Showing posts with label Montana. Show all posts
Showing posts with label Montana. Show all posts

Friday, December 7, 2018

Mitigating Legionnaires Risk with Anti-Microbial Cooling Towers

Anti-Microbial Cooling Towers
Anti-Microbial Cooling Tower
(Delta Cooling Towers, Inc.)
We've all read about deadly outbreaks of Legionnaires Disease cropping up in cities across the United States. Hundreds of people have been severely sickened and dozens killed by deadly bacteria that proliferates in water systems like the cooling towers used in conjunction with large HVAC systems.

Causes:
  • Poor water flow and areas where water is stagnant, common to cooling tower designs with a large flat bottom basin, which will have stagnant water in the corners.
  • pH between 5.0 and 8.5, water temperatures between 68°F and 122°
  • Sediment that promote growth of commensal microflora
  • Microorganisms including algae, flavobacteria, and Pseudomonas, which supply essential nutrients for Legionella growth or harbor the organism
Prevention:
  • Chemical Water Treatment: Oxidizing Biocides are recommended as the best mode of control. Warning: this type of biocide can be aggressive towards metal surfaces; specifically metal cooling towers.
  • System Design & Engineering: No stagnant water, sloped basin, and/or basin sweeper system.
  • Maintenance – Competent consistent water treatment and monitoring most important.
  • According to the Center for Disease Control and Prevention, about 5,000 cases of Legionnaire’s disease are now reported each year in the United States.
Cooling towers have a long history of effectively expelling heat from the water used in many commercial and industrial applications. However, a recent study from the Center for Disease Control and Prevention (CDC) found that an overwhelming majority of the cooling towers they tested contained Legionella DNA. Legionella bacteria can flourish in cooling towers and spread to humans when expelled water vapor or mist containing the bacteria is inhaled.

Research in Legionella prevention led to conclusions that cooling towers with rounded basins and compounded with an antimicrobial resin significantly mitigated risk of harmful bacteria.  Rounded towers improve circulation which inhibits growth, and the anti-microbial chemicals embedded into the tower’s HDPE material also helps to prevent the growth.

Resulting from the research, the Anti-Microbial Cooling Tower, was developed by Delta Cooling Towers, Inc. and is now available to greatly reduce the growth of Legionnaires bacteria,  By incorporating an anti-microbial HDPE resin in the cooling tower shell, tower fill and drift eliminator, tests have confirmed efficacy against the growth and spread of Legionella.

For more information on Anti-Microbial Cooling Towers, visit this link.

To learn more about Anti-Microbial Cooling Towers right now, call Mountain States Engineering and Controls at 303-232-4100.


Friday, November 30, 2018

LevelWAV Radar Level Transmitter

LevelWAV microwave level transmitterKING-GAGE LevelWAV microwave level transmitter provides continuous measurement of liquids in storage or processing vessels. Measurement is independent of dielectric constant, temperature, pressure and density variations. It is suitable to a broad range of level measurement and control applications including process conditions exhibiting visible vapors, foam, high temperature and/ or pressure. Level measurement is possible for highly corrosive materials (caustics, acids, solvents) and slurries.

For more information, contact Mountain States Engineering and Controls by calling 303-232-4100 or visit their web site at https://mnteng.com.

Download the LevelWAV brochure here.


Friday, November 16, 2018

What is a Triple Offset Valve (TOV)?

Triple Offset Valve
Click for larger view.
As the name implies, there are three separate offsets designed into the triple offset valve. Two of the offsets apply to the location of the shaft with respect to the center line of the bore and the center line of the disc/seat sealing surfaces.

The third offset in the design is the axis of the seat cone angle that is inclined from the center line of the valve bore. This eliminates rubbing of the seat/seal contact surfaces during operation and preserves sealing integrity over the cycle life of the valve.

The contact is made in only the final point of closure, acting as a mechanical travel stop which prohibits over-travel of the disc.

Applications and Method of Control

A triple eccentric or triple offset butterfly valve should be used when the application requires bubble tight shut-off, but does not allow the use of a rubber-lined butterfly valve due to low/high temperatures and high pressure. The triple offset design can be used for on/off services, throttling services and modulating services.

On/Off Service
Like the name suggests, on/off valves are designed to shutoff and to open fully but lack the ability to to regulate effectively through the range of travel.

