Shaffer DD567-32-CGV Pressure Gauge 25567-32B21CGV-LCV1

Shaffer DD567-32-CGV Pressure Gauge (MPN: 25567-32B21CGV-LCV1)

The Shaffer DD567-32-CGV (Part Number: 25567-32B21CGV-LCV1) is a heavy-duty, marine- and offshore-grade analog pressure gauge engineered specifically for severe pulsating, high-vibration, and corrosive marine rig environments. Manufactured under the Shaffer / 3D Instruments precision legacy, this gauge utilizes a direct-drive Inconel/helical Bourdon sensing element that eliminates delicate mechanical gear movements (pinions and hairsprings). This gearless architecture drastically minimizes calibration drift, mechanical wear, and needle flutter under harsh pressure transients commonly encountered in blowout preventer (BOP) accumulator control units, marine hydraulic power units (HPUs), and tensioner load-monitoring skids.

Model Details

• Manufacturer: National Oilwell Varco (NOV) / Shaffer
• Base Model Series: DD567 / 25567 Series Direct Drive
• Dial / Configuration Code: DD567-32-CGV
• Manufacturer Part Number (MPN): 25567-32B21CGV-LCV1
• Internal / Engineering Part Number: 205925 / 0216012 Series Variant
• Dial Specification: Dual-scale / calibrated process readout with high-visibility zero-drag pointer
• Process Interface: 1/4″ NPT Male (or 1/2″ NPT with rig adapter manifold) bottom/lower back panel mount

Technical Specifications

Equipment Compatibility

• Shaffer / Cameron / Hydril BOP Control Systems: Koomey-type hydraulic accumulator units, manifold pressure monitoring racks, and annular control panels.
• Deck Winches & Marine Cranes: Hydraulic winch tension indicators, dead-weight anchor line load cells, and heave compensation packs.
• Well Intervention & Choke/Kill Manifolds: Mud line choke drill consoles, test separators, and cement manifold standpipes.
• Rig Machinery Skids: Hydraulic power units (HPUs), high-pressure mud pump delivery loops, and rig hydraulic test benches.

Part Number Cross-References

• 25567-32B21CGV-LCV1 (Full Model Callout)
• DD567-32-CGV (Dial face / Configuration designation)
• 25567-32B21HUR (Alternative hydraulic response variant)
• NL Shaffer 0216012 (Legacy drilling catalog reference)
• Shaffer OEM P/N 205925 (Drilling rig load and pressure panel spare part number)

Key Features

• Gearless Direct-Drive Movement: Directly couples the helical Bourdon coil to the needle, eliminating gears, sector links, and hairsprings that typically shear or jump during extreme line surges.
• Exceptional Vibration Damping: Inherently dampens rig cyclic resonance and line pulsation without requiring internal glycerin fill that can dislodge or discolor under UV exposure.
• Corrosion-Resistant Metallurgy: Uses Inconel / 316 SS sensing assemblies built to withstand humid, salt-spray, and marine H2S sour gas flare environments.
• Sustained Zero Stability: Withstands up to 150% full scale overpressures without permanent zero shift, eliminating frequent calibration work offshore.
• High-Contrast Dial Readout: Anti-glare dial printing with luminescent / bold graduations for rapid monitoring from distance across the rig floor or machinery space.

Industrial Applications

• Offshore drill ship and jackup rig Blowout Preventer (BOP) accumulator hydraulic circuits.
• Marine deck equipment, deepwater mooring winches, and anchor windlasses.
• Mud logging skids, cement pumping systems, and high-pressure manifold monitoring.
• High-pressure gas test benches and nitrogen charging units.
• Marine boiler feed lines, fuel oil booster units, and hydraulic steering gear systems.

Frequently Asked Questions

What differentiates the Shaffer DD567-32-CGV direct-drive gauge from a standard Bourdon gauge?

Standard gauges rely on a curved C-tube linked to a toothed gear segment and pinion that multiplies tiny deflections. In rough marine operations, gears jump teeth, vibrate, and wear out quickly. The DD567 direct-drive design uses an extended helical coil connected straight to the pointer spindle, eliminating wear-prone gears entirely and drastically reducing failures.

Can this gauge be installed in hazardous outdoor offshore environments?

Yes. The weather-tight case is sealed against heavy seas, salt spray, and atmospheric contaminants, matching IP65/IP66 specifications. Being entirely mechanical, it introduces no ignition source and is suitable for hazardous offshore zones (ATEX Zone 1 / Class I, Division 1).

Does this gauge require liquid filling (glycerin or silicone)?

No. The inherent low-mass helical Bourdon element inside the Shaffer / 3D Instruments mechanism self-dampens high vibrations. It operates dry, avoiding yellowing dial faces, leaking fill plugs, or temperature-induced internal case pressurization issues.

How often should the gauge be recalibrated?

In standard offshore drilling and marine plant services, an annual (12-month) recalibration is standard protocol to comply with classification societies (such as ABS or DNV). If the gauge is installed on safety-critical BOP control circuits, verification should align with scheduled BOP survey windows (typically every 6 months).