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English to French translations [PRO]
Tech/Engineering - Engineering (general) / Health and safety | | English term or phrase: blanking/blinding | | Isolation means “the process by which a permit space is removed from service and completely protected against the release of energy and material into the space by such means as: blanking/blinding; misaligning or removing sections of lines |
| | | utilisation de plaques d'obturation / de volets | Explanation:
Interesting didcussion of the concept here:
"Check ASTM F 1020 regarding Line-Blind Valves. The following definitions may help.
A blank or what I called a blind is a solid one-piece circular unit inserted into a pipeline to prevent flow.
A line-blind valve—an assembly consisting of a spectacle
plate, bolting, and body, the purpose of which is to provide a convenient means to align a piping system to an open or positively closed configuration. The assembly is designed to provide a simplified method of changing over the flow control spectacle plate without the necessity of plate removal from the valve body.
A spectacle plate or spectacle blind is a figure-eight shaped unit wite"
h one end open for flow and the other solid to prevent flow.
The term "positive" means absolutely no flow such as might occur with slight valve leakage"
"I have to agree with the issue of entering confined space. DBB are not adequate for safety as stated above by others.
jte (Mechanical)
5 May 05 20:57
Well, I'll have to disagree with the idea that a DBB is not adequate. I don't like statements like "OSHA doesn't recognize double-block-and-bleed as adequate isolation for work in a confined space." unless they are supported by "and here's the quote from the law which says so."
So... from 29 CFR 1910.146 available at http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_tabl...
"Isolation" means the process by which a permit space is removed from service and completely protected against the release of energy and material into the space by such means as: blanking or blinding; misaligning or removing sections of lines, pipes, or ducts; a double block and bleed system; lockout or tagout of all sources of energy; or blocking or disconnecting all mechanical linkages
"Double block and bleed" means the closure of a line, duct, or pipe by closing and locking or tagging two in-line valves and by opening and locking or tagging a drain or vent valve in the line between the two closed valves.
So Federal OHSA does recognize DBB as one means of isolating a permit space. It does not state a preference for isolation schemes; as far as isolation is concerned, a DBB is equal to a blind. Having said that, I would prefer that a vessel which I enter is isolated by line misalignment or blinding, but I will not refuse to enter a vessel which is isolated via a DBB scheme. Of course, company policies and states may have stricter guidelines. For example, California recognizes DBB as adequate, but places a preference on disaligning and blinding over DBB and has additional requirements for using a DBB approach."
http://www.eng-tips.com/viewthread.cfm?qid=122807 |
| Selected response from:
 FX Fraipont
Belgium
Local time: 11:53
| Grading comment | 4 KudoZ points were awarded for this answer |
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4 mins confidence:  
5 mins confidence: obturation (colmatage)
Explanation:
Dictionary - Definition of plugging - 02:09 - [ Traduire cette page ]
Français, colmatage (clogging, plugging, blinding, silting, aggradation), ... botting), obturation (sealing, stopping, plugging, obturation, blanking), ...
www.websters-online-dictionary.net/definitions/Plugging - En cache
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24 mins confidence: utilisation de plaques d'obturation / de volets
Explanation:
Interesting didcussion of the concept here:
"Check ASTM F 1020 regarding Line-Blind Valves. The following definitions may help.
A blank or what I called a blind is a solid one-piece circular unit inserted into a pipeline to prevent flow.
A line-blind valve—an assembly consisting of a spectacle
plate, bolting, and body, the purpose of which is to provide a convenient means to align a piping system to an open or positively closed configuration. The assembly is designed to provide a simplified method of changing over the flow control spectacle plate without the necessity of plate removal from the valve body.
A spectacle plate or spectacle blind is a figure-eight shaped unit wite"
h one end open for flow and the other solid to prevent flow.
The term "positive" means absolutely no flow such as might occur with slight valve leakage"
"I have to agree with the issue of entering confined space. DBB are not adequate for safety as stated above by others.
jte (Mechanical)
5 May 05 20:57
Well, I'll have to disagree with the idea that a DBB is not adequate. I don't like statements like "OSHA doesn't recognize double-block-and-bleed as adequate isolation for work in a confined space." unless they are supported by "and here's the quote from the law which says so."
So... from 29 CFR 1910.146 available at http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_tabl...
"Isolation" means the process by which a permit space is removed from service and completely protected against the release of energy and material into the space by such means as: blanking or blinding; misaligning or removing sections of lines, pipes, or ducts; a double block and bleed system; lockout or tagout of all sources of energy; or blocking or disconnecting all mechanical linkages
"Double block and bleed" means the closure of a line, duct, or pipe by closing and locking or tagging two in-line valves and by opening and locking or tagging a drain or vent valve in the line between the two closed valves.
So Federal OHSA does recognize DBB as one means of isolating a permit space. It does not state a preference for isolation schemes; as far as isolation is concerned, a DBB is equal to a blind. Having said that, I would prefer that a vessel which I enter is isolated by line misalignment or blinding, but I will not refuse to enter a vessel which is isolated via a DBB scheme. Of course, company policies and states may have stricter guidelines. For example, California recognizes DBB as adequate, but places a preference on disaligning and blinding over DBB and has additional requirements for using a DBB approach."
http://www.eng-tips.com/viewthread.cfm?qid=122807
| FX Fraipont
Belgium
Local time: 11:53
Works in field
Native speaker of:  French
PRO pts in category: 979
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| Changes made by editors |
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| Dec 14, 2010 - Changes made by FX Fraipont: | | Created KOG entry | KudoZ term => KOG term |
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