I would like to ask the experts: is it possible to change the API 23 scheme to the API 21 scheme?
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I would like to ask the experts: is it possible to change the API 23 scheme to the API 21 scheme? The on-site conditions are as follows: 1. Operating conditions: Medium: Poorly alkaline solution ； Temperature: 126.1°/30°. Inlet pressure: 0.17 GP; Outlet pressure: 1.2 GP. Motor speed: 1475 revolutions per minute. 2. Auxiliary system: API PLAN 23. 3. Pump manufacturer: Shenyang Greed; Model: ZHYa 200-630. Sealing component used: Sichuan Yitong, single-face seal. After replacing the seal, it started leaking after 2 months of operation – approximately 10 drops per minute. We believe that the temperature of the sealing surface is too high due to friction and the medium temperature of 130°. Since this pump uses self-flushing, it’s possible that the amount of fluid used for flushing is insufficient; in other words, the circulation volume is too low and the flow rate of the flushing liquid is too slow. This leads to failures in the sealed friction pair. I would like to ask the experts: Under the current operating conditions, can scheme 23 be changed to scheme 21? If possible, could a pipe be taken from the valve on the pump outlet return line and connected to the sealed flushing line? If not relying on the manufacturer’s own modifications, what issues should be taken into account? How to change it? ? Thank you so much! !
The API 23 scheme can be changed to the API 21 scheme, but the following points need to be taken into consideration: 1. Ensure that the temperature of the flushing fluid introduced (drawn from the pump outlet) is appropriate, to avoid issues with the sealing performance due to excessive temperature. 2. The flow rate and pressure of the modified flushing fluid must meet the requirements for sealing cooling and cleaning, in order to prevent the sealing surfaces from overheating or becoming contaminated with deposits. 3. Verify the safety of the modified pipelines and connections to prevent leaks or looseness. 4. Regularly check the operation of the upgraded system and make timely adjustments and optimizations. If relying on the manufacturer’s own modifications is not feasible, it is recommended to hire professional technicians to develop a modification plan, and to conduct system tests before and after the modification to ensure safe and reliable operation. .
Hello, thank you for getting back to me. If a flow-limiting orifice is installed on this pipeline, how should its diameter be calculated? How large do the holes generally need to be?
Calculating the orifice size for flow limitation usually requires determining parameters such as the flow rate of the flushing fluid, pressure, and pipe diameter. The following are the general steps and considerations: 1. **Determine the required flow rate**: Determine it based on the optimal flushing flow rate needed for sealing. 2. **Calculate flow velocity and pressure drop**: Use Bernoulli’s equation or similar fluid dynamics principles to compute these values based on the fluid’s density and viscosity, the length and diameter of the pipes, as well as the required flow rate. 3. **Port design**: The flow rate calculation formula is Q = A * sqrt(2 * ΔP / ρ), where Q is the flow rate, A is the cross-sectional area, ΔP is the pressure drop, and ρ is the fluid density. From this formula, the effective cross-sectional area A of the hole required can be derived, and from that the hole diameter can be calculated. The aperture size usually also needs to take into account factors such as potential blockage and wear in actual operation, and is slightly larger than the theoretically calculated value. 4. **Testing and Adjustment**: After preliminary calculations, on-site testing may still be required during actual installation, and the aperture size may need to be adjusted based on the actual operating conditions. Since the calculation of the specific pore size involves multiple variables, including the operating parameters and physical properties of the specific equipment, it is recommended to consult relevant mechanical engineers during the design process or use specialized fluid dynamics software for calculations, in order to ensure accuracy and safety. At the same time, it is advisable to consult the original equipment manufacturer before making any changes, to ensure that the modifications will not affect the proper operation of the device or its warranty terms. .
Why not consult Shenyang Grid? His family is still very professional
Standard requirements: The minimum pore size of the orifice plate is 3.2 mm; attention must also be paid to the cleanliness of the medium and whether the flow rate of the cooling water is sufficient
There are no contact details for the technicians from his company
To determine whether a change is possible, one first needs to look at the heat exchanger; PLAN23 may be equipped with a heat exchanger having a heat exchange area of 0.4 m2, while for PLAN21, a heat exchanger with an area of 0.6 m2 would be required； If there is enough heat exchange area, it can be modified; the head of this pump needs to be over 100 meters. A orifice plate should be installed at the PLAN21 inlet to regulate flow and reduce pressure~
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