Thursday, July 24, 2008

we have eliminated all design flaws in earlier certification


FCG POWER INDUSTRIES P. Ltd. has successfully obtained all new CMRI certification in 1998, 1999 and 2000 - with advantage of eliminating all design flaws in earlier certification. All products follow the latest design philosophy and are TECHNICALLY UPDATED having learnt from feedbacks received from the field experience of the past.


FCG POWER INDUSTRIES P. Ltd. also undertakes development of any import substitution / custom - made / tailor - made items to clients specifications. In house R & D with Computerized Design Cell & Pattern Shop ensures a speedy application oriented development.

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Sunday, May 25, 2008

Group I Ex equipments

Selection & installation of Group I Ex Equipments
Posted by: "B K Gupta" ifmaconsultant@yahoo.com ifmaconsultant
Sun May 25, 2008 4:01 am (PDT)


Dear Members,

IEC does not has any code for selection & installation of Group I ExEquipments unlike 60079-14 for Group II equipments. I have drafted somepoints.

Members are requested to comment & send their inputs.RegardsB K GUPTAEx-PROTECTA/ TECEX Foundationwww.exprotecta. com / <http://www.exprotec ta.com/> www.tecexfoundation.org

DRAFT POINTS------------ --------- --------- --------- --------- --------- -\------------ --------- ----

1.0 PRESENCE OF GASES IN COAL MINESFiredamp is a mixture of naturally occurring flammable gases that formsthe most common potentially explosive gas in mines. It is commonlypredominantly methane and burns or explodes at concentrations between 5%and 15% in air. However, other flammable gases that can occur and mayneed taking into account include:• Mixtures of higher hydrocarbon gases in the vicinity of oilbearing strata;• Hydrogen released during battery charging and by spontaneouscombustion (water gas) – explosive limits are between 4% and 74% byvolume in air;• Carbon Monoxide – explosive limits between 12.5% and 74% byvolume in air.

2.0 AREA CLASSIFICATION:Group II area is divided into zones as per severity of hazard. There isno guideline for such divisions within Group I. However, Indian Standardclassifies coal mines based on rate of emission of gas & percentage offlammable gas in hazardous area formed by gas emission. This guidelinemay be used for zone classification of coal mines as under:SlDegree of MineRate of Gas Emission in M3/ Ton of Coal Produced% of Methane (firedamp) in hazardous areaProposed ZoneRemarks1IUpto 10<=0.112Similar to Zone 2 of Group II2II1 to 10>0.111Similar to Zone 1 of Group II3III>10Not Specified10Similar to Zone 1 or Zone 0 of Group IIThis will facilitate use of Ex equipments other than Flameproof (Ex d) &Intrinsically Safe (Ex i), which are not being presently used as isbeing done in Group II area. This is logical to use equipment havingdifferent level of protection in area based on severity of hazard.It should be appreciated that % of Methane (firedamp) in case of Mine ofDegree I & II is normally much below 1.25%, which is target level forsounding alarm. Even 1.25% is much below LEL of 5% thus these categoriesof mines are quite safe. Degree III mines do call for greater safetymeasures. However, here also necessary action pursuant to sounding ofalarm at 1.25% Methane (firedamp) can supplement safety levels.A consideration also needs to be given to fact that within a particulardegree of mine large areas may not pose even the degree of hazardanticipated at working face, which may be classified as Zone of lowerhazard even within same mine.

This is akin to extent of Zone as in GroupII, where all the Zones are present with geometry defined based onsource of release. In case of Coal Mines working face becomes source ofrelease. This needs very careful consideration due to fact that coalmines are not like fixed installation but working face keeps shifting asper development. At same time this point needs consideration asdeployment cost of equipments will be considerably reduced due to mostjudicious use of Ex equipments of almost all type of Ex protection.

3.0 CATEGORY OF EQUIPMENT:ATEX divides Ex mining equipments in M1 & M2, Category M2 also coversnon electrical equipments. However, exact co-relation of Category M1 &M2 with IEC / EN 60079 Series of code is not clear in HSE Guidelines.IEC 60079-0 divides Group II equipments as IIA, IIB & IIC for Ex d & Exi based on degree of hazard. Methane (firedamp) is having IgnitionTemperature of 595ËšC thus even T1 Class equipment are suitable forGroup I. This code also considers hazard from coal dust in addition tomethane (firedamp) and accordingly temperature classification T1 is nomore applicable to Group I but maximum surface temperature has beenspecified as under:1. 150ËšC on any surface where coal dust can form a layer.2. 450ËšC where coal dust is not expected to form a layer.This can become a logical ground for subdivision of Group I Exequipments based on difference in hazard/ safety level. We can thussubdivide Ex equipments for Group I as IA & IB to signify IA asequipments on which coal dust is not expected to form a layer and IB assuch equipments on which dust can form a layer.

