【Daily Question No. 291】October 24, 2018
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【Daily Question No. 291】October 24, 2018: Briefly explain why a cold oil pump cannot be used to pump hot oil The reasons why a cold oil pump cannot handle hot oil are as follows: ① The materials used for the components of a cold oil pump are different from those of a hot oil pump; for example, the impellers of cold oil pumps are usually made of cast iron, while those of hot oil pumps are typically made of cast steel or alloy steel. On the other hand, cast iron parts cannot operate at high temperatures. ②The clearance of the mouth ring in a cold oil pump is small, while in a hot oil pump this clearance is larger due to expansion. If hot oil is pumped using a cold oil pump, the clearance of the mouth ring decreases at high temperatures, which can lead to wear on the impeller and the pump casing. ③The bearing housing, packing box, mechanical seal, and supports of hot oil pumps are equipped with cooling mechanisms that prevent these components from overheating, improve their operating conditions, and ensure that the supports do not experience excessive displacement or deformation. This prevents the pump and motor from running out of alignment. Cold oil pumps lack such mechanisms, and therefore cannot transport hot oil. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
(1) The materials of the components in cold oil pumps and hot oil pumps are different; for example, the impeller of a cold oil pump is made of cast iron, while that of a hot oil pump is made of cast copper or alloy steel, as cast iron components cannot operate at high temperatures. (2) The clearance of the mouth ring in a cold oil pump is small, while in a hot oil pump this clearance is larger due to expansion. If hot oil is pumped using a cold oil pump, the clearance of the mouth ring decreases at high temperatures, which can lead to wear on the impeller and the pump casing. (3) The bearing housing, packing box, mechanical seal, and supports of the hot oil pump all have cooling mechanisms to prevent these components from overheating. It improves the working conditions of the components, while ensuring that the supports do not experience excessive displacement or deformation; this prevents the pump and motor from operating out of alignment. The cold oil pump lacks such mechanisms, and therefore it is unable to transport hot oil.
The reasons why a cold oil pump cannot handle hot oil are as follows: ① The materials used for the components of a cold oil pump are different from those of a hot oil pump; for example, the impellers of cold oil pumps are usually made of cast iron, while those of hot oil pumps are typically made of cast steel or alloy steel. On the other hand, cast iron parts cannot operate at high temperatures. ②The clearance of the mouth ring in a cold oil pump is small, while in a hot oil pump this clearance is larger due to expansion. If hot oil is pumped using a cold oil pump, the clearance of the mouth ring decreases at high temperatures, which can lead to wear on the impeller and the pump casing. ③The bearing housing, packing box, mechanical seal, and supports of hot oil pumps are equipped with cooling mechanisms that prevent these components from overheating, improve their operating conditions, and ensure that the supports do not experience excessive displacement or deformation. This prevents the pump and motor from running out of alignment. Cold oil pumps lack such mechanisms, and therefore cannot transport hot oil.
(1) The materials of the components in cold oil pumps and hot oil pumps are different; for example, the impeller of a cold oil pump is made of cast iron, while that of a hot oil pump is made of cast copper or alloy steel, as cast iron components cannot operate at high temperatures. (2) The clearance of the mouth ring in a cold oil pump is small, while in a hot oil pump this clearance is larger due to expansion. If hot oil is pumped using a cold oil pump, the clearance of the mouth ring decreases at high temperatures, which can lead to wear on the impeller and the pump casing. (3) The bearing housing, packing box, mechanical seal, and supports of the hot oil pump all have cooling mechanisms to prevent these components from overheating. The working conditions of the components are improved, while it is ensured that the supports do not experience excessive displacement or deformation; as a result, the pump and motor do not operate out of alignment. The cold oil pump lacks such mechanisms, and therefore it is unable to transport hot oil
1. The materials used for the components of cold oil pumps and hot oil pumps are different; for example, the pump body and impeller of cold oil pumps are made of cast iron, while those of hot oil pumps are made of cast steel or alloy steel. Cast iron parts cannot operate at high temperatures. 2. If hot oil is pumped using a cold oil pump, the clearance at the outlet ring increases at high temperatures, leading to wear on the impeller and the pump casing. 3. If hot oil is pumped using a cold oil pump, uneven expansion will cause the center of the pump shaft to rise, resulting in misalignment with the motor shaft; this leads to vibration, noise, and wear during operation. 4. If hot oil is pumped using a cold oil pump, the sealing mechanism may be damaged, causing the hot oil to leak out and increasing the risk of fire.
