Annular Element + Head Seal Kit, Hydril GK Style 13-5/8" 5K, HNBR Sour Service (NACE MR0175)

The Annular Element + Head Seal Kit, Hydril GK Style 13-5/8" 5K, HNBR Sour Service (NACE MR0175) is a recurring-purchase annular element + head seal kit sized for 13-5/8" bore BOP equipment. The Annular Element + Head Seal Kit is the converted-bundle version of "the annular soft-goods I always order together at redress" — complete annular rebuild packaging. HNBR sour-service grade by default for the 13-5/8" 5K Hydril GK annular. 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 Element + Head Seal Kit
• Fits OEM: Hydril GK 13-5/8" 5K
• BOP bore size: 13-5/8"
• Cold working pressure: 5,000 psi (5K class)
• Service class: Sour Service (NACE MR0175)
• Elastomer compound: HNBR (sour-service grade)
• Material: HNBR annular packing element + HNBR head seal + HNBR piston seal + bronze wear plate; sour-service grade throughout
• Temperature rating: -20°F to 250°F (-29°C to 121°C) — sour-service NACE MR0175 envelope

Kit contents

Annular packing element (1) + head seal (1) + piston seal (1) + wear plate (1) + assembly grease (1 tube) + step-by-step instructions — complete annular rebuild for a Hydril GK 13-5/8" 5K

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 GK 13-5/8" 5K rebuild kit
• Hydril GK annular element + head seal

Applications

• 12-month annual redress on 13-5/8" 5K Hydril GK annulars
• Field rebuild after pressure-test failure
• Pre-shipment rebuild before mobilising the rig
• 5-year API 16A annular overhaul

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.