Iec 60239 2005

INTERNATIONALE IECINTERNATIONAL STANDARD 60239 Quatrième éditionFourth edition2005-06 Electrodes en graphite pour les fours à arc – Dimensions et dénomination Graphite electrodes for e

Description du produit

Figure 1 illustrates a graphite arc furnace electrode with its connector in position, ready for assembly into an electrode column The electrodes can be transported as shown in Figure 1, either with the connectors already installed in the sockets or with the connectors packaged separately.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU.

3.9 slope angle between the thread pitch line and axis of thread

NOTE The slope angle is half of the taper angle It can be referenced by using the actual angle or its tangent

The pitch diameter of the pin is defined as the diameter of the circle formed at the intersection of a plane, which is perpendicular to the pin's axis at its midpoint, with the cone that encompasses the pitch lines of the pin threads.

NOTE See d 2 in Figures 3 and 4

The major diameter of the pin refers to the diameter of the circle formed at the intersection of a plane, which is perpendicular to the pin's axis, at the midpoint of the pin's length This diameter is defined by the cone created by the lines connecting the crests of the pin threads.

3.12 nominal diameter of the pin major diameter of the pin truncated to zero decimal place

The pitch diameter of the socket refers to the diameter of the circle formed at the intersection of a plane, which is perpendicular to the axis of the socket, and the cone that includes the pitch lines of the socket thread This diameter aligns with the extremity of the electrode cylinder.

The minor diameter of the socket is defined as the diameter of the circle formed at the intersection of a plane perpendicular to the socket's axis and the extremity of the electrode cylinder This diameter corresponds to the cone that connects the crest of the socket thread.

3.15 low spot part of the cylinder untouched by the tool when machining the electrode

Figure 1 illustrates a graphite arc furnace electrode with its pin securely in position, prepared for assembly into an electrode column The electrodes can be shipped either with the pins already installed in the sockets, as depicted in Figure 1, or with the pins packaged separately.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. d l

Légende d diamètre de l’électrode l longueur de l’électrode

La Figure 2 représente une colonne d’électrode, après assemblage Généralement, 3 ou 4 électrodes de four à arc en graphite peuvent être assemblées afin de former une colonne d’électrode

Diamètres des électrodes

Les longueurs nominales des électrodes pour un diamètre nominal donné sont données au

Tableau 1, ainsi que les spécifications pour les diamètres réels Les électrodes doivent être usinées pour obtenir le diamètre spécifié sur toute leur longueur

Key d electrode diameter l electrode length

Figure 2 shows an electrode column, after assembly Usually, 3 or 4 graphite arc furnace electrodes may be assembled to form an electrode column

Table 1 provides the nominal electrode lengths corresponding to specific diameters, along with the specifications for actual diameters It is essential that electrodes are machined to achieve the specified diameter consistently along the entire length.

Tableau 1 – Diamètres et longueurs nominales des électrodes

Spécifications sur le diamètre réel Diamètre nominal d

A low point can only be accepted if the diameter measured at that point does not exceed 3 mm below the specified minimum diameter.

Des spécifications différentes peuvent faire l’objet d’un accord entre le fournisseur et l’utilisateur.

Longueurs des électrodes

Les longueurs des électrodes (sans raccord) doivent satisfaire aux spécifications établies au

Spécifications sur la longueur réelle pour les électrodes normales l

Spécifications sur la longueur réelle pour les électrodes courtes Longueur l nominale

Maximum Minimum Maximum Minimum mm

Il convient que le pourcentage admissible d'électrodes courtes par livraison soit défini par accord entre le fournisseur et l'utilisateur

Des spécifications différentes sur la longueur peuvent faire l’objet d’un accord entre le fournisseur et l’utilisateur

Table 1 – Diameters and nominal lengths of electrodes

Actual diameter specifications Nominal diameter d

A low spot (see 3.15) may be accepted only if the diameter measured at the low spot is not more than 3 mm below the minimum diameter specification

Different specifications may be agreed upon between the supplier and user

The lengths of the electrodes (without pin) shall meet specifications set in Table 2

Actual length specifications for normal electrodes l

Actual length specifications for short electrodes Nominal length l

The acceptable percentage of short electrodes per delivery should be decided by agreement between the supplier and user

Different length specifications may be agreed upon between the supplier and user

Dimensions des logements

La tangente conique du logement doit être de 1/3 (la tangente de la pente doit être de 1/6)

Deux types de logements filetés peuvent être utilisés:

• un logement fileté avec 4 filets par pouce (25,4 mm) pour les électrodes d’un diamètre nominal de 75 mm à 750 mm, désigné T4;

• un logement fileté avec 3 filets par pouce (25,4 mm) pour les électrodes d’un diamètre nominal de 225 mm à 550 mm, désigné T3

For T4 housing, two different depths can be utilized for electrodes with a nominal diameter ranging from 350 mm to 700 mm: standard housing and long housing, which correspond to two distinct connection lengths.

