claim
---

Pepperl+Fuchs Blog

Ask an Expert! Purge Systems - Episode 3

Posted by Kristen Barbour on Thu, Dec 18, 2014

Need help with an industrial purge system or purged enclosure? Ask an Expert! In this episode, Product Manager Brent Dean answers these questions:

  1. For an ATEX installation using purging, can I use a purge system with a standard IP6X enclosure?
  2. Will I need to have a notified body evaluate the final purge system and enclosure even though your purge system carries the ATEX certification?
  3. I have one of your Type Y purge systems and have a request to install an operator interface in a Class I, Div. 1 location. The operator interface is rated Class I, Div. 2. If I use a Y purge unit, will it be considered applicable for the area, or will there be an issue if the display protrudes through the enclosure?
  4. Can a 6000 series Type X purge system be used in a Class I, Div. 2 environment?
is-barriers-required-resized-600

Transcript

Hello, this is Andy LaMar with Pepperl+Fuchs. This is our latest installment of Ask an Expert, where I sit down with one of our product experts, and they answer questions from our customers. Today I am joined by Brent Dean. Brent is our product engineer for purge systems, explosion protection equipment, and level control. Brent, thanks for joining us. We have a few questions here from our customers, so let's go ahead and get started.

Andy: Ok, for our first question, the customer asks: "For an ATEX installation using purging, may I use your purge system with a standard IP6X enclosure?" Brent, what's the answer?

Brent: Any enclosure can be purged, but enclosures featuring gasketing and multiple door fasteners are best, since they will hold the pressure better. We recommend enclosures that meet or exceed a NEMA rating of Type 4 or Type 12. Using a 6X enclosure is no issue.

Andy: Alright Brent, this customer has a second question, and their question is: "Will I need to have a notified body evaluate the final system even though your system carries the ATEX certification?"

Brent: Yes, you will need to have a notified body evaluate the final system. Our 3000 and 6000 purge systems are ATEX certified, but just adding our certified component to your system does not give you a complete, ATEX-certified solution.

Andy: Thanks, Brent. Now let's move on to our third question. The customer asks: "I have one of your Type Y purge systems and have an application request to install an operator interface in a Class I, Division 1 location. The operator interface is rated Class I, Division 2. If I use a Y purge, will it be considered applicable for the area, or will there be an issue because the display protrudes through the enclosure?" Brent, do you have an answer for them?

Brent: Before we can fully answer this question, we need more information. However, based off the information that we do have, I can make a few speculations. First, let me clarify - a Type Y purge decreases the rating inside an enclosure from a Division 1 to a Division 2 location. Therefore, the portion of the operator interface inside the enclosure has no issue, since it is rated to be located in a Division 2 area. But, part of the user interface will be exposed to the Division 1 location. If the user interface is intrinsically safe, then there will not be an issue with it being exposed. To be sure, you can either contact Pepperl+Fuchs and provide us the model number of the operator interface, and we can verify that for you, or you can call up the manufacturer, and just check and make sure that the operator interface is intrinsically safe so that you can place it in a Division 1 location.

Andy: Alright Brent, this is our last question for this series on purge and pressurization. The customer asks: "Can a 6000 series Type X purge system be used in a Class I, Division 2 environment? I thought it could, but I can't find any information. We only need a Z purge system, but we want all the functionality that comes with the 6000 series X purge system." Alright Brent, so what do we have for them?

Brent: The 6000 series purge system carries a Class I, Division 1 rating. According to the NEC, Article 500.8, equipment that has been identified for a Division 1 location shall be permitted in a Division 2 location of the same Class, Group, and Temperature Class. So let's just say a piece of equipment is rated for a Class I, Division 1 location. It covers gas groups B, C, and D, and it has a temperature rating of T4. Therefore, according to the NEC, there is no issue placing this piece of equipment in a Class I, Division 2 location, as long as the gas groups and the temperature rating also apply. If you tried to place the Division 1 piece of equipment that is rated for gas groups B, C, