Pulse™ high-flow ultrasonic chemical injection metering valves (CIMVs) are designed for injection of monoethylene glycol (MEG) and methanol as part of a subsea hydrate mitigation strategy. They have been developed to handle the contaminated regenerated MEG stream.

At the heart of this CIMV technology is a large-bore, nonintrusive, line-of-sight, ultrasonic flowmeter. The robust, particulate-tolerant nature of these high-flow CIMVs means that no subsea filtration of the MEG or methanol is required.

Mitigate hydrate formation with methanol or regenerated MEG.

Obtain accurate measurement with very low pressure drops

The large-bore, line-of-sight flowmeter fires an ultrasonic pulse with and against the flow, measuring the difference in time of flight in the two directions. The difference in times indicates the speed of the fluid, enabling accurate calculation of the flow rate. As with other members of the Pulse ultrasonic CIMV family, a secondary flow measurement system is supplied as standard; it consists of two pressure sensors across the throttling valve and a rotary variable differential transformer (RVDT) to provide valve position. Processing at the system level can then be used to convert the data to flow rates.

Precisely regulate flow

The Pulse high-flow CIMV uses field-proven multiple orifice valve (MOV) choke trim technology to provide an erosion-resistant throttling element. The MOV trim consists of two sintered and hot isostatic pressed (HIP) tungsten carbide discs, one fixed and the other rotated by a stepper motor via a gear train. Both discs have specially shaped, extended-range orifices that when rotated relative to each other, easily achieve a turndown ratio in excess of 135:1 with very fine system adjustment.

• Insert-retrievable, self-regulating metering valve
• Flow range 42 to >7,000 galUS/h [160 to >26,500 L/h]
• 1.5-in [38.1-mm] nominal throughbore coupler
• Proprietary, large-bore, nonintrusive, line-of-sight, ultrasonic flowmeter
• Accuracy better than ±3% of reading
• Minimum pressure drop through CIMV <100 psi [<6.9 bar]
• Maximum working pressure 10,000 psi [690 bar]
• Maximum water depth 10,000 ft [3,048 m]
• Insert weight approximately 551 lbm [250 kg] in water
• Vertical mounting on tree or manifold
• Controller Area Network (CAN bus), CiA^® 443, or Modbus^® communication   
• Redundant flow measurement system
• Onboard control and diagnostics

Pulse is a mark of SLB. Other company, product, and service names are the properties of their respective owners.