Retriever and Service Valve
For the safe replacement of coupons and probes during operation in pressurized pipelines or vessels, a retriever and service valve are used. The retriever is a precision tool that allows various equipment and tools to be safely and easily inserted and removed through the access fitting without reducing the pipeline pressure. Using the service valve, the system pressure is safely transferred to the tool, allowing the valve to be opened and the retriever operation to be carried out.
The main components of the retriever include: a Stationary Inner Barrel, Threaded Adapter, Movable Outer Barrel and Mandrel Rod, and Socket Adapter Assembly. Sealing within the unit is achieved with Viton O-rings, PTFE back-up rings, and graphite impregnated PTFE seals.
A bleeder valve assembly incorporated in the retriever allows product bleed-off away from the operator for safety and cleanliness. A pressure gauge is also incorporated which shows the pressure inside the tool. This is extremely useful when pressurizing and depressurizing the tool. The bleeder valve Assembly can also be used for back pressuring and product sampling.
Each retriever kit component assembly is furnished with service tools and an ample supply of spare parts. Parts subject to wear with normal use are available in Repair or Seal Kits.
Service valves are lightweight, portable, and equipped with 2-inch ball valves featuring a full-bore opening and one or two bleed valves. These types of service valves connect the retriever to 2-inch access fittings.
The bodies of the retriever and service valve are typically made of 316 or 316L stainless steel in accordance with ANSI/NACE MR0175/ ISO 15156 (Related to sour environments) standard requirements, and customer specifications. In environments with very severe corrosive conditions, materials with higher corrosion resistance, such as Duplex stainless steel, Nitronic, Inconel 625, and …, can be used.
Retrievers and service valves are available in various sizes and corrosion-resistant materials, depending on the length of coupon holders or probes, and can be provided in two pressure classes: 3600 psi and 6000 psi.
