Subsea Annular Packing Element, Hydril GX Style 18-3/4" 10K, HNBR Sour Service (NACE MR0175)

The Subsea Annular Packing Element, Hydril GX Style 18-3/4" 10K, HNBR Sour Service (NACE MR0175) is a recurring-purchase annular packing element sized for 18-3/4" bore BOP equipment. The 18-3/4" 10K Hydril GX annular packing element is the subsea LMRP annular consumable — heavy-section element for subsea pressure containment. Tier 2 / offshore item; lower replacement frequency than land but high per-unit value. NACE MR0175 / ISO 15156 sour-service compliant — required across Saudi Aramco, ADNOC, KOC, PDO, QatarEnergy default specifications for the GCC.

Construction

• Spare-part type: Annular Packing Element
• Fits OEM: Hydril GX 18-3/4" 10K subsea
• BOP bore size: 18-3/4"
• Cold working pressure: 10,000 psi (10K class)
• Service class: Sour Service (NACE MR0175)
• Elastomer compound: HNBR (sour-service grade)
• Material: HNBR (hydrogenated nitrile) compound — qualified per NACE TM0297 for H₂S resistance, NACE TM0187 for amine resistance, batch hardness controlled
• Temperature rating: -20°F to 250°F (-29°C to 121°C) — sour-service NACE MR0175 envelope

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):

• Hydril GX 18-3/4" 10K element
• Cameron LMRP 18-3/4" 10K element
• Shaffer subsea annular 18-3/4" 10K element

Applications

• Subsea LMRP annular element replacement on offshore stacks
• ADNOC offshore — Lower Zakum, Upper Zakum, Hail & Ghasha satellite jack-ups
• Saudi Aramco offshore — Marjan, Safaniyah expansion
• 5-year subsea stack overhaul element replacement

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.