Throttling Service
Throttling service (sometimes referred to as inching) is in general flow control through the system where the valve is set and held in an intermediate position.

Modulating Service
Modulating service (known also as regulating service) is used to drive the valve frequently to any position between fully open and fully closed to control the flow. It uses feedback from the field, and valve disc position is adjusted almost continuously.

Quarter turn valves are usually limited to a throttling range of ~25° to ~75° open (25% to 85%). In case of throttling the manufacturer should be consulted in order to predict whether the control valve was installed accurately.

For more information, contact Mountain States Engineering and Controls. Visit their web site at https://mnteng.com or call 303-232-4100

Monday, October 29, 2018

Level Controls Used on Grain Silos and Hoppers

Here is a short video displaying NIVELCO level instruments being used on grain silos and hoppers.

NIVELCO manufactures level measurement and control transmitters using microwave, guided wave radar, ultrasonic, capacitive, and magnetostrictive technologies as well as level switches utilizing float, conductive, magnetic, and vibrating technologies.


For more information, contact:
Mountain States Engineering and Controls
1520 Iris Street
Lakewood, CO 80215
303-232-4100 Phone
303-232-4900 Fax
www.mnteng.com

Monday, October 22, 2018

Emerson/Kunkle Pressure Relief Valves: Operating and Safety Instructions

Kunkle Pressure Relief Valve
Emerson/Kunkle Pressure Relief Valve
Before installation these instructions must be fully read and understood.

PRE-INSTALLATION HANDLING

This pressure relief valve is designed to protect equipment from overpressure. The valve should be handled with care, not subjected to heavy shock loads, and protected to prevent dirt from getting inside. It should be installed correctly. Failure to do so could result in property damage or serious injury to personnel. When hoisting the valve into position for installation, care should be exercised so that lifting straps do not contact the valve lift lever. service life may vary upon condition of service. Check unit at least once per 8000 hours or longer intervals based upon site experience.

INSTALLATION
  1. Mount the valve in a vertical position so that the valve body is self draining. If a body drain port is provided, make sure it is open when required by the ASME code. Do not plug any bonnet vent openings. The inlet piping should be as short as possible, with no elbows, and equal to or greater than the size of the pressure relief valve inlet connection. This will help to limit the inlet pressure drop to 3% or less when the valve is relieving.
  2. When discharge piping is connected to valve outlet, make sure it is self draining if a body drain port is not used. The valve should not be connected to any discharge pipe that contains pressure before the valve opens or to any pipe where the pressure build-up is greater than 10% of the set pressure when the valve is open and relieving.
    Discharge piping, other than a short tailpipe, must be supported. For steam service, a drip pan elbow or flexible connection between the valve and the pipe should be used to prevent excessive pipe stress, due to thermal expansion, from being imposed on the valve body.
  3. For threaded valves, to prevent sealing compound from entering and damaging the valve, apply a small amount of pipe thread sealing compound to external threads only. Do not put any sealing compound on the first thread or on any internal threads. To do so may cause the sealing compound to enter the valve and cause seat leakage. Do not use the valve body or bonnet for installing the valve in threaded connections. Use the wrench flats provided to tighten the valve to the connecting pipe, and do not over-tighten. To do so may cause valve leakage.
  4. For flanged valves, use new gaskets and tighten the mounting studs evenly.
OPERATION
  1. Maintain a system operating pressure at least 5 psig or 10% below the set pressure of the valve, whichever is greater.  Operating too close to the valve set pressure will cause seat leakage and will shorten the time between valve maintenance.
  2. Do not use the safety valve as a control valve to regulate system operating pressure. Excessive operation will cause the seat to leak and will require more frequent valve maintenance.
  3. ASME Section I and VIII valves equipped with lift levers are designed to be operated only when the system pressure is 75% of set pressure or greater. ASME Section IV valves may be operated at any set pressure. When hand operating the valve, hold it open long enough to purge any foreign matter from the seat area. If a cable or wire is attached to the lift lever for remote actuation, make sure the direction of pull is the same as it would be if the lever were pulled directly by hand.
MAINTENANCE

Maintenance should be performed on a regular basis. An initial inspection interval of 12 months is recommended. Depending on the service conditions and the condition of the valve, the inspection interval may be decreased or increased. Use only Kunkle parts for repair. Depending o the local jurisdictional requirements where the valve is installed, repairs may have to be made by a repair facility holding a VR stamp.

