DSP Subsea Leak Monitor 

The basic theory is that a leak creates a very high-frequency noise that can be monitored by an ultrasonic sensor. In a «non-leak» situation the ultrasonic pattern will be stable, but when a leak occurs the signature will change drastically. ClampOn’s DSP technology distinguishes and eliminates background noise unrelated to leakages so that the hiss from the leaks can warn the operator.  The system also includes a program or data-base that helps to monitor and indicate the volume of the leak.

The ClampOn DSP Leak Monitor is the result of a joint venture project involving several participants in the petroleum industry.

The ClampOn DSP Leak Monitor is designed to be installed at critical points such as valves, flanges, joints, etc., and can monitor very small leakages. A pressure differential of as little as 1 bar can be monitored in gases, and 3 bar in liquids.

 

 

• Designed for a service life of more than 25 years
• Independent redundant electronics
• Independent high and atmosphere pressure chambers
• Electron beam (EB) welding of the chamber against external pressure (no rubber or mechanical seals)
• Glass-metal penetrator as a barrier between high and atmosphere pressure chambers
• Outstanding sensitivity, repeatability, accuracy and signal/noise ratio thanks to Digital Signal Processing (DSP-06)

 

A leak in an oil or gas flow line is a highly dangerous situation – upstream as well as downstream, so it is extremely important for the operator to be warned about any leak immediately should it occur.

 

A leak in a flow line, valve, flange or any other component can compromise safety and may also lead to a shutdown at the production stage or down-stream at a refinery or terminal.

 

A product leak normally has a very low flow-rate, which is determined by the size of the defect, the properties of the fluid and the pressure differential. There are a number of advantages in using the DSP Leak Monitor to monitor valves:

 

The ClampOn DSP Leak Monitor helps operators identify and quantify sources of gas/liquid leakages, thus enabling them to take appropriate action. Customers have successfully used the ClampOn Leak Monitor to identify cross-flow in valves connected to the manifold.

 

Our instruments can easily be integrated into any existing or new control system. A computer with our software is often used in-between our instruments and the control system. The computer will be used for calculations and all recorded data will be stored for analyzing and calibration purposes.

 

We always recommend using the digital interface due to following benefits:

	COMPACT MODEL	DEEPWATER MODEL
Water depth	3000m	4500m
Max. operating pressure barA	300 (4351psi)	450 (6526psi)
Max. test pressure barA	333 (4829psi)	675 (9790psi)
Housing material	Titanium	Titanium
Dimensions excl.ROV handle	ø90 x 324mm (ø3.5” x 12.8”)	ø150 x 359mm (ø5.9” x 14.1”)
Dry weight, kg (lbs)	5.2 (11.5)	15.0 (33.1)
Hose/jumper interface	Bennex or ODI	Bennex or ODI
Independent redundant electronics/single electronic	Yes	Yes
Gasket/sealing	No	No
EB welding	Yes	Yes
Glass-metal penetrator
Low pressure / high pressure chamber	Yes	Yes
ROV installation/retrieval	Yes	Yes
Retrofit clamp/funnel	Yes	No
Power Supply	12-28VDC	12-28VDC
Current draw	Approx. 70mA @ 24VDC	Approx. 70mA @ 24VDC
Design Lifetime (MTBF)	220 000 hours (25 years)	220 000 hours (25 years

 

ClampOn has since the beginning in 1994 grown to be the largest supplier of passive ultrasonic systems for sand/particle monitoring to the international oil and gas sector.

 

All products supplied by ClampOn, particle monitor, PIG detector, corrosion-erosion monitor, vibration monitor and leak monitor are based on the same, well proven technology platform. Both the topside and the subsea instruments incorporate Digital Signal Processing (DSP), complete digitalization eliminating analogue filters, circuits and amplifiers.

The ClampOn Ultrasonic Intelligent Sensor processes all data in the sensor itself (patented principle), thus enabling the instrument to discriminate between sand-generated and flow-generated noise. This is of importance to the user since changes in flow rates and the gas/oil ratio will not affect the performance of the system.

A good signal to noise (s/n) ratio is vital for quality measurements of this sort, and ClampOn’s sensors are the very best in this respect. With the new version, the external noise has been completely eliminated.
The sensors has memory capacity for storing up to 60 days of data, and can even be reprogrammed between being a sand monitor, a PIG detector or a leak monitor.

 

ClampOn Ultrasonic Intelligent Sensor

• Non-invasive
• Digital Signal Processing (DSP)
• Complete digitalisation
• No analogue filters, circuits or amplifiers
• Two-way communication
• Real-time measurement
• Easy to relocate
• Contains no moving parts
• Can be mounted in hostile environments
• Incorporates sensitive, intelligent, intrinsically safe sensors
• Can be upgraded by software download
• Can store up to 60 days of  measurement data within the sensor itself
• Self-testing capabilities
• Built-in temperature sensor and  accelerometer (optional)
• User-friendly software for Windows™ XP/Vista/2000-2008
• Versatile - one and the same sensor can perform particle detection, PIG detection, spectrum analysis and more, all available in the software package of your choice.