4.0 MONITORING OF HAZARDOUS AREA:Indian Standard prescribes monitoring of methane (Limit - 1.25%) &Carbon Monoxide (Max 5ppm) to sound an audio visual alarm. Furthercourse of action may be specified.Under ATEX directive Equipment of Category M2 is required to bede-energized at 1.25 % methane concentration. However, Category M1equipments are allowed to work.

5.0 SELECTION OF Ex EQUIPMENTS:Based on proposed Zones:Proposed ZoneCoal dust is not expected to form layer on equipmentCoal dust can form layer on equipment* Following Type of protection as individual or combination of two ormore to be allowed10Ex * I AEx * I Bd & i11Ex * I AEx * I Bd, i, e, p, m, q12Ex * I AEx * I Bd, i, e, p, m, q, n

Visit Your Group on the Web

Wednesday, January 16, 2008

Monday, January 14, 2008

ISO/IEC 60097-1 : 2007

The revised standard released

The changes:

Tuesday, January 8, 2008

Control Valves

go here

TECHNICAL Info

go here

Explosions, Fires and Accidents Resulting from Leakage of Liquefied Petroleum Gas

10.1 (LPG)

10.1.1 In view of the considerable use on smaller cargo ships, fishing vessels, tugs, barges, launches and pleasure craft of bottled hydrocarbon gases for cooking, water and space heating, refrigerators, etc., the MCA wishes to draw attention to the possible dangers which may accompany their use and to the need for installations to comply at least with the requirements of British Standard Institution publication BS 5482: Part 3: 1979—The code of practice for domestic butane and propane gas-burning installations; Part 3—Installations in boats, yachts and other vessels.

Individual appliances and fittings should comply with the relevant British Standard Specifications listed in BS 5482: Part 3: 1979.

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Wednesday, January 2, 2008

FCG POWER PRODUCTS

Products
Product List Light Fittings Control Station Junction Box Switches Control Panel Telephone Cable Gland Accessories
Light Fittings

Control Station
Junction Box
Switches
Socket
Control Panel
Telephone
Cable Gland
Accessories

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Tuesday, January 1, 2008

Petroleum and Explosives Safety Organisation (PESO

Authority and Responsibilities of Petroleum and Explosives Safety Organisation (PESO)

other expert reports

OCRed document
every flameproof cable gland needs to be. inspected (after installation) by a registered. expert. This registered expert is normally ...ieeexplore.ieee.org/iel3/1240/489/00009533.pdf?arnumber=9533 - Similar pages

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Newsletter
File Format: PDF/Adobe Acrobat - View as HTML‘Flameproof Enclosures’,. Certification. •. Secretary CENELEC/TC31. “Electrical Apparatus for explosive. atmospheres”. •. expert IEC/MT 7 ‘Flameproof ...www.iecex.com/newsletter/021204_IECEx_%20Newsletter_02_02-rev-21.pdf - Similar pages

Mining Science and Technology '99: Proceedings of the '99 ... - Google Books Result
by Heping Xie, Tad S. Golosinski - 1999 - Technology As shown in Figure 6, the flameproof portable computer with an expert system communicates with each monitoring system substation in underground longwall ...books.google.com/books?isbn=9058090671...

JUNCTION BOXES
Expert in CNC Dies, Jigs, Fixtures, Precision Components, ... Flame Proof Light Fitting, Flame Proof Equipments, Flame Proof Switchgears, Flame Proof ...www.maharashtradirectory.com/SearchResult.asp?ProductID=1756 - 139k - Cached - Similar pages


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Environmental Expert Gold & Silver Sponsorships Now Available! ... RS232 analogue auto control pumps; 521DF/RLA close-coupled flameproof fixed speed pumps ...www.environmental-expert.com/STSE_resulteach_product.aspx?cid=2193&idprofile=37&idproduct=1072 - 74k - Cached - Similar pages


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File Format: PDF/Adobe Acrobat - View as HTMLIndian Pump Manufacturers' Association. Shri C.S. Kasana,. Alternate ..... Indian Flameproof Mfrs. Association. Shri Nandakumar K. Principal ...www.bis.org.in/sf/competd.pdf - Similar pages -


UMARGAM INDUSTRIES ASSOCIATION
World chemical directory with chemical manufacturers, ... Products:, Electric Hoist,EOT Cranes,Good Lifts,Speciality Flame Proof Hoist. ...www.uiassociation.org/cgi-bin/via/search.cgi?query=Engineering&nh=8 - 136k - Cached - Similar pages -

are Exd products really safe?