WARNING

Removal of the seal wire or any attempt to adjust, repair, or modify this product by non-qualified or non-authorized persons voids the product guarantee and may cause serious damage to equipment, personal injury, and death. Kunkle Valve is not liable for any damages resulting from misuse or misapplication of its products.

Wednesday, September 19, 2018

What is an Industrial Gate Valve?

Industrial valves
Industrial valves come in a wide variety of types and styles.
 (Image courtesy of Crane)
Industrial valves are used for flow control in industrial processes at specific locations in a piping system. Valves start, stop, throttle, or divert the process fluid flow. Valve application characteristics are diverse, resulting in a broad array of possible valve choices. Valve styles and types have evolved based on their performance, safety, effectiveness, and longevity.

Valve type generally refers to the means employed to control fluid flow, specifically the body style and orifice design. These valve characteristics are used to determine whether a valve type may be suitable for your process application. The most common valve types include gate and globe valves (referred to as linear valves) and ball, plug, and butterfly valves (referred to as quarter-turn valves). All these types of valves have numerous variations and customizations occurring within each type.

The Gate Valve

Gate valve diagram
Gate valve diagram.

Gate valves utilize a movable wedge, often round or rectangular, that is positioned as to restrict the process flow path. This wedge, referred to as the gate or disc, is connected to a valve stem which extends to the exterior of the valve body. Linear motion of the stem will position the gate within the valve body to provide some degree of obstruction to the process flow path. Fully inserting the gate into the media path will shut off the flow, while successively withdrawing the gate will increase the opening through which fluid can pass and allows for increasing flow rates. Seals are provided along the planar surfaces where the gate contacts the valve body.

Gate Valve Advantages
  • When fully open, these valves provide little or no restriction to fluid flow. 
  • This valve type provides a straight through passage.
  • Gate valves can be employed bi-directionally, with flow control effectively available in both directions.
  • Installation space dimensions along the flow path are minimal.
  • Because the gate movement is perpendicular to the flow direction, the energy required to move the gate is generally low, allowing smaller actuators.
  • Closure of gate valves is comparatively slow to other types of valves, reducing the physical shock (hammering) in the piping system.
Additional Gate Valve Application Considerations
  • Valve seals are exposed to the fluid flow as the gate opens. The effects of the process media velocity and media corrosiveness on the seal material may cause deterioration at an unacceptable pace, particularly in throttling applications.
  • Gate valve stems generally extend substantially from the valve body, as they must accommodate the mounting of any required actuator and the entire range of motion of the gate. Some installations may not be able to provide the needed space for this arrangement.
  • The slower speed at which gate valves open and close may not be suitable for some applications.
  • Gate valves are generally not recommended for throttling the process flow, and using them in control applications could  result in gate vibration. There is also concern about expedited seal wear due to the exposure to higher process media velocities while throttling.

Friday, August 31, 2018

What is a Cooling Tower?

An evaporative cooling tower is heat removal device that uses ordinary water to transfer process waste heat from building and equipment into the atmosphere. All cooling towers operate on the principle of removing heat from water by evaporating a small portion of water that is recirculated through the unit.

The mixing of warm water and cooler air releases latent heat of vaporization, causing a cooling effect to the water.  Cooling towers are a key component of many refrigeration systems and can be found in industries such as chemical processing plants, power plants, steel mills, food processing plants, and many other manufacturing companies where process cooling is required.  Cooling towers are also used to provide comfort cooling for large commercial buildings such as universities, government facilities, airports, schools, hospitals, and hotels.

The video below provides a short review of what cooling towers are and why they are important.

Tuesday, August 14, 2018

Industrial Control Valve Basics

Understanding industrial control valve design and operation is very important if you work as a process engineer, a plant maintenance person, or if you design process control loops. Control valves are used extensively in power plants, pulp and paper mills, chemical manufacturing, petro-chemical processing, mining facilities, HVAC and steam distribution systems.

There are many types, manufacturers, body styles, and specialized features, but the they all share some basics operating principles. The video below explains components, operation, and fundamentals of how control valves operate.

https://mnteng.com
303-232-4100

Monday, July 23, 2018

Introducing VSI Controls Control Valves

VSI Controls
VSI Controls™, a newly-formed control valve company and wholly-owned subsidiary of PetrolValves™, offers Customers an exciting alternative to procure general and severe service rotary and reciprocating control valve systems that provide a best-fit solution for their processes.

