【Weekly Question】Closed 2010-11-11 Practical Simulation for Pump Selection (II)
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This post was last edited by lxn_663 on 2010-11-19 16:22. Technical specifications for the amine solution circulation pump: 1. Basic requirements: Transport medium: 47% (m) MDEA, 3% (m) DEA, 50% water, along with trace amounts of gases such as H2S and CO2. Flow rate: 5–9 m3/h Density: 1018 kg/m3 Viscosity: 1.8 cP Temperature: 65–80°C Transfer pressure: 20 kPa at the pump inlet, 6300 kPa at the pump outlet and at the tower inlet ； Note: Tower height: 15 m2. Other requirements: 2.1 The pump’s flow rate is adjustable, with a minimum flow rate of 5 m3/h and a maximum of 10 m3/h ； 2.2 The material of the pump body shall meet the requirements for media with trace amounts of sulfur, and the motor shall be explosion-proof ； 2.3 Since the pump needs to be installed on an integrated skid, it is required to have a small size and produce no vibration ； Response requirements: 1. The type of pump; manufacturers can be recommended. Various types of pumps can be used for this purpose, and the most suitable one according to personal opinion can be suggested. 2. Materials of various pump components, 3. Pump speed, shaft power, 4. Power of the motor used, 5. Other suggestions; please hide the answers if posting in this forum.
This post was last edited by lxn_663 on 2010-11-19 at 16:19:1. 1. Pump in accordance with API 610, version 10; high-speed pump, with OH6 design type. The manufacturer recommends Sundyne as the supplier. 2. The material used is API610 S-8; due to the presence of hydrogen sulfide, it is necessary to eliminate weld stresses. 3. No samples are available, so I have calculated based on 18,000 revolutions per minute. The shaft material should be austenitic 316 stainless steel as required by S-8 standards. 4. The efficiency is set at 30%; the shaft power is 59 kW, while the motor power is 75 kW. Since speed control is required, an inverter-driven motor is used.
This post was last edited by FLYTOINTER on 2010-11-12 at 14:16. These are the answers from the previous session; I have some comments on one of them. 1. Pump type: Gear pump. 2. Materials of various pump components: Pump body – 304; Impeller – 304; Pump shaft – Alloy steel. 3. Pump speed and shaft power: 1450 revolutions per minute, 13.5 KW. 4. The motor required has a power of 15 KW, while the shaft power is 13.5 KW; a 15 KW motor is somewhat insufficient for this application. According to API676, when the shaft power is less than 22 KW, a 25% margin is required, so 18.5 KW is necessary.
This post was last edited by lxn_663 on 2010-11-19 at 16:20: 1. A screw pump is to be used; 2. The impeller, rotor, stator, and pump shaft are all made of stainless steel 304; 3. The shaft power is 2.8 KW with a rotation speed of 2900 r/min; 4. A 4KW motor will suffice
This post was last edited by lxn_663 on 2010-11-19 at 16:20. I made a mistake in calculating the shaft power; my apologies. It should be 22.8 KW, so a 30 KW unit will suffice
This post was last edited and replied to by lxn_663 on 2010-11-19 at 16:21. 1# lxn_663: So many questions
I really want to know what it is. Do I have to reply to find out the answer?
The correct answer hasn’t been announced yet. When will the third issue come out?
Reply to 8# FLYTOINTER: There is no single correct answer regarding the actual simulation-based selection of pumps, as many different pumps can meet these operating conditions; the aim is simply to encourage more people to get involved. The topics for phase three should be released as soon as possible. Thank you for the guidance.
Reply to 9# lxn_663: Theoretically, many types of pumps can meet these requirements. However, considering costs, reliability, and economic factors, I believe not many pumps are capable of fulfilling these demands. Even in theory, the pumps that can meet these requirements are high-speed pumps, multi-stage centrifugal pumps, and high-pressure piston pumps (as opposed to tubular pumps). I haven’t calculated the NPSHa value; given that the inlet pressure is relatively low, I assume the NPSHa isn’t high. Vertical pumps have a clear advantage when dealing with low net positive suction head values. Meanwhile, high-speed pumps offer better reliability compared to multi-stage pumps, while the advantage of multi-stage pumps lies in their lower cost. As for high-pressure reciprocating pumps, such high pressures aren’t necessary in this case. I’ve heard that submersible pumps are also used in similar applications, but in very small numbers; few owners or engineering companies are willing to take that risk. There are several similar pumps in the Sichuan refining and hydrogenation project, and SEI chose high-speed pumps for all of them. Multi-stage pumps are also widely used in such applications.