Double Studded Adapter (DSA), 13-5/8" 10K × 11" 10K, API 6A, Sour Service (NACE MR0175)

The Double Studded Adapter (DSA), 13-5/8" 10K × 11" 10K, API 6A, Sour Service (NACE MR0175) is a complete double studded adapter (dsa) unit rated for 10,000 psi working pressure (10K class) in sour service (nace mr0175). The 13-5/8" 10K × 11" 10K DSA adapts a 13-5/8" 10K BOP stack down to an 11" 10K wellhead — typical workover-on-development-wellhead arrangement. Two studded faces, no flange face — saves vertical height vs a spool. 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: Double Studded Adapter (DSA)
• Vertical bore size: 11"
• Cold working pressure: 10,000 psi (10K class)
• Service class: Sour Service (NACE MR0175)
• End connections: API 6A 13-5/8" 10K studded top × 11" 10K studded bottom; double studded adapter design
• 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
• Approximate weight: 950 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):

• Cameron DSA 13-5/8" 10K × 11" 10K
• FMC DSA
• Stream-Flo DSA

OEM cross-reference: Cameron DSA 13-5/8" 10K × 11" 10K, FMC DSA, Stream-Flo DSA — standard wellhead-to-BOP crossover.

Applications

• Workover stack adaptation to 11" 10K wellhead
• Mixed-class stack-ups on infill drilling
• Aramco / ADNOC / KOC workover campaigns
• Pre-completion stack adaptation

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 6A (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.