Glossary entry (derived from question below)
English term or phrase:
pre-bleed
English answer:
bleed down to X% of ... prior to biocide dosage
Added to glossary by
Lingo Pros
Jul 25, 2006 06:41
17 yrs ago
6 viewers *
English term
pre-bleed
English
Tech/Engineering
Manufacturing
In a water cooling system.
The context: "The ORP/free chlorine relationship is different for different cooling systems and varies with pH. The ORP set point has to be determined for each cooling system and checked regularly using halogen water tests (DPD)".
There are two timeres, one timer for non-oxidising biocide and one timer for oxidising biocide. Then there is a table for timers settings:
In the 1st column: Timer setting
Pre-blowdown (blowdown
before biocide dosage)
In the 2nd column: Values
Yes/no, conductivity value (pre-bleed when
reading > value) in uS/cm and maximum
duration in #minutes.
What is meant by "pre-bleed when reading>value" here?
The context: "The ORP/free chlorine relationship is different for different cooling systems and varies with pH. The ORP set point has to be determined for each cooling system and checked regularly using halogen water tests (DPD)".
There are two timeres, one timer for non-oxidising biocide and one timer for oxidising biocide. Then there is a table for timers settings:
In the 1st column: Timer setting
Pre-blowdown (blowdown
before biocide dosage)
In the 2nd column: Values
Yes/no, conductivity value (pre-bleed when
reading > value) in uS/cm and maximum
duration in #minutes.
What is meant by "pre-bleed when reading>value" here?
Responses
10 hrs
Lingo Pros
United States
United States
Works in field
United States
More than Words
Native in: Persian (Farsi) 
Works in: Persian (Farsi) to English, Dari to English, Tajik to English, and 4 more.
Related KudoZ points
:
7
Selected
bleed down to X% of ... prior to biocide dosage
Here, pre-bleed should be done if one reads higher than the conuctivity value.
"Pre-bleed" in cooling systems: Where the cooling system is allowed to bleed down to X% of set point conductivity value prior to commenecement of biocide dosage.
http://www.aquariustech.com.au/Tb030_r1.pdf
About bleed and pre-bleed:
http://www.interchem.com.au/Products/Hofmann/Manual/CTH2_man...
These PDFs explain more:
http://www.google.com/search?hl=en&lr=&q="conductivity value...
"Pre-bleed" in cooling systems: Where the cooling system is allowed to bleed down to X% of set point conductivity value prior to commenecement of biocide dosage.
http://www.aquariustech.com.au/Tb030_r1.pdf
About bleed and pre-bleed:
http://www.interchem.com.au/Products/Hofmann/Manual/CTH2_man...
These PDFs explain more:
http://www.google.com/search?hl=en&lr=&q="conductivity value...
4 KudoZ points awarded for this answer.
Comment: "Thank you.
The sites you've provided are very helpful. "
-1
10 mins
David Knowles
Native in English
&
English
Specialist in Civil Law & Contracts
Native in: English
Works in: Russian to English, English, Ukrainian to English
before bleeding (removing air from) the system
"when reading > value" means "when the equipment reading is greater than some fixed value", which indicates that air has got into the system and needs removing.
Peer comment(s):
| neutral |
Harry Borsje
: What is the relevance of air when this refers to the conductivity of the water?
36 mins
|
| disagree |
Tony M
: I think you may be interpreting that backwards, David...
1 hr
|
+1
1 hr
run off some liquid from the system
I think this means that when the reading obtained it HIGHER than the target value, it will be necessary to drain off some of the (presumably old) liquid and then re-test. Since we are talking about CONDUCTIVITY values, a high value would mask the low value that you are looking for (and not vice-versa).
I believe I'm right in saying that adding the chemical to the water will RAISE its conductivity, therefore a HIGH reading could (wrongly, perhaps) indicate TOO MUCH product in the water.
I believe I'm right in saying that adding the chemical to the water will RAISE its conductivity, therefore a HIGH reading could (wrongly, perhaps) indicate TOO MUCH product in the water.
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