Compact Shear-Seal BOP Valve (CSS)

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Deployed by 6 companies

Well Integrity. Done Well.

Page last modified

November 3 2025

Our Compact Shear & Seal (CSS) BOP valve is a modular and stackable assembly designed for surface and open water subsea well intervention operations where reduced size and weight is advantageous. It can simplify wellsite handling and logistics and improves efficiency and safety by avoiding heavy lifting and access restrictions.

Modular configuration: Available as single, dual, triple or quad stack-up.

Functionality: Delivers pipe ram, shear ram, and seal ram operations—independently or simultaneously.

Dimensions:

Single: 850 × 540 × 500 mm
Dual: 850 × 1080 × 500 mm (33.5” × 19.75” × 42.5”)

Weight: <1 tonne (50% lighter than conventional BOPs).

Bore sizes: 5-1/8” or 6-3/8".

Pressure rating: 5,000 psi.

Shear rating: 100,000 lbs.

Compatible media: Slickline, braided line, e-line cable, hollow rod, coiled tubing up to 2-7/8” (80–130 ksi), and e-coil.

Design features:

Internal actuator and piston housing for reduced envelope size
Field-replaceable inserts for seal changes and bore reconfiguration

Crane-free maintenance and redress at the wellsite

Integration: Compatible with Unity’s Rigless Subsea Access System (RSAS) and Surface Intervention System (SIS)

Deployment: Suitable for onshore and offshore operations; available for sale or rental

Support: Crossovers available to match client rig-up configurations; training provided for redress and maintenance

Pros & Limitations

Lightweight – 50% lighter than conventional design

Compact– 33.5″ at its widest point.

Versatile – Onshore or offshore surface applications, or subsea open water applications.

Universal – Shears and seals SIS rods, coiled tubing, wireline, slickline, e-line.

Customisable – Replaceable rams for varying applications.

Easy to Maintain – Designed to easily access rams and seals for redress.

High-pressure applications beyond 5,000 psi

Specification

Title	Description
Theme/Discipline	Well Operations
Core Tech	Hardware Tool
Industry	Oil
Areas of Application	Designed for surface and open water subsea intervention \| Suitable for slickline, braided line, e-line, hollow rod, coiled tubing (up to 2-7/8”, 80–130 ksi), and e-coil \| Enables live well access, plug setting, and shallow well control.
Performance & Ratings	Delivers pipe ram and shear ram functionality in dual, triple or quad stack-up \| Pressure rated to 5,000 psi \| Shear rating of 100,000 lbs \| Available in 5-1/8” and 6-3/8” bore sizes.
Footprint & Handling	50% lighter than conventional BOPs, single unit weighs <1 tonne \| Compact dimensions: 850 × 540 × 500 mm (dual: 850 × 1080 × 500 mm) \| Internal actuator design eliminates bulky pistons and reduces handling risks.
Maintenance & Modularity	Modular seal ram block enables independent or simultaneous shear and seal operations \| Field-replaceable inserts allow fast seal changes and bore reconfiguration \| Crane-free redress and servicing at the wellsite.
Deployment & Support	Compatible with Unity’s RSAS and SIS systems for rigless intervention \| Available for sale or rental, onshore or offshore \| Crossovers provided to match client rig-up \| Training available for redress and maintenance.