For T3 housing, two different depths can be utilized for electrodes with a nominal diameter ranging from 350 mm to 500 mm: standard housing and extended housing, which correspond to two different connection lengths.

Pour le type T4, les logements des électrodes doivent satisfaire aux dimensions présentées à la Figure 3 et au Tableau 3

The socket taper tangent shall be 1/3 (the slope tangent shall be 1/6)

Two types of threaded sockets can be used:

• those with 4 threads per inch (25,4 mm), (T4) for electrodes of nominal diameter from

Two different socket depths can be used for T4 sockets of electrodes of nominal diameter from

350 mm to 700 mm: normal sockets and long sockets related to two different pin lengths

350 mm to 500 mm: normal sockets and long sockets, related to two different pin lengths

For type T4, the sockets of electrodes shall meet dimensions shown in Figure 3 and Table 3

Figure 3 – Logement et raccord, type T4

Figure 3 – Socket and pin, type T4

Tableau 3 – Dimensions des raccords et des logements des électrodes (type T4)

Diamètre nominal de l’électrode d 4 d 1 l 1 l 2 l 3 mm

Dénomination de la jonction mm

Le diamètre primitif du raccord d 2 est égal au diamètre primitif du logement d 4

Le petit diamètre du logement d 3 est égal au diamètre primitif d 4 moins 3,16 mm

D’autres combinaisons de diamètre nominal et de jonction doivent faire l’objet d’un accord entre le fournisseur et l’utilisateur a La jonction 406T4N permet une longueur de raccord optionnelle de 584,20 mm

Table 3 – Dimensions of pins and sockets of electrodes (type T4)

Nominal diameter of electrode d 4 d 1 l 1 l 2 l 3 mm

Pin pitch diameter d 2 is equal to socket pitch diameter d 4

Socket minor diameter d 3 is equal to pitch diameter d 4 minus 3,16 mm

Other combinations of nominal diameter and joint are to be agreed upon between the supplier and user a The 406T4N joint permits an optional pin length of 584,20 mm

Axe central du filetage Conicité

Diamètre nominal de l’électrode mm

D’autres combinaisons de diamètre nominal et de jonction doivent faire l’objet d’un accord entre le fournisseur et l’utilisateur.

Dénomination

Housing must be designated by the nominal diameter of the appropriate fittings, the letter "T" for tapered threads, the number of threads per inch (25.4 mm), and the letters "N" or "L" for normal or long housing, respectively.

EXEMPLE 1 Dénomination des logements normaux: logement 317T4N logement 273T3N

EXEMPLE 2 Dénomination d’un logement long: logement 317T4L

4.5.2 Les électrodes doivent être désignées par le diamètre nominal, la longueur nominale et la dénomination du logement

EXEMPLE 1 Dénomination des électrodes avec un logement normal:

EXEMPLE 2 Dénomination d’une électrode avec un logement long:

Different electrode assembly systems, referred to as "male-female electrodes," are utilized in certain countries, distinct from those defined in this standard It is important that they receive a specific designation, as outlined in Annex A.

Nominal diameter of electrode mm

Other combinations of nominal diameter and joint are to be agreed upon between the supplier and user

4.5.1 Sockets shall be designated by the nominal diameter of the appropriate pins, the letter

"T" for taper thread, the number of threads per inch (25,4 mm) and the letter "N" or "L" for normal or long socket, respectively

EXAMPLE 1 Designation of normal sockets:

EXAMPLE 2 Designation of a long socket:

4.5.2 Electrodes shall be designated by the nominal diameter, the nominal length and the socket designation

EXAMPLE 1 Designation of electrodes with normal socket:

EXAMPLE 2 Designation of an electrode with long socket:

4.5.3 Connection systems for electrodes other than specified in this standard, called “male- female electrodes”, are used in some countries They should have a different designation, as shown in Annex A

Dimensions

La tangente conique du raccord doit être de 1/3 (la tangente de la pente doit être de 1/6)

Les raccords, en fonction du grand diamètre nominal de l’électrode correspondante, doivent satisfaire aux dimensions présentées à la Figure 3 et au Tableau 3, pour les raccords avec

4 filets par pouce (25,4 mm) (type T4)

Deux longueurs de raccords appelées normale et longue peuvent être utilisées avec les logements correspondants, comme décrit en 4.4.

