Alternate Energy Systems, Inc.
LPG Vaporizers - LP/Air Blenders - Gas/Gas Blenders - NatGas Backup Systems - PeakShaving Systems
Options and Accessories for LPG Systems


Alternate Energy Systems, Inc. offers a wide variety of options and accessories for virtually any LPG system, installed in commercial, industrial, or utility applications. Accessory components which are not manufactured by AES, are sourced from reputable manufacturers, and are modified and tested at AES to meet our stringent quality and performance criteria. This guarantees long lasting customer satisfaction, even for the most critical of today's LPG applications.

If you need a particular accessory, option or enhancement for your system and can not find it in this brochure, call our sales department! We may already have a product design available for immediate delivery, or we may be able to modify an existing design to meet your needs, or we could simply design a new product specifically for you. In any case, all options and accessories offered by AES are supported by our total commitment to customer satisfaction.

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Dual Pump
Typical Dual Pump System

LPG Transfer Pumps

LPG Transfer Pumps, as the  name implies, are used to transfer LPG from the storage tanks to the  vaporizer. In systems with venturi LPG/air mixing systems, they are also  responsible for maintaining the pressure needed for optimum and  efficient function of the venturi tubes.

All pumps are mounted on steel skids, and are primed  and painted. They are equipped with constant pressure regulator,  strainer, isolation valves, by-pass loops, liquid filled pressure  gauges, and any other components required for safe operation.

Smaller pumps up to 18 GPM are for single phase AC  115/230 V service. Larger pumps are for 3-phase AC 230/460 V and require  external motor starters. Pumps up to 31 GPM are direct drive pumps  (electric motor directly coupled to pump). Larger pumps are belt driven

Typical Truck Unload Station

Truck Unload and Cylinder Fill Stations

Truck Unload Stations are  used to transfer LPG from supply trucks to the storage tank(s). AES  truck unload stations are designed to be anchored in a concrete  foundation. They come complete with liquid transfer line and vapor  return line. They are equipped with control valves, excess flow valves,  vent valves, backcheck valves, and breakaway couplings. Emergency  Shutoff Valves (ESV) with pull cable and Nitrogen-operated ESV are  available as an option.

Cylinder fill stations, i.e. for filling of forklift  cylinders, can be supplied separately, or integrated with the truck  unload station.

2 inch Test Flare
2 inch Test Flare

Flare Burner Heads (Test Flares)

Test Flares are used during  system setup, and for periodical system tests and maintenance. They act  as large loads, and allow the system to be tested under real life load  conditions.

AES manufactures standard test flares with 2” gas line, or with 3” gas  line. Larger flares for bigger systems are available as customer  specials. All AES test flares are equipped with automatic ignition,  standing pilot, and steel weather cap. Electronic Flame Safeguard and  Flame Arrestors are available as options.

POM with Valve Actuator

Automatic Specific Gravity Control

Automatic specific gravity  control systems are designed to work in combination with AES’ patented  POM mixers in LPG/air mixing installations, i.e. in standby plants or  peak shaving plants. They are used in in installations where the  composition of the LPG may vary over time or from shipment to shipment.  The output signal from an in-line gravitometer, calorimeter, O2  sensor, or other device that measures the properties of the mixed gas,  is routed into a dedicated PID controller. This controller sends an  adjustment signal to an actuator, installed on top of the POM mixing  valve, which changes the rotational position of the piston until the  properties of the mixed gas are again within preset values.

Tank Farm
Typical Tank Farm with 30,000 gallon  tanks

LPG Storage Tanks

AES does not manufacture  LPG storage tanks. However, through many years of close cooperation with  major tank manufacturers, we are able to offer tanks at very competitive  pricing. Due to ever-ongoing changes in the industry, and the fact that  LPG storage tanks have typical useful lives of 40 years or more, we very  often can offer used tanks as a cost saving alternative. New LPG storage  tanks come with factory test certificates; used tanks are tested and  re-certified during installation.

As important as the tank itself are the piers, the  concrete structures the tanks are installed on. AES recommends and  installs pre-cast concrete piers from reputable manufacturers.

Tank Trim
Photo of lower portion of
typical tank trim.

