Variable Bore Ram (VBR) Block Assembly, Cameron U Style 11" 10K, 3-1/2"–5" Range, Sour Service (NACE MR0175)

The Variable Bore Ram (VBR) Block Assembly, Cameron U Style 11" 10K, 3-1/2"–5" Range, Sour Service (NACE MR0175) is a recurring-purchase variable bore ram (vbr) block sized for 11" bore BOP equipment. The Cameron-U-style VBR (variable bore ram) seals on a range of pipe ODs (3-1/2" to 5") — used on multi-tubular drilling programmes where the same cavity must seal different string ODs. Higher wear rate than fixed-OD pipe rams; annual redress is the norm. HNBR sour-service standard. NACE MR0175 / ISO 15156 sour-service compliant — required across Saudi Aramco, ADNOC, KOC, PDO, QatarEnergy default specifications for the GCC.

Construction

• Spare-part type: Variable Bore Ram (VBR) Block
• Fits OEM: Cameron U / UII 11" 10K (VBR-II compatible)
• BOP bore size: 11"
• Cold working pressure: 10,000 psi (10K class)
• Service class: Sour Service (NACE MR0175)
• Elastomer compound: HNBR (sour-service grade)
• Pipe / tubing size: 3-1/2" to 5" pipe / tubing OD range
• Material: Forged AISI 4130 alloy steel block (NACE MR0175 hardness controlled); HNBR top seal, multi-segment front packer with steel inserts, side packers
• Temperature rating: -20°F to 250°F (-29°C to 121°C) — sour-service NACE MR0175 envelope

Kit contents

VBR block (1) + top seal (1) + multi-segment front packer (1 set) + side packers (2) + ram screws (4) + assembly grease (1 tube) — single cavity

OEM compatibility

Engineered as a recognised aftermarket-acceptable replacement for the following OEM equipment lines (Indus Hydraulics is not an authorised distributor of these OEMs — parts are manufactured to the OEM dimensional standard with full mill test reports and API monogram traceability):

• Cameron VBR-II 11" 10K 3-1/2"–5"
• Shaffer SL VBR 11" 10K
• Hydril V VBR 11" 10K

Applications

• Multi-tubular drilling and workover programmes
• Aramco / KOC infill drilling with multiple casing strings
• Workover stacks running multiple tubing sizes
• 12-month annual redress on VBR-equipped cavities

Performance & testing

Each unit is dimensionally inspected against the OEM datum, dye-penetrant or magnetic-particle inspected for surface defects, and shipped with mill test reports per EN 10204 3.1 / 3.2. Elastomer parts are batch-tested for hardness, compression set, and fluid resistance (sour service variants tested per NACE TM0297 / TM0187 where applicable). Charpy V-notch impact testing on metallic parts available where service requires low-temperature toughness verification.

Compliance

• API 16A (per part class)
• NACE MR0175 / ISO 15156 (sour-service / H₂S)
• EN 10204 3.1 / 3.2 mill test reports
• Dimensional inspection report per part
• Heat-number / batch traceability

Sealed & dated packaging (GCC climate)

50 °C ambient + UV degrades unsealed elastomers in storage. Indus ships every elastomer / packing element / soft-goods kit in heat-sealed UV-resistant bags with manufacture date, batch number, and recommended-use-by date stamped on the outer label. Re-sealable bins for partial use. This is what Aramco / ADNOC / KOC supplier audits ask about — make sure you specify "sealed dated packaging" on the RFQ.

How to order

Confirm on your RFQ: (a) exact OEM part number or BOP serial number being serviced (we cross-reference to the matched aftermarket part), (b) bore size and working pressure, (c) drill-pipe or casing OD if a ram packer or VBR, (d) elastomer compound preference (HNBR / AFLAS for sour service GCC default), (e) bolting grade (B7M / L7M for sour), (f) certification requirements (NACE, charpy, mill 3.2 vs 3.1, IKTVA / ICV documentation), (g) destination port and packaging requirements. Indus quotes ex-Dubai (AED) — sales@indushydraulics.me or WhatsApp +971.