Dénomination

Fittings should be designated by the nominal diameter, the letter "T" for tapered threads, the number of threads per inch (25.4 mm), and the letters "N" or "L" for normal or long fittings, respectively.

EXEMPLE 1 Dénomination des raccords normaux: raccord 317T4N raccord 273T3N

EXEMPLE 2 Dénomination d’un raccord long: raccord 317T4L

Détails sur la conception des raccords non normalisés

Les fentes, visant à retirer la poussière au cours de la jonction, peuvent être usinées le long de la ligne de pas du raccord

Users may require cylindrical holes to be machined in the fitting and filled with cement, typically pitch, to prevent any potential unscrewing of the fitting during use.

6 Tolérances pour les logements et les raccords

Tolérances pour les dimensions des logements et des raccords

Les dimensions des logements et des raccords doivent satisfaire aux tolérances données au

Tableau 5 (pour les filetages T4) et au Tableau 6 (pour les filetages T3)

The pin taper tangent shall be 1/3 (the slope tangent shall be 1/6)

The pins, depending on the nominal major diameter of the corresponding electrode, shall meet dimensions shown in Figure 3 and Table 3, for pins with 4 threads per inch (25,4 mm)

Two lengths of pins called normal and long can be used along with corresponding sockets as described in 4.4

Pins are identified by their nominal diameter, the letter "T" indicating a taper thread, the number of threads per inch (25.4 mm), and the letters "N" or "L" to denote normal or long pins, respectively.

EXAMPLE 1 Designation of normal pins:

EXAMPLE 2 Designation of a long pin:

5.3 Non-standard pin design details

Slots, aimed at removing dust during jointing, may be machined along the pitch line of the pin

Users may require that cylindrical holes be machined in the pin and filled with cement, typically pitch, which ought to prevent possible unscrewing of pin during utilization

6 Tolerances for sockets and pins

6.1 Tolerances for socket and pin dimensions

Socket and pin dimensions shall meet tolerances as given in Table 5 (for T4 threads) and

Tableau 5 – Tolérances pour les logements et les raccords (type T4)

Tolérances pour les logements et les raccords

(les tolérances entre parenthèses sont données uniquement à titre informatif)

Ces tolérances devraient assurer la compatibilité entre les fournisseurs, bien que le mélange de différentes sources d’électrodes ne soit pas recommandé, comme indiqué à l’Article 1.

Exigences spécifiques sur les tolérances pour les zones filetées des

A complete set of tolerances for threaded areas of housings and fittings cannot be specified in this standard Manufacturers must adjust their own dimensions for housings and fittings, considering the thermal properties of the fitting and electrode material, as well as the operational conditions of the arc furnace.

Cela doit être réalisé tout en maintenant l’intégrité mécanique adéquate de la jonction à basse température

Table 5 – Tolerances for sockets and pins (type T4)

Tolerances for sockets and pins

(tolerances in brackets are informative only)

These tolerances ought to ensure compatibility between suppliers, although mixing of different sources of electrodes is not recommended, as stated in Clause 1

6.2 Specific requirements on tolerances for socket and pin threaded area

The standard does not provide a complete set of tolerances for socket and pin threaded areas Manufacturers must customize their socket and pin dimensions, considering the thermal properties of the pin and electrode materials, along with the operating conditions of the arc furnace It is essential to ensure the mechanical integrity of the joint is maintained at low temperatures.

To ensure compatibility among suppliers, the following requirements must be met: a) At each position along the axis of the fitting, the size of the fitting must be less than or equal to the dimensions specified in Table 3 and Table 4, as illustrated.

Figures 3 and 4 illustrate that the nominal diameter \(d_2\) of the fitting should typically range from -1.00 mm to 0.00 mm relative to the nominal diameter specified in Tables 3 and 4 Additionally, at every position along the housing axis, the housing size must be equal to or greater than the dimensions outlined in Tables 3 and 4.

Figures 3 and 4 indicate that the housing's nominal diameter should typically range from 0.00 mm to +0.50 mm in relation to the nominal diameter specified in Tables 3 and 4.

