API RP 17M:2004 pdf download

API RP 17M:2004 pdf download.Recommended Practice on Remotely Operated Tool (ROT) Intervention Systems.
SPS field layout.
b) The following considerations should be taken into account for module replacement:
operational issues with respect to the vessel, e.g. simultaneous operations between subsea intervention and drilling or completion activities;
environmental aspects, including e.g. water depths, current conditions and seabed conditions;
— access at the subsea location;
replacement in one or two tooling missions;
— mass and dimensions of module to be replaced.
4 Functional requirements and recommendations
4.1 General
This subclause contains general functional requirements and recommendations for the elements within the various options of ROT intervention systems and interfacing equipment.
a) The ROT intervention system shall be designed to be as small, simple, reliable and robust as possible, to ensure safety of personnel and to prevent damage to the intervention system, the SPS and/or the environment. No single failure should result in reduced safety for the involved personnel, or cause damage to involved equipment and/or the environment (consider redundancy in order to minimize the probability of failure).
b) The ROT functional requirements shall reflect its multiple use over the design life of the SPS.
c) The ROT intervention system shall be designed to allow for safe and easy operation, maintenance, repair and replacement of components.
d) Operations of all functions in the ROT intervention system shall be optimized with regard to duration.
e) Priority should be given to reduce the time required for mobilization/demobilization onboard the intervention vessel.
f) Functionality and operability of new ROT intervention concepts shall be documented in design and by testing under realistic conditions.
g) All intervention tasks shall be possible to suspend in a safe manner. It shall be possible to resume a task suspended due to equipment failure or adverse weather conditions.
h) All ROT operations should be fully reversible at any stage.
I) All tool functions, which upon failure may prevent retrieval of the ROT system to surface, shall have override features. These shall include release from both the permanently installed subsea systems as well as from sealines and replaceable components.
j) In case of a vessel drift-off, a weak-link or safe disconnection/release method shall be installed between the ROT system and the liftwire/umbilical. The ROT locking mechanism against the SPS should ensure that the ROT is not locked to the structure before the weak-link is established.
k) A weak-link or a fail-safe system should be included on all physical connections between ROT and ROy.
I) All elements in the ROT intervention system shall be certified for an SWL to suit the maximum expected load conditions during testing, transport and offshore operations. Mass of the module to be handled by the ROT should be included.
m) The ROT intervention system shall be designed for temperatures in the range 0 °C to 50 °C (32°F to 122 °F). For operation and storage temperatures below 2 °C (35,6 °F), critical components shall be tested and documented for temperatures down to —18 °C (—0,4 °F).
n) The ROT system should be designed for long-term storage.
o) All equipment included in the ROT system shall be designed to withstand vibrations during transportation and operation in accordance with applicable regional regulations and actual conditions.
p) The ROT systems should allow operations from vessels such as mobile offshore drilling units simultaneously
with drilling and completion activities. The following should be considered:
1) relative offset between launch position and landing area;
2) stack-up height, including height of the ROT system, the component/module to be installed and the umbilical sheave arrangement;
3) mass of the ROT system, including the component/module, shall be minimized for handling purposes.
q) The ROT system should be designed to be run through a moonpool or over the side, both from a semi- submersible or from a monohull vessel.
r) The ROT intervention system should enable deployment of modules in any vessel heading relative to the subsea system.
s) ROT designs should give consideration to ROV operations during ROT use.
t) The ROT system shall be well balanced, with the resulting CG point directly below the handling cable attachment point prior to pick-up.
u) The ROT shall be designed for efficient launching on guidewires.
v) Cutting-loops, or similar solutions, shall be included for hydraulic functions with override possibilities in order to enable cutting of the loops with an ROV and hence prevent pressure lock in the respective hydraulic function.
w) Sensitive components or items which may be damaged during running, landing, operation, ROV involvement or interactions with wires, shall be protected against worst-case load condition.
x) Active hydraulic or electric components should not be left subsea in an activated mode.
y) Snagging points for guidewires, liftwires and umbilicals shall be avoided on the ROT system.