VSI Controls™ combines the products and technology of Valtek Sulamericana™ - a leading control valves system manufacturer with 35 years’ experience supplying severe service solutions - with the financial strength, global infrastructure and manufacturing and technical prowess of PetrolValves™.

Company Strengths
  • A long history of technology and innovation originating from Valtek Sulamericana™. 
  • The financial strength and global infrastructure of PetrolValves™ 
  • A highly experienced and skilled technical team of control valve experts
Their product offering can be reviewed in the embedded document below, or you can download a PDF of the VSI Controls Control Valve Catalog here.

For more information, contact Mountain States Engineering & Controls by visiting https://mnteng.com or calling 303-232-4100.


Monday, July 16, 2018

Hazardous Area Adjustable Pressure Switch with Turck® Connector Eliminates Need for Junction Box

CCS Series 6900GE* and 6900GZE*Custom Control Sensors (CCS) is a manufacturer of pressure, temperature and liquid flow switches and sensors for the aerospace, defense, industrial and energy markets. They have a new pressure switch design with an integrated Turck® electrical connection that provides an outstanding seal and eliminates the need for a junction box.

CCS Series 6900GE* and 6900GZE*

The Turck® electrical connection provides easy “plug and play” in Class I, Division 2 applications and superior ingress protection.
  • No electrical junction box required.
  • Highly reliable devices utilizing the CCS Dual-Snap® Belleville disc spring principle pioneered by CCS’ engineers.
  • Engineering based on aerospace technology.
  • Rigid, compact and internally adjustable for convenient field set point adjustment.
  • Repeatable and stable set points.
  • Vibration and shock resistant.
  • High cycle life.
  • High over-pressure capability. (System and Proof)
  • Hermetically sealed electrical assembly for environmental protection.
Adjustable set point range:
1 to 3400 PSIG 0.07 to 234 bar 6.89 to 23400 kPa

Operating temperature: Temperature limits change with O-ring selection. -40° to 176°F (-40° to 80°C)

Standard features:
  • CE Mark
  • CRN
  • Dual Seal: ANSI/ISA-12.27.01
  • NACE MR0175 / ISO 15156
  • NEMA: 4, 7, 9,13 / IP66
  • U.L. / cUL
  • Hermetically Sealed Electrical Assembly
  • 316 SST Electrical Assembly
For more information, contact Mountain States Engineering & Controls by visiting https://mnteng.com or by calling 303-232-4100.

Thursday, June 14, 2018

Mountain States Engineering and Controls Products

Mountain States Engineering and Controls represents some of the most recognized and innovative manufacturers in the market today. In some relationships with our manufacturers, Mountain States Engineering and Controls acts as a representative, and with others as a distributor. Depending on the complexity of the application or the product, some material is sold exclusively on a direct basis, where other products are made available through authorized stocking distributors or select wholesalers.

Mountain States Engineering and Controls' products solve challenging problems for industrial and commercial applications in the power, chemical, mining, energy, water treatment, and manufacturing industries as well as in universities, hospitals, and government facilities.

https://mnteng.com
303-232-4100

Tuesday, May 22, 2018

Design of Fluid Systems - Steam Utilization Handbook

Steam Utilization
Recognizing the on-going need for education as it relates to the fundamentals of steam including the most efficient use of its heat content, Spirax Sarco has developed the following handbook on steam ulilization.

This handbook represents over 100 years of steam experience in the proper selection, sizing and application of steam traps, pressure and temperature controls, and condensate recovery systems in major industrial plants throughout the world.

You can review the embedded document below, or you can download your own copy of the "Design of Fluid Systems - Steam Utilization Handbook" here.

Monday, April 30, 2018

Lined and Sleeved Valves Used in Mining Operations

FluoroSeal® Non-Lubricated Plug Valves
Flouroseal Plug Valve
Mining applications can be hard on the equipment. Abrasive, corrosive, erosive — all those conditions apply in varying proportions. FluoroSeal® Non-Lubricated Plug Valves, both Sleeved and Lined, can handle even the hardest of condition combinations, in a variety of mining operations:
  1. Alumina Refineries 
  2. Bauxite
  3. Carbon Strips
  4. Copper
  5. Cyanide
  6. Gold
  7. Lime Slurry
  8. Nickel
  9. Phosphoric Acid
  10. Sulfuric Acid
Read the application note below, or download the Lined & Sleeved Valves for Mining PDF here.