Description of product

Figure 1 illustrates a graphite arc furnace electrode with its pin securely in position, prepared for assembly into an electrode column The electrodes can be delivered either with the pins already inserted into the sockets, as depicted in Figure 1, or with the pins packaged separately.

Légende d diamètre de l’électrode l longueur de l’électrode

La Figure 2 représente une colonne d’électrode, après assemblage Généralement, 3 ou 4 électrodes de four à arc en graphite peuvent être assemblées afin de former une colonne d’électrode

Les longueurs nominales des électrodes pour un diamètre nominal donné sont données au

Tableau 1, ainsi que les spécifications pour les diamètres réels Les électrodes doivent être usinées pour obtenir le diamètre spécifié sur toute leur longueur

Key d electrode diameter l electrode length

Figure 2 shows an electrode column, after assembly Usually, 3 or 4 graphite arc furnace electrodes may be assembled to form an electrode column

Diameters of electrodes

Table 1 provides the nominal electrode lengths corresponding to specific nominal diameters, along with the specifications for actual diameters It is essential that electrodes are machined to achieve the specified diameter consistently throughout their entire length.

Tableau 1 – Diamètres et longueurs nominales des électrodes

Spécifications sur le diamètre réel Diamètre nominal d

A low point can only be accepted if the diameter measured at that point does not exceed 3 mm below the specified minimum diameter.

Des spécifications différentes peuvent faire l’objet d’un accord entre le fournisseur et l’utilisateur

Les longueurs des électrodes (sans raccord) doivent satisfaire aux spécifications établies au

Spécifications sur la longueur réelle pour les électrodes normales l

Spécifications sur la longueur réelle pour les électrodes courtes Longueur l nominale

Il convient que le pourcentage admissible d'électrodes courtes par livraison soit défini par accord entre le fournisseur et l'utilisateur

Des spécifications différentes sur la longueur peuvent faire l’objet d’un accord entre le fournisseur et l’utilisateur

Table 1 – Diameters and nominal lengths of electrodes

Actual diameter specifications Nominal diameter d

A low spot (see 3.15) may be accepted only if the diameter measured at the low spot is not more than 3 mm below the minimum diameter specification

Different specifications may be agreed upon between the supplier and user.

Lengths of electrodes

The lengths of the electrodes (without pin) shall meet specifications set in Table 2

Actual length specifications for normal electrodes l

Actual length specifications for short electrodes Nominal length l

The acceptable percentage of short electrodes per delivery should be decided by agreement between the supplier and user

Different length specifications may be agreed upon between the supplier and user

La tangente conique du logement doit être de 1/3 (la tangente de la pente doit être de 1/6)

Deux types de logements filetés peuvent être utilisés:

• un logement fileté avec 4 filets par pouce (25,4 mm) pour les électrodes d’un diamètre nominal de 75 mm à 750 mm, désigné T4;

• un logement fileté avec 3 filets par pouce (25,4 mm) pour les électrodes d’un diamètre nominal de 225 mm à 550 mm, désigné T3

For T4 housing, two different depths can be utilized for electrodes with a nominal diameter ranging from 350 mm to 700 mm: standard housing and extended housing, which correspond to two different connection lengths.

For T3 housing, two different depths can be used for electrodes with a nominal diameter ranging from 350 mm to 500 mm: standard housing and extended housing, which correspond to two different connection lengths.

Dimensions of sockets

The socket taper tangent shall be 1/3 (the slope tangent shall be 1/6)

Two types of threaded sockets can be used:

350 mm to 700 mm: normal sockets and long sockets related to two different pin lengths

350 mm to 500 mm: normal sockets and long sockets, related to two different pin lengths

Diamètre nominal de l’électrode d 4 d 1 l 1 l 2 l 3 mm

D’autres combinaisons de diamètre nominal et de jonction doivent faire l’objet d’un accord entre le fournisseur et l’utilisateur a La jonction 406T4N permet une longueur de raccord optionnelle de 584,20 mm

Nominal diameter of electrode d 4 d 1 l 1 l 2 l 3 mm

Other combinations of nominal diameter and joint are to be agreed upon between the supplier and user a The 406T4N joint permits an optional pin length of 584,20 mm

Axe central du filetage Conicité

Diamètre nominal de l’électrode mm

D’autres combinaisons de diamètre nominal et de jonction doivent faire l’objet d’un accord entre le fournisseur et l’utilisateur

Housing must be designated by the nominal diameter of the appropriate fittings, the letter "T" for tapered threads, the number of threads per inch (25.4 mm), and the letters "N" or "L" for normal or long housing, respectively.

