Mitigating Water Hammer in Municipal Water Systems: The Value and Unique Design of Kinetrol's Steadyline Actuators

Water hammer, or hydraulic shock, is a significant challenge in municipal water treatment systems. This phenomenon occurs when a sudden change in water flow velocity—often due to rapid valve closure—creates a pressure surge or shock wave within the pipeline. Depending on pipe material and water temperature, these surges can travel at speeds up to 1,400 meters per second, potentially causing severe damage to infrastructure, disrupting water supply, and compromising water quality.

Fast-closing valves are the primary instigators of water hammer events. An abrupt valve closure instantaneously halts the momentum of flowing water, leading to a pressure spike that can exceed the pipeline's design limits. This can result in burst pipes, damaged fittings, and failed valves, necessitating costly repairs and posing risks to public safety. 

Rotary hydraulic dampers, commonly referred to as dashpots, are silicone filled, vacuum sealed devices, expertly designed to regulate the velocity and smoothness of rotational movements.

Kinetrol's Steadyline actuators offer an innovative solution by combining a standard Kinetrol rotary actuator with an attached rotary dashpot to govern the valve's closing speed. This design leverages the reliability and performance of Kinetrol's established rotary actuators while integrating a specialized dashpot mechanism that precisely controls the actuator's rotational movement during valve closure.

The Steadyline actuator's configuration involves mounting a rotary dashpot directly onto the standard actuator's output shaft. The dashpot consists of a rotor moving within a fluid-filled chamber, where the viscous fluid resists the rotor's motion. As the valve begins to close, the dashpot slows down the rotational speed by absorbing kinetic energy through fluid friction. This controlled resistance ensures the valve closes smoothly over a predetermined period, significantly reducing the risk of inducing water hammer.

Beyond preventing physical damage to the pipeline network, the controlled valve closure provided by Steadyline actuators improves operational efficiency. By mitigating water hammer, the actuators reduce stress on pipes and fittings, extending the lifespan of the entire distribution system.

Implementing Kinetrol's Steadyline actuators can lead to substantial financial savings for municipal water utilities. By preventing infrastructure damage and reducing the frequency of repairs, utilities can allocate resources more effectively and avoid unexpected expenses. 

Kinetrol's Steadyline actuators provide a valuable and practical solution to the challenges water hammers pose in municipal water treatment systems. By integrating a standard rotary actuator with an attached rotary dashpot, these actuators offer precise control over valve closing speeds without compromising reliability or ease of installation. This design not only safeguards the physical infrastructure and ensures efficient water supply system operation but also contributes to maintaining water quality and delivering financial benefits through reduced maintenance costs. For municipalities seeking to enhance the safety and sustainability of their water distribution networks, adopting Steadyline actuators represents a strategic investment in advanced engineering solutions.

Kinetrol USA
https://kinetrolusa.com
972-447-9443

Kinetrol Steadyline Actuators Mitigate Water Hammer Damage from Pump Station

Water hammer occurs when a pipe's fluid flow changes rapidly. The effect may be high pipe pressures, mechanical stress on pipe structures, and potential flow reversal. If not controlled, it can cause pipe bursting, pipe breaking and joint leakage. Vane actuators open and close valves and can be tightly controlled with regards to opening and closing speeds. The Kinetrol Steadyline series are precision valve actuators with built-in damping devices providing a smooth resistance to shaft rotation which increases with angular velocity. The Kinetrol Steadyline product smooths out the normal travel, dampens any valve-flow induced disc oscillations, and provides a minimum user-specified amount of travel time on power failure.

A water treatment facility pump station was having recurring problems with a large hydraulic actuator that was very cumbersome and expensive to maintain. The well engineered solution was a Kinetrol Size 14 Steadyline double acting actuator with digital speed controllers installed on 12” Pratt butterfly valves. The result: better performance, reduced downtime, lower cost of operation. 

