SepraSol™ Liquid/Gas Coalescers

Clean, aerosol-free gas is critical to equipment reliability and the economic efficiency of gas processing, petroleum refining, and chemical processing applications. Pall SepraSol™ liquid/gas coalescers remove liquids and solids from contaminated gases with high efficiency and reduce operating and maintenance costs. 

 

SepraSol™ liquid/gas coalescers come with the patented oleophobic/hydrophobic treatment that lowers the medium's surface energy and promotes rapid drainage of the coalesced liquids. It enhances the capacity for liquid challenges and results in improved performance allowing for smaller systems, lower pressure drop, and improved ability to recover from liquid slugs.

 

Pall’s SepraSol liquid/gas coalescers eliminate virtually all solids and liquids in a gas stream. Downstream liquid levels are as low as 0.003 ppmw¹, and the solids removal rating is 0.3 micron (μm) (99.99% efficiency)²

 

¹ Test conditions used to measure efficiency area are as follows:

Flow rate: 900 SCF/minute per 30 in. element at 37.8°C (100°F) and 6.9 bar (100 psig)

Liquid inlet: 50 ppmw oil

² Per sodium chloride test

 

Why choose Pall SepraSol™ Coalescers?

• More rapid liquid drainage
• Lower saturated pressure drop
• Faster recovery from liquid slugs
• Reduced capital and operating costs
• Improved product quality and consistency
• Minimized vessel diameter due to fewer restrictions on annular velocity
• Fewer element changeouts needed
• High solids removal efficiency
• Reduced liquid losses
• Optimum protection of downstream equipment

 

Additional Features of the Pall SepraSol Liquid/Gas Coalescing Filter

Performance Specification

 

Solid Removal Rating	0.3 μm (99.99%)
Temperature Rating	180 °F (82 °C)
	150 °F (65 °C) with Water
Clean & Saturated Pressure Drop	Sized to your specification

Figure 1: Effect of Pressure Drop on Compressor Operating Costs⁵

⁵ Conditions: Delta P on inlet pressure

Inlet Pressure = 20 psia

Outlet Pressure = 200 psia

Gas compressed is methane

Costs based on $0.07/kwhr

 

Pall Corporation applies a patented oleophobic/hydrophobic chemical treatment on all of its SepraSol liquid/gas coalescers. This allows the coalescers to operate at a lower saturated pressure drop. As shown in Figure 1, a small difference in saturated pressure drop can result in significant savings in operating costs.

 

About Coalescer Efficiency Ratings

 

The measurement of the efficiency and the pressure drop of a coalescer should reflect operating conditions. Many manufacturers of coalescers measure efficiency using the dioctyl phthalate (DOP) test. The DOP test was not originally designed to measure the performance of a coalescer under operating conditions seen in the oil and gas industry. Rather, the DOP test is performed under the following conditions:

• Measures only capture efficiency and does not indicate how much liquid is at the coalescer outlet. It is the outlet concentration, which will indicate whether downstream equipment and processes are vulnerable to damage.
• Measures only the percent removal of DOP aerosols that are 0.3 μm compared to a range of sizes normally seen in oil and gas applications.
• Measures the removal of DOP, a liquid not typically found in oil and gas applications.
• Performed under a vacuum, not typical of operating conditions.
• Performed on a dry coalescing element, the effectiveness of a coalescer should be measured when a coalescer is completely saturated.

Pall has developed a test called the Liquid Aerosol Separation Efficiency (LASE) Test to specially measure the performance of a coalescer under operating conditions. The table below compares the LASE and the DOP tests. For further details on the LASE test, see Pall literature GAS-4300b, "Recent Developments in Performance Ratings of Gas/Liquid Coalescers ."

 

Pall LASE Test vs. Conventional DOP

	Pall LASE Test	DOP Test	LASE Advantage
Efficiency Rating	Measures ppmw of total downstream aerosol concentration	Measures only the capture efficiency of 0.3 μm DOP aerosols	Specifies performance based on total liquid removal
Test Contaminant	Polydispersed 20 wt. compressor lube oil (size range 0.1-1.0 μm)	Monodispersed dioctyl phthalate (size range at 0.3 μm only)	Closely simulates actual process contamination
Downstream Contaminant Measurement	Full flow membrane sampling of all size contaminants	Indirect light scattering of 0.3 μm contaminants	Directly measures the amount of all liquid downstream
Pressure Conditions	Performed under positive pressure conditions	Performed under vacuum	More closely reflects actual process pressure conditions
Cartridge Condition	Performed on a saturated cartridge	Performed on dry cartridge	Reflects actual process cartridge service
Pressure Drop Measurement	Measures operating saturated cartridge pressure drop	Measures dry cartridge pressure drop	Provides a more realistic service pressure drop

Nominal Cartridge Dimensions

 

Part Number	Outer Diameter (mm/in.)	Length (mm/in.)	Surface Area (m2/ft2)
CC3LGA7H133	70/2.75	762/30	0.88/9.5
CC3LGB7H134	70/2.75	762/30	0.88/9.5

 

³ CC3LGA can replace CC3LG7 in existing Pall coalescing housings.

⁴ Completely compatible with amines and ammonia.

SepraSol™ liquid-gas coalescers are widely used in various oil & gas, chemicals, and polymer industry applications, including –

• Protecting compressors and turbines 
• Protecting low and ultra-low NOx burners by cleaning fuel gas 
• Removing lubrication oil, water, compressor wear products, corrosion products, and other solids from effluent gas streams 
• Minimizing foaming tendencies in sweetening and dehydration units 
• Minimizing amine and glycol losses downstream of gas sweetening and dehydration units 
• Cleaning dirty fuel gas and instrument gas 
• Controlling injection well plugging during gas flooding 
• Protecting catalysts, desiccants, and absorbants 
• Removing lube oil from ammonia gas

1. Why should I use Pall SepraSol™ Coalescers?

Pall SepraSol™ Liquid/Gas Coalescers efficiently remove liquids and solids from contaminated gases with a range of benefits, including –

• More rapid liquid drainage
• Faster recovery from liquid slugs
• Reduced capital and operating costs
• Improved product quality and consistency
• Fewer element changeouts needed
• High solids removal efficiency
• Reduced liquid losses
• Optimum protection of downstream equipment

 

2. What are the benefits of patented oleophobic/hydrophobic treatment in SepraSol™ coalescers?

The patented oleophobic/hydrophobic treatment in SepraSol™ liquid gas coalescers offers a range of benefits. It lowers the surface energy of the medium and promotes rapid drainage of the coalesced liquids. The chemical treatment enhances the capacity for liquid challenges and results in enhanced performance, allowing for smaller systems, lower pressure drop, and improved ability to recover from liquid slugs.