EXEMPLE 1 Dénomination des logements normaux: logement 317T4N logement 273T3N

EXEMPLE 2 Dénomination d’un logement long: logement 317T4L

4.5.2 Les électrodes doivent être désignées par le diamètre nominal, la longueur nominale et la dénomination du logement

EXEMPLE 1 Dénomination des électrodes avec un logement normal:

EXEMPLE 2 Dénomination d’une électrode avec un logement long:

Different electrode assembly systems, referred to as "male-female electrodes," are utilized in certain countries, distinct from those defined in this standard It is important that they receive a specific designation, as outlined in Annex A.

Nominal diameter of electrode mm

Other combinations of nominal diameter and joint are to be agreed upon between the supplier and user.

Designation

4.5.1 Sockets shall be designated by the nominal diameter of the appropriate pins, the letter

"T" for taper thread, the number of threads per inch (25,4 mm) and the letter "N" or "L" for normal or long socket, respectively

EXAMPLE 1 Designation of normal sockets:

EXAMPLE 2 Designation of a long socket:

4.5.2 Electrodes shall be designated by the nominal diameter, the nominal length and the socket designation

EXAMPLE 1 Designation of electrodes with normal socket:

EXAMPLE 2 Designation of an electrode with long socket:

4.5.3 Connection systems for electrodes other than specified in this standard, called “male- female electrodes”, are used in some countries They should have a different designation, as shown in Annex A

La tangente conique du raccord doit être de 1/3 (la tangente de la pente doit être de 1/6)

Deux longueurs de raccords appelées normale et longue peuvent être utilisées avec les logements correspondants, comme décrit en 4.4

Fittings should be designated by the nominal diameter, the letter "T" for tapered threads, the number of threads per inch (25.4 mm), and the letters "N" or "L" for normal or long fittings, respectively.

EXEMPLE 1 Dénomination des raccords normaux: raccord 317T4N raccord 273T3N

EXEMPLE 2 Dénomination d’un raccord long: raccord 317T4L

5.3 Détails sur la conception des raccords non normalisés

Les fentes, visant à retirer la poussière au cours de la jonction, peuvent être usinées le long de la ligne de pas du raccord

Users may require cylindrical holes to be machined in the fitting and filled with cement, typically pitch, to prevent any potential unscrewing of the fitting during use.

6 Tolérances pour les logements et les raccords

6.1 Tolérances pour les dimensions des logements et des raccords

Les dimensions des logements et des raccords doivent satisfaire aux tolérances données au

Tableau 5 (pour les filetages T4) et au Tableau 6 (pour les filetages T3)

The pin taper tangent shall be 1/3 (the slope tangent shall be 1/6)

Two lengths of pins called normal and long can be used along with corresponding sockets as described in 4.4.

Designation

Pins are identified by their nominal diameter, the letter "T" indicating taper thread, the number of threads per inch (25.4 mm), and the letters "N" or "L" to denote normal or long pins, respectively.

EXAMPLE 1 Designation of normal pins:

EXAMPLE 2 Designation of a long pin:

Non-standard pin design details

Slots, aimed at removing dust during jointing, may be machined along the pitch line of the pin

Users may require that cylindrical holes be machined in the pin and filled with cement, typically pitch, which ought to prevent possible unscrewing of pin during utilization

6 Tolerances for sockets and pins

Tolerances for socket and pin dimensions

Socket and pin dimensions shall meet tolerances as given in Table 5 (for T4 threads) and

Ces tolérances devraient assurer la compatibilité entre les fournisseurs, bien que le mélange de différentes sources d’électrodes ne soit pas recommandé, comme indiqué à l’Article 1

6.2 Exigences spécifiques sur les tolérances pour les zones filetées des logements et des raccords

A complete set of tolerances for threaded areas of housings and fittings cannot be specified in this standard Manufacturers must adjust their own dimensions for housings and fittings, considering the thermal properties of the fitting and electrode material, as well as the operational conditions of the arc furnace.

Cela doit être réalisé tout en maintenant l’intégrité mécanique adéquate de la jonction à basse température

These tolerances ought to ensure compatibility between suppliers, although mixing of different sources of electrodes is not recommended, as stated in Clause 1.