Kinetrol USA

https://kinetrolusa.com

972-447-9443

Wastewater Treatment Facilities Being Solicited to Test for Virus Causing COVID-19

New studies show that SARS-CoV-2, the virus causing COVID-19, is shed in human waste, meaning it’s collecting in city sewers. 

Biobot, a Somerville, Massachusetts company specializing in wastewater epidemiology, is establishing protocols to test sewage for SARS-CoV-2. If successful, this data will give communities a dynamic map of the virus as it spreads to new places.

Data from sewage will enable communities to:

1. Measure the scope of the outbreak independent from patient testing or hospital reporting, and include data on asymptomatic individuals,
2. Provide decision support for officials determining the timing and severity of public health interventions to mitigate the overall spread of the disease,
3. Better anticipate likely impact on hospital capacity in order to inform hospital readiness and the necessity of public health interventions,
4. Track the effectiveness of interventions and measure the wind-down period of the outbreak, and
5. Provide an early warning for reemergence of the coronavirus (if it does indeed have a seasonal cycle).

How it works:

• Biobot will ship participating facilities a sampling kit and sample collection protocols. Each sampling kit includes supplies for transporting one sewage sample, an ice pack, a return shipping box and label, and instructions.
• Wastewater facilities will collect 24-hour composite samples, and ship the samples back to Biobot laboratories.
• Biobot will process the sewage samples to concentrate and inactivate viruses.
• MIT Alm Lab will apply a RT-PCR protocol, adapted from published testing protocols, to detect the SARS-CoV-2 virus.
• Biobot will communicate the test results back to participating communities.

How to receive sampling kits:

Wastewater treatment facilities interested in participating should visit this site - https://www.biobot.io/covid19 - and fill out the form.

Upper Midwest Water Treatment Plant says "Out with the old, in with the new!"

Before project.

Project begins.

An Upper Midwest water treatment plant was experiencing high failure rates, long maintenance periods, and too many repair issues with their existing pneumatic scotch-yoke cylinder valve operators. 

Upon investigation, the problem boiled down to how the scotch-yoke cylinder's linear movement is converted to rotational movement. To do so requires gearing, yokes and linkage which are wear points. In medium to high cycle rate applications these wear points soon become failure points. 

Kinetrol rotary vane actuators utilize a single moving part - the one-piece vane and shaft.  There are no gears, yokes, or linkages and 100% of the movement is transferred to the actuator shaft. The one piece vane and shaft eliminates these wear points, and therefore eliminates the resulting failure points.

Out with the old.

In with the new.

After a planning review meeting, this particular water treatment plant clearly saw the advantages of the Kinetrol design. The argument was so strong and the case so clear,  they decided to replace all (60) scotch-yoke cylinder actuated valves with Kinetrol vane actuators in one fell swoop. 

The new actuators have been operating for 6 months now without problem, cycling approximately 15 times per day. 

Click on the images above to see a larger view. For more information, contact Kinetrol USA by visiting https://kinetrolusa.com or by calling 972-447-9443

Kinetrol Vane Actuators: Performance Under Pressure

Here is a short video of Kinetrol valve actuators installed in power plant, chemical plant, cement plant, water treatment, and primary metal plant applications.

https://kinetrolusa.com 

972-447-9443

WEFTEC 2017

WEFTEC is recognized as the world’s largest annual water quality technical conference and exhibition, providing extensive educational opportunities and unparalleled access to the field’s most cutting-edge technologies and services.

WEFTEC's expansive show floor provides unparalleled access to the most cutting-edge technologies in the field; serves as a forum for domestic and international business opportunities; and promotes invaluable peer-to-peer networking among registrants.

