5. ALTERNATIVAS DE TRATAMIENTO DE AGUAS SERVIDAS EN BASE A COLECTORES
5.2. ALTERNATIVAS DE TRATAMIENTO
5.2.1. Sistemas de Tratamiento del Tipo No Convencional
The interconnect cable assembly connect the air remote control panel to the accumulator unit. It consists of a multi-tube bundle with a hose-end half of an air junction box on each end. These junction boxes should be attached to the mating junction boxes on the interface assembly and the air remote control panel. One interconnect cable assembly is required for each air remote control panel. The cable consists of 3/8" OD, 175 PSI working pressure polyethylene tubes spirally wound and encased in 3/16" thick polyvinyl chloride (PVC) outer jacket. Two (2) tubes are required for each function and one (1) each for the pressure regulating and monitoring signals.
4.8 ACCESSORIES
There are optional items that can be added to the BOP control system to increase the functional capability. Accessories include: (1) nitrogen backup system, (2) rig test outlet, (3) rig skid outlet and (4) alarms. The following will provide functional descriptions and operation instructions:
4.8.1 Nitrogen Backup System
The nitrogen backup system - This system connects to the control manifold to provide an emergency pressure power source to close the ram type preventers and gate valves. This system should be used only as the last possible means of control.
1. The nitrogen backup system consists of:
a. Nitrogen bottles - charged to 2200 PSI. The nitrogen bottles connect to the manifold on the high pressure supply side of the manifold regulator bypass valve. This direct the nitrogen pressure to flow through the control valve(s) to operate the preventers even though hydraulic pressure is not available. The bottle valves are in full open position during normal operation.
b. Shut-off valves - which are closed during normal operation, and must be manually opened to begin nitrogen flow. This valve location should be familiar to operator personnel to enable quick and correct use. c. Check valves - which direct nitrogen toward control valves only and do not allow back-flow to fill up the
accumulators.
d. Nitrogen pressure gauge - 0-5000 PSI. This gauge reading should be observed daily. Nitrogen pressure should be maintained at 2200 PSI.
Produced By: Entrada International, Inc. 2002
Page 35 of 91
2. To operate the nitrogen backup system during emergency situations.a. Move the Manifold Regulator Bypass Valve (Item 26 Fig. 4-1) to HIGH pressure position. Perform this operation from point of quickest access. If possible operate from the remote panel before power supplies are shut down.
b. Open the nitrogen system shutoff valve. This operation must be done manually at the unit.
c. Operate the desired ram preventers or gate valves. Do not attempt to operate the annular. Nitrogen flow is not directed through this function and will only waste time and pressure.
4.8.2 Rig Test Outlet
This assembly provides a 6000 PSI working pressure test outlet from the accumulator unit. 1. The test outlet consists of:
a. Rig test isolator valve - is open during normal operation. b. Rig test pressure gauge - 0-10,000 PSI.
c. Rig test relief valve - 6500 PSI.
d. Rig test shut-off valve - is closed during normal operation. e. Rig test check valve.
2. To operate the rig test outlet:
a. Connect a 6000 PSI line fitted with 6000 PSI bleeder valve (supplied by customer) from rig test outlet to equipment to be tested and a return line to the reservoir for vented fluid.
b. Close rig test isolator valve. c. Open rig test shut-off valve.
d. Check that Air Pump Suction Valve (Item 11 Fig. 4-1) is open and customer furnished bleeder valve is closed.
e. Open the air supply valve for the air pump connected to the rig test outlet and then shut it when test pressure is reached.
f. Slowly open customer furnished bleeder valve and vent fluid back to reservoir. 4.8.3 Rig Skid Outlet
This assembly provides a 3000 PSI outlet for connection to the rig skid control manifold for operation of rig skid cylinders.
1. The skid outlet consists of:
a. Rig skid isolator valve - is open during normal operation. b. Rig skid pressure gauge - 0-6000 PSI.
c. Rig skid shut-off valve - is closed during normal operation. d. Rig skid relief valve - 3500 PSI.
2. To operate the rig skid outlet to the rig skid outlet:
a. Connect 3000 PSI line from the rig skid outlet to the rig skid control manifold and a return line to the reservoir from the rig skid control manifold.
b. Close the rig skid isolator valve. c. Open the rig skid shut-off valve.
d. Operate the control valves of the rig skid manifold several times to purge the system of air. 4.8.4 Alarms
Alarm Systems of audio (horn) and visual (flashing red light) signal can be added to the BOP control system. These alarms require a customer supplied 120 volt AC power supply hookup at installation with cable connection of 0.375" to 0.500" diameter. The alarms include use of the lamp test/acknowledge button which deactivates the horn alarm. The flashing red light signals until the system is restored to normal operating conditions. The alarms are activated by pressure switches.
1. The low accumulator pressure alarm pressure switch is activated when the system pressure drops to 2200 PSI.
2. The low fluid level alarm pressure switch is activated by a float switch in the reservoir. When fluid level is low, the float switch vents the air supply to the pressure switch.
Produced By: Entrada International, Inc. 2002
Page 37 of 91
5 MAINTENANCE INSTRUCTION5.1 INTRODUCTION
A regularly scheduled maintenance Program must be developed to sufficiently maintain the BOP Control System. The operator must develop an appropriate program based on the operating, testing and drilling programs, The entire control system should be tested a minimum of once a week, This may simply involve operating alt functions (remotely as well as from the unit) and noting gauge and meter readings. A good maintenance program must be developed whether the operator chooses a very simple or a very thorough test program.
Installation, maintenance repairs and adjustments around high pressure and electrical equipment must be done with careful concentration and caution to ensure the safety of all personnel. Pay particular attention to all notes, cautions, and bold type words as these are to ensure safety during all phases of equipment use.
PAY PARTICULAR ATTENTION WHEN WORKING AROUND AREAS WITH: A. Exposed electrical terminals.
B. Remotely operated equipment. C. High pressure hydraulic lines.
a. Remove all pressure from lines before disconnecting Fittings or splicing. Verify line pressure is released before attempting to disconnect.
b. Protect system and lines when welding in nearby areas. Weld solder will damage the hose as well as contaminate the system fluid.
FOR SAFETY DURING MAINTENANCE PROCEDURES:
A. Work in pairs so there is a backup in case of emergencies. B. Ensure electric tools are grounded.
C. Ensure tool handles are insulated.
The instructions below are major steps that must be performed during maintenance and troubleshooting procedures. Wherever these instructions are given, refer to these steps.
Stop Pumps
1. Close air supply valves.
2. Turn triplex starter to OFF position. Start Pumps
1. Open air supply valves.
2. Turn triplex starter to AUTO position.
The following items should be maintained on a monthly basis until the operator can develop a suitable program based on his specific operating and testing programs. All activity concerning the BOP accumulator unit should be documented. This shall include lubrication, addition of fluid, purging of filters, draining of moisture traps, malfunctions, and repairs, etc. The time, date, and name of person performing the function should be recorded.