Cryogenic Top Entry Trunnion-mounted Ball Valves

Beschrijving

TECHNICAL DATA SHEET: TOP ENTRY TRUNNION-MOUNTED (FIXED BALL) CRYOGENIC BALL VALVE

1. Valve Identification:

• Type: Top Entry, Full Port (FP) / Reduced Port (RP), Trunnion-Mounted (Fixed Ball) Design
• Werking: Gear Operated / Extended Stem with Actuator (Pneumatic, Electric, Hydraulic)
• Ontwerpstandaard: BS 6364 / ISO 28921-1 / MSS SP-134 / API 6D (Annex F – Cryogenic)
• Persoonlijk: ASME B16.10 / ISO 5752 Series 11 (Cryogenic Extended) / BS 6364 Table 1
• Verbinding beëindigen: Flanged (RF, RTJ) ASME B16.5 / ASME B16.47 / EN 1092-1 / ISO 7005 / BW (ASME B16.25)
• Body Construction: Top Entry (Single Piece Body with Removable Bonnet/Cover)

2. Design Parameters & Service:

• Size Range: DN 50 (2″) to DN 600 (24″) [Typical for fixed ball, specify range]
• Drukklasse: ASME: 150, 300, 600, 900, 1500 | PN: 10, 16, 25, 40, 63, 100 [Specify]
• Temperatuurbereik:
• Standard Design: -196°C (-320°F) [Liquid Nitrogen]
• Extended Design: Down to -254°C (-425°F) [Liquid Hydrogen]
• Upper Limit: +80°C (+176°F) (Dependent on seals)
• Design Pressure: Per ASME B16.34 at minimum design temperature (incl. low-temp derating).
• Service: LNG, LIN, LAR, LOX, LHe, LCO₂, Ethylene, High-Pressure Cryogenic Gases.

3. Body & Bonnet (Cover):

• Material: A351 CF8M (316) / CF3M (316L) – Standaard. A350 LF2 (clad) / Nickel Alloys (LOX/Corrosive).
• Cryogenic Treatment: All pressure parts thermally stabilized per BS 6364.
• Extended Bonnet: Mandatory. Length per BS 6364 Table 1 or custom. Includes drip plate.

4. Ball & Trunnions:

• Ball Material: AISI 316/316L (Std), 17-4PH (H1150M) (HP), Inconel 718/625 (Corr/LOX).
• Trunnion Material: Matches ball or higher strength (17-4PH, Inconel). Mechanically secured to body.
• Oppervlakteafwerking: Ra ≤ 0.4 µm (16 µin) on sealing surfaces.
• Design: Fixed to trunnions. Zero shaft load, minimal friction, high-pressure stability.

5. Seats & Sealing System:

• Type: Spring + Line Pressure Energized (Piston Effect), Dual-Sealing.
• Seat Material:
• Primary: Reinforced PTFE (RPTFE) / PCTFE (Kel-F) (Std, Cryo-Tight).
• Fire-Safe Option: Graphite/Metal seats with RPTFE primary seal (*API 607/6FA*).
• Design:
• Bidirectional Sealing. Line pressure forces seats against ball.
• Cavity Relief: Automatic pressure relief through seats upon opening.
• Spring Preload: Maintains seal at zero/low pressure.

6. Stang:

• Material: A182 F316/F316L (Std), 17-4PH (H1150M) (HP), Monel K500/Inconel 718 (LOX/Corr).
• Design: Floating Stem (decoupled from seat load), Blowout-Proof, Anti-Static per BS 6364.
• Stem Seals:
• Primary Seal (Cryo Zone): Low-temp PTFE chevrons/graphite foil.
• Secondary Seal (Ambient): Live-loaded graphite packing. Fire-safe design.

7. Bearings & Thrust Control:

• Trunnion Bearings: Self-lubricating, cryogenic-compatible (Rulon® AR, Turcon®).
• Thrust Washers: PTFE composites on ball/seat interface.
• Function: Absorb line thrust, minimize operating torque, prevent galling.

8. Sealing & Leakage:

• Seat Leakage: Class VI (Bubble-Tight) per ISO 5208/API 598 (Tested cryogenically).
• Stem Leakage: ISO 15848-1 Class B or better (Ambient & Cryo).
• Fire Safe: API 607/6FA / ISO 10497 (Optional).
• Anti-Static: BS 6364 / ISO 28921-1 compliant.

9. Werking:

• Operating Torque: Consistently low (even at high ΔP). [Specify max torque at cryo temp].
• Rotation: 90° quarter-turn. Open: CCW (Standaard).
• Aansturing: Gearbox recommended. Pneumatic/Electric with extended kit.

10. Cryogenic Testing (Per BS 6364 / ISO 28921-1):

• Cryogenic Seat Test: Submerged in LN₂ at design pressure.
• Thermal Cycling: 5-15 cycles (ambient ↔ cryo) + leakage test.
• Operation Test: Functionality at cryo temp.
• Anti-Static Test: Continuity verified.
• High-Pressure Gas Test: Optional (e.g., per ISO 17292).

11. Features & Advantages (vs. Floating Ball):

• High-Pressure Capability: Stable sealing up to ASME 1500 class.
• Reduced Operating Torque: Trunnions absorb thrust → smaller actuators.
• Zero Shaft Load: Stem only transmits rotation → longer stem/seal life.
• Bidirectional Sealing & Cavity Relief: Inherent design safety.
• Stable Seating: Minimal seat deformation under thermal stress.
• Wider Size Range: Suitable for larger diameters (DN 300+).

12. Applications:

• LNG Liquefaction & Storage Tanks
• High-Pressure Cryogenic Gas Transmission (e.g., Pipeline Compressor Stations)
• Large-Diameter Transfer Lines (>DN 300)
• Air Separation Units (ASUs) – LOX/LIN/LAR Service
• Liquid Hydrogen Infrastructure
• Ethylene Crackers & Storage

13. Optional Features:

• Double Block & Bleed (DBB) via body vents
• Fire-Safe Design (API 607/6FA)
• Oxygen Service Cleaning (CGA G-4.1/EIGA DOC 33/18)
• Custom Stem Extensions for thick insulation
• Partial Stroke Test (PST) capability
• Positioners/Limit Switches

14. Certifications & Compliance:

• Design: BS 6364, ISO 28921-1, API 6D Annex F, PED 2014/68/EU
• Materialen: EN 10204 3.1/3.2, NACE MR0175 (if sour)
• Testing: Certified Cryogenic Test Reports
• Quality: ISO 9001:2015

Key Distinctions from Floating Ball Design:

1. Mechanical Support: Ball is rigidly held by trunnions (not floating on stem).
2. Seat Load: Line pressure energizes seats → sealing improves with pressure.
3. Torque: Significantly lower and stable across pressure ranges.
4. Drukclassificatie: Suitable for ASME 1500+ classes.
5. Cavity Management: Automatic pressure relief without external ports.
6. Stem Function: Pure rotational force only (no axial thrust).

Let me know if you need deeper technical focus on trunnion mechanics, fire-safe options for fixed ball, or specific cryogenic test protocols.

GARANTIE:

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