Specific requirements on tolerances for socket and pin threaded area

The standard does not provide a complete set of tolerances for socket and pin threaded areas Manufacturers must customize their socket and pin dimensions, considering the thermal properties of the pin and electrode materials, along with the operating conditions of the arc furnace It is essential to ensure the mechanical integrity of the joint is maintained at low temperatures.

To ensure compatibility among suppliers, the following requirements must be met: a) At each position along the connection axis, the size of the fitting must be less than or equal to the dimensions specified in Tables 3 and 4, as illustrated.

Figures 3 and 4 indicate that the nominal diameter \(d_2\) of the fitting should typically range from -1.00 mm to 0.00 mm relative to the nominal diameter specified in Tables 3 and 4 Additionally, at every position along the housing axis, the housing size must be greater than or equal to the dimensions outlined in Tables 3 and 4.

Figures 3 and 4 illustrate that the housing's nominal diameter should generally range from 0.00 mm to +0.50 mm in relation to the nominal diameter specified in Tables 3 and 4.

6.3 Exigences spécifiques sur les tolérances pour les zones non filetées des logements et des raccords

Les exigences suivantes concernent essentiellement les problèmes d’interférence entre la petite extrémité du raccord et la base du logement

Any unthreaded section of the housing must have a diameter larger than the line connecting the peaks of the threads if it extends into the unthreaded area.

Any unthreaded section of the fitting must have a diameter smaller than the line connecting the bottoms of the threads of the fitting if it extends into the unthreaded area.

To ensure supplier compatibility, it is essential that the pin size at every point along its axis is equal to or smaller than the dimensions specified in Table 3 and Table 4, as illustrated in Figure 3 and Figure 4.

The pitch diameter \( d_2 \) of the pin must be maintained within a range of -1.00 mm to 0.00 mm from the specified pitch diameter in Tables 3 and 4 Additionally, the socket size at any point along its axis should be equal to or exceed the dimensions outlined in Tables 3 and 4, as illustrated in Figure 3.

Figure 4 Typically, pitch diameter of the socket should be within 0,00 mm to +0,50 mm from the pitch diameter defined in Table 3 and Table 4.

Specific requirements on tolerances for socket and pin unthreaded area

The following requirements address essentially interference issues between the small end of the pin and the base of the socket

6.3.1 Any unthreaded part of the socket shall be larger in diameter than the line connecting the crests of the socket threads, if extended over the non-threaded area

6.3.2 Any unthreaded part of the pin shall be smaller in diameter than the line connecting the roots of the pin threads, if extended over the non-threaded area

Recent techniques have led to the use of male-female shaped electrodes as arc furnace electrodes in certain countries Due to their limited distribution, the dimensions are not standardized and are only provided for informational purposes in this appendix.

La présente annexe porte sur les dimensions et détails de filetage des deux extrémités des électrodes mâles-femelles, électrodes utilisées sans raccords

Il convient que la longueur des électrodes mâles-femelles soit définie comme la longueur du cylindre non fileté complètement tourné, comme représenté à la Figure A.1, à la Figure A.2 et à la Figure A.3

Il convient que le Tableau 1 et le Tableau 2 de la présente norme soient utilisés comme spécification pour le diamètre et la longueur des électrodes mâles-femelles

Il convient que les électrodes mâles-femelles soient désignées par le diamètre nominal, la longueur nominale, le symbole MF suivi de 3, 4 ou 8 suivant le nombre de filets par pouce

EXEMPLE Dénomination des électrodes mâles-femelles:

Trois types de filetages peuvent être utilisés:

• un filetage avec 3 filets par pouce (25,4 mm) pour les électrodes d’un diamètre nominal de

Il convient que les détails des filetages des électrodes mâles-femelles en graphite suivent les dimensions indiquées au Tableau A.1 (pour MF3), au Tableau A.2 (pour MF4) et au

Tableau A.3 (pour MF8) Les schémas correspondants sont présentés à la Figure A.1, à la

Figure A.2 et à la Figure A.3, respectivement

Recent advancements have introduced male-female design electrodes for arc furnaces in certain countries Although their application is limited, the dimensions of these electrodes are provided in this annex for reference.

