ANSI API RP 17M:2004 pdf download
ANSI API RP 17M:2004 pdf download.Recommended Practice on Remotely Operated Tool (ROT) Intervention systems.
l) 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.
z) All tool functions should have visual subsea status and position indicators visible from ROy, clearly indicating the respective function status. Operations passing through several discrete steps, shall clearly identify the various stages of the operations.
aa) Provisions for emergency lifting should be included on all ROT systems.
4.2 Deployment and landing requirements and recommendations
This subclause contains functional requirements and recommendations for the ROT system during the deployment and landing phases of the intervention task.
a) ROT operations in which sensitive components, as part of the subsea system, are involved shall be carried out in a two-step sequence. The ROT shall be landed and sufficiently secured prior to manipulation of sensitive components, e.g. hydraulic lines.
b) The number of lines from the surface to the subsea work area should be minimized, to reduce the possibility of entanglement.
c) When an ROT system is deployed in a guidewireless operation, lateral and rotational control of the ROT system is required while entering into the subsea area in which sensitive components are exposed at the same level as the ROT.
d) If heave compensation on the ROT system liftwire is not specified, the ROT shall be designed for a vertical motion while on guidepost(s) and during landing. The design shall include a combination of crane-top motion amplitude, winch speed and the vessel period. Any potential amplification effects of crane-top motion down to the ROT shall be included.
e) The guidewire system on-surface should allow asymmetrical adjustment of the distance between the guidewires relative to the lifting point.
f) The guidewire winch(es) should be capable of installing replaceable guideposts.
g) The guidefunnels on the ROT shall enable simple and efficient entering and securing of the guidewires and eliminate trapping of the wires.
h) In order to achieve safe operation, the ROT and the transportation skid should enable entering on tensioned guidewires.