Subsea PRODUCTS and PACKAGE

Subsea PRODUCTS and PACKAGE

Subsea PRODUCTS and PACKAGE

Overview

Fully Welded Sub-Sea Ball Valves

Fully welded design.
Bi-directional valve
Trunnion mounted design, with floating rings and allowed cavity pressure relief in both open and closed position.
Single piece floating seat rings.
Body and stem non-metallic seals made in PTFE,
PEEK or similar materials (not in elastomeric materials).
Inconel 625 overlay on seats and seals area (on carbon steel valves).
Electrical continuity between stem, ball and body.
Welding according to API 6A PSL3 and ASME IX.
Piggable.

ABV Subsea R.O.V. Interface
All the ABV S.r.l. Moss® actuators can be designed to be operated also by R.O.V. interface.
The design is usually in accordance with ISO 13628-8 : 2002 (API 17D STD), but ABV S.r.l. can design special interfaces according to customers requirements.

ABV Sub-Sea Gear operator (Manual or by R.O.V.)
ABV Moss® Series Sub-sea Actuators
Sub-Sea Hydraulic Actuators SA-HAD
Hydraulic actuator.
Double acting (single acting on request).
Design life 30 years.
Operable by R.O.V.
Manual override on request
Mechanical/Tactile valve position indicator (remote on request).
Separate flushing ports
Fully pressure equalization to assure complete internal corrosion protection, and to
obtain the required performances at every operating depth.
Possibility of installing the actuator on the valve by means of diver or R.O.V.
assistance.
Pressure containing parts according to ASME VIII.
Power hydraulic oil cleanness according to NAS 6

ABV Moss® Series Sub-sea Systems
ABV has developed a series of valves and actuators suitable for sub-sea service. The design of these systems comes from those for topside service with the implementation due to the external pressure presence and customer requirements in terms of reliability, operability and material corrosion.
ABV has dedicated a special division to the development of sub-sea valves and actuators since, even if the basis is the technology of the standard product, the problems and the technical solutions sometimes are completely different.
The possibility to design and manufacture both the actuator and the valve gives the chance to ABV to realize personalized solutions, to modify easily the data of interface and to optimise the design.
Also from a manufacturing point of view there is a difference between standard production and production of sub-sea systems, since the controls of the materials, the cleanness of the
assembly areas and the testing systems are completely different.
The manufacturing solutions adopted by ABV for the design and the manufacturing of sub-sea systems keeps into account primarily the requirements of the customer and of the technical specifications, that usually are different from design to design.
A general recommendation, valid for systems where a qualified life of 30 years and a high reliability are requested, is the following:


• Top entry or fully welded valves;
• Valves with metallic seal;
• Valves with forged body to avoid castings;
• Actuator body in nodular ductile cast iron;
• Actuator dynamic seal PTFE based to avoid stick-slip effect also after
long period not operated and to have minimum friction;
• Cylinder in stainless steel material;
• Baric compensation;
• Cathodic protection for the whole system.

ABV has realized a study of reliability in cooperation with the University of Parma, with which it was evaluated a set of systems installed from several years of various manufactures and having different construction solutions.
The problems found with more frequency were highlighted and it was made an accurate study to determine the probability of failure, then the most critical points were individualized. The design of ABV’s subsea systems keeps into account the results of this analysis, foreseeing appropriate solutions for the various problems.
We have found that there were various needs, among with to realize particular redundant sealing, to use solutions that avoid the stick-slip phenomenon and to compensate the system to the pressure.
The baric compensation is a factor extremely important for reasons of internal corrosion and guarantee of performances at all depths.
The actuator and the spool refilled in with biodegradable oil and the equalization of the pressure between internal and external can be realized with different systems, which vary depending on the type of actuator and the characteristics of the project.
In this way it is possible to design systems with high reliability for depth up to 2500 meters and more.