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Participant

Join Date: Nov 2017
Posts: 2

Fence Requirement For The Oil-Filled Power Transformers

11/26/2017 11:49 PM

Hello

as per the standard, Oil-filled power transformers which are installed outdoors shall be located in a fenced-in area .

My Qs is for a process plant ( Oil Gathering station , Refinery, etc ) where security fence is been provided and access control is in place

.Is it mandatory to install a fence for the transformer (11/.415 KV 2MVA Oil-filled power hermetically seal transformers) located within the process plant ?

Is there any potential safety concern which required to be fenced ?

To be noted , number of LV and HV equipments ( DB’s , elec heaters , Motors ) located within the plant and it’s not fenced

please need your view .

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#1

Re: fence requirement for the Oil-filled power transformers

11/27/2017 12:12 AM

Do you not trust the standard that you do not identify?

Why would you ask strangers when you, apparently, have the standard to hand?

Either follow it or ignore it.

Maybe there are no insurers, inspectors, investors or other interested parties who might have an opinion about this. I doubt it.

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Power-User

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#2

Re: fence requirement for the Oil-filled power transformers

11/27/2017 1:33 AM

Oil filled transformer is a fire hazard when energised. Hence, you shouldn't near the transformer when it is live.

The additional fence exclusively for the transformer area is to remind people of this requirement.

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#3

Re: fence requirement for the Oil-filled power transformers

11/27/2017 5:19 AM

CR4 is getting a lot of these of late.

Q1) "I have a standard. Do I have to follow it?"

A1) No. But there are consequences:

  • If the standard is mandated by the Client in the contract documentation and it is not followed and a concession is not granted beforehand, then there will be commercial implications for the Contractor in terms of the costs of re-work and Client's compensation for delays following non-acceptance of the installation during Acceptance Testing, notwithstanding any damage to the Contractor's reputation that such deviation may cause.
  • From a liability aspect, in most jurisdictions any incident that causes a loss that is either commercial or criminal, any deviation from the standard transfers liability away from the facility's insurers, towards the Deviant.
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#9
In reply to #3

Re: fence requirement for the Oil-filled power transformers

11/28/2017 1:16 AM

That is unfair. The OP is not asking for permission to deviate from the standard. Instead he is asking for the "true" meaning of the standard, which is quite legitimate.

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#12
In reply to #9

Re: fence requirement for the Oil-filled power transformers

11/30/2017 1:18 AM

The OP is asking both actually. And both questions are being covered here.

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#4

Re: fence requirement for the Oil-filled power transformers

11/27/2017 5:37 AM

To answer this, one would need to see the actual full wording of the standard.

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Participant

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#5

Re: fence requirement for the Oil-filled power transformers

11/27/2017 6:37 AM

I appreciate you all for your prompt response .

I can see The discussion went to a different direction. To be noted any deviation from the standard will follow the proper process with the approved authority prior to implementation.

In my query I don’t discuss the process , I am looking for your view in this particular case & will take into consideration any safety aspects and whatever implication from cost and schedule cost to the project .

What is the current design in your process facilities .

Thanks

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#6
In reply to #5

Re: fence requirement for the Oil-filled power transformers

11/27/2017 6:41 AM

It could be that the standard to hand does not apply to facilities elsewhere. Among the possibilities for non-applicability are:

  • the standard is a national one and the facilities are in another country in which the standard has not been adopted
  • the standard was established and applied after the facilities were constructed; regulatory standards are not retrospective
  • there are no facilities about to be constructed at the facility where the standard could possibly be applied

<...view...>

Here it is:

  • Follow the standard to hand, and all will be well.
  • Deviate, and expect a $h!tstorm.

OK?

<unsubscribes>

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#7

Re: Fence Requirement For The Oil-Filled Power Transformers

11/27/2017 4:18 PM

Keep this in mind when you approach a forum with too little information in hand. Engineering by consensus/Google/handbook is a sure route to disaster since only those people who sign the final document will have any responsibility for the accuracy of the answers that you receive.

Having worked for a major international Process Plant AEC (Architect/Engineer/Construction) design/build firm, I can assure you that what might be allowed in one location, might be totally rejected in another. Either follow the standards and practices of the location in question, or work directly with the AHJ (Authority Having Jurisdiction) if you wish to deviate from them.

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#8

Re: Fence Requirement For The Oil-Filled Power Transformers

11/28/2017 1:09 AM

what standard are you following and what authority are you consulting with/reporting to?

The standard will tell you what to do the authority will tell you if it is acceptable.

As already stated.. follow what you have in hand, take on board what the authority tells you and all will be fine and dandy.
If you don't expect the worse to the power of 100

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#10

Re: Fence Requirement For The Oil-Filled Power Transformers

11/28/2017 4:58 AM

According to NEC 2014 110.28 Guarding of Live Parts (A) Live Parts Guarded Against Accidental Contact. you have to provide a fence in order to prevent persons are not likely to come into accidental contact with the live parts or to bring conducting objects into contact with them.See art.110.31 for more information.

You also have to provide means to avoid fire hazard according NEC 2014 Art.450.27 Oil-Insulated Transformers Installed Outdoors.

If it is about process plant ( Oil Gathering station , Refinery, etc ) then API regulation has to be conducted.

On power generation stations design, we follow the NFPA 850 Recommendations.

NFPA 850/2013 5.1.4 Outdoor Oil-Insulated Transformers

For instance Table 5.1.4.3 Outdoor Oil-Insulated Transformer Separation Criteria:

Transformer Oil Capacity: less than 500 gal 5ft

500 to 5000 gal 25 ft

more than 5000 gal 50 ft

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#11

Re: Fence Requirement For The Oil-Filled Power Transformers

11/29/2017 12:46 AM

No, it is not mandatory but good practice to keep it in a bunded and demarcated area with the required signs displayed. Especially in a plant where there is a lot of traffic and people. You do not want the transformer bumped or used as a storage area.

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#13

Re: Fence Requirement For The Oil-Filled Power Transformers

12/01/2017 3:56 PM
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