Selection of liquid ammonia filling pump
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This post was last edited by ZZJJAA70 on 2009-11-13 at 13:11. Hello, fellow sailors! I need to fill the ultra-pure ammonia coming out of the distillation tower as well as the ultra-pure ammonia in the product storage tank in the near future. I need to choose a pump for this purpose. For ordinary liquid ammonia, liquid ammonia pumps and shielded pumps are used for filling, but for ultra-pure liquid ammonia, what type of pump should be used to avoid contamination? The specific parameters are as follows: the flow rate of liquid ammonia at the outlet of the distillation tower and the product storage tank is 200 kg/h, the pressure is 8 kilograms, and the filling pressure is estimated to be around 12 kilograms. I’m not sure if there is any issue with this filling pressure If there are no issues, what type of pump should be used? Note: If recommended by the manufacturer, a product description and quote can be attached as well. For urgent purchases, contact: QQ9685238, email: gaosong02101054@163.com
Could any of the seniors give me some advice? I need to submit the proposal by Monday; it’s such pressure{:2_34:}
This post was last edited by ZZJJAA70 on 2009-11-14 07:02. 2# gaosong08: I did create one before; it used shielded pumps. The **liquid ammonia Pump 1# and Pump 2# have had their parameters verified by professionals in mechanical, electrical, and instrumentation fields, and the conditions are met for testing. To ensure the safe and proper operation of Pumps #1 and #2, a commissioning leadership team was established to organize the commissioning process for these pumps for transporting **liquid ammonia. I. Test Run Leadership Team: Team Leader: Team Members: Test Run Participants: II. Preparations before the test run 1. Relevant personnel for the test run arrive at the site and clarify their respective responsibilities. 2. Check whether the equipment, pipelines, and valves are in good condition. 3. Check whether the foot screws and connection screws of the motor and electric pump are loose. 4. Check whether there is sufficient water in the tank; remove the flange of the nitrogen pipe connection and connect a temporary pipe to the tank ； 5. Open the inlet and outlet valves of the pump as well as the pump’s exhaust valve to release air; close them once all the air has been expelled. 6. Prepare the test run record form. III. Starting the pump: 1. Open the inlet valve, start the electric pump, and conduct a single-start test run of the pump; after measuring the following values, stop the pump. Based on the measured values, determine whether the electric pump is operating properly. Identify the cause based on Table 2 and eliminate the fault. (1) Discharge pressure and suction pressure: Pressure difference ≈ Discharge pressure – Suction pressure ≈ Head × Specific gravity ÷ 10 ； When the pressure difference is too low, the pump may reverse direction; please consider this in conjunction with the TRG reading. It is normal for the pressure difference to correspond to the specified head value. (2) TRG indication value: The red area (above the range) indicates that the electric pump is operating in reverse; please ensure proper wiring ； The green area (below 0.3) indicates normal operation. (3) Voltage and current: The voltage and current are measured according to the rated voltage and rated current indicated on the nameplate. (4) Check for any abnormal noises or vibrations caused by the presence of foreign objects during operation. 2. After confirming that the equipment is operating properly and that the current and voltage are rising steadily within normal ranges, slowly open the pump outlet valve, and adjust it to achieve the desired water flow rate by adjusting it based on the pressure and current levels. IV. Parking 1. Close the outlet valve. 2. Press the stop button to halt the motor’s operation. 3. Close the inlet valve, open the exhaust valve, drain all the water from the pump, and then close the exhaust valve. 4. Keep the stopped equipment in good standby condition. V. Precautions 1. Idling is strictly prohibited ； 2. Solid foreign objects inside the device must be completely removed before operation ； 3. The shutdown operation must not last for 1 minute ； 4. Continuous reverse rotation is not allowed ； 5. Do not operate under cavitation conditions ； 6. If abnormal noises or vibrations are detected during operation, it is necessary to promptly identify the cause and take appropriate measures ； 7. Do not operate when the TRG gauge indicates the red area ； 8. When the protection device activates and the cause cannot be identified, operation is prohibited ； 9. The pump must operate within the range of performance parameters specified in the contract; otherwise, it will affect the pump’s axial thrust ； 10. Maximum temperature at the motor inlet: 30℃
Piston pumps are recommended based on operating pressure and flow rate. Due to the uncertainty regarding the specific process conditions, such statements may not be appropriate. The pressure seems to be relatively low, and the required condensation temperature is also low, making it easier to vaporize. Even if there is a certain positioning error during installation, the medium will partially vaporize in summer due to the large temperature difference between it and the atmosphere; using a shielded pump can easily lead to cavitation, so proper insulation is necessary. It is best to use differential pressure self-pressurization filling or gaseous ammonia pressurization filling.
It’s filled using pressure difference self-pressurization; this method isn’t applicable here. I noticed a pressure difference of 4 kilograms before and after filling, which indicates a pressurization process. Also, I’m not clear about what purity the high-purity ammonia in question has – 5N or 6N?
The author of this post is coming back nine years later to read your reply! Actually, your reply is of high quality! I’m realizing it now!
Why didn’t I reply to you back then? Making it up now, 9 years later, is 7N