Standards: Explosion Proof...Is It Really?


Instrument engineers are responsible for providing safe and appropriate instrumentation. To declare a system safe, simply because a single component is approved, is dangerous in more ways than one.

Two important factors should be considered whenever a job involves electrical equipment in a hazardous location:
1.) Safety. Is the equipment specified truly safe to use in the proposed environment? If the answer is yes, then on what premise is that answer based?

2.) Liability. If you have determined that the equipment specified is safe, are you prepared to defend that determination in a court room?

No one wants to be responsible for injuring others, especially when easily obtainable safeguards exist. In the event of an unfortunate incident, the consequences can be punitive if the injured party can prove that the designer did not take all reasonable and prudent measures to protect against predicable hazards.

In the event of an accident involving an explosion in a hazardous environment, the attorneys for the injured party will attempt to prove negligence on the designer's part. To do this, they usually will retain some individual or organization recognized as an expert in the field.

The designer might be asked what measures were taken to ensure that the equipment was safe. Then, their expert would attempt to point out items missed or not listed under direct examination.

In the United States, Factory Mutual Research Corp. (FMRC) is recognized as one of the experts in the field of industrial safety. For certain installations, many companies, local governments and regulatory agencies require that all electrical equipment must be approved by FM, Underwriters Laboratories (UL), and the Canadian Standards Association (CSA).

In general, these rules and regulations spell out the location's category by class, division and group. (See Definitions) When an installation requires that electrical-measuring instruments be placed in locations that are considered hazardous, it is incumbent upon the engineer to see that the installation is safe.

The user generally will specify the degree of safety required. For example, a petrochemical company could specify that supplied equipment must be explosion proof for Class I, Division 1, Group B.

The user is being very specific as to the level of security expected, referring to Article 500 of the National Electrical Code. Factory Mutual subscribes to this code and references it in their approval guide.In general, the classification defines the extent of the hazard, taking into account the energy required to ignite certain gas mixtures and the potential forces released as a result.

When an assembly is called explosion proof, the sensor assembly manufacturer is certifying to the user that specific steps have been taken to ensure the safety of all Plant personnel. But, no chain is stronger than its weakest link; likewise, no system is explosion proof if it contains non-explosion proof components.

Systems are rendered explosion proof by two means:

Design the system so that it cannot release sufficient electrical or thermal energy to ignite the specified gas mixture. Such systems are classified as intrinsically safe.

Design the system such that it is capable of containing an internal explosion of a specified flammable vapor air mixture and may contain sufficiently long thread paths such that any escaping gases will be cooled below the ignition temperature of the surrounding atmosphere.

Installing a temperature sensor in a hazardous location requires more than an approved explosion proof connection head. To meet the safety requirements of FM and CSA, you must consider the complete system: including the sensor, the thermowell (if required and used) and the connection head.

Each component in the system must meet the code. For example, many thermowells are supplied with 1/2-14 NPSM threads for the sensor connection. FM/CSA dictates that to meet the requirements for explosion proof, a tapered thread is required.

Most sensors are supplied with a 1/2-14 NPT thread; however, FM/CSA also specifies a minimum thread engagement between the sensor and the connection head. The thread engagement requirement makes it necessary to overcut the thermowell thread beyond the ASME definition of 1/2-14 NPT.

Those manufacturers wishing to offer explosion proof assemblies must meet FM/CSA's requirements. Once a design is constructed with the proper thread size and engagement between the head cover, head body, wire conduit and seal, sensor, lag fittings and thermowell, the manufacturer submits the design to FM/CSA for testing to ensure that the specified gas mixtures are properly contained.

Once approved by FM/CSA, the manufacturer is not permitted to alter any of the approved configurations without FM/CSA approval. If changes are necessary, FM/CSA may require additional testing before approving any changes. In addition, FM/CSA performs periodic unannounced inspections of the manufacturer's plant to ensure that the assemblies are constructed in accordance with the approved drawings.

With explosion proof assemblies, it is truly a case of ?you get what you pay for?. Using unapproved sensors or thermowells with an approved, explosion proof connection head, for example, will not provide the protection you need for your plant and personel.

Failure to consider the entire system, or failure to utilize the knowledge and resources of recognized experts in this critical area, is at best risky, and at worst dangerous and irresponsible.

To review this and more articles on temperature control please visit: www.rdfcorp.com
Posted by Admin on Friday, February 24, 2006 (1204 Reads)

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