Overview
This page contains three different responses to your Oil SSTS SRD, from different suppliers. You must use the output from the URD to assess each response to determine which best meets the URD. The proposed solutions are off the shelf and can not be modified.
Technical Solutions
Solution 1
Overview
The design fully complies with DSA01.1, as far as practicable, and provides separation, water conditioning, oil storage, metering and transfer capability to a tanker, storage, metering and transfer capability to a tanker. The pump can pressurise the flow, under failure conditions to 25 Bar, and is powered from the rigs High Pressure Air Supply (not in SSTS scope however supply and return pipes are – Working pressure 200 bar). Water conditioning provides water for use elsewhere on the rig, could be for fire fighting or washing etc. Water is transferred to separate storage not shown or provided as part of the SSTS. Most of the valves in this solution are manually operated, so will need personnel to monitor the system during operation. A basic control system provides pressure indication in the Well Supply and downstream of the pump, and allows for remote operation of the Well Isolation Valve. The Ball valves are rated to 100 bar and the butterfly valves are rated to 25 Bar, with a closing time of 3 seconds when manually operated. The rig overall provides fire, heat and gas leak detection. The Pressure Relief Valve (PRV) is set at a level to prevent structural deformation/failure of the vessel on which it is attached. The meter provides a digital readout on its body to indicate to the operator the amount of oil passed. This can be reset to zero. By setting the three valves associated with the storage unit flow can be directed to bypass the storage, deliver oil just to the storage or deliver oil just from the storage to the tanker as required by the operator. Pressure from the well head is assumed to be maintained by interfacing system to <20bar to which the SSTS is designed. The storage tank and separator normal operating pressure is 20bar but have been proof pressure tested to 25bar. An automatic pressure relief system is fitted in the supply to the Flame Tower, allowing automatic release of explosive gas to the Flame Tower. The system fully complies with the Control of Noise Regulations with peak levels no greater than 90dbA. The system can be fitted with a portable fire detection capable of detecting smoke.
P&ID
Solution 2
Overview
The design partially complies with DSA01.1, and provides separation, water conditioning, storage, metering and transfer capability to a tanker. The diesel pump can pressurise the flow under failure conditions to 100 Bar. Water conditioning provides water for use elsewhere on the rig, could be for fire fighting or washing etc. Water is transferred to separate storage not shown or provided as part of the SSTS. Most valves in this solution are monitored and automatically operated via the control system requiring a minimal level of personnel to monitor system operation and perform maintenance. The Ball valves are rated to 100 bar and the butterfly valves are rated to 25 Bar, with a closing time of 11 seconds once a command has been received. The system also provides pressure sensing in key locations in order to permit system isolation should the need be required, including the capability to isolate the whole SSTS should input pressure from the well head exceed specific limits i.e. due to failure of well head system. The rig overall provides fire, heat and gas leak detection. The meter provides a digital readout on its body but also to the control system to indicate to the operator the amount of oil passed. The control system records all data from the meter past and present. By setting the three valves associated with the storage unit flow can be directed to bypass the storage, deliver oil just to the storage or deliver oil just from the storage to the tanker as required by the operator. Pressure from the well head is assumed to be maintained by interfacing system to <20bar to which the SSTS is designed. The storage tank and separator normal operating pressure is 20bar but have been proof pressure tested to 25bar.The system partially complies with the Control of Noise Regulations with peak levels no greater than 85dbA. The system can be fitted with a fixed fire detection and suppression system if requested.
P&ID
Solution 3
Overview
Provides separation, water conditioning, oil storage, metering and transfer capability to a tanker. The High Voltage electric pump can pressurise the flow under failure conditions to 100 Bar. Water conditioning provides water for use elsewhere on the rig, could be for fire fighting or washing etc. Water is transferred to separate storage not shown or provided as part of the SSTS. Some valves in this solution manually operated and some are monitored and automatically operated via the control system requiring a low level of personnel to monitor system operation and perform maintenance. The Ball valves are rated to 100 bar and the butterfly valves are rated to 25 Bar, with a closing time of 9.99 seconds (automatic valves). The design meets all international standards. There is the capability to isolate the whole SSTS should input pressure from the well head exceed specific limits i.e. due to failure of well head system indicated to the operator separately by the well head system. The rig overall provides fire, heat and gas leak detection. The design has been developed taking DSA01.1 in to consideration. The Pressure Relief Valves (PRV)s are set at a level to prevent structural deformation/failure of the vessel on which it is attached. There is no system detection of PRV operation. The meter provides a digital readout on its body but also to the control system to indicate to the operator the amount of oil passed. The control system records all data from the meter past and present. By setting the two valves associated with the storage unit flow can be directed to bypass the storage, deliver oil just to the storage or deliver oil just from the storage to the tanker as required by the operator. The Non-Return Valve (NRV) prevents flow of oil into the storage tank downstream of the ball valve. Pressure from the well head is assumed to be maintained by interfacing system to <20bar to which the SSTS is designed however this can be isolated should the pressure increase above this by the butterfly valve. The storage tank and separator normal operating pressure is 20bar but have been proof pressure tested to 25bar. The system partially complies with the Control of Noise Regulations with peak levels no greater than 50dbA. The system is fitted with a standalone fixed fire detection and system, which alarms inside the module only.
P&ID