Thursday, April 19, 2018

Mountain States Engineering & Controls

Mountain States Engineering & Controls is a Manufacturer's Representative & Distributor of process equipment and controls headquartered in Lakewood, Colorado since 1978. We serve the markets of Colorado, New Mexico, Wyoming, Montana, Utah, Nevada, Idaho, and the western Dakotas.

https://mnteng.com
303-232-4100

Tuesday, March 27, 2018

Steam - Desuperheating and Attemperation

electric power generation plant
Steam is a motive force used to generate electric power
Industrial operations of many types utilize steam as a heat or power source, plus there is electric power generation. Steam is an important sort of "back office" component of the lives of many dwellers in modern economies.
What is steam?
Sorry, but we need to get everybody on the same page here. Steam is water vapor, produced by the application of heat to water. In order for steam to do work and serve as a useful energy source, it must be under pressure. There can be applications that employ steam at atmospheric pressure, but most are pressurized.

The heat goes on, the water boils, steam is produced and flows through the piping system to where it is used. Sounds simple, sounds easy. It is not. There are intricacies of designing and operating a steam system that determine its raw performance, as well as how efficiently it uses the fuel or other heat source employed to boil water. Steam utilization equipment is also carefully designed to provide its rated performance when supplied with steam of a given condition.

Steam at any given pressure has a saturation temperature, the temperature at which the vaporized water content of the steam is at its maximum level. Heat steam above its saturation temperature and you have superheated steam. Cool it below the saturation temperature and vapor will start to condense. The way in which the steam is to be used determines whether, and how much, superheat is desirable or necessary.
  • Turbine operations benefit from properly superheated steam because it avoids exposure of the turbine to liquid water droplets, generally a source of surface erosion and other accelerated wear.
  • Heat exchanger performance is based upon certain inlet conditions, one of which is the degree of superheat.
  • Maintaining sufficient superheat throughout a continuously operating steam system minimizes the need for, and size of, a condensate return system
Processes are designed to deliver a predictable output when provided with known inputs. In the case of steam, the temperature of the steam may be an input requiring control. This brings us to attemperation, which in the case of steam most often refers to lowering the temperature of a steam supply. Attemperation and desuperheating (reducing the degree of superheat) are accomplished in a similar fashion, but with differing objectives. Attemperation involves simply controlling the temperature of the steam, without any direct regard for the level of superheat. Desuperheating, as a control operation, is not directly related to the temperature of the steam, just the degree by which it exceeds the saturation temperature at the current condition. For attemperation, steam temperature measurement is all that is needed. For desuperheating, pressure and temperature measurements are needed. Decreasing the temperature of superheated steam will naturally reduce the amount of superheat.

Some process requirements may focus on temperature of the delivered steam, without regard to superheat level. Others will rely on a specified level of superheat. The application scenarios are vast, with equipment available to accomplish whatever is needed.

Either operation can be accomplished with a specialized heat exchanger or other device that extracts heat from the steam. Another option relies on the addition of atomized water to the flowing steam to manage temperature or superheat level. Share your steam system challenges with steam system experts, leveraging your own knowledge and experience with their product application expertise to develop an effective solution.

Monday, March 19, 2018

Modular Refrigerated Air Dryer For Industrial Compressed Air

exploded view of refrigerated compressed air dryer
Modular construction of this refrigerated compressed
air dryer combines backup capacity with demand based usage.
Image courtesy SPX Pneumatic Products
Compressed air is a common, and in some cases lifeblood, utility and source of power in industrial plants and operations. It is well established that limiting the moisture in compressed air is preferred. Modern operations increasingly demand drier compressed air supply containing fewer contaminants. Some of the potentially damaging effects of moisture in compressed air systems include:
  • In air operated instruments, corrosion, leading to incorrect readings and false responses by plant operators.
  • In pneumatic controls, clogging of orifices and malfunction of controls due to rust and scale can result in additional maintenance and repair, even process malfunction or shutdown.
  • Spray-on coating operations are impacted by moisture level, which can affect color, finish, and adherence of the applied material.
  • In industrial production equipment, moving parts can experience rust and premature wear due to the washing away of lubrication by excessive moisture in compressed air.
When ambient air is compressed, its temperature increases, but also does the ratio of water per unit of air volume. This results in a compressed air supply with what may be an unacceptably high dew point. Dew point is the temperature at which air is saturated, and cooling air below its dew point will result in the formation of condensate (liquid water). As compressed air is consumed by usage equipment, the air pressure drops, along with the temperature. These condition changes, and others, can result in condensate formation in the compressed air system and connected equipment. This is generally considered a negative development, as the presence of excessive moisture can lead to line freezing, corrosion, excessive equipment wear, and malfunction.

