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KSB Inverted Bucket Steam Trap SIB-S

ECOLINE SIB-S with open bucket design for continuous air venting. Top-serviceable without removing from pipeline. Cast iron up to 17.5 bar / 260°C, cast steel up to 42 bar / 425°C. Sizes ½″ to 2″. The most robust steam trap type for sugar factories and power plants.

Inverted Bucket Steam TrapCI 17.5 bar / CS 42 barSizes ½″ to 2″

Specifications

ParameterSpecification
SeriesECOLINE SIB-S
Body MaterialCast Iron (ASTM A48 Class 30) or Cast Steel (ASTM A216 WCB)
Size Range½″ to 2″ (DN 15 to DN 50)
Max Pressure (CI)17.5 bar @ 260°C
Max Pressure (CS)42 bar @ 425°C
Max Temperature (CI)260°C
Max Temperature (CS)425°C
Design StandardKSB Manufacturer Standard
End ConnectionsScrewed (NPT/BSP); Socket Weld (CS only)
ConstructionHorizontal type (vertical on request); top-serviceable internals; open bucket design with continuous air vent
Trim / InternalsSS 304 lever, bucket, guide pins; AISI 440B/C valve and seat (CI); chrome steel valve and seat (CS)
✓ KSB proprietary

Material & Applications

Why Multi-Material Inverted Bucket: The inverted bucket is the most robust and reliable steam trap mechanism. The open bucket design provides continuous air venting (critical during plant startup when lines are full of air). Top-serviceable design allows maintenance without disconnecting the trap from the pipeline — simply unbolt the top cover, lift out the internals, service or replace, and reassemble. This reduces maintenance time from hours to minutes.

Typical applications: Sugar factory evaporators, juice heaters, vacuum pans, boiler auxiliaries, drip legs, steam tracing. Power plant condensate recovery, process heating. A single failed steam trap can waste 25–50 kg/hr of live steam — a typical sugar factory with 50–100 traps can lose 5–15% of total fuel consumption through failed traps.

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Other Variants

Ball Float SBF-S Thermodynamic STH-S All Steam Traps →

Service Area

Pune, Ahmednagar & Beed.

Multi-Material Inverted Bucket Steam Trap FAQs

Why inverted bucket for sugar factories?
Sugar factories have intermittent steam loads (crushing season only), frequent startups and shutdowns, and condensate that often contains sugar residue. Inverted bucket traps handle all these conditions better than thermodynamic or ball float types. The open bucket vents air continuously during startup, which is critical for efficient heat transfer in juice heaters and evaporators.
How much steam does a failed trap waste?
A stuck-open steam trap can waste 25–50 kg/hr of live steam depending on trap size and operating pressure. In a typical sugar factory with 50–100 steam traps, failed traps can waste 5–15% of total fuel consumption. A comprehensive steam trap audit with identification and replacement of failed traps typically pays for itself within one crushing season through fuel savings.
What body material for sugar factories?
For SIB-S inverted bucket, KSB offers two body materials per the ECOLINE catalogue: cast iron (ASTM A48 Class 30) rated to 17.5 bar / 260°C for low-pressure utility service, and cast steel (ASTM A216 WCB) rated to 42 bar / 425°C for medium-pressure boiler and process steam. Sugar factory boiler headers typically operate at 21–32 bar, so cast steel is the standard specification. For higher pressures or temperatures than SIB-S supports, the STH-S thermodynamic trap in WC6 or F22 alloy steel is the alternative.
How often should steam traps be inspected?
At minimum, annually. Best practice is a complete steam trap survey before each crushing season (for sugar factories) or during each planned shutdown (for power plants). KSB and Johar Engineering offer steam trap audit services with detailed reports identifying failed traps and quantifying steam losses.

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