The conference provides insights and products for water and wastewater technologies including:

• Collection Systems - Management, operations and maintenance, infrastructure, overflow reduction, wet weather planning, watershed approaches, and regulations
• Energy Conservation and Management - Resource recovery, combined heat and power, biogas optimization
• Membrane Technologies - Application in wastewater and water reuse, innovations, enhanced performance, regulatory compliance
• Plant Operations and Treatment - Innovations, technologies, processes, and proven solutions in water and wastewater treatment; including nutrient removal and odor control
• Regulations - CMOM/SSO Rules, TMDL/Watershed Rules, Nutrient Trading, and NPDES Phase II
• Research - Leading edge process applications in water and wastewater treatment and recent developments
• Residuals & Biosolids - Incineration, disposal, reuse through land application, research, regulations, politics, and public perception
• Stormwater - Treatment, green infrastructure, wet weather management, modeling
• Utility Management - Asset Management and financial planning for infrastructure, technology, regulatory compliance, and security; including environmental management systems (EMS)
• Water Reuse/Recycling - Research, regulations, emerging technologies, proven processes
• Water Quality & Watershed Management - Stormwater, wet weather, and watershed issues

Kinetrol is exhibiting again this year and will be in booth 4136. Please come by and visit us if you attend.

Exhibition Details:
McCormick Place | Chicago, IL
Exhibition: October 2 - 4, 2017
Hours: 8:30 am - 5:00 pm daily
COME VISIT US AT BOOTH 4136

Rugged Design Makes This Vane Actuator the Best Choice for Any Valve or Damper Automation Job

Watch the video below for a quick understanding of why Kinetrol Vane Actuators provide the longest service life in the toughest valve and damper applications.

Kinetrol + Plug Valve = Optimum Sludge Valve Performance

Water treatment plant

Sewage sludge is the semi-solid material that is produced during sewage treatment of industrial or municipal wastewater. Sludge blowdown valves are used in water and wastewater treatment systems that separate solids prior to filtration. These valves are particularly susceptible to fouling and ultimately prone to failure.

Many valve manufacturers specify high-pressure/high-torque actuators to overcome the sludge. Many times they choose linear type valves and screw-type linear actuators because they provide the brute force needed to push through the sludge. An unwanted side-effect of using linear valves and actuators is that the same force used to push the disc through the sludge, also causes valve damage by pushing and grinding solids into the valve seats, disc and seals. Eventually, the valve becomes so damaged it no longer provides proper shut-off.

Kinetrol actuator

Pneumatic scotch yoke and rack and pinion actuators, with quarter-turn valves, can provide the torque required for opening and closing the valve, and the nature of some quarter-turn valve designs protect internal parts from damage. Plug valves are designed this way and when combined with double acting pneumatic actuators that operate on a controlled time frequency, are a very reliable design for this application. The cycle frequency depends on the amount of solids in the media, and cycle times of opening and closing every 20 minutes are common. This cycle rate however, is problematic for scotch yoke and rack and pinion actuators, causing them to fail prematurely. In some cases the actuators fail in only 3 - 4 months of use.

For sludge applications, Kinetrol rotary vane actuators mounted on quarter-turn plug valves are a great choice . The combination of the high cycle actuator design, with the design benefits of a plug valve, offer wastewater treatment operators a valve assembly that will provide years of trouble-free life.

Superpulsator Vent Valve Operation Demands Performance

Kinetrol on Superpulsator Vent Valve

Water treatment involves multiple physical, chemical and biological processes that transform raw water into drinking water. Clarification, which includes the removal of excessive color or turbidity of raw water to produces clear uncolored water, is one of these processes. Clarification typically includes coagulation, flocculation and settling.

A Superpulsator unit is a simple type of clarification system utilizing an upward flow tank and inclined plate settling.  It operates by varying the level of the flocculation tank through the use of a vacuum pump and vent valve. The pump creates a vacuum in the tank causing the water level to rise. A vent valve then opens to atmosphere causing the water level to fall. The valve is then closed, and the process repeats itself continuously. The actuated vent valve is controlled by a timer set to pre-defined vacuum and vent cycles.

