Shaffer annular bop price manufacturers

When sourcing a Shaffer-type Annular BOP, the price is primarily driven by the Working Pressure (WP) and Bore Size. Common specifications include 3,000 PSI, 5,000 PSI, and 10,000 PSI. You must verify the internal diameter (e.g., 7-1/16", 11", 13-5/8") to ensure it matches your drilling string. Additionally, ensure the unit features a forged steel body rather than cast steel for high-pressure integrity, and check if the packing element is made of high-quality nitrile (NBR) or neoprene for oil and gas resistance.

To ensure safety and legal operation, the product must strictly adhere to API Spec 16A (Specification for Drill-through Equipment). Buyers should demand API 16A Monogrammed equipment. Furthermore, for sour gas environments, compliance with NACE MR0175/ISO 15156 is essential to prevent hydrogen-induced cracking. Always request the Material Test Reports (MTRs) and Hydrostatic Pressure Test Certificates before finalizing the purchase.

The Shaffer-style design is favored for its conical or spherical packing element, which allows for the closure on almost any shape (drill pipe, kelly, or tubing) and provides a longer feedable life. While the initial price might be higher than generic alternatives, the ease of element replacement (often requiring only the removal of the head bolts) significantly reduces rig downtime, offering a lower Total Cost of Ownership (TCO).

Price differences usually stem from the certification level and the origin of the elastomer components. A 'Premium' price often includes third-party inspection (TPI) by agencies like ABS or DNV. Suppliers offering significantly lower prices may be using non-certified steel or lower-grade seals. Always clarify if the price includes the hydraulic control unit (ACC) or just the BOP stack itself.

The biggest risks are non-compliance with local petroleum board regulations and damage during maritime transit. Ensure the supplier uses seaworthy export packaging, specifically vacuum-sealed plastic wrapping and reinforced steel-framed wooden crates to prevent corrosion from sea air. Verify that the supplier is a Gold Member or Audited Supplier on Made-in-China.com to mitigate transaction risks.

Due to the extreme weight of BOPs, Sea Freight (FCL - Full Container Load) is the standard. Negotiate for FOB (Free on Board) or CIF (Cost, Insurance, and Freight) terms. It is highly recommended to use Letter of Credit (L/C) for payments exceeding $50,000 to ensure the supplier meets all technical and shipping documentation requirements before funds are released.

Never release the final payment without a Factory Acceptance Test (FAT). If you cannot visit the factory in China, hire a professional third-party inspection service (like SGS or Intertek) to witness the shell pressure test (usually 1.5x working pressure) and the closure test. Ensure the Serial Number on the test report matches the physical unit being shipped.