(1) The materials of the components in cold oil pumps and hot oil pumps are different; the impeller of a cold oil pump is made of cast iron, and cast iron components cannot operate at high temperatures. (2) The clearance of the mouth ring in a cold oil pump is small, while in a hot oil pump this clearance is larger due to expansion. If hot oil is pumped using a cold oil pump, the clearance of the mouth ring decreases at high temperatures, which can lead to wear on the impeller and the pump casing. (3) The bearing housing, packing box, mechanical seal gland, and support of the hot oil pump are all equipped with cooling mechanisms, which prevent overheating in these areas, improve the operating conditions of the components, and ensure that the support does not deform excessively. This prevents the pump and motor from running out of alignment. Hot oil pumps lack such mechanisms, and therefore cannot transport hot oil.
The reasons why a cold oil pump cannot handle hot oil are as follows: ① The materials used for the components of a cold oil pump are different from those of a hot oil pump; for example, the impellers of cold oil pumps are usually made of cast iron, while those of hot oil pumps are typically made of cast steel or alloy steel. On the other hand, cast iron parts cannot operate at high temperatures. ②The clearance of the mouth ring in a cold oil pump is small, while in a hot oil pump this clearance is larger due to expansion. If hot oil is pumped using a cold oil pump, the clearance of the mouth ring decreases at high temperatures, which can lead to wear on the impeller and the pump casing. ③The bearing housing, packing box, mechanical seal, and supports of hot oil pumps are equipped with cooling mechanisms that prevent these components from overheating, improve their operating conditions, and ensure that the supports do not experience excessive displacement or deformation. This prevents the pump and motor from running out of alignment. Cold oil pumps lack such mechanisms, and therefore cannot transport hot oil
①The components of cold oil pumps are mostly made of cast iron, which cannot withstand the high temperatures of hot oil. ②The clearance of the ring at the cold oil pump inlet is small; if hot oil is used, the expansion of the ring can cause the pump casing to get stuck or lead to increased wear. ③When heated, the hot oil pump can expand freely in all directions. If a cold oil pump is used with hot oil, uneven expansion can affect the coaxiality of the pump and the motor, resulting in vibration, noise, or wear during operation.
Answer: ① The components of cold oil pumps are mostly made of cast iron, which cannot withstand the high temperatures of hot oil. ②The clearance of the ring at the cold oil pump inlet is small; if hot oil is used, the expansion of the ring can cause the pump casing to get stuck or lead to increased wear. ③When heated, the hot oil pump can expand freely in all directions. If a cold oil pump is used with hot oil, uneven expansion can affect the coaxiality of the pump and the motor, resulting in vibration, noise, or wear during operation.
(1) The materials of the components in cold oil pumps and hot oil pumps are different; for example, the impeller of a cold oil pump is made of cast iron, while that of a hot oil pump is made of cast copper or alloy steel, as cast iron components cannot operate at high temperatures. (2) The clearance of the mouth ring in a cold oil pump is small, while in a hot oil pump this clearance is larger due to expansion. If hot oil is pumped using a cold oil pump, the clearance of the mouth ring decreases at high temperatures, which can lead to wear on the impeller and the pump casing. (3) The bearing housing, packing box, mechanical seal, and supports of the hot oil pump all have cooling mechanisms to prevent these components from overheating. It improves the working conditions of the components, while ensuring that the supports do not experience excessive displacement or deformation; this prevents the pump and motor from operating out of alignment. The cold oil pump lacks such mechanisms, and therefore it is unable to transport hot oil.
(1) The materials of the components in cold oil pumps and hot oil pumps are different; the impeller of a cold oil pump is made of cast iron, and cast iron components cannot operate at high temperatures. (2) The clearance of the mouth ring in a cold oil pump is small, while in a hot oil pump this clearance is larger due to expansion. If hot oil is pumped using a cold oil pump, the clearance of the mouth ring decreases at high temperatures, which can lead to wear on the impeller and the pump casing. (3) The bearing housing, packing box, mechanical seal gland, and support of the hot oil pump are all equipped with cooling mechanisms, which prevent overheating in these areas, improve the operating conditions of the components, and ensure that the support does not deform excessively. This prevents the pump and motor from running out of alignment. Hot oil pumps lack such mechanisms, and therefore cannot transport hot oil.