Minimize
Maintenance Cost and Maximize Heat Recovery Efficiency and Profit!

    • Optional Inspection Door with Welded-on Handles
    • 10 Gauge Carbon Steel Shell, Seam-welded
    • H-Beam Support Base
    • Optional 1-1/2″ NPT Condensate Cleanout Drain
    • ¾” NPT Vent and Lifting Lugs are Standard
    • Fin-tube “Rack-out” Serpentine Rows for Easy Removal

& Handling & Cleaning

  • Optional Square to Round Exhaust Duct Transition Pieces
  • Optional, Rotating Soot Blowers, Automatic or Manual
  • Fin-tube spacings Available from Bare Tube Up thru 8 Fins Per Inch

On Applications where Integral Exhaust Bypass is Needed, the HRSR Is the Most Advantageous, Complete Assembly on the Market—and the Most Versatile.

The HRSR features:

    • Optional ASME Code Section VIII “U”, “UM” “S”, National Board Registered, CRN and/or CSA
    • Single row Tube Configuration for Easiest Cleaning
    • Integral Exhaust Diverter w/ S.S. Damper Shaft & Blade
    • Outboard Mounted Bearing to Reduce Temperature, Prolong Life
    • H-Beam Support with Vertical Configuration Standard for Minimum Foot-print, with standard Lifting Lugs
    • No Need for Crane, (2) Men for Heavy Bundle Removal to Clean
    • Modulating Actuator, (optional Pneumatic or Electric)
    • 10 Gauge Thick Carbon Steel Exterior, w/ 304 S.S. Internal Lining
    • Thermocouple & ¾” Vent
    • Header Manifold for LOW Liquid Pressure Drop, (< 2 PSI Typical)
    • Multi-pass, Counter-flow for Highest Efficiency & Performance
    • Optional Hinged Access Door with Handle for Ease of Fin-tube

Inspection & Removal & Cleaning to Maintain Maximum Heat Recovery and R.O.I.

    • Optional NEMA 12 Control Panel used with Timed Soot Blower and Liquid Temperature Control
    • Manual Bypass Adjusting Plate and Arm Assembly to Lock Damper In Desired Position
    • Optional Horizontal Configuration for Roof-top & Low Profile Applications
    • Optional Removable “Swagelok” Compression Fittings for Speedy

Withdrawal and Inspection/Cleaning & Re-Installation

    • Connections Available in Size Required with NPT or Flanged Connections
    • Capacities up thru 6 MW
    • No Tube to Tube or tube to Header joint welds are in contact with

Exhaust Gas to minimize potential for vessel failure

  • Either 80 PSIG Compressed Air or Steam used for Timed Soot Blower
  • Manual or Programmable Automatic Timed Soot Blower
  • Optional “Outdoor” Paint Treatment for Installations Indoors & Outdoors in All Climates
  • Much Lighter & Smaller than Typical “Fire-tube” Bundle type Competitor’s Designs which are Subject to Clogging of Tubes & Dramatic Efficiency Loss due to Build-up after relatively short
    Operating time—and which could experience Explosion with Loss Of Cooling Fluid
  • “Industrial Grade” (10-18 dBA) Exhaust Noise Attenuation