IN-LINE ROTARY SEPARATOR

Bringing energy and the environment into harmony.®

IRIS®

IRIS®

is suitable for compressors or metering duty.

Liquids can be separated and extracted ahead of flow meters in gas transmission lines. IRIS rotary separators can also clean up gases at compressor inlets and provide liquid and gas separation for most applications where liquids need removal from the process gas. The IRIS unit offers a smaller, lighter and lower total installed cost separation system compared to traditional systems. Its unique design facili-tates easy retrofit installation into nearly all process piping. The unit is ideally suited for ser-vice in applications with limited space. It requires no operator intervention and minimal mainte-nance.

PRINCIPALS OF OPERATIONThe IRIS separator uses inlet gas pressure directed through

static nozzles to create a high-velocity swirling flow

inside a rotating drum. As the gas flows through the inlet swirl generator, it creates a vortex at the inlet section of the rotor. Inside

COMPACT GAS-LIQUID SEPARATOR FOR GAS SERVICE The IRIS®unit is a horizontal, compact, gas-liquid separator for in-line pipe installations. There are three models: 3-inch (80 DN) 600 #CL; 6-inch (150 DN) 600 #CL; and 6-inch (150 DN) 900 #CL. Each contains a rotary drum that uses the gas energy to spin liquids out of a wet gas stream. Its compact design allows it to be installed quickly, with minimal changes required to the existing installation to achieve immediate results.

The IRIS separator can be as little as one-tenth the size and weight of a conventional static separator and requires less instrumentation. Separation effi-ciency meets or exceeds that of

static separators and provides a gas outlet quality that

In-line Rotary Separator

The IRIS in-line rotary separator

is a compact, gas-liquid separator

designed to separate liquids from

a gas stream in applications where

even small amounts of liquid can

cause extensive damage.

Bringing energy and the environment into harmony.SM

the rotor drum, the swirling gas imparts energy to the drum and vanes causing the rotor to spin at a high rotational speed. The free vortex inside the rotor applies a high centrifugal force to the wet gas particles and throws them onto the rotating drum. The tapered surface of the rotor pumps the attached liquid to the large end of the drum where it is discharged to the drain collector. The liquid is then discharged to a drain system for disposal.

The IRIS separator is designed to handle wet gas streams with up to 30 percent liquid mass frac-tion and nominal gas velocities at the inlet in the range of 15 to 60 ft/sec. It has a turn down ratio of 66 percent from the design condition, and flow capacity increases linearly with pressure. Trim plates are used to size the IRIS unit for site flow conditions and allow it to be re-rated for future conditions.

KEY DESIGN FEATURES ■ In-line installation (easy retrofit) ■ ANSI flange connections ■ Low maintenance bearings■ Self-powered, free spinning ■ Self-clearing of liquids and solids ■ Simple, robust design ■ Simple, minimal maintenance■ Direct reading tachometer ■ Configurable standard models

APPLICATIONS AND OPERATING RANGE The IRIS unit has exhibited sepa-ration efficiencies of 99.9 per-cent in field installations on raw gas service. It operates reliably over a wide range of flows and transient conditions. Pressure differentials will typically range from 0.5 to 5 percent of inlet pressure.

The compact size and self-powered operating character-istics of the IRIS separator enable it to be used for new and retrofit applications.

Service applications include:

■ Reciprocating inlet and discharge gas cleanup ■ Well head gas cleanup■ Gas turbine fuel gas conditioning ■ Downstream of existing scrubber / separator ■ Metering station gas cleanup■ Plant air systems

GAS FIELD INSTALLATIONA 3-inch (80 DN), 600 #CL IRIS unit (shown below) was installed on the sales gas line for a gas gathering plant. The IRIS unit received gas through a 4-inch

The IRIS separator uses inlet gas pressure directed through static nozzles to create a high-velocity swirling flow inside a rotating drum.

Liquid Collection

DiffuserSeparation Zone

Liquid Discharge

Stator Vanes

Liquid Drain

Rotor BladesRotor Drum

Diffuser

INLETEXIT

Swirl Generator

(100 mm), 600 #CL line, and delivered the clean gas to the sales gas line upstream of the sales compressors. The unit operated at approximately 300 psig (20.7 bar) inlet pressure, with a flow rate up to 5 MMSCFD (5,900 Sm3/hr). The gas was sweet and at-near ambient temperature. Liquid loading was 0.1 - 0.5 BPD and comprised 75 percent condensate and 25 percent water/glycol mix. The unit operated at a 5 - 8 psi (.34 - .55 bar) pressure drop, with greater than 99.99 percent total liquid separation efficiency. Outlet gas contained less than 0.1 gallon/MMSCF (<0.04L/thousand Sm3).

Typical operating speed for the 3-inch IRIS model is 4,000 - 12,000 RPM using advanced hybrid ball bearings.