This annex covers the dimensions and thread details for both ends of male-female electrodes, that is electrodes used without pins

Length of male-female electrodes should be defined as the length of the unthreaded full turned cylinder as shown in Figure A.1, Figure A.2 and Figure A.3

Table 1 and Table 2 of this standard should be used as specification for diameter and length of male-female electrodes

Male-female electrodes should be designated by the nominal diameter, the nominal length, the symbol MF and 3, 4 or 8 for number of threads per inch (25,4 mm)

EXAMPLE Designation of male-female electrodes:

Three types of threads may be used:

• those with 3 threads per inch (25,4 mm) (MF3) for electrodes of nominal diameter from

The thread details of male-female graphite electrodes should follow dimensions shown in Table

A.1 (for MF3), Table A.2 (for MF4) and Table A.3 (for MF8) Corresponding drawings are in

Figure A.1, Figure A.2 and Figure A.3, respectively

Figure A.1 – Electrode mâle-femelle, type MF3

Tableau A.1 – Dimensions des électrodes mâles-femelles de diamètres de 300 mm à 400 mm (type MF3)

Longueur filetée de l’électrode mâle l 2

Diamètre primitif de l’extrémité de l’électrode mâle d 1

Longueur filetée de l’électrode femelle l 4

Diamètre primitif de l’extrémité de l’électrode femelle d 2 mm

Figure A.1 – Male-female electrode, type MF3

Table A.1 – Dimensions of male-female electrodes of diameters from 300 mm to 400 mm (type MF3)

Female end pitch diameter d 2 mm

Longueur filetée de l’électrode mâle l 2

Longueur filetée de l’électrode femelle l 4

Diamètre primitif de l’extrémité de l’électrode femelle d 2 mm

Female end pitch diameter d 2 mm

Diamètre primitif de l’extrémité de l’électrode femelle d 2

Diamètre maximal de l’outil d 3 mm

Nominal diameter Male end pitch diameter d 1

Manipulation et jonction des électrodes

To ensure a proper connection between electrodes and an appropriate contact between threads, as well as a suitable contact on the end face, operators of arc furnaces must implement several crucial practices These practices are essential for optimizing the use of electrodes and preventing safety issues related to handling a column with poorly tightened joints.

B.2 Préparation d’une nouvelle électrode pour ajout

The upper housing of the new electrode will later be part of a junction and requires special attention It is essential to maintain protection until the lifting plug needs to be inserted, ensure that the housing and end faces are clean and undamaged, use only a clean and undamaged lifting plug, and carefully insert the lifting plug into the housing.

When raising the electrode from a horizontal to a vertical position, keep the connector protection in place or use a cushioning material beneath the connector to prevent damage to the threads.

Nettoyer le logement et les faces d’extrémité de l’ancienne colonne, ainsi que ceux de la nouvelle électrode avec de l’air

Dans le cas ó des saletés devraient être retirées manuellement, utiliser une brosse douce sur les filetages Il est recommandé de ne pas utiliser une brosse métallique

Dans la mesure ó diverses techniques de jonction sont utilisées, seules quelques vérifications importantes peuvent être données comme partie de la présente annexe:

• il convient que la technique de jonction empêche tout endommagement des filetages dû à des chocs;

• il convient qu’un couple approprié soit utilisé, selon les recommandations de chaque fournisseur

To ensure optimal electrode-to-electrode connections and secure thread-to-thread and end face contacts, arc furnace operators must implement essential practices These measures are crucial for maximizing electrode efficiency and preventing safety hazards linked to handling columns with inadequately tightened joints.

B.2 Preparation of new electrode for addition

To ensure the integrity of the new electrode's top socket, which will be integrated into a joint, it is essential to follow these precautions: maintain protection until the lift plug is ready to be inserted, verify that both the socket and end faces are clean and undamaged, utilize only a clean and undamaged lift plug, and carefully insert the lift plug into the socket.

When raising the electrode from horizontal to vertical position, leave the pin protection in place or alternatively place a cushioning material underneath the pin to prevent damage to the threads

Clean the socket and end faces of the old column as well as of the new electrode with air

In the case where some dirt should be removed manually, use a soft brush against the threads

Use of a metallic brush should be avoided

As various jointing techniques are in use, only a “critical few” check list can be given as part of this annex:

• jointing technique should avoid any thread damage occurring from shocks;

• appropriate torque should be used, as per each supplier’s recommendation

B.5 Pratiques de fixation (pince d’électrode)

Il convient que les pratiques de fixation suivantes soient évitées:

− effectuer la fixation sur des logements ôouvertsằ (risques d’endommagement du logement);

− laisser une jonction au-dessus de la pince d’électrode (risques de desserrage/dévissage de la jonction);

It is essential to secure the connection in the junction area to avoid damaging the housing and the fixation on two electrodes with slightly different diameters The supplier should clearly mark the junction area with painted lines on the larger diameter, indicating the position of the housing base.