Tank Trim and ESVs

New or used, LPG storage  tanks must be fitted with “Trim”. These are valves and fittings, safety  relief valves, excess flow valves, liquid withdrawal ports, tank level  indicators and transmitters, pressure gauges, thermometers, etc. to meet  the safety requirements of NFPA, and the information and convenience  requirements of the operators. Emergency Shutoff Valves (ESVs) are  installed between truck unload stations and the storage tanks, and in  the liquid withdrawal line(s) of the tank(s). They are activated by  pull-cables, or through a Nitrogen-operated pneumatic system.

The actual configuration of tank trim and ESVs depends  on the particular requirements of the installation. Contact AES for more  information.

Typical Strainers and Check Valves
Typical Strainers and Check Valves

Strainers and Filters

Strainers are installed in  the liquid LPG supply line to the vaporizer, and are designed to remove  solid contamination in the LPG, i.e. sand, rust, or other debris. AES  carries strainers for all common pipe sizes from 3/4 inch to 6 inch.  Larger strainers are available as a customer special.

In addition to solid contaminants, Coalescent Filters  are designed to remove moisture and unwanted by-products from the  refining process, so-called “heavy ends”, from the LPG. AES manufactures  coalescent filters for the liquid phase of the LPG (PLF series) and  models for the vapor phase (PVF series). All coalescent filters come  complete with 300# ANSI flange connections, and manual drain valve for  accumulation removal.

Tank Trim Different Style Ball Valves  and Globe Valve
Different Style Ball Valves
and Globe Valve

Ball Valves and Globe Valves

Valves are installed in  various places on a LPG vaporizer or LPG/air mixing system. Depending on  the job the valve is designed to do, less expensive ball valves or more  expensive, heavier globe valves are used. The main difference between  both valve types is in the design of the sealing mechanism: Ball valves  are very simple in design and rely on the smooth finish of the center  ball after a 90 degree turn to seal. Globe valves are more complex, and  create a positive seal by blocking the flow of the fluid with a solid  “lid”. At similar valve size, ball valves offers greater flow rates,  while globe valves offer the advantage of creating a positive seal. At  similar flow rates, globe valves are considerably larger and heavier.

All standard globe or ball valves used by AES are UL  listed for LPG service.

Various pressure regulators
Various pressure regulators

Service Regulators

After vaporization, LPG  vapor exits the vaporizer at the pressure of the liquid supply line.  This pressure, either tank pressure or discharge pressure from a pump,  may be too high for existing distribution pipelines and must be reduced  to the system service pressure (thus, the name Service Regulator).

Size and type of the service regulator is a function of  pressure, flow rate, ambient temperature, and line size. AES offers  service regulators from several manufacturers, i.e. Fisher and REGO, in  a wide range of sizes, matched to the vaporizer or vaporizer/mixer size.

Schematics of Xomos Valves
Schematics of Xomos Valves


The main application for  3-way valves is with LPG/air mixing systems, used as standby systems.  They are installed in the main natural gas supply line, and allow the  LPG/air mixing system to seamlessly take over the gas supply without  interrupting the process. This is achieved through the use of a rotating  piston, which gradually opens the input side for the LPG/air mixture,  while simultaneously closing off the natural gas side.

For fully automated systems, 3-way valves can be  equipped with electric or pneumatic actuators, allowing the operator to  remotely switch from natural gas supply to the standby system.

6-inch Flow Meter
6-inch Flow Meter

Flow Meters and  Flow Computers

In many installations it is important to know the flow  rate of the gas produced by a vaporizer, or vaporizer/mixer system. AES  offers mechanical, electro/mechanical, and electronic units.

In many installations it is important to know the flow  rate of the gas produced by a vaporizer, or vaporizer/mixer system. AES  offers mechanical, electro/mechanical, and electronic units.

Flow meters with electronic output signals can be  connected to Flow Computers, where actual flow is corrected for  temperature and pressure. The output signal of the meter or the computer  can also be used to control Flow Control Valves (see below).

Flow Control Valve  with electric Actuator
Flow Control Valve
with electric Actuator

Flow Control Valves

Flow Control Valves are used to limit the flow through  a pipeline. Standard applications include the protection of LPG/Air  systems from overload conditions (which could potentially shut the  system down), and natural gas “Peak Shaving”. In Peak Shaving  applications the amount of gas that is drawn from a natural gas line is  controlled to stay within contractual agreements. If the usage would be  allowed to exceed contract amounts, the user (i.e. gas utility) will be  assessed hefty penalties by the pipeline operator.

AES carries flow control valves for various sizes and  pressures. They can be manually adjustable, fixed pre-set, or fully  automatic.

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