A Kinetrol USA Distributor was called in to assist in a water treatment plant’s upgrade to superpulsators. After reviewing the application, the Distributor specified 4" plug valves actuated with Kinetrol vane actuators and Kinetrol ULS limit switches. The plant’s original system was using double acting, air cylinder operated valves. These had to be replaced because they wouldn't be able to withstand the superpulsator's constant vacuum and venting cycling. The more robust Kinetrol actuator, capable of very high cycle rates, was clearly the best choice.

After installation and startup, and several years in operation, the Kinetrol actuators are performing flawlessly and are providing maintenance-free operation.

Kinetrol Vane Actuators Replace High Maintenance Pneumatic Cylinders in Water Treatment Plant

Kinetrol Rotary Vane Actuator

A Kinetrol USA Western Distributor was told by a water treatment plant operator that two 10" Pratt butterfly valves with cylinder actuators were not working reliably. The valves were okay, but the pneumatic cylinders were a maintenance nightmare. Not only did they introduce far too much hysteresis (slop) in the actuator-to-valve movement, but they also leaked air, and in the winter time had to have a heater placed next to them to keep the cylinders from sticking. The cylinder seals were so poor moisture would penetrate the cylinder and freeze, rendering the actuator unresponsive.

An experienced, application savvy Distributor came to the water treatment plant's rescue. After looking at the application the Sales Engineer specified new butterfly valves and Kinetrol Model 14 double acting actuators, manual gear overrides, AP positioners with I/P, ULS limit switches, angle retransmit, and point-of-use filters.  He knew the Kinetrol actuators would not only eliminate the constant maintenance, but also provide much tighter control.

After 1 year of continuous service, the actuators have performed flawlessly without any downtime. The maintenance crew at the water treatment plant are so pleased they plan on standardizing.

Kinetrol Actuators. Field Tested. Application Driven.

Kinetrol actuators on butterfly valves for water treatment plant.

Water Recycling Application at Iron Ore Mine

Mining corporations need water - a lot of water - to make bare rock give up its valuable minerals.

Water is used for the extraction of minerals that may be in the form of solids, such as coal, iron, sand, and gravel. The category includes quarrying, and milling (crushing, screening, washing, and flotation of mined materials).

Not only is water used to expose the mineral, it must be carefully managed to prevent the release of contaminated water back into the environment.

There are multiple processes involving the management of water that require piping, valves and automation for water management.

• The reuse of water used to extract the minerals from the other solids.
• Managing surface water from rain, snow, and streams.
• Capturing and recycling water from the mine site.
• Storing water in evaporation ponds.

At a large Midwest iron ore mining facility, a Kinetrol Distributor was contacted to look at ways to lower the overall consumption of water in the main water treatment plant.

The Distributor designed and provided this characterized butterfly control valve, with a Kinetrol actuator, pneumatic positioner, and cone indicator.  The valve is used to recycle processed water back into the plant for reuse in the extraction process. The valve and actuator experiences a very high cycle rate (400 cycles per day).

Intercepting and diverting surface water

• Intercepting and diverting surface water (rain and snowmelt runoff, streams, and creeks) from entering the mine site by building upstream dams to reduce the potential for water contamination from exposed ore and waste rock
• Recycling water used for processing ore in order to reduce the volume of water requiring treatment
• Capturing drainage water from precipitation at the mine site through the use of liners and pipes and directing the water to tailings dams in order to prevent potentially contaminated water from entering groundwater or flowing off site
• Allowing the water to evaporate in ponds to reduce the volume of contaminated water; in dry regions, enough water may be evaporated that no water needs to be discharged, resulting in the containment of contaminates at the mine site
• Installing liners and covers on waste rock and ore piles to reduce the potential for contact with precipitation and contamination of groundwater

- See more at: http://www.miningfacts.org/Environment/How-is-water-managed-and-treated-in-mining/#sthash.0qMpVdHr.dpuf