CHEMICAL METERING SKID (CMS)

The CMS is designed for metered injection of liquid demulsifiers and corrosion inhibitors into the oil transfer and treatment pipes for oil emulsion breaking, and line and equipment protection against corrosion, paraffin deposits, etc.

The chemical metering skid consists of process and equipment compartments (standard configuration).

THE PROCESS COMPARTMENT INCLUDES:

A metering pump for continuous volumetric dosing of liquid demulsifiers and corrosion inhibitors
Electrical injection pump units of plunger or diaphragm type, that provide continuous volumetric dosing of chemicals
A gear pump for batch mixing of the chemical and maintaining its temperature within specified limits
A welded feed tank of rectangular section for metered injection of specific amounts of liquid demulsifiers and corrosion inhibitors into the pipeline within a specified period of time
A welded non-pressure process tank of rectangular section for chemical storage and preheating equipped with an electric heater, a level sight gauge with a ruler, upper and lower limit level detectors, and a filler neck with a filter and a breathing opening
Instruments for process parameters control and control panels

THE EQUIPMENT COMPARTMENT HAS A CONTROL CABINET WITH THE FOLLOWING FUNCTIONS:

Automatic filling of the process tank with the chemical and automatic stop of the gear pump when the tank filling is completed
Local control of the chemical pressure and temperature
Automatic temperature control of the electric heater installed in the tank
Automatic temperature control of the electric heating in the control cabinet
Manual local control of the metering pumps, fan, electric heaters and lighting
Automatic shutdown of metering pumps at the pressure increase and minimum level of the chemical in the process tank
Keeping air temperature in the compartments within specified limits
Process equipment alarm indication
Short circuit protection of the lighting electrical circuits
Monitoring and control for process equipment of various design with a possibility of remote control and skid connection to the upper level PCS
Explosion-proof electrical equipment and instruments, and cables and wires with copper conductors

MAIN ADVANTAGES OF THE CHEMICAL METERING UNIT

Strainers on the suction line of each metering pump
Strainer on the injection line to the tank
Easy to adjust the metering pump capacity
Containers for collecting leaks from metering pumps
Methanol injection skids have pipelines for metering pump washing

Features

THE CHEMICAL METERING SKID MAY HAVE VARIOUS DESIGNS DEPENDING ON:

Metering pump capacity and type
Quantity of metering pumps
Availability and quantity of feed tanks
Availability of a control cabinet or panel
Availability of a controller
Availability of a flowmeter

Technical specifications

Parameters	Unit	Value
Metering pump capacity	l/h	up to 6300
Metering pump operating pressure	kgf/cm²	up to 400
Fluid kinematic viscosity	cSt	up to 800
Fluid temperature	°С	+20... +60
Feed tank capacity	m³	up to 6
Operating mode		continuous
Operating fluid		Chemicals
Climatic category as per GOST 15150		U, UKhL1, KhL
Explosion hazard zone category as per PUE (Electrical Installations Code)		V-1 a
Fire hazard category as per NPB 105		A
Fire resistance rating as per SNiP 21.01		III
Power supply	Three-phase AC network, 380 V, 50 Hz