The following clamping practices should be avoided:

− clamping on “open” sockets (risk of damage to the socket);

− leaving a joint above the electrode clamp (risk of loosening/unscrewing of the joint);

Clamping in the joint area poses a risk of damaging the socket and can lead to clamping on two electrodes with slightly different diameters To mitigate this issue, the supplier should clearly mark the joint area with paint lines on the major diameter, indicating the location of the socket's base.

_ FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU LICENSED TO MECON Limited - RANCHI/BANGALORE

The IEC is committed to providing the highest quality standards and values your feedback to ensure we meet your needs Please take a moment to answer the questions on the following page and send them to us via fax at +41 22 919 03 00 or by mail to the address provided below Thank you for your participation!

Fax to: IEC/CSC at +41 22 919 03 00

Thank you for your contribution to the standards-making process.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. number of the standard: (e.g 60601-1-1)

Q2 Please tell us in what capacity(ies) you bought the standard (tick all that apply).

I am the/a: purchasing agent R librarian R researcher R design engineer R safety engineer R testing engineer R marketing specialist R other

(tick all that apply) manufacturing R consultant R government R test/certification facility R public utility R education R military R other

Q4 This standard will be used for:

(tick all that apply) general reference R product research R product design/development R specifications R tenders R quality assessment R certification R technical documentation R thesis R manufacturing R other

Q5 This standard meets my needs:

(tick one) not at all R nearly R fairly well R exactly R standard is out of date R standard is incomplete R standard is too academic R standard is too superficial R title is misleading R

I made the wrong choice R other

Q7 Please assess the standard in the following categories, using the numbers:

(6) not applicable timeliness quality of writing technical contents logic of arrangement of contents tables, charts, graphs, figures other

Q8 I read/use the: (tick one)

English text only R both English and French texts R

Q9 Please share any comment on any aspect of the IEC that you would like us to know:

The CEI aims to provide you with the highest possible standards To ensure we continue to meet your expectations, we kindly request some information from you Please take a moment to complete the questionnaire below and return it to us by fax at.

+41 22 919 03 00 ou par courrier à l’adresse ci-dessous Merci !

Centre du Service Clientèle (CSC)

Nous vous remercions de la contribution que vous voudrez bien apporter ainsi à la Normalisation Internationale.

Centre du Service Clientèle (CSC)

Q2 En tant qu’acheteur de cette norme, quelle est votre fonction?

(cochez tout ce qui convient)

Je suis le/un: agent d’un service d’achat R bibliothécaire R chercheur R ingénieur concepteur R ingénieur sécurité R ingénieur d’essais R spécialiste en marketing R autre(s)

(cochez tout ce qui convient) dans l’industrie R comme consultant R pour un gouvernement R pour un organisme d’essais/ certification R dans un service public R dans l’enseignement R comme militaire R autre(s)

Q4 Cette norme sera utilisée pour/comme

This article serves as a comprehensive reference for product research, product development studies, specifications, submissions, quality assessments, certifications, technical documentation, theses, manufacturing, and other related areas The effectiveness of these processes can vary, ranging from not at all to perfectly executed.

Q6 Si vous avez répondu PAS DU TOUT à

Q5, c’est pour la/les raison(s) suivantes:

The standard requires revision due to its incompleteness and overly theoretical nature Additionally, it is perceived as superficial, and the title may be misleading There may also be concerns about making the right choice regarding its application.

Q7 Veuillez évaluer chacun des critères ci- dessous en utilisant les chiffres

(2) au-dessous de la moyenne,

(4) au-dessus de la moyenne,

(6) sans objet publication en temps opportun qualité de la rédaction contenu technique disposition logique du contenu tableaux, diagrammes, graphiques, figures autre(s)

Q8 Je lis/utilise: (une seule réponse) uniquement le texte franỗais R uniquement le texte anglais R les textes anglais et franỗais R

Q9 Veuillez nous faire part de vos observations éventuelles sur la CEI:

Tiêu đề	Graphite Electrodes for Electric Arc Furnaces – Dimensions and Designation
Trường học	International Electrotechnical Commission
Chuyên ngành	Electrical Engineering
Thể loại	Standards Document
Năm xuất bản	2005

Định dạng
Số trang	54
Dung lượng	1,23 MB