Gas Gathering Systems and Oil Production Facilities by EN-FAB Inc
Gas Gathering Systems and Oil Production Facilities by EN-FAB Inc
EN-FAB Inc delivers gas gathering systems and oil production facilities with expert design, fabrication, and installation to improve efficiency, reliability, and field performance.
Portable Steam System (DAN-STM®)
EN-FAB, Inc's DAN‐STM® steam quality measurement system consists of an orifice meter and a choke arranged in series with the choke placed downstream of the orifice meter.
A conventional straight “bean” type choke requires a minimum of 50% pressure reduction to achieve critical flow. The pressure drop requirement is not always feasible, particularly in higher pressure systems. To minimize this difficulty, EN‐FAB Inc. employs a Pressure Recovery Venturi (PRV) nozzle within a conventional type choke body bean. The PRV design reduces the minimum pressure drop requirement to 20% of the inlet pressure.
The flow computer uses the orifice equation and Napier equation to solve for these values. By employing simultaneous equations solution method, first one parameter is solved for; i.e. mass rate, followed by using the value in either equation to obtain the other parameter; i.e., steam quality. The resulting values of these two parameters will satisfy both equations. Graphically, this is where the lines for each equation intersect. However, the orifice equation and the Napier equation cannot be used in their pure mathematical form, theoretically determined empirical constants are incorporated in the calculations that give accuracy to the results.
Design And Operating Data
- Design Input / Basis of Design
- (Design Parameters): Fluid : Saturated Steam
- Design Pressure : 18,500 kPag (2,683 PSIG)
- Design Temperature : 360 Deg. C (680 Deg. F)
- Design Steam Flow Rate : 12,700 Kg/Hr (28,000 LB/Hr) MDMT : ‐29 Deg. C (‐20 Deg. F)
- Design Steam Quality : 30 to 100%
- Operating Limit Details (Operation Condition)
- Operating Inlet Pressure : 10,000 ‐ 11,000 kPag (1,450 ‐ 1,595 PSIG)
- Operating Outlet Pressure : 8,000 ‐ 8,800 kPag (1,160 ‐ 1,276 PSIG)
- Operating Temperature : 312 Deg. C (593 Deg. F)
- Nom. Steam Flow (Case 1): 8,590 – 11,399 Kg/Hr (18,939 – 25,130 LB/Hr) [0.672” ID Choke]
- Nom. Steam Flow (Case 2): 6,709 – 8,902 Kg/Hr (14,791 – 19,626 LB/Hr) [0.593” ID Choke]
Optional Features
- Trailer Mounted Dan-STM with custom spool attachment configurations
- Skid Mounted Dan-STM
- Solar Powered
- HMI (Human Machine Interface)
- 4-20 mA outputs for data and process parameters
- Daily and Hourly reports
- Trend Data
- SCADA
- In-system integration (steam process lines that require steam quality measurement)
Two stage Operation
A possible means of reducing both capital and operating costs is the use of a two-stage vacuum deaerator (I.E. two vacuum deaerator operating in series). Each vacuum deaerator has its own evacuating system.
Forced Draft Degasifier In Series with Vacuum Deaerator Operation
When CO2, VOCc and other removal is required, a forced draft degasifier is used prior to a vacuum deaerator. Liquid is sprayed on the packing at the top of the column and, as it travels down through the packing, a film forms on the surface of the packing, allowing the release of entrained gases into the fan assisted counter-current air flow that passes up through the column. A mist eliminator/demister removes droplets from the air as it exits via the vent at the top of the column.
Areas of Application
- Removal of carbon-dioxide to increase the PH of the water and reduce anion loading of the strong base anion exchanger.
- Removal of Oxygen to reduce corrosion or oxidation of iron and steel.
EN-FAB engineers fully skidded, packaged vacuum deaerators and forced draft degasifier equipment for Heat Recovery Steam Generators (HRSG) and other applications.
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