Description

Technical Data Sheet

ESD Pneumatic Single-Acting Trunnion Mounted Ball Valve

Model: ESV-TB-SR-Class1500 / Offshore Platform Duty

1. Product Overview

This product is a single-acting pneumatic trunnion-mounted ball valve designed for Emergency Shutdown (ESD) applications. It features a reduced bore design to optimize flow characteristics under high pressure and is equipped with a spring-return single-acting actuator to achieve Fail-Close functionality upon loss of air supply or control signal. The valve design fully considers the harsh conditions of offshore platforms, offering excellent seawater corrosion resistance and fire-safe, explosion-proof capabilities.

2. Valve Key Specifications

Parameter	Specification
Valve Type	Trunnion-Mounted Ball Valve
Nominal Size	6 inch (DN150) Body / 4 inch (DN100) Reduced Bore
Pressure Rating	ASME Class 1500 (PN250)
Connection Type	Flanged Ends (RF Raised Face or RTJ Ring Type Joint)
Design Standard	API 6D, ASME B16.34
Face-to-Face Dimension	ASME B16.10
Fire Safe Design	API 607 / ISO 10497 (Metal-to-metal secondary seal if soft seats are destroyed by fire)
Anti-Static Device	Compliant with API 608 / API 6D (Spring-loaded plunger between ball, stem, and body)
Safety Integrity Level	Designed to meet SIL 2 or SIL 3 requirements (with appropriate actuator)
Fugitive Emissions	ISO 15848-1 (Optional)
Environmental Suitability	Suitable for marine climates with high salinity corrosion
Enclosure Protection	IP67 / IP68 (Actuator and accessories)
Explosion Proof Rating	Ex d IIC T4 (or Ex ia, compliant with ATEX/IECEx)
Temperature Range	-29°C to +120°C (Depending on seat material)

3. Corrosion-Resistant Material Schedule (Offshore Grade)

Component	Recommended Material (Seawater Resistant)	Remarks
Body	ASTM A352 LCC (Low Temp Carbon Steel) / AISI 316L SS	Carbon steel requires heavy-duty coating
Bonnet	ASTM A352 LCC / AISI 316L SS	Matching body material
Ball	ASTM A182 F316 SS	Polished finish; optional hard chrome or Nickel Alloy coating
Stem	ASTM A564 630 (17-4 PH) / A182 F316 SS	High strength, corrosion-resistant
Primary Seat (Soft)	Reinforced PTFE (RPTFE) or PEEK	Zero-leakage sealing for normal operation
Seat Support Ring	AISI 316L SS + Stellite Hardfacing	Fire-safe layer & erosion resistance
Body Bolting / Nuts	A193 Gr. B8M (Class 2) / A194 Gr. 8M	316 SS, resistant to salt spray
Stem Packing	Flexible Graphite	Fire-safe, low emission, self-lubricating
Gaskets	Spiral Wound Gasket (SS316+Graphite)	Fire-safe design
Surface Coating	Epoxy Zinc-Rich Primer + Marine Grade Polyurethane Topcoat (if carbon steel body)	DFT ≥ 300μm

4. Actuator & Control System (ESD Function)

Item	Specification
Actuator Type	Single-Acting Pneumatic Actuator (Scotch Yoke or Rack & Pinion)
Action Mode	Fail to Close (FC) – Spring Return
Supply Air Pressure	5 bar – 8 bar (Calculated based on torque requirement)
Control Accessory	ASCO / NAMUR Solenoid Valve (Low power 24V DC, continuous duty type)
Accessory Package	Limit Switch Box (Mechanical or Proximity sensors for remote position feedback)
Quick Exhaust Valve	To accelerate closing response time
Air Preparation	Filter Regulator (with SS pressure gauge)
Position Indicator	Top-mounted visual position indicator
Tubing & Fittings	All 316 Stainless Steel materials, double ferrule type

5. Performance Data

Item	Performance Criteria
Leakage Rate	ANSI/FCI 70-2 Class VI (Soft seated) / Class IV (Metal auxiliary seal)
Closing Time	≤ 2 sec – 3 sec (Dependent on actuator sizing and volume)
Cycle Life	≥ 100,000 cycles (Test conditions)
Torque Safety Factor	Actuator output torque ≥ 1.5 – 2 times the max valve break torque
Sour Service	Compliant with NACE MR0175 / ISO 15156 requirements

6. Principal Dimensions (Reference)

Note: Final dimensions to be confirmed based on manufacturer’s detailed drawing.

Dimension Item	Value (mm)
Valve Size (Connection)	DN 150 (6″)
Reduced Bore Diameter	Approx. 100 mm (4″)
Face-to-Face Length	ASME B16.10 – Approx. 600 mm (To be verified)
Flange Outer Diameter (OD)	Approx. 385 mm (ASME B16.5 Class 1500)
Flange Bolt Circle Diameter	Approx. 317.5 mm
Flange Bolt Holes Qty – Dia.	12 – Φ32 mm (Reference)
Actuator Height (approx.)	To be calculated based on torque
Approx. Weight	To be calculated based on materials

7. Design Features & Advantages

Fire-Safe Design: In the event of a fire destroying the soft seats, the metal-to-metal contact between the ball and the seat support ring provides secondary sealing, minimizing internal leakage.
Trunnion Mounted Ball: The ball is fixed by upper and lower stems with bearings, reducing operating torque and ensuring stable performance under high pressure.
Double Block & Bleed (DBB) Capability: When fully closed, the cavity between the seats can be vented, allowing for online maintenance.
Automatic Cavity Relief: The seat design allows automatic pressure relief from the body cavity to the pipeline, protecting the valve body from overpressure.
Anti-Blowout Stem: The stem is retained by an internal shoulder in the body, ensuring it cannot be forced out by line pressure even if the packing gland is removed.

8. Applications

Offshore Platforms: Production manifolds, pipeline end manifolds, separator inlet/outlet isolation.
FPSO (Floating Production Storage & Offloading): High-pressure oil and gas processing systems.
Onshore Terminals: Sour gas treatment, emergency isolation of hazardous chemicals.

9. Ordering Guide

Please specify the following information to ensure correct configuration:

Valve Size & Pressure: 6″ x 4″ – 1500LB
Materials: Body / Stem / Ball / Seat (As per corrosion-resistant schedule)
Actuator: Single-Acting Pneumatic (Spring Return) / Fail to Close
Accessories: Solenoid Valve (Voltage/Ex-rating), Limit Switch Box, Positioner, etc.
Certifications: API 607, NACE MR0175, SIL Rating, DNV/ABS Type Approval (if required)

ESD (Emergency Shutdown) Trunnion Mounted Ball Valve (6″*4″-1500LB)