For many industrial applications, removing moisture from compressed air can be accomplished on a continuous basis utilizing a properly configured mechanically refrigerated air dryer. SPX Flow Techonology's Pneumatic Products brand of refrigerated air dryers applies best in class refrigeration technology to deliver substantial energy savings to the process. The ESM product line features:
  • Measurable energy savings.
  • Rapid return on investment
  • Load matching performance
  • Modular construction for multi-station design with isolation for service and maintenance
  • Fault tolerant operation
  • Integral filtration
More detail on the versatility, energy savings, and all around performance of the ESM Series Refrigerated Air Dryers is provided in the product data sheet included below. Product specialists can help you leverage your own knowledge and experience into a successful and effective solution.



Thursday, March 15, 2018

Regenerative Turbine Chemical Pumps

regenerative pump for chemical applications
Regenerative turbine pump for chemical applications
Image courtesy Roth Pump Company
A regenerative turbine pump is significantly different from a centrifugal pump in the way in which liquid moves through the impeller section, making the turbine pump a better performer in a number of industrial applications.

A centrifugal impeller basically traps some liquid at the inlet and rapidly slings through the discharge port. The liquid velocity is increased by the impeller and manifests as outlet pressure. A key distinction between centrifugal and regenerative turbine pumps is that the liquid enters and exits the impeller only one time in a centrifugal pump. A regenerative turbine pump has an impeller with a larger number of smaller, specially shaped vanes. The shape imparts a circulatory movement of the liquid from the vanes to the casing, and back to the vanes. Each return to the vane section increases fluid velocity, resulting in increased pressure. As the impeller rotates, liquid enters, leaves, then re-enters the vane section many times. This process is called regeneration. The impact of this design is a pump that can deliver substantially greater pressure than a centrifugal pump with the same impeller diameter and rotational speed.

A regenerative turbine pump is capable of pumping fluids with up to forty percent entrained gases without damage from cavitation or any performance loss. Fluid conditions with even low levels of entrained gases are generally not recommended for centrifugal pumps because of the degradation in performance, evidenced as fluctuating discharge pressure and excessive wear and vibration. Where cavitation is a concern, the regenerative turbine pump holds the advantage over centrifugal. Applications with low flow and high head requirements will also be better serviced by a regenerative turbine pump.

For chemical applications, assuring compatibility between the casing, turbine, and seal materials is an important step. Performance curves for the various pump models can be used to match a pump and motor combination to the application. Share your fluid transfer requirements and challenges with experts, and leverage your own knowledge and experience with their product application expertise to develop an effective solution.

Wednesday, March 7, 2018

Combining Rupture Discs With Pressure Relief Valves

pressure safety valve
A safety valve protects closed systems from excessive pressure
Image courtesy Kunkle Valve Division - Pentair
Safety and pressure relief valves are common elements of any pressurized system. Their general purpose is to provide a positive means of preventing system pressure from exceeding a preset value, avoiding uncontrolled events that could result in damage to personnel, environment, or assets. Their operating principle and construction are comparatively simple and well understood.

Long term exposure of a relief valve to certain types of process media can result in corrosion, material buildup, or other conditions which may shorten the useful life of the valve, or worse, impair its proper operation. This excessive wear will increase the ongoing cost of maintaining or replacing a prematurely worn valve. One other aspect of relief valves can be the reduction in their seal integrity or force as the system pressure approaches the setpoint. This could possibly lead to fugitive emissions, an undesirable condition.

