What does OFF mean here?

I’m not sure if it’s standard practice; it can be understood as “valve off”, that is, using a valve to release the fluid. I prefer this way of expressing it: with a valve for draining at the lowest point. By the way, I’m not sure how drainage at the lowest point inside the heat exchanger is achieved

I think “off” means to disconnect. Valves are provided for isolation at each low-point drain.

Thank you to the two people above; this is from the customer’s specifications. It’s a bit confusing because of the use of “valved off” – it should be “valved”, not “valve”, and there’s also a “off” added in. A drain port is provided at a lower position on the heat exchanger, controlled by a valve.

Basically agree. It can be understood that a drain pipe equipped with a valve in the normally closed position must be installed at the low point.

The “valves in normally closed state” mentioned upstairs revealed the key to the problem; it all became clear suddenly. Thank you so much!

This “off” should correspond to one of the meanings of off gas. Just added a discharge valve at the location, 40 characters

This post was last edited by Saiwai Jiangnan on 2012-6-2 at 10:46. Any internal low point on both the gas and water sides of the exchanger shall be provided with a valved off low point drain.* 1) In terms of process design, “low-point drainage” and “high-point venting” are more common practices; however, the exchanger in question uses a different approach, with both the tube side and the shell side equipped with systems for low-point drainage and low-point venting. This is likely a deliberate design choice based on the specific operating conditions. 2) Here is an explanation of drain: Depending on the context, it refers to the installation of a drain valve and a vent valve in the pipeline used for draining liquid at low points. Therefore, “drain” here should be understood as “vent pipe” and “liquid discharge pipe”. 3) As for “off”, it’s actually not hard to understand; it can be simply translated as “at the low point of the drain/pipe”. If one really wants to get nitpicky, it can be analyzed from the following perspective: First, look at the English definition: “If something is situated off a place such as a coast, room, or road, it is near to it or next to it, but not exactly in it.” For example, “off the coast” can be translated as on the coast/along the shore/not far from the coast. Here, off refers to a certain position on the \"low-point drain pipe/exhaust pipe\", and this position is not fixed at a specific point (otherwise on would be used). 4) From a grammatical perspective, this sentence actually contains a slight grammatical error. Please compare it with the versions I have revised: Original text: Any internal low point on both gas and water side of the exchanger shall be provided with a valved off low point drain.* Revision 1: Any internal low point on each side (including the water and gas sides) of the exchanger shall be provided with a valve for each low point drain.* Revision 2: All internal low points on both the gas and water sides of the exchanger shall be provided with individual valves for the low point drains.* When translating technical documents, it is sufficient to convey the original meaning of the sentence based on an understanding of the relevant technical concepts; there is no need to focus on every single word in the original text. For example, this text does contain grammatical errors in a strict sense, but overall its strengths outweigh its weaknesses, and it remains authentic technical terminology.

Please help me – what is the meaning of the word “off” in the following sentence: \"Any internal low point on both gas and water side of the exchanger shall be provided with a valved off low point drain.\" In my opinion, a valved drain should be provided at the low point. Here it means to isolate it from ... for reference only.

After reading everyone’s explanations, I have a few suggestions: 1. For normally open and normally closed, close and open are generally used. 2. “Valved” is an adjective meaning equipped with a valve; so maybe it should be “of” instead of “off”? A valve-controlled low-level drain point – a discharge point for low liquid levels that is regulated by a valve.

I think \"off\" should be understood as the closed state; if this drain valve is automatically controlled, then \"off\" and \"on\" make good sense as meaning closed and open respectively. Can it be translated as “low-point valve-controlled normally closed drain port”? For reference.