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bride tournante emboutie dite "bleu point"

English translation: Blue point ??? lap-joint flange

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10:48 May 25, 2009
French to English translations [PRO]
Tech/Engineering - Construction / Civil Engineering / sewage treatment plant
French term or phrase: bride tournante emboutie dite "bleu point"
Still on my sewage treatment plant specification, now discussing assembly accessories:

Assemblages à brides autorisés :
 Brides pleines soudées (GN10) pour les tuyauteries immergées avec boulonnerie inox A4,
 Brides tournantes inox montées sur collet soudé à large portée de joint ou **bride tournantes embouties dites « point bleu » **avec boulonnerie inox A2 70 minimum,
 Bride aluminium revêtue, tournante montée sur collet inox soudé (l’utilisation de brides en aluminium nu, quelque soit la nuance, n’est pas autorisée).

Whilst I've found a translation (Loose plate flange lapped pipe end “blue point”) on the following website:

http://www.larobinetique.fr/pages/inox/p190.html

I'm not at all convinced of the quality of the translation and would appreciate confirmation or a better suggestion!

Many thanks.
Claire Cox
United Kingdom
Local time: 16:58
English translation:Blue point ??? lap-joint flange
Explanation:
It's not the bride tournante that is emboutie but the mechanically formed bride behind which the bride emboutie sits.

Shown here :
http://www.cyber.uhp-nancy.fr/demos/CH-TTFS/chap2/sect-1-4.h...

The equivalent in domestic plumbing is a "collet battu" at the end of a section of copper pipe (formed by FLARING the pipe end, then hammering the flare flat to form a right angle to the pipe) with a bronze fitting (fitted beforehand!!!!).

This is called a "lap joint", giving "lap joint flange" for the loose flange behind it :

LAP JOINT FLARING
1.0 SCOPE
Roll flaring the end of pipe, also known as Van Stone Flanging, is a procedure which allows flanged connections without welding. A loose Lap Joint or modified Slip-on Flange is placed on the pipe prior to flaring. Approximately the last inch of pipe is then roll formed into a ring perpendicular to the pipe axis. This ring, or lap, matches the raised face of a 150# or 300# flange. Flaring is covered by ASME B31.3-93, Par. 306.4.2.
http://www.apexpiping.com/lapjoint.htm

LAP JOINT FLANGES are used on piping fitted with with LAPPED PIPE or with LAP JOINT STUB ENDS. The lap joint flange with the stub end assembly are normally used in systems requiring frequent dismantling for inspection and cleaning and where the ability to SWIVEL FLANGES and to align bolt holes materially eases the erection of large diameter or unusually stiff piping. These flanges are also used in applications where there is a need to facilitate bolt alignment.

These type of flanges are similar to slip-on flanges. The only difference is that it has a curved radius at the bore and face to accommodate a lap joint stub end. They may be used at all pressures and are available in a full size range. These LAP JOINT FLANGES SLIP OVER THE PIPE, AND ARE NOT WELDED. They are otherwise fastened to it. Here the bolting pressure is transferred to the gasket by the pressure of the flange against the back of the pipe lap.
http://www.thepipefittings.com/lap-joint-flanges.html


--------------------------------------------------
Note added at 43 mins (2009-05-25 11:32:00 GMT)
--------------------------------------------------

I take that back: looking at http://www.larobinetique.fr/pages/general/p110.html
I see the lap-joint flange itself is embouti, being "hollow" on one side.

hollow/dished lap-joint flange??
Selected response from:

xxxBourth
Local time: 17:58
Grading comment
Many thanks Alex - your explanations were extremely useful as ever. I checked with client about "point bleu", but they couldn't throw any light on it either, so I've gone with "Blue point" in brackets.
4 KudoZ points were awarded for this answer



Summary of answers provided
3Blue point ??? lap-joint flangexxxBourth


  

Answers


37 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5
Blue point ??? lap-joint flange


Explanation:
It's not the bride tournante that is emboutie but the mechanically formed bride behind which the bride emboutie sits.

Shown here :
http://www.cyber.uhp-nancy.fr/demos/CH-TTFS/chap2/sect-1-4.h...

The equivalent in domestic plumbing is a "collet battu" at the end of a section of copper pipe (formed by FLARING the pipe end, then hammering the flare flat to form a right angle to the pipe) with a bronze fitting (fitted beforehand!!!!).

This is called a "lap joint", giving "lap joint flange" for the loose flange behind it :

LAP JOINT FLARING
1.0 SCOPE
Roll flaring the end of pipe, also known as Van Stone Flanging, is a procedure which allows flanged connections without welding. A loose Lap Joint or modified Slip-on Flange is placed on the pipe prior to flaring. Approximately the last inch of pipe is then roll formed into a ring perpendicular to the pipe axis. This ring, or lap, matches the raised face of a 150# or 300# flange. Flaring is covered by ASME B31.3-93, Par. 306.4.2.
http://www.apexpiping.com/lapjoint.htm

LAP JOINT FLANGES are used on piping fitted with with LAPPED PIPE or with LAP JOINT STUB ENDS. The lap joint flange with the stub end assembly are normally used in systems requiring frequent dismantling for inspection and cleaning and where the ability to SWIVEL FLANGES and to align bolt holes materially eases the erection of large diameter or unusually stiff piping. These flanges are also used in applications where there is a need to facilitate bolt alignment.

These type of flanges are similar to slip-on flanges. The only difference is that it has a curved radius at the bore and face to accommodate a lap joint stub end. They may be used at all pressures and are available in a full size range. These LAP JOINT FLANGES SLIP OVER THE PIPE, AND ARE NOT WELDED. They are otherwise fastened to it. Here the bolting pressure is transferred to the gasket by the pressure of the flange against the back of the pipe lap.
http://www.thepipefittings.com/lap-joint-flanges.html


--------------------------------------------------
Note added at 43 mins (2009-05-25 11:32:00 GMT)
--------------------------------------------------

I take that back: looking at http://www.larobinetique.fr/pages/general/p110.html
I see the lap-joint flange itself is embouti, being "hollow" on one side.

hollow/dished lap-joint flange??

xxxBourth
Local time: 17:58
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 4135
Grading comment
Many thanks Alex - your explanations were extremely useful as ever. I checked with client about "point bleu", but they couldn't throw any light on it either, so I've gone with "Blue point" in brackets.
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