An effective approach to mitigating some of the effects of exposure to the process media is to install a rupture disc upstream of the safety valve inlet. Isolating a relief or safety valve from the process media through the installation of a rupture disc upstream of the valve inlet eliminates exposure of the costly valve to effects of the media. It is necessary to establish proper rating and selection for the rupture disc to avoid any impairment of the overall operation of the relief valve, but the selection criteria are not complex. A number of benefits can accrue with this concept.

  • Rupture disc isolates the valve from the media, allowing application of less costly valves fabricated of non-exotic materials.
  • Rupture discs are leak free and bubble tight, eliminating possibility of fugitive emissions from the safety relief valve, especially when system pressure may approach valve setpoint.
  • Relief valve inventory can be evaluated for reduction.
  • Longer valve life.
  • Less downtime.

The additional cost for the rupture disc enhancement can have a reasonable payback period, with all factors considered. In any case, the rupture disc protection makes for a cleaner relief valve installation. Rupture discs and holders are available in sizes and materials for most applications. Share your ideas with a valve specialist, combining your process knowledge with their product application expertise to develop an effective solution.

Friday, February 23, 2018

Industrial Diaphragm Valves

sectional drawing weir type diaphragm valve with pneumatic actuator
Section drawing of diaphragm valve, weir type,
with pneumatic actuator.
Image courtesy Gemu Valves, Inc.
Diaphragm valves are named for the means employed in their design to restrict the path of fluid flow through the valve. Most valve designs employ a rigid solid shape which is repositioned in the fluid path to regulate flow. Diaphragm valves are somewhat unique in their use of a flexible material that is deformed by a moving part connected to the valve operating mechanism. The diaphragm acts as the flow restrictor and seat. It also isolates the valve bonnet and stem from the flowing media.

The fluid path and diaphragm positioning and seating enable this valve type to be used for throttling or simple stop operations. They are generally tolerant of particulate matter entrained in the media. Selecting body and diaphragm materials that are compatible with the media are primary elements of achieving a successful application. The diaphragm is a wearing part and should be inspected periodically and replaced when necessary.

Diaphragm valves for industrial use are available in a range of materials and sizes to accommodate light through heavy duty applications.
  • Suitable for inert and corrosive liquid and gaseous media when proper valve body and diaphragm materials are selected
  • Bonnet and valve bodies available in metal or plastic construction
  • Insensitive to particulate media
  • Valve body and diaphragm available in various materials and designs
  • Compact design
  • Automation via pneumatic or electric means
Share your fluid process control challenges with valve application specialists. Leverage your own knowledge and experience with their product application expertise to develop an effective solution.

Sunday, February 18, 2018

Getting Benefit From Waste Steam With a Thermocompressor

steam thermocompressor
Steam thermocompressor enables use of waste steam
in higher pressure applications.
Image courtesy Spirax Sarco
Steam, with its utilization as a means of transferring heat, as well as a motive force, is found in use throughout many industries. The production of steam is a significant cost of operation for any business where it is employed. Steam, after performing its intended function, still contains a comparatively large amount of heat, so methods of recovering or utilizing that heat energy remaining in waste steam is a positive step in conservation.

Energy conservation and energy efficiency have contributed very large cost savings to many industrial and commercial operations over the past two decades. Projects with modest payback periods quickly contribute to the bottom line of the operation's balance sheet. It is not uncommon for  energy conservation and efficiency measures contribute to improvement in the overall functioning of the steam utilization equipment or systems. In order to save energy, it is generally necessary to exercise better control over equipment or system operation by gathering more information about the current operating state. This additional information, gathered through measurement instrumentation, often finds use in several ways that improve productivity and performance.

A thermocompressor is a type of ejector that mixes high pressure steam with a lower pressure steam flow, creating a usable discharge steam source and conserving, through reuse, the remaining heat content of the otherwise wasted low pressure steam. The device is compact and simple, with no moving parts or special maintenance requirements. Two general varieties are available. A fixed nozzle style is intended for applications with minimal variation in the supply and condition of the suction steam (the low pressure steam). Some control is achievable through the regulation of the high pressure steam flow with an external control valve. A second style provides a means of regulating the cross sectional area through which the high pressure steam flows in the nozzle. This style is best applied when specific discharge flow or pressure is required, or there is significant variation in the inlet steam conditions.

Share your steam system challenges with a steam system application specialist. Leverage your own process and facilities knowledge and experience with their product application expertise to develop effective solutions.