Subsea Annular BOP, Hydril GX Style, 18-3/4" 10,000 psi WP, Sour Service (NACE MR0175)

The Subsea Annular BOP, Hydril GX Style, 18-3/4" 10,000 psi WP, Sour Service (NACE MR0175) is a complete annular bop unit rated for 10,000 psi working pressure (10K class) in sour service (nace mr0175). The 18-3/4" 10K subsea annular is the LMRP-mounted annular on offshore stacks — heavy GX-style spherical packer with hydraulic-piston actuation suited to subsea remote operation. Tier 2 / offshore item — large per-unit value, RFQ-driven volume. NACE MR0175 / ISO 15156 sour-service compliant — full body, trim, and bolting hardness controlled per the standard. Required across Saudi Aramco, ADNOC, KOC, PDO, and QatarEnergy default specifications for sour fields.

Construction

• Equipment type: Annular BOP
• Vertical bore size: 18-3/4"
• Cold working pressure: 10,000 psi (10K class)
• Service class: Sour Service (NACE MR0175)
• End connections: API 6A 18-3/4" 10K flanged top × flanged bottom — for subsea LMRP / LRP integration
• Body material: Forged AISI 4130 alloy steel — NACE MR0175 hardness controlled (max 22 HRC); charpy V-notch tested at low temperature
• Temperature rating: -20°F to 180°F (-29°C to 82°C) — sour-service NACE MR0175 envelope
• Closing time: < 45 s on largest cavity (per API STD 53)
• Approximate weight: 14,500 kg (transport-ready)

OEM compatibility

Engineered as a recognised matched-pressure interchange / supply for the following OEM equipment lines (Indus Hydraulics is not an authorised distributor of these OEMs — units are sourced through Indus and supplied with full traceability):

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

OEM cross-reference: Hydril GX 18-3/4" 10K (genuine), Cameron 18-3/4" 10K subsea annular, Shaffer 18-3/4" 10K — for LMRP integration on subsea stacks.

Applications

• Subsea LMRP annular for jack-up and platform offshore drilling
• ADNOC offshore — Lower Zakum, Upper Zakum, Hail & Ghasha satellite jack-ups
• Saudi Aramco offshore — Marjan, Safaniyah expansion campaigns
• New-build offshore stack-ups for the GCC offshore drilling fleet

Performance & testing

Hydrostatic shell test at 1.5× rated working pressure on every unit. Function-test on rams, packers, and seal elements per API STD 53. Mill test reports per EN 10204 3.1 / 3.2 supplied. Charpy V-notch impact testing at low temperature available where service requires toughness verification. Closing-time and seal-pressure data sheets included with FAT package.

Compliance

• API 16A (per equipment class)
• NACE MR0175 / ISO 15156 (sour-service / H₂S)
• EN 10204 3.1 / 3.2 mill test reports
• Hydrostatic test certificates per unit
• Heat-number traceability stamped on body
• FAT (factory acceptance test) report on request

How to order

Confirm on your RFQ: (a) exact bore size, (b) working pressure and pressure class, (c) ram configuration / cavity count (where applicable), (d) end connection family (API 6A studded, flanged, or bolted), (e) service class — sour (NACE MR0175), HPHT, or standard, (f) elastomer compound preference (HNBR / AFLAS for GCC sour service), (g) FAT witness requirement, and (h) destination port for door-to-door logistics. Indus quotes ex-Dubai (AED) with Aramco / ADNOC / KOC vendor-registered logistics support.

Region notes

Stocked / sourced for the GCC: Saudi Arabia (Aramco IKTVA), UAE (ADNOC ICV), Kuwait (KOC), Oman (PDO), Qatar (QatarEnergy), Bahrain (BAPCO), and Iraq south. Sour-service trim is the regional default; Indus carries sour-service variants in stock and treats sweet-service as a build-to-order downgrade.

Companion products

Pair with matched-pressure 10K BOP control unit (Koomey-style accumulator), API 16C choke & kill manifold, BX ring gaskets, B7M studs and 2H nuts (sour service), HNBR / AFLAS elastomer kits, and matching drilling spool / DSA crossover. Annual redress kits and 5-year API 16A recertification service available — see the BOP Services category.