API SPEC 17F:2003 pdf download
API SPEC 17F:2003 pdf download.Specification for Subsea Production Control Systems.
3.10
oftset
horizontal component of CPL
response time
sum of the signal time and the shift time
3.12
running tool
tool used to operate, retrieve, position or connect subsea equipment remotely from the surface
NOTE An example is the subsea control-module running tool.
3.13
shift time
period of time elapsed between the arrival of a control signal at the subsea location and the completion of the control function execution
NOTE Of primary interest is the time to fully stroke, on a subsea tree, a master or wing valve that has been designated as the underwater safety valve.
3.14
signal time
period of time elapsed between the remote initiation of a control command and the initiation of a control function operation subsea
3.15
subsea production control system
control system operating a subsea production system during production operations
3.16
surface-controlled subsurface safety valve
scssv
safety device that is located in the production bore of the well tubing below the subsea wellhead, and that will close upon loss of hydraulic pressure, as defined in ISO 10432
NOTE Its function is to provide closure of the well flow in the event of catastrophic loss of the primary flow control safety equipment provided by the subsea tree assembly, or when commanded from the surface facility, e.g. in the event of an emergency shutdown Level 0.
3.17
surface safety valve
ssv
safety device that is located in the production bore of the well tubing above the wellhead (platform well), or at the point of subsea well production embarkation onto a platform, as defined in API RP 14H, and that will close upon loss of hydraulic pressure
3.18
umbilical
group of electric cables, hoses or steel tubes, either on their own or in combination (or with optical fibre cables), cabled together for flexibility and oversheathed and/or armoured for mechanical strength
3.19
underwater safety valve
usv
safety valve assembly that is declared to be the USV as defined in API RP 14H and will close upon loss of hydraulic pressure
g) umbilical;
The umbilical(s) transfers electrical power and signals, hydraulic power, and/or chemicals to the subsea components of the subsea production system. Signals may be transmitted via power cable (signal on power), signal cable or fibre optic.
h) subsea control module (SCM);
In a piloted-hydraulic, electrohydraulic or electric control system, the SCM is the unit which upon command from the MCS directs hydraulic fluid to operate subsea valves. In an electrohydraulic system the SCM also gathers information from sensors located subsea and transmits the sensor values to the topside facility.
I) subsea distribution systems;
Distribution systems distribute electrical, hydraulic and chemical supply from the umbilical termination(s) to the subsea trees, manifold valves, injection points, and the control modules of the subsea production control system.
j) subsea located sensors;
Sensors located in the SCMs, or on subsea trees or manifolds, provide data to help monitor operation of the subsea production system.
k) control fluids;
Oil-based or water-based liquids that are used to convey control and/or hydraulic power from the surface HPU or local storage to the SCM and subsea valve actuators.
I) control buoy.
A moored buoy housing generation, communication and chemical injection (optional) equipment. The buoy is connected to the subsea components of the subsea production system via an electrical/fibre optic/hydraulic control umbilical. The buoy can communicate with the surface production facility via acoustic, radio or satellite links or a combination thereof.
This part of ISO 13628 covers all systems, both hydraulic and electrohydraulic. Only the relevant clauses should be used.
5.1.2 Service conditions
5.1.2.1 Suitability for working environment
The subsea control system shall be designed and operated with consideration for the external environment. For surface facilities, this will include climatic conditions, corrosion, marine growth, tidal forces, illumination, and hazardous area classifications. For the subsea environment, this will include corrosion, ambient pressure and temperature, and maintenance considerations.
Product designs shall be capable of withstanding design pressure (rated working pressure) at rated temperature without degradation, exceedance of allowable stresses, or impairment of other performance requirements for the design life of the system.
5.1.2.2 Pressure ratings
5.1.2.2.1 General
The design shall take into account the effects of pressure containment and other pressure-induced loads. Specialized conditions shall also be considered, such as pressure rating changes in system and component interfaces (such as subsea control module to receiver plate, umbilical to tree-mounted terminations) and pressurizing with temporary plugs and caps installed. The effects of external loads (i.e. bending moments, tension), ambient hydrostatic loads and fatigue shall be considered.
