Editorial Technical Reference

Drip Leg / Condensate Trap

This page explains how Drip Leg / Condensate Trap is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A component in steam distribution systems that collects and removes condensate to prevent water hammer and ensure dry steam delivery.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Drip Leg / Condensate Trap

Definition
A drip leg, also known as a condensate trap, is a vertical pipe section installed at low points in steam distribution systems, such as pipes, nozzles, or spray headers. Its primary function is to collect condensate that forms as steam cools, preventing water hammer and ensuring that only dry steam reaches downstream equipment. The drip leg works in conjunction with a steam trap, which automatically discharges accumulated water while preventing live steam loss. This protects equipment from damage and maintains efficient steam flow. Drip legs are available in carbon steel or stainless steel, with nominal diameters ranging from DN15 to DN50 (ISO 6708). Operating pressure is typically 1.0–1.6 MPa, and operating temperature ranges from -10°C to 200°C. Capacity, measured at 0.5 MPa differential pressure, is 500–3000 kg/h (ISO 6948). Leakage rate is ≤0.05% of capacity, meeting Class VI seat leakage. Body material is WCB for carbon steel or CF8 for stainless steel (ASTM A216/A351). Connections are flanged for DN≥25 and threaded for smaller sizes (ISO 7005). Weight varies from 2.5 to 15 kg depending on size and material. These values are reference ranges; always verify model-specific specifications with the manufacturer or supplier. Proper selection requires consideration of pipe size, condensate load, and system pressure. Regular maintenance includes checking for leaks and ensuring the steam trap operates correctly. Failure to remove condensate can lead to water hammer, which may cause pipe damage or equipment failure. Always consult the manufacturer's documentation for installation and maintenance guidelines.
Working Principle
Condensate flows by gravity into the vertical drip leg due to its lower elevation. The accumulated water is then periodically discharged through a steam trap at the bottom, which opens when condensate is present and closes to prevent steam escape. This maintains steam quality and system pressure.
Common Materials
Carbon Steel, Stainless Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal DiameterDN15–DN50 mmSelect based on pipe size and condensate load.ISO 6708
Operating Temperature-10–200 °CAbove 200°C requires high-temperature gaskets.
Capacity500–3000 kg/hAt 0.5 MPa differential pressure.ISO 6948
Leakage Rate≤0.05 % of capacityClass VI seat leakage.
Body MaterialWCB/CF8WCB for carbon steel, CF8 for stainless.ASTM A216/A351
Connection TypeFlanged/ThreadedFlanged for DN≥25, threaded for smaller.ISO 7005
Weight2.5–15 kgDepends on size and material.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Vertical Pipe Section Part
    Collects condensate via gravity separation from steam flow.
    Material: Carbon Steel
  • Steam Trap Connection Part
    Interface for attaching a steam trap to discharge condensate.
    Material: Carbon Steel
  • Drain Valve
    Manual valve for maintenance draining or blowdown.
    Material: Bronze or Stainless Steel
  • Steam Trap
    Opens when condensate collects and shuts before steam escapes — the working half of this product.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Drip Leg / Condensate Trap.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 25 bar (360 psi)
other spec: Flow Rate: 0.1-10 m³/h, Slurry Concentration: <5% solids by weight
temperature: -20°C to 200°C
Media Compatibility
✓ Saturated Steam Systems ✓ Compressed Air Lines ✓ Natural Gas Pipelines
Unsuitable: Corrosive Chemical Slurries with high particulate concentration
Sizing Data Required
  • Steam/Flow Rate (kg/h or m³/h)
  • Operating Pressure (bar/psi)
  • Pipe Diameter/Connection Size (inches/mm)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Corrosion-induced leakage
Cause: Exposure to acidic condensate (pH < 6) from steam systems, particularly in systems with poor water treatment or oxygen ingress, leading to wall thinning and eventual perforation.
Sediment blockage
Cause: Accumulation of scale, rust particles, or debris from upstream piping, preventing condensate drainage and causing water hammer or backflow into steam lines.
Maintenance Indicators
  • Visible water leakage or rust stains around the trap body or connections
  • Audible water hammer (banging) in adjacent piping or irregular condensate discharge patterns
Engineering Tips
  • Install a strainer upstream of the trap and implement regular blowdown procedures to remove sediment before it reaches the trap chamber
  • Use corrosion-resistant materials (e.g., stainless steel) for the trap body in systems with known acidic condensate, and monitor condensate pH as part of routine water treatment checks

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASME B31.3 (Process Piping) EN 10204 (Material Certification)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/- 0.02 mm
  • Flatness of sealing surfaces: 0.1 mm
Quality Inspection
  • Hydrostatic Pressure Test
  • Dye Penetrant Test for weld integrity

Manufacturers of Drip Leg / Condensate Trap

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Chinafore
Hangzhou, Zhejiang, CN
Founded 2003250+ staff50,000 square meters
ISO 9001 ISO 14001
Also makes: Condensate Pump, Ductwork System, Flexible Duct and 4 more
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Frequently Asked Questions

What is the purpose of a drip leg in a steam system?

A drip leg collects condensate that forms when steam cools, preventing water hammer and ensuring dry steam reaches downstream equipment. It works with a steam trap to automatically drain water while preventing steam loss.

How do I select the correct drip leg size?

Selection is based on pipe size and condensate load. The nominal diameter range is DN15–DN50 (ISO 6708). Consider the system's operating pressure and temperature, and verify capacity requirements with the manufacturer.

What materials are available for drip legs?

Drip legs are available in carbon steel (body material WCB) or stainless steel (body material CF8), per ASTM A216/A351. Choose based on the application's corrosion and temperature requirements.

How often should a drip leg be maintained?

Regular inspection is recommended to ensure the steam trap is functioning and no leaks are present. Maintenance frequency depends on system conditions; follow the manufacturer's guidelines and check for signs of water hammer or reduced steam quality.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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