Wednesday, November 14, 2018

Replace Old Boiler Damper Drives with Better Performing, Drop-in Replacements

Type K Damper Drive
Industrial dampers and louvers are used to precisely control combustion air and flue gases in power plants, refineries, powerhouse boilers, furnaces and process heaters. A damper drive is a specialized pneumatic or electric actuator that positions air and flue gas dampers on combustion based systems in industrial environments.

Damper drives can provide linear or rotary motion to meet certain application requirements. The damper positioning is a process control function that is used to increase efficiency, reduce maintenance, control harmful emissions, and lower fuel consumption.

Damper drives have been installed in commercial and industrial application for many decades, and the replacement of older and obsolete models is an ongoing concern for operators. Retro-fitting an existing damper drive application can be mechanically challenging and labor-intensive. "Drop-in" refers to fitting in the existing drive's footprint, bolting pattern, and overall size envelope, so any replacement claiming "drop-in" compatibility is favorable in terms of time and materials.

Rotork, a globally recognized manufacturer of valve and damper actuators, has developed a product series within their damper drive line that specifically addresses the drop-in replacement of legacy damper drives.

Rotork's PM and DM Series drives, a portion of the company's Type K Damper Drive line, provide rotary operation in the 30 to 100 degree range and are available as pedestal mount or direct mount versions. As a subset of this broad offering, the company has crafted the FasTrak Series, which are preconfigured as ready-made units to replace common, older legacy damper drives. Twelve models cover the most commonly occurring pneumatic or electric damper drive replacements. The manufacturer states that the FasTrak drives will:
  • Bolt to the floor where the old drive was mounted
  • The existing link rod and clevis will attach to the FasTraK drive lever
  • Simply verify envelope dimensions to assure that there are no external obstructions
A product catalog describing the full line of Type K drive can be found here. For more information, contact CTi Controltech at 925-208-425 or visit their website at

Tuesday, October 30, 2018

The Flowserve Logix 3800 Digital Valve Positioner

The Logix 3800 positioner features powerful diagnostics that identify field problems and expedite corrective actions to ensure reduced return-to-operation times.

Compatible with linear and rotary valves and actuators, the robust design of the Logix 3800 delivers high reliability in tough environments, reduces inventory costs and contributes to a lower total cost of ownership, and installs with an innovative, one-button quick calibration feature.

Partial List of Features:
  • Rugged, certified SIL 3 capable modular design delivers maximum reliability in the toughest environments. 
  • Installation and operation ease from innovative quick calibration feature to simplify commissioning. 
  • Broad application versatility with industry-leading communication technologies, including analog, HART, Foundation Fieldbus, 4-20 or discrete I/O signals.
  • Intrinsically safe, non-incendive and explosion-proof design from -52°C to 185°C (-62°F to 365°F) ensures safe, reliable operation in hazardous conditions for increased plant and personnel safety.
  • Compatible with a variety of valve and actuation configurations including: rotary or linear valves; double- or single-acting; air- to-open or air-to-close.

Monday, October 22, 2018

Control Valves by CTi Controltech

CTi Controltech handles a complete portfolio of control valves. From linear control valves to rotary control valves, CTi can handle the most severe services, including cryogenic, superheated steam, volatile, erosive, and corrosive fluids, high pressure drops, vibration, cavitation, flashing, and high noise levels. CTi's applications engineers can select and size the best choice for your application, and counsel you on the best practices for safety, accuracy, and long operating life.


Sunday, September 30, 2018

Steam Metering and Steam Flow Measurement

Steam Flow Measurement
For steam, energy is primarily contained in the latent heat and, to a lesser extent, the sensible heat of the fluid. The latent heat energy is released as the steam condenses to water. Additional sensible heat energy may be released if the condensate is further lowered in temperature. In steam metering, the energy content of the steam is a function of the steam mass, temperature and pressure. Even after the steam releases its latent energy, the hot condensate still retains considerable heat energy, which may or may not be recovered (and used) in a constructive manner. The energy manager should become familiar with the entire steam cycle, including both the steam supply and the condensate return.

When compared to other liquid flow metering, the metering of steam flow presents one of the most challenging metering scenarios. Most steam meters measure a velocity or volumetric flow of the steam and, unless this is done carefully, the physical properties of steam will impair the ability to measure and define a mass flow rate accurately.

Steam is a compressible fluid; therefore, a reduction in pressure results in a reduction in density. Temperature and pressure in steam lines are dynamic. Changes in the system’s dynamics, control system operation and instrument calibration can result in considerable differences between actual pressure/temperature and a meter’s design parameters. Accurate steam flow measurement generally requires the measurement of the fluid’s temperature, pressure, and flow. This information is transmitted to an electronic device or flow computer (either internal or external to the flow meter electronics) and the flow rate is corrected (or compensated) based on actual fluid conditions.

The temperatures associated with steam flow measurement are often quite high. These temperatures can affect the accuracy and longevity of metering electronics. Some metering technologies use close-tolerance moving parts that can be affected by moisture or impurities in the steam. Improperly designed or installed components can result in steam system leakage and impact plant safety. The erosive nature of poor-quality steam can damage steam flow sensing elements and lead to inaccuracies and/or device failure.

The challenges of metering steam can be simplified measuring the condensed steam, or condensate. The metering of condensate (i.e., high-temperature hot water) is an accepted practice, often less expensive and more reliable than steam metering. Depending on the application, inherent inaccuracies in condensate metering stem from unaccounted for system steam losses. These losses are often difficult to find and quantify and thus affect condensate measurement accuracy.

