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Application Guide

Valves for Coke Oven & Steel Plants

Integrated steel plants (ISPs) present a unique valve challenge: massive flow volumes of blast furnace gas (BFG) at very low pressure (2,000–5,000 mmWC), highly abrasive and sticky coke oven gas (COG) containing naphthalene and tar, extreme-temperature hot metal and slag systems, and high-pressure steam from waste heat boilers. Vajra Industrial Solutions supplies the specialised valve types required at each stage — knife gate valves for BFG with tar deposits, large-bore butterfly valves on BFG distribution mains, and IBR-certified gate/globe/check valves for the cogeneration steam cycle.

IS 6157 (BFG Gate Valves)ASME B16.34IBR 1950 (Steam)API 600API 609IS 2825ASME B16.10
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Recommended Valve Types for Coke Oven & Steel Plants

Knife Gate Valve

PN 10 / PN 16 (very low pressure BFG)

Why: BFG and COG isolation with sticky tar deposits; full-bore for tar-laden gas; pneumatic actuated for remote operation

Materials: SS316 blade with WCB body; PTFE or NBR seat; easy blade replacement in-situ

Standards: IS 6157, BS 7671, ASME B16.34

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Butterfly Valve (Large Bore)

PN 6 / PN 10

Why: BFG main distribution headers (DN600–DN2400); low pressure, large flow; double-offset for tight shutoff

Materials: WCB body; A351 CF8M disc; EPDM or FKM seat; SS316 shaft

Standards: API 609, EN 593, AWWA C504

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Gate Valve (IBR Steam)

Class 300 / 600

Why: Cogeneration boiler steam headers; TRT (Top Gas Recovery Turbine) steam; IBR Form III mandatory

Materials: A216 WCB (to 425°C), A217 WC6 (to 540°C), A217 WC9 (to 595°C)

Standards: IBR 1950, API 600, ASME B16.34

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Globe Valve (Control)

Class 150 / 300

Why: Cooling water and process control; coke quenching, BF cooling stave circuits

Materials: A216 WCB with SS316 trim; SS316L for demineralised water service

Standards: API 623, BS 1873, ASME B16.34

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Critical Requirements

BFG valves must accommodate sticky tar deposits — knife gate or through-conduit design; no wedge gate (tar packs the body cavity)
Large-bore butterfly valves for BFG (DN600–DN2400) — double-offset design for bubble-tight shutoff required at change of wind direction
IBR certification mandatory for all steam valves above 3.5 kg/cm² in Indian steel plants — Form III-C material and Form III-E hydrostatic test
Blast furnace water cooling valves — continuous service, no shutoff allowed; use dual parallel valves for maintenance
Coke oven gas (COG) — naphthalene deposition blocks small ports; use full-bore valves only; minimum DN50
IS 6157 compliance for BFG gate valves manufactured in India

Fluid & Service Challenges

⚠Blast Furnace Gas (BFG) — CO 22–25%, CO₂ 22%, N₂ 51%, H₂ 4%; toxic and flammable; very low calorific value (700–900 kcal/m³); tar and dust laden
⚠Coke Oven Gas (COG) — H₂ 55%, CH₄ 26%, CO 7%; high CV (4,500 kcal/m³); naphthalene deposition at <80°C blocks valve ports
⚠COREX/FINEX gas — similar to BFG with higher dust content; full-bore knife gate essential
⚠Hot metal and slag — no conventional valves; trough gates and slag pots (not standard inventory items)
⚠Cooling water — scale formation on soft water circuits; duplex SS for high-chloride cooling towers

Material Selection Guidance

BFG service: SS316 blade knife gate with WCB body — economical and replaceable. COG service: full SS316L to resist naphthalene-laden condensate attack; PTFE seats only (NBR attacked by COG condensate). Steam (cogeneration): WCB for 300°C steam, WC6 for 540°C, WC9 for 595°C — IBR Form III mandatory. Cooling water: WCB for DM water, rubber-lined butterfly for cooling tower water, Duplex 2205 for high-chloride or seawater-cooled systems.

Typical Service Points

Blast furnace gas main — DN600–DN2400 large-bore butterfly valves (PN 6–10, BFG isolation)
Blast furnace gas bleeder valves — knife gate for dust-laden BFG; rapid actuation on overpressure
Coke oven gas cross-over headers — full-bore SS316L ball or knife gate valves
Blast furnace stove valves — hot blast gate and check valves (900°C air service)
Basic Oxygen Furnace (BOF) waste gas — LD converter gas valves (similar BFG composition)
Cogeneration steam headers — IBR gate, globe, and check valves (40–100 bar, 480–540°C)

FAQ — Valve Selection for Coke Oven & Steel Plants

Why are knife gate valves preferred for blast furnace gas?
Conventional wedge gate valves trap BFG tar and dust in the body cavity, causing the gate to seize. Knife gate valves have no body cavity — the blade cuts through the medium with a shear action, shedding deposits on actuation. The flat-face gate also allows easy replacement in-situ when the knife edge wears, without removing the body from the pipeline. For large BFG mains (DN600–DN2400), double-offset butterfly valves are preferred over knife gates for better shutoff and lower actuator torque.
What IBR documentation is required for steel plant steam valves?
All steam valves above 3.5 kg/cm² must carry IBR Form III-C (Certified Material Test Report from the steel mill, showing heat number, chemical analysis, and mechanical test results) and IBR Form III-E (Hydraulic Test Certificate from the valve manufacturer, showing test pressure = 1.5 × rated working pressure held for ≥ 30 minutes). Vajra supplies both certificates as part of the standard documentation package for all IBR-certified valves.

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Coke Oven & Steel Plants

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Key Standards

IS 6157 (BFG Gate Valves)
ASME B16.34
IBR 1950 (Steam)
API 600
API 609
IS 2825
ASME B16.10

Products for This Application

Gate ValvesGlobe ValvesButterfly Valves

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