The initial steps of the development of prestressed concrete containment (PCC) for nuclear power plant (NPP) with pressurized water reactors (PWR) in the former USSR are analyzed.
Dismounted hydrostatic differential cylinder of the concrete pump A simplified nonlinear velocity controller was designed and implemented according to section 2. Figures 10, …
A Practical Guide to Noise and Vibration Control for HVAC Systems. Sophanit Phal. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 35 Full PDFs related to this paper. Read Paper. A Practical Guide to Noise and Vibration Control for HVAC Systems.
Mar 01, 2017 · Structural vibration can be a problem with most machines, particularly with vertical turbine pumps. These pumps are commonly suspended from the discharge elbow with the motor mounted above, making them difficult to stiffen and damp. With low stiffness and damping, natural vibration frequencies in the machine operating range are inevitable, as well as reliability issues from excessive vibration.
Mar 05, 2020 · In order to control concrete pavement cracking and subsequently maintain Proper curing of concrete to prevent high initial shrinkage and cracking of hardening concrete. which initially occurs along pavement joints, or over-vibration can lead to low air content, which can lead to early deterioration of pavement joints. 8.
Pump foundation. Proper pump foundation reduces vibration levels, which in turn leads to a significant increase in Mean Time Between Failures (MTBF), extended lifetime of mechanical seals and bearings and consequently reduced total life cycle cost.. Pumps have to be properly secured to their base plates, which in turn have to be well-bonded to the underlying foundation.
The nonlinear time-delay dynamic absorber has a good control effect on the main system under harmonic excitation, but the control effect on the main system under complicated excitation is not obvious. In the previous study, they do not have an effective method to obtain the time-delay control parameters under different external excitations. Because of the above problems, this paper proposed …
A measuring system for measuring rheological properties of a concrete mix tested when contained, the system comprising, a surface in contact with part of a mass of said concrete mix; a shearing unit for effecting shear deformation in said mass, along the direction of a shearing plane crossing through said concrete mass; and at least one sensor which senses a measure of the force which is
Crane Incident Site Initial Steps Measure Lift Radius Boom Configuration Load Determination wheels or a concrete foundation that must be able to resist the combined weights and tipping forces of the load, boom, counterweight, and crane superstructure. hydraulic pump(s) driven by crane engine, controls are electronic or hydraulic)
Feb 05, 2021 · Various methods have been adopted by scholars to explore the vibration features of the conventional concrete pumping station, such as quasi-static method, harmonic response method and the dynamic time-history method [13,14,15,16]. Usually the spatial distribution of the dynamic displacement and stress was presented, and the vibration amplitudes
Concrete is to be placed as close as possible to its final position and not moved laterally by vibration. Concrete is not to be over vibrated. Concrete is not to be dropped from a height exceeding 2m. "Cold joints" of more than 40 minutes shall be avoided. Concrete shall be placed not later than one hour after the addition of the mixing water.
Jan 01, 2017 · All the vibration in the world won't make a difference if the concrete isn't first handled and poured well. The first step is to make sure that you have backup systems in place for every part of the job, including extra vibrators and other tools. Plan out the pour to avoid hiccups during the job. Mix of concrete should be correct.
Specifying quiet equipment and adding noise control materials to an HVAC system design are necessary initial steps of the design process. Calculations during the initial steps can be used to estimate the sound levels in a room or to select noise control materials to achieve a design goal.
Pump sets can also be installed behind a huge obstruction or barrier so as to block the line of sight between the equipment and the receiver. Installing pump sets on paving slaps or solid concrete base can also help to absorb vibration thus allowing pumps to run smoothly. Sound Isolation. This technique is useful, particularly for noisy water
A system is designed to measure concrete rheological properties which includes a concrete plant, a measuring unit and a mix changing unit. The measuring unit includes a surface in contact with a part of a mass of the concrete mix, a shearing unit for effecting shear deformation in the mass and at least one sensor which senses a measure of the force which is transferred to the surface by the
Now let's get to the 10 steps to pump reliability. The top 10 steps you can take to achieve sustainable pump reliability are: Proper Design and Equipment Selection. Proper Installation and Commissioning. Proper Flow Control. Proper Operation. Proper Maintenance. Stock the Right Parts. Monitor Efficiency. Track Lifecycle History.
Floor Vibration Control - DEICON
Jul 14, 2021 · Formwork vibration: Formwork vibration is commonly used in precast concrete construction and involves mounting the vibrators to the outsides of the concrete forms.For larger pours, the external form vibrators are often spaced 6 feet apart. Surface vibration: With surface vibration, large vibrators (sometimes called "jumpers") are directed manually onto the surface of the poured concrete.
May 22, 2018 · Applying concrete finishes to increase longevity. May 22, 2018. Brewery with a urethane cement floor coating. All images courtesy Tennant Coatings. by Kendall Youngworth. The first step in the proper repair of a damaged concrete floor is a professional evaluation of the surface to identify the cause. This article specifically applies to
6 Tips for Perfecting Poured Concrete: Vibration | Forming
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