Last updateMon, 27 Aug 2018 3am

The Insiders’ Guide to Modular Gas Valves

Fuel gas shutoff valves represent the main line of defense in combustion devices such as burners and boilers. They’re key to the safe operation of equipment for nonresidential comfort heating, commercial and industrial heating, and power and steam generation applications worldwide. While conventional modular gas valve designs are popular and effective, the latest generation of valves has even more dramatic improvements. Recent technological advancements — in models such as new modular gas valves from ASCO — offer breakthrough features and benefits. These include higher flows, more compact footprints, and greater modularity and flexibility to enable downsizing of fuel train components, as well as broader temperature ranges, higher close-off pressures, more immediate availability, and reduced costs of ownership.

Please click 'The Insiders’ Guide to Modular Gas Valves' todownload the White Paper by ASCO Valves.

Advantages of Coriolis Meters in the Short-Term Trade of Liquefied Natural Gas

The short-term trade of liquefied natural gas (LNG) is becoming increasingly common. At last estimate,12% of the LNG market was in short-term (or spot) contracts. The figure is expected to rise to 33% by the year 2011. The increase in short-term trading means that both delivery and loading systems are going to require each party to have a metering system—an arrangement similar to what exists in the oil tanker custody transfer industry.

Please click 'Advantages of Coriolis Meters in the Short-Term Trade of Liquefied Natural Gas' to download the White paper by Emerson Process Management

Fundamentals of Combustible Gas Detection

To develop an appropriate strategy for the implementation of a combustible gas detection system, a basic understanding of the properties of combustible materials

is necessary. In our discussion we will identify the general properties necessary for determining a material’s hazardous potential, then turn our attention to specific

information on combustible gases and liquids.

Please click 'Fundamentals of Combustible Gas Detection' to download the Handbook by General Monitors

Part 2: Capillary Thermal Flow Meters vs. Differential Pressure Devices

Sierra Blog by S. Rouse: In my last post on capillary thermal flow meters, I talked about volumetric flow and how it must be temperature and pressure corrected to obtain mass flow. Wouldn't the world be a simpler place if we could simply measure mass flow directly? In fact, we do! Capillary thermal is likely the most ideal technology for accurately and economically measuring and controlling gas mass flow rate of low flows (under 1000 slpm) and is widely used for this very reason.

During operation, process gas enters the instrument’s flow body and it divides into two flow paths. The vast majority of the gas flow passes through a Laminar Flow Element (LFE) bypass. A very small portion of the total flow is diverted through a small heated “capillary” sensor tube with an ID between .007 to .028 inches. As the gas flows through this very small, evenly heated tube, the molecules of the gas carry some heat from the upstream section to the downstream section. This creates a temperature differential between the two sections which yields the output signal. This output signal is directly proportional to the number of molecules taking the heat away and is thus a direct measurement of mass flow. No pressure (P) or temperature (T) compensation required.