1 Determining key specifications of control, throttle, relief valves on the basis of questionnaires
Calculating capacity, clear area, number of throttling steps on the basis of questionnaires and design diagrams. Analysis is carried out for following media: cold water, effervescent condensate, steam, steam-water mixture, oil and oil products, gas.
2 Analysis of reduction cooling installations, cooling installations
Determination of the necessary amount of water, geometry of nozzles, number of throttling stages and their area, necessary pipe diameters, number and capacity of relief valves.
3 Finding integral hydraulic properties of valves using specialized software
Flow analysis of valves using specialized software for cold water (20˚) and calculation of the following parameters:
– capacity (important for control and throttle valves);
– hydraulic resistance coefficient (important for stop valves, check valves, pipe fittings);
– critical pressure coefficient (to find critical drops in steam and gas valves);
– cavitation start coefficient;
– coefficient of developed cavitation;
– finding stagnant and vortex shedding zones.
4 Flow analysis of valves for actual parameters (static)
Flow analysis of valves using specialized software in real operating environment with operating parameters. The operating environment can be:
– water (modes without cavitation, boiling, evaporation);
– steam, gases (subcritical drops, subsonic speeds).
This analysis, in addition to analysis 3, allows to determine:
– static forces acting on the working surfaces of the valve.
5 Flow analysis of valves for actual parameters (dynamic)
Flow analysis of valves using specialized software in real operating environment with operating parameters. The operating environment can be:
– water (modes without cavitation, boiling, evaporation);
– steam, gases (subcritical drops, subsonic speeds).
This analysis, in addition to analysis 3, allows to determine:
– change in forces acting on the working surface of the valve considering vortex motion in time;
– frequency of vortex shedding (possible vibrations).
6 Flow analysis of valves for actual parameters (dynamic) and strength analysis
Flow analysis of valves using specialized software in real operating environment with operating parameters. The operating environment can be:
– water (modes without cavitation, boiling, evaporation);
– steam, gases (subcritical drops, subsonic speeds).
This analysis, in addition to analyses 4 and 5, allows to determine:
– stress strain state of valve parts in existing operating parameters;
– solving the strength / hydraulics problem (taking into account the effect of valve strain on the working medium flow);
7 Parametric flow analysis
This analysis produces result similar to that of analyses 3, 4, 5, 6, taking into account remeshing (opening or closing of valves). Parametric geometric model is built and geometry is manipulated over time with set increments. Applications:
– obtaining the flow curve of the valve (depending on stroke) with high accuracy and resolution (for example, with an increment of 1% stroke);
– finding forces acting on the valve parts during closing / opening and needed to control valves throughout the stroke;
– diagnosing possible vibrations at closing / opening of valves (coalescence of vortex shedding frequency with the natural frequency of valve parts).
8 Force analysis
Force analysis of any type of valves to determine force and torque required to select and control the drive.
9 Strength analysis of general-purpose industrial valves
Analysis of pipe fittings in accordance with GOST R 52857-2007 Vessels and tanks. Strength analysis standards.”
10 Strength analysis of valves for thermal power plants
Analysis of pipe fittings in accordance with RD 10-249-98 Strength analysis standards for stationary boilers and steam and hot water pipelines.
11 Strength analysis of valves for nuclear power plants, including confirmatory analysis
Analysis of pipe fittings in accordance with PNAE G-7-002-86 Strength analysis standards for equipment and pipelines of nuclear power plants, including:
– dynamic analysis of reactive forces triggered by quick-response units;
– analysis of flanged and wafer connections for leaks;
– low-cycle fatigue analysis;
– calculation of loads from pipelines;
– analysis of temperature effects;
– analysis of resistance to brittle fracturing.
12 Strength analysis of pipe fittings according to ST CKBA
Strength analysis in accordance with the requirements of ST CKBA
13 Stress strain analysis of cast body parts
Analysis undertaken to identify areas of stress strain in body parts in accordance with OTT-75.180.00-KTN-021-13 in valves supplied to OAO AK Transneft operations
14 Seismic impact analysis of general-purpose industrial valves
Analysis of pipe fittings in accordance with GOST 30546.1-98 General requirements to machines, devices and other industrial products and methods of seismic resistance analysis”
This analysis is performed for valves supplied to OAO Gazprom, OAO AK Transneft operations
15 Seismic impact analysis of valves for thermal power plants
Analysis of pipe fittings in accordance with RD 10-249-98 Strength analysis standards for stationary boilers and steam and hot water pipelines.
16 Seismic impact analysis of valves for nuclear power plants
Analysis of pipe fittings in accordance with PNAE G-7-002-86 Strength analysis standards for the equipment and pipelines of nuclear power plants, NP-031-01 Design standards for earthquake-resistant nuclear power plants, NP-068-05 Pipe fittings and valves for nuclear power plants
17 Vibration resistance analysis of valves for thermal power plants
Analysis of pipe fittings in accordance with RD 10-249-98 Strength analysis standards for stationary boilers and steam and hot water pipelines.
18 Vibration resistance analysis of valves for nuclear power plants
Analysis of pipe fittings in accordance with PNAE G-7-002-86 Strength analysis standards for the equipment and pipelines of nuclear power plants, NP-068-05 Pipe fittings and valves for nuclear power plants
19 Reliability analysis of pipe fittings and valves
Reliability analysis in the valve design phase in accordance with RD 24-207-06-90 Pipe fittings and valves. Reliability analysis in the design phase
20 Reliability analysis of pipe fittings and valves
Reliability analysis in the valve design phase in accordance with CKBA 008-2011 Pipe fittings and valves. Safety and reliability analysis and assessment in the design phase
21 Crack resistance analysis (fracture toughness)
Analysis of crack resistance (stress intensity factor) in a specialized software package in the design phase of valves.
Analysis of existing cracks and assessing their acceptability.