Volumetric metering approaches used in steam metering can be broken down into two operating designs: (1) differential pressure and (2) velocity metering technologies. For steam three differential pressure meters are highlighted: orifice flow meter, annubar flow meter, and spring-loaded variable area flow meter. All differential pressure meters rely on the velocity-pressure relationship of flowing fluids for operation.

Differential Pressure – Orifice Flow Meter. Historically, the orifice flow meter is one of the most commonly used meters to measure steam flow. The orifice flow meter for steam functions identically to that for natural gas flow (see previous section). For steam metering, orifice flow meters are commonly used to monitor boiler steam production, amounts of steam delivered to a process or tenant, or in mass balance activities for efficiency calculation or trending.

Differential Pressure – Annubar Flow Meter. The annubar flow meter functions the same way for steam flow as it does for natural gas flow.

Differential Pressure – Spring-Loaded Variable Area Flow Meter. The spring-loaded variable area flow meter is a variation of the rotameter. There are alternative configurations but in general, the flow acts against a spring-mounted float or plug. The float can be shaped to give a linear relationship between differential pressure and flow rate. Another variation of the spring-loaded variable area flow meter is the direct in-line variable area flow meter, which uses a strain gage sensor on the spring rather than using a differential pressure sensor.

The two main type of velocity meters for steam flow, turbine and vortex shedding, both sense some flow characteristic directly proportional to the fluid’s velocity.

Velocity – Turbine Flow Meter. The turbine flow meter functions the same way for steam flow as it does for natural gas flow.
Velocity – Vortex-Shedding Flow Meter. The vortex-shedding flow meter functions the same way for steam flow as it does for natural gas flow.

Friday, September 21, 2018

Industrial In-line, Spring-loaded Check Valves

Check-All Check Valve
Check-All Check Valve
Check-All Valve manufactures in-line spring-loaded poppet-type check valves, vacuum breakers, and low pressure relief devices. All valves are available with metal to metal or soft seats. Sizes range from 1/8” NPT to 20 inch flanged connections. Pressure ratings are available from full vacuum to 10,000 psi. Special materials available are Titanium, Alloy C-276, alloy 20 and many others. Fluoropolymer (FEP) encapsulated springs are available for special corrosion applications.

Certifications & Compliances
  • ISO 9001
  • 3-A Sanitary Standards
  • B16.34 Certification
  • Canadian Registration Number
  • CE (PED 2014/68/EU) Conformance
  • NACE Standards
For more information, download the Check-All Valve Product Catalog from this link, or view the embedded document below.

CTi Controltech

Friday, August 31, 2018

Rupture Discs for Sanitary and Hygienic Applications in Pharmaceutical, Biotech, Food, and Beverage Facilities

SANITRX HPXContinental Disc Corporation's SANITRX HPX & SANITRX HPX II Rupture Discs are semicircular scored reverse acting rupture discs designed specifically for the pharmaceutical, biotech, food and beverage industries. These rupture discs are available to fit between industry standard sanitary ferrules, NA-CONNECT® flanges or SANITRX fittings.

The SANITRX HPX & SANITRX HPX II Rupture Discs can be used in a wide range of sanitary and hygienic applications throughout pharmaceutical, biotech, food, and beverage facilities. The following list is only a small sample of the many ways in which this outstanding rupture disc can be used:
  • Autoclaves
  • Bioreactors
  • Clean Steam Piping 
  • Process Vessels 
  • Heat Exchangers 
  • Filters
  • Storage & Transport Vessels
  • Mixing, Drying, Granulating Equipment 
  • Wfi Vessels & Piping
  • Lyophilizers (Freeze Drying)
  • Cip & Sip Skids and Piping
  • Fermenters
To learn more about sanitary and hygienic rupture discs, review the embedded document below or download a PDF of the Continental Disc Corporation Sanitrx HPX & Sanitrx HPX II Rupture Disc brochure here.

Wednesday, August 15, 2018

Detonation Flame Arresters

Detonation Flame Arrester
Detonation Flame Arrester (Groth Corporation)
Detonation flame arresters are designed to prevent flame propagation in gas piping systems which contain flammable gas/vapor mixtures. It operates by removing heat from the flame as it attempts to travel through narrow passages with heat-conductive walls. The arrester will stop a high velocity flame by absorbing heat away from the flame head, which lowers the burning gas/air mixture below its auto-ignition temperature, and creating an atmosphere where the flame cannot be sustained. The arrester must prevent flame passage under certain specified conditions while permitting free flow of gas/vapor through the system. The channels or passages in the flame arrester are designed to very efficiently conduct heat outward, but still allow the gasses to flow. Thus it protects vulnerable equipment or components of the system from damage due to explosive pressures caused by gas/vapor ignition in another part of the system. The detonation flame arrester must be used under only those operating conditions for which it was designed and tested.

The flame arresters consist of two main components, the arrester bases and the flame element housing assembly. The bases serve as the connecting interface to the piping system. The housing retains and supports the flame element. Both components are essential in stopping the passage of the flame.

The flame element is comprised of small parallel passageways aligned so that an approaching flame front is slowed down and then quenched before it can propagate to the protected side of the device.

The bases must also withstand the detonation pressures while conveying the burning vapors and flame front to the element. Depending on the design of the system in which it is used, the arrester bases can include optional ports for thermocouples or pressure monitoring devices. These devices can activate warning or shutdown systems if abnormal conditions are detected. Both bases may be equipped with large diameter inspection/clean-out ports for in-line maintenance of the element, or element removal may be required for inspection/maintenance.

Flame arresters are used in many industries including chemical, refining, petrochemical, pulp and paper, oil exploration and production, pharmaceutical, sewage treatment, landfills, power generation, and bulk liquids transportation.

Please always consult with a properly qualified applications specialist prior to specifying, purchasing, or applying flame arresting devices.