MATERIALS OF CONSTRUCTION Three- and 6-inch IRIS units are manufactured from castings made from CA6NM ss material to provide superior corrosion resistance and long-term service in all applications. The castings meet the stringent requirements of NACE MR0175 Material Standard.

MANUFACTURING IRIS units are manufactured at Dresser-Rand’s facility in Houston, TX, USA, which also manufactures commercial Gimpel® valves. In-service units can be rebuilt at the Houston facility or at one of the

approximately 40 service centers located throughout the world. Replacement parts are stocked in Houston to support quick repair and turnaround of units removed from the field for service.

APPLICATIONS AND OPERATING RANGE

3 (80)

6 (150)

6 (150)

1 (25)

2 (50)

2 (50)

600 #CL

600 #CL

900 #CL

Horizontal

Horizontal

Horizontal

1350 (93)

1350 (93)

2025 (140)

13.4 (340)

26.3 (668)

26.3 (668)

12.8 (325)

24.5 (629)

24.5 (629)

175 (80)

1300 (590)

1300 (590)

A

A

A

Inlet Exit

Flange Size in (DN)

Liquid Drain

Flange Size in (DN)

Flange

Pressure Class Rating

Configuration

Pressure Rating

psi (bar)

“A” in

(mm)

“B” in

(mm)

Weight

lbs (kg)

Figure

MATERIALS OF CONSTRUCTION

Casings

Bearing housing, laby seal

Rotor (drum / shaft)*

Seals

Fasteners

Ball bearings (ball / race)

Fittings and tubing

*wc coating at seal areas

IRIS Components Original Design New Design

316 ss

Aluminum

316 / 304 ss

Teflon / ss

Coated cs

Ceramic / 440 ss

316 ss

CA6NM ss

CA6NM ss

CA6NM ss / CA6NM ss

Same

Same

Same

Same

Accessories

Tachometer (enclosure / probe)

Drain system (drain / fittings)

Aluminum / ss

Painted cs / ss

Same

Same, ni plated as needed

Figure A

B

A

Specifications& Accessories

SPECIFICATIONS

Inlet pressure

Operating Parameters

10 to 1350 psig (0.7 to 93 bar) 600 #CL / 2025 psig (140 bar) 900 #CL

Temperature

Inlet pipe velocity

Pressure drop

Liquid capacity

Separation efficiency

-20 °F to 200 °F (-29 °C to 93 °C)

15 to 60 ft/s (4.6 to 18.3 m/s)

0.5 to 5 percent of inlet pressure typical

0 to 30 percent by mass

99.9 percent of liquid droplets > 5 microns typical

High flow drain.

Low flow drain.

Tachometer.

ACCESSORIES ■ Tachometer (standard)■ Low-flow drain system (optional) ■ High-flow drain system (optional) ■ Remote speed signal conditioning for remote monitoring of speed in control rooms (optional)

For more information about IRIS® In-Line Rotary Separators, contact the following location:

Dresser-Rand1210 West Sam Houston Pkwy. N. Houston, Texas 77043 Tel: (Int’l +1) 713-467-2221

For a complete list of products and services, visit www.dresser-rand.com or contact the following:

CORPORATE HEADQUARTERS Dresser-Rand West8 Tower, Suite 100010205 Westheimer RoadHouston, Texas 77042Tel: (Int’l +1) 713-354-6100Fax: (Int’l +1) 713-354-6110

Dresser-Rand 112, Avenue Kleber Cedex 16 Paris 75784 France Tel: (Int’l +33) 156 26 71 71 Fax: (Int’l +33) 156 26 71 72

Email: info@dresser-rand.com

REGIONAL HEADQUARTERS

The Americas West8 Tower, Suite 1000 10205 Westheimer Road Houston, Texas 77042 Tel: (Int’l +1) 713-354-6100 Fax: (Int’l +1) 713-354-6110

EMEA (Europe, Middle East & Africa) Dresser-Rand S.A. 31 Boulevard Winston Churchill Cedex 7013 Le Havre 76080 France Tel: (Int’l +33) 2-35-25-5225 Fax: (Int’l +33) 2-35-25-5366/5367

Asia-Pacific Dresser-Rand Asia Pacific Sdn Bhd Unit 9-4, 9th Floor Bangunan Malaysian Re 17 Lorong Dungun Damansara Heights 50490 Kuala Lumpur, Malaysia Tel: (Int’l +60) 3-2093-6633 Fax: (Int’l +60) 3-2093-2622

Form 85214

FPO©2010 Dresser-Rand. DRESSER-RAND is a registered trademark of Dresser-Rand Company. Printed in U.S.A.

This brochure comprises a general overview of the Dresser-Rand products described herein. It is solely for informational purposes, does not rep-resent a warranty or guarantee of the information contained herein, and is not to be construed as an offer to sell or solicitation to buy. Contact Dresser-Rand for detailed design and engineering information suitable to your specific applications. Dresser-Rand reserves the right to modify its products and related product information at any time without prior notice.

Bringing energy and the environment into harmony.®