Fire Safe Forged Steel Trunnion Ball Valve

The Fire Safe Forged Steel Trunnion Mounted Ball Valve is engineered for critical isolation service in Oil & Gas, LNG, refinery, petrochemical, and offshore applications, where zero leakage, fire safety compliance, fugitive emission control, and long-cycle reliability are mandatory.

Field-Proven Engineering Experience

This trunnion ball valve design is developed based on field requirements from:

High-pressure transmission pipelines (Class 150–2500 applications)
LNG liquefaction and regasification facilities
Refinery process isolation systems (sour & sweet service)
Offshore platform and subsea topside modules

Engineering optimization outcomes observed in field applications:

Up to 40% reduced operating torque vs equivalent floating ball valves
Improved actuator sizing efficiency for large-diameter valves (DN150 and above)
Enhanced seat stability under high differential pressure cycling
Improved sealing reliability under thermal shock conditions

Design Standards & Global Compliance

This valve is designed and manufactured in full compliance with international standards:

Design & Construction	API 6D / ASME B16.34
Fire Safe Testing	API 607 / ISO 10497
Pressure Testing	API 598 / API 6D
Fugitive Emissions	ISO 15848-1 Class AH / BH (optional)
Sour Service Compliance	NACE MR0175 / ISO 15156
Flange Interface	ASME B16.5 / B16.47
Actuator Mounting	ISO 5211
Quality System	ISO 9001 / API Q1 compliant manufacturing system

Fire-Safe Engineering Design

The valve is engineered with a dual-seal fire-safe architecture:

Primary Seal (Normal Operation)

Soft seated sealing system (PTFE / R-PTFE / PEEK / Devlon)
Bubble-tight shutoff performance (ISO 5208 Rate A)

RSecondary Fire-Safe Seal

In fire conditions, soft seat materials degrade
Spring-loaded mechanism forces metal seat contact with ball
Metal-to-metal sealing ensures continued isolation integrity

Stem Fire Protection System

Flexible graphite packing system
Anti-blowout stem design (internally retained)
Anti-static grounding between ball, stem, and body

Materials of Construction

All pressure-containing parts are supplied with EN 10204 3.1 material certification and full heat-number traceability.

Component	Standard Material	Optional / Severe Service Upgrade
Body / Adapter	ASTM A105 / A182 F316 / F304	Super Duplex / Inconel 625 Cladding
Ball	F316 / ENP Carbon Steel	Tungsten Carbide Coated / Stellite Hardfaced
Stem	F316 / 17-4PH	Inconel 718
Seat Ring	F316 / Carbon Steel	Metal Seated (TCC / Stellite)
Seat Insert	PTFE / R-PTFE / PEEK	Metal-to-metal high temperature
Bolting	ASTM A193 B7 / A194 2H	B8M / 8M (NACE compliant)

Pressure, Temperature & Performance Range

01/

Pressure Classes
ASME Class: 150 / 300 / 600 / 900 / 1500 / 2500

02/

Size Range
DN50 – DN1200 (2" – 48")

03/

Operating Temperature
Soft Seated: -29°C to +200°C
Metal Seated: -46°C to +450°C

04/

Performance Characteristics
Leakage Rate: ISO 5208 Rate A (soft seat), Rate D (metal seat)
Design Life: 10,000 – 50,000 full operating cycles
Anti-static & fire-safe stem grounding included as standard

Manufacturing Quality & Inspection Control

Each valve is delivered with a complete EPC-ready quality dossier, including:

EN 10204 3.1 Material Test Certificates (MTCs)
Hydrostatic & pneumatic pressure test reports (API 6D)
NDE reports (RT / UT / MT / PT as applicable)
Dimensional inspection reports (ASME B16.10 compliance)
Functional torque test curves (for actuated valves)
Final inspection release certificate (TPI endorsed where required)
GA drawings & 3D CAD files (STEP / IGES formats)

Operational Advantages for EPC & End Users

Cost Optimization

Reduced actuator size requirement due to trunnion support system
Lower lifecycle maintenance cost vs floating ball valve systems

Safety Performance

Certified fire-safe sealing integrity (API 607 / ISO 10497)
Designed for sour service (H₂S environments per NACE MR0175)

Reliability

Stable sealing under high differential pressure
Reduced seat deformation under cycling conditions
Anti-blowout stem design for critical safety isolation

Typical Applications

LNG liquefaction & regasification terminals
Oil refinery process isolation systems
Gas transmission & distribution pipelines
Offshore platform topside piping systems
Petrochemical high-pressure reactor isolation lines

Frequently Asked Technical Questions

Q: Why is trunnion design preferred in high-pressure EPC projects?

A: Trunnion-mounted construction mechanically supports the ball at both ends, reducing friction and eliminating ball displacement under pressure. This significantly lowers torque requirements and improves actuator sizing efficiency in large-diameter pipelines.

Q: How does the fire-safe sealing system work?

A: During fire exposure, soft seat materials degrade, but spring-loaded seat rings move into direct metal-to-metal contact with the ball surface. This ensures continued isolation even under extreme thermal conditions.

Q: Can this valve be used in sour service environments?

A: Yes. Materials comply with NACE MR0175 / ISO 15156, ensuring resistance to sulfide stress cracking in H₂S-containing environments.

Q: What is the typical EPC delivery lead time?

A: Standard carbon steel valves (DN50–DN300): 4–8 weeks
Large diameter / special alloys / coated systems: 8–12+ weeks depending on forging mill availability

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