POM LPG-Vapor / Air Mixers

All POM Systems are designed to be used with an existing LPG vapor source, such as a vaporizer, or as the replacement for less efficient or less reliable LPG-vapor/air mixing systems. They can also be used as NatGas/Air or NatGas/Nitrogen blenders (i.e. for NatGas stabilization) and come assembled on a steel skid, complete with electric/electronic controls, and all other equipment necessary for safe operation.
 
A PLC (Siemens S7-1200 or Allen-Bradley MicroLogix-1100) is used to monitor and control all system functions. The PLC also communicates with an Electronic Operator Interface (EOI)  with color LCD display and touch screen, displaying all system pressures in real time. And any trouble conditions that may occur are displayed in plain English, and are recorded in the Alarm History. Graphic trend recording is standard.
 
The PLC may also be used to “interlock” the POM system with an external vaporizer. The standard mixer control panel is designed to be installed in a non‑hazardous location.  Ethernet Interface is standard.
 
Vapor inlet, air inlet, strainers, check valves, and regulators are “flanged”. Pneumatically operated ball valves in vapor inlet and compressed air inlet are standard. The inlet valves are “fail-safe-closed” and will close automatically in the event of a power failure, or when a high-pressure condition exists.
 
Installations where the mixer system is separated from the water bath vaporizer (or other gas-fired vaporizer); installations with electric vaporizers; and some local codes; require the option "Explosion Proof Control Components", which also includes explosion proof transmitters and solenoid valves.
 
To find the right POM for your application, select the required nominal system capacity from the first column of the chart. Move to the right until you are below the system design pressure (delivered mixed gas pressure) The top row of the cell indicates the POM model number. The bottom row of the cell indicates the price for this configuration.
 
Nominal Capacity in BTU per hour (top row) and NatGas Equivalent** (m³/h; bottom row) is approximate and is given for Propane/Air mixtures with 1450/cuft at delivered mixed gas pressures of 10 psig to 100 psig. Capacity for other LPG/Air mixtures and/or pressures may vary. Nominal Capacity is based on vapor and compressed air inlet pressures of 100-125 psig, and a pressure drop of 10% across the mixing valve at maximum flow.  The minimum vapor and air supply pressures are “Sendout Pressure + 15 psi (1bar)”. 
 
Other Blender configurations (for lower or higher delivery pressures, higher flow rates, other blending gasses, different materials, …) are available. Please contact the factory or your area distributor for details.
 

** NatGas Equivalent: In most cases, POM blenders will be used to provide backup for a NatGas supply. Use the maximum expected NatGas flow per hour to select the correct POM model.     

10 psi
0.7 bar

20 psi
1.4 bar

30 psi
2.1 bar

40 psi
2.8 bar

50 psi
3.5 bar

60 psi
4.2 bar

70 psi
4.9 bar

80 psi
5.6 bar

90 psi
6.3 bar

100 psi
7 bar

20 MM
560 m³/h

POM-30
$66,920

40 MM
1130 m³/h

POM-40
$74,756

60 MM
1700 m³/h

80 MM
2260 m³/h

100 MM
2800 m³/h

POM-60
$91,969

120 MM
3400 m³/h

140 MM
4000 m³/h

POM-30
$74,756

POM-30
$74,756

POM-30
$74,756

POM-30
$74,756

POM-30
$74,756

160 MM
4530 m³/h

POM-30
$77,514

POM-30
$77,514

POM-30
$77,514

POM-30
$77,514

180 MM
5100 m³/h

POM-30
$77,514

POM-30
$77,514

POM-30
$77,514

POM-30
$77,514

200 MM
5660 m³/h

POM-30
$77,514

POM-30
$77,514

POM-30
$77,514

POM-30
$77,514

220 MM
6230 m³/h

POM-60
$105,846

POM-60
$105,846

240 MM
6800 m³/h

260 MM
7360 m³/h

280 MM
7930 m³/h

300 MM
8500 m³/h

320 MM
9060 m³/h

340 MM
9630 m³/h

360 MM
10200 m³/h

380 MM
10760 m³/h

400 MM
11330 m³/h

Options, Accessories
   
The following is an abbreviated list of available options and accessories for POM Blenders. Many more options and non-standard configurations are available to meet the requirements of (almost) any application. Unless stated otherwise, all options are available for all POM models.
 
If you need a blender that cannot be configured using the options listed below, please contact your area distributor or the factory.
    

Options, Accessories, Spare Parts

Description

Price in US-$

GB-3

Option: GraviBlend™-3, Gravitometer for LPG/Air mixtures, Standard Configuration for non-classified areas, Range 0.2 … 2.2 (relative density). High-speed, high-accuracy, on-line gravitometer; measures and indicates specific gravity of mixed gas.
 
Powder coated steel NEMA 4 wall-mount enclosure; integrated filter element in sample gas line; integrated consumption jet in sample gas line; integrated sample gas bypass with precision instrument valve; full-graphic 6-inch color LCD display with touch screen operator interface (see Note 1); direct display of Specific Gravity, Calorific Value, and Wobbe Index number; electronic signal processor (see Note 1) with alarm contacts; internally powered analog output signal 4...20 mA (source; scaled to 0.4 … 2.0 SG) for external recording instruments; AC 110 V 60 Hz; graphic trend recording function for Specific Gravity for the previous 27 hours; semi‑automatic calibration feature.

 $  16,934.00
 

GB-3E

Option: GraviBlend™-3, Gravitometer for LPG/Air mixtures, Explosion-Proof Configuration for classified areas, Range 0.2 … 2.2 (relative density). High-speed, high-accuracy, on-line gravitometer; measures and indicates specific gravity of mixed gas. Separate enclosures for electronic components, gas distribution elements, and gravity sensor.

Electronics Enclosure (see Note 1): powder coated steel NEMA 4 wall-mount enclosure; full‑graphic 6-inch color LCD display with touch screen operator interface; direct display of Specific Gravity, Calorific Value, and Wobbe Index number; electronic signal processor (see Note 1) with alarm contacts; internally powered analog output signal 4...20 mA (source; scaled to 0.4 … 2.0 SG) for external recording instruments; AC 110 V 60 Hz; graphic trend recording function for Specific Gravity for the previous 27 hours; semi‑automatic calibration feature.

Gas Distribution Enclosure: powder coated steel NEMA 4 wall-mount enclosure; integrated filter element in sample gas line; integrated consumption jet in sample gas line; integrated sample gas bypass with precision instrument valve; 1/8” bulkhead fittings for connection to Sensor Enclosure.

Sensor Enclosure: explosion-proof aluminum junction box with gravity sensor and signal conditioner, wall-mount (horizontally).

$  21,914.00

POMOPTACC

Option: AccuBlend™ System, Automatic Gas Properties Control. Electric actuator to adjust the angular position of the piston in the POM, and thereby correcting the calorific value of the mixed gas. Actuator is installed on top of the POM valve. Price includes controller with PID characteristics (integrated in electronic signal processor of GraviBlend™-3/3E; see Note 1), which receives a linear analog signal (4-20 mA or 0-5V) from the Gravitometer and sends a control signal to the actuator (requires “Option: Gravitometer”).

$  8,855.00

POMOPTETH

Siemens S7-1200 with 10-inch (640x480) Siemens Touch Panel with built-in Web Server for Remote Access and Control.
System can be accessed with a standard web browser. No special software required.

 $  3,286.00

POMOPTFLOW

Flow Transmitter in sendout line; real-time SNG flow display on EOI. If the POM is equipped with a Gravitometer, LPG vapor flow, compressed air flow, and liquid LPG flow are also displayed. Dual Flow Totalizer (with individual reset) is standard for all displayed flow values.

 $  7,909.00

POMOPTTEM

Option: Three Temperature Transmitters; installed in vapor supply, air supply line, and mixed gas line. Each transmits a 4-20 mA signal to the display unit in the system control panel. Temperature display in engineering units, i.e. °F or °C. Includes Hi/Lo setpoints for each transmitter; includes expansion analog input module for PLC;.

 $  3,862.00

POMOPTMOD

Option: Module Unit. Installation of POM on same skid with water bath vaporizer.
POM orientation is “vertical”.

 $  4,903.00

POMOPTEX 1

Option: Ex-proof control components; required for installations where the POM is more than 15 ft. away from a gas-fired vaporizer (U.S. rules), or where required by local law. Includes explosion-proof pressure transmitters in vapor supply line, air supply line, and mixed gas line. Includes explosion-proof control panel enclosure, mounted directly at the blender skid.

 $  10,853.00  

Option: Ex-proof control components; required for installations where the POM is more than 15 ft. away from a gas-fired vaporizer (U.S. rules), or where required by local law. Includes explosion-proof pressure transmitters in vapor supply line, air supply line, and mixed gas line. Includes powder coated NEMA 4 wall-mount enclosure for system control panel, to be installed in non-classified area. Interconnecting cable between explosion proof junction box at the blender skid and control panel is to be supplied and installed at job site. Maximum distance between mixer and control panel approximately 2000 ft. (600 m). Includes local Start/Stop station, installed on blender skid.

Option: CE Approval; available for all POM models; compliant with PED, ATEX, and all other applicable European Directives.

Option: Electronic PeakShaving Controller. Includes Allen-Bradley PLC upgrades (SLC-5/05 with Ethernet Interface; 12-inch color LCD display with Touch Screen Operator Interface; Analog Output for Flow Control Valve). Includes user-selectable PeakShaving modes (i.e. “Inject fixed SNG Volume”; “Limit NG Flow”; “Maintain NG/SNG Ratio”; …). Includes electronically controlled Flow Control Valve in Mixed Gas Sendout Line (pneumatically actuated); Thermal Mass Flow Transmitter in Mixed Gas Sendout Line; Analog Inputs for Grid Flow (or NatGas Flow), and Grid Pressure; block valve in Mixed Gas Sendout Line (pneumatically actuated).

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Factory