Steam Tracing Simplified in Chemical Plants
INTRODUCTION
In big chemical complexes, Steam Tracing keeps lines warm, viscous feeds moving, and instruments safe from freezing. The legacy approach—dozens (or hundreds) of tiny traps on long tracing circuits—creates cold spots, leaks, and endless maintenance rounds in hazardous or hard-to-reach pipe racks.
A cleaner solution is to use one Jetomat Steam Ejector (a controllable Steam Thermocompressor) to Pull Condensate from many tracing lines into a single return header. When condensate is actively removed, all tracers run hot and dry, freeze protection becomes reliable, and your team maintains one device instead of a forest of traps—Saving Energy and downtime.
WHAT IS IT?
A Jetomat is a Steam Thermo Vapour Recompressor with an adjustable Nozzle and Diffuser. Motive steam accelerates through the Nozzle Design, creating a low-pressure zone that entrains low-pressure vapor (and pulls condensate via differential) from the tracing circuits.
In the Diffuser, velocity is converted back into pressure; the Mixed Steam is delivered to a small LP header or flashed to the condensate system.
This is the classic Steam Jet Ejector Working Principle—a momentum-exchange Vapor Compressor / Steam Compressor with no rotating parts.
In tracing service: The Jetomat connects its Suction to a Central Condensate/Flash Manifold from dozens of tracers. It draws the condensate out continuously, so tracers don’t water-log and lose temperature.
COMPONENTS OF TRACING LINE
Controllable Motive Nozzle (with actuator)
Pneumatic or electric actuator moves the spindle to modulate motive mass flow (typical turndown 3:1–5:1).
Holds a constant mixed pressure (or target suction) despite changing weather or process loads.
Suction Header (Tracing Condensate/Flash)
Collects outlets from multiple tracers (e.g., 20–60 lines per cluster).
Short, well-drained branches prevent liquid slugs; header is insulated to keep Flash Steam available.
Mixing Chamber + Diffuser and Nozzle
The jet entrains flash vapor from the header; the Diffuser recovers pressure to the LP target (often 1.5–3.0 bar(g)), or directly into a deaerator/condensate receiver.
Return & Separation
Mixed discharge to an LP header feeding small users or a Condensate and Flash Steam Recovery System.
A compact Steam Separator is optional if a specific instrument demands ultra-dry steam; most tracing loops accept saturated conditions.
Instrumentation & Controls
Primary control on Mixed Pressure or Header (suction) Pressure; ±0.05 bar stability is typical.
Interlocks: low motive pressure, low suction temperature/flow (detect empty header), freeze alarm permissives.
HOW IT WORKS
Typical Site Data
Ambient: −10 to +35 °C; winter design: −5 °C.
Tracing cluster: 40 tracers, each ½″ tube, average Condensate 15 kg/h at winter conditions → 600 kg/h combined.
At outlets, condensate drops to near-atmospheric and creates Flash Steam (≈5–10% by mass).
Jetomat duty: Suction near 0–0.3 bar(g), Motive 8–10 bar(g), Mixed 2.0–2.5 bar(g).
Sizing Snapshot
Available flash (vapor) ≈ 40–60 kg/h; liquid condensate ≈ 540–560 kg/h.
Choose entrainment ratio ( \omega = \dot m_s/\dot m_m ) ≈ 0.6–0.9 (service-dependent).
To keep header “pulled” and tracers dry, the nozzle opens as load rises (colder nights), and closes on warm afternoons—no manual bypassing.
Rule of thumb: Every 1 kg of recovered vapor/flash reused in the LP header Displaces ≈1 kg of fresh steam at that pressure—direct Saving Energy.
What Operators See
Tracer outlet temperature lifts and stays flat (typical spread ±1–2 K along long runs).
No water-logging: continuous differential keeps metal hot; freeze protection is reliable, even at dead legs.
Zero or Minimal Vents: the header is quiet; less “steam haze” around racks.
WHY THIS BEATS “ONE TRAP PER TRACER
TRAPS
Each line has a tiny orifice/thermostatic trap. In wind and rain, small traps cycle and often leak, soaking tracers. You get cold stretches, water hammer, and a maintenance nightmare (finding a failed trap 30 m up in a rack at 2 a.m.).
Jetomat Loop
One ejector creates a Closed, Recirculating effect—actively Removing Condensate from many lines to a central manifold. Fewer components, no cycling, and stable temperatures.
BENEFITS
Thermal Reliability & Freeze Protection
Tracers stay hot and dry; no “cold feet” at the ends.
Stable header conditions deliver Tight Temperature Maintenance on sulfur lines, caustic, polymer feeds, brine instrument lines, etc.
Energy & Utilities
Reuse Flash Steam to an LP header or DA: measurable Fuel Reduction (often 8–15% for traced networks) and smaller Make-Up Water/Chemical bills.
Maintenance & Safety
Replace dozens of traps with One Ejector + a few block/iso valves.
Fewer climbs in pipe racks and classified areas; reduced leak points; easier isolation during turnarounds.
Simplicity & Footprint
The ejector has no rotating parts; actuator is standard plant hardware.
Skid-mounted; fits near condensate receivers or rack bases—minimal civil work.
Process Stability
Thermocompressor Working Principle smooths weather and load swings; ±0.05 bar suction stability keeps film heat transfer up on tracer tubes—practical Heat Transfer Solutions with fewer surprises.
PRACTICAL DESIGN NOTES
Manifold layout: Keep suction branches short; slope them to drain; avoid low pockets. Insulate the header to preserve flash.
Controls: Start with Mixed-Pressure Control; if freeze critical, add Suction-Pressure Trim or ambient feed-forward.
Turndown: Specify 3:1–5:1 motive turndown so nights/weekends stay stable.
Hydraulics: Confirm condensate lift (if any) and allowable Δp to the return; where lift is needed, place the ejector low to help drainage.
Materials: Choose corrosion-resistant metallurgy for amine/acid areas; follow site piping class.
Safety: Non-return on motive steam; slow-opening valve to prevent water hammer; consider a small Steam Separator upstream if motive line is wet.
MINI EXAMPLE—Cold Snap Readiness
Baseline: Cluster of 50 tracers with 50 traps. In a cold snap, ~15% traps fail or under-drain → three heat-trace incidents and a frozen instrument line.
After Jetomat: Traps on that cluster reduced to 3 block/iso points; ejector pulls ~700 kg/h condensate+flash, LP header at 2.0 bar(g).
Outcome: No freeze events; inspection hours for that rack cut by >60%; utility logs show ~10% steam reduction for the traced area over the winter month (driven by recovered flash and eliminated trap leaks).
CONCLUSION
Steam Tracing doesn’t have to mean Hundreds of Traps and constant firefighting.
A Jetomat Steam Jet Thermocompressor creates a central Condensate and Flash Steam Recovery System that keeps tracers hot, simplifies the network, and Saves Energy—all with rugged, compact Steam Equipment and standard controls.
How to proceed
Identify the largest tracing clusters (by meter length or trap count).
Log winter-week data: condensate rates, outlet temperatures, nuisance vents.
Request a Thermocompressor Design (entrainment ratio, compression ratio, Diffuser and Nozzle geometry, turndown, actuator type).
Pilot one rack: trend suction/mixed pressure, tracer temperatures, freeze alarms, and steam use for 2–4 weeks.
Standardize across pipe racks once the numbers confirm stability and savings.