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Subsea Wellhead Ball–Valves

Shutoff off Subsea Wellheads With Integrators for Medium Pressure Ball–Valves

| Author / Editor: BILL MENZ / Dominik Stephan

SAF 2507 is considerably harder than 300 series stainless steels, with a Rockwell C hardness of up to 32 (HV 318), as compared to AISI 316 and 304 stainless steels, which have a Rockwell B hardness of 90 or less (HV 185).

The stainless steel ferrules on the tube fitting are able to grip even SAF2507 tubing – because they are fully case hardened with the SAT12 service, a patented, low-temperature carburisation process.

Surface hardness of the treated ferrules measures 1200 Vickers – which is comparable to tool steel, or about three times harder than untreated or ordinary stainless steel.

Ductile yet Hard – Carburisation of Stainless Seel Ferrules

This carburisation process preserves the ductility of the stainless steel even as it hardens it. The ductility of the back ferrule enables it to hinge downward onto the tubing, creating a grip on the tubing over a large surface area. This grip helps protect the fitting from vibratory stress.

The result is a tube fitting that can be assembled easily and tightened with simple tools. No electronic swaging unit is required. The connection can be taken apart and remade a number of times. The medium-pressure tube fitting can be checked positively for sufficient pull-up at initial installation with a handheld gauge, a calibrated flat piece of steel that checks for the right distance between the nut and the body of the fitting (Figure 2).

A New Ball Valve Design...

AGI’s beta test of the FKB series medium–pressure ball valve demonstrated that the valve reliably and repeatedly seals over the entire pressure range up to 15,000 psig. The valve’s effectiveness may be attributed to a special type of patent-pending live-loading technology termed ‘direct loading’...

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