HAZARDOUS AREA CLASSIFICATION

[pristava]

GAS PIPELINE LOCATED CLOSE TO THE FENCE IS MAKING CLASSIFIED AREA - DIVISION 2 OUTSIDE OF THE PROPERTY, OUTSIDE OF THE FENCE.
AREA AROUND THE FENCE IS PROVIDED FOR THE TEMPORARY ROAD - FOR MAINTENANCE.
THE FENCE CAN NOT BE EXTENDED - BECAUSE IS NOT THE SAME PROPERTY.
HOW TO CREATE SAFE AREA? CREATING OF NO-PASSING ZONE WITH A SIGNS IS PROBABLY NOT ENOUGH ?

 

[1969grad]

What is the source causing the area classification?

Suggest you review API 500 and perhaps get an out.

 

[MortenA]

Pristava: The question is; if its just a pipe you wont get any areaclassification since there are no point where gas can escape. If there are vents or other sources it might be different.

Best regards

Morten

 

[jcaiken]

Check the latest version of the standards as many have been revised recently. For example IP-15(2002) specified that the hazardous area round a flange on a natural gas pipe may be only 1.5m and therefore half the 3m recommended in the previous IP-15(1990) code.

 

[LSThill]

jcaiken (Chemical)

Please give more detail and reference on IP-15(2002) , IP-15(1990) code.

Leonard

 

[jcaiken]

From memory IP-15 (1990) sized the hazardous area round flanges etc as 1.5m or 3m depending on the quality of the installation and frequence of handling. IP-15 (2002)uses a more quantified criterion based on a release size and frequency relationship and a release rate & area based on the fluid and the source pressure (up to 100 barg). For Natural Gas the maximum Zone 2 area is 1m radius but for liquid releases this could be 2.5m, or 3m if close to the ground.
I'd strongly recommend that you get hold of a copy from the Energy Institute (formerly Institute of Petroleum) as a detailed assessment based on the location of potential release sources (flanges, valves, etc.) could be the answer.
Note that a 3rd edition of IP-15 is in preparation and could be released soon.

 

[jcfoley]

Pristava,
You mentioned this being a gas line (Natural Gas?). In the US, this will probably fall under ASME B1.8 or DOT CFR 149 or both. I would check this and follow 1969grad's advise on checking API RP500.

Chris

 

[jcfoley]

Okay,

So much for not being able to type. That should have been ASME B31.8

Chris