Virgo Coker Valves

VIRGO

Virgo... Lifeline to Your Process.

Engineered Valve Solutions for Coker Service

Common Features of Virgo EVS Valves

Scraper Seats & Purge PortsScraper seats and strategically placed purge ports can increase the life of the valve by removing media build-up from the body cavity. This prevents seizing and greatly reduces required maintenance.

Metal Body GasketUnique self-energizing pressure-energizing gasket ensures that there is no leakage during thermal transients.

Blow-Out Proof StemLarge, one-piece, machined, hardened and polished stem is a true “blow-out proof” design. There are no pins to depend on, increasing safety and reliability.

Body End Adapter

Body End Adapter

Thin Metal Ring

Low MakeupLoad

Contained Shear SealIn Makeup

PressureEnergized

Spring LoadedIn Makeup(Self Energized)

Free State Assembled

This design offers unique features such as:

No bellows, eliminating pressurization issues High strength springs keep seats in constant contact with ball fewer parts meaning greater reliability and ease of maintenance.

Switching Valve

Scraper Seat

Ball

In this design the integral seat supports the ball. The seat carries the pressure end load. The centerline of the ball and the stem are at the same location while a large spring holds the ball against the seat. This ensures the coke does not get between the ball and seat.

Side-Mount BracketSide-mounted bracket prevents “side-load” and “bolt stress loads” vis a vis a top-mount design.

Packing AreaA compact stuffing box and liveloaded springs ensure packing is continuously energized. Lantern ring allows steam purging.

Multi-Bolt GlandSuperior multi-bolt packing gland design for easy adjustment and “live loaded” spring washers.

Isolation Valve

Stem Hardened and Polished

Sufficient Gland Bolts

Live Loading

Hardened Gland

Anti ExtrusionRings

InnerStemSeal

Grafoil Packing

VIRGO ENGINEERS, INC.10225 Mula Road, Suite 130, Stafford, Texas 77477, USAPhone: +1 281 933 3100, Fax: +1 281 933 3110Email: [email protected]

There are three basic coker designs found in refineries: Fluid Coker, Flexi-Coker and Delayed Coker. The most widely used technology by far is the Delayed Coker. The purpose of the unit is to take crude oil bottoms and “crack” it into numerous viable products. Delayed Coker units consist of two vessels called coke drums that operate continuously in a timed sequence. One drum is heated, filled and goes through the cracking process cycle; while the other drum is cooled, decoked in preparation for the next cycle. In the processing drum, high temperature and pressure cause the gas and liquid vapors to rise to the top of the drum where they are piped to the FCCU for separation. The remaining heavier sludge composition turns into coke during the cracking process and adheres to the internal walls of the drum. Once the cycle is near completion the feed is re-directed to the companion drum. The just completed cycle drum goes through a cooling process with steam then water, the top and bottom sections of the drums are opened, and high pressure water cuts the coke from the walls. The cut coke chunks either fall directly into portable rail cars or is sent to a holding pit for processing at a later time. This raw coke, dependent upon its composition, is utilized by various different industries as feed stock or as by-product.

Coker Process

For more information, please contact us

FURNACE

QUENCH TOWER

CUTTING WATER

DE-COKINGDRUM

STEAM INJECTION

WATER INJECTION

BYPASS LINE

SWITCHING VALVE

WET COKE REMOVAL

ACTIVEDRUM

OVERHEAD VAPOR

FRACTIONATOR

BOTTOMS FEED

STEAM

EVS is a wholly-owned subsidiary of the Virgo Engineers Group, a globally successful valve and automation company servicing over 70 countries world-wide. Virgo Engineers is one of the fastest growing valve companies in the world. Virgo product designs are the result of decades of experience and innovation in the Oil & Gas process industry. Our designs are proven performers in the most severe environments. Virgo brand signifies quality and reliability.

EVS evolves from deep Virgo roots

Why Use Virgo EVS Metal Seated Ball Valves?The high temperatures, combined with abrasive coke slurries create challenges for most valve designs. Every component in the Virgo severe service metal seated valves is specifically designed to withstand these harsh service elements.

CUTTING WATER OVERHEAD VAPOR

FRACTIONATOR

BYPASS LINE

SWITCHING VALVE

STEAM & WATERINJECTION

WET COKE REMOVAL

SYSTEM

FURNACE

BOTTOMS FEED

ACTIVEDRUM

DE-COKINGDRUM

Technical specifications are subject to changeRange: 2010/09 R3

Disclaimer :

1. The descriptions of all the products contained in this catalogue are general in nature and the products are subject to Virgo’s Standard Warranty and other terms and conditions as contained in the applicable contract for such products.

2. We reserve the right to change or modify Product Design or construct without prior notice and without any obligation to make such modification / change on products previously or subsequently sold.

3. `Virgo’ is a trademark of Virgo Engineers Ltd.

4. All Virgo Valves are designed and manufactured using good workmanship and materials and they meet all applicable industry standards. Virgo is very anxious to avoid injuries and property damage that might result from wrong application of the product. Proper Valve selection for a given application is imperative. Examples of misapplication or misuse of a Valve include but are not limited to any service or application in which the pressure – temperature rating is exceeded or in a chemical service that is incompatible with valve materials, use of undersized actuator, use of extremely fast valve application and / or continuous valve cycling on standard valves, making modification to the product in any kind, failure to use caution in operating at high temperature, high pressure or highly hazardous services and failure to maintain valves as recommended.

Virgo Coker Valves

Documents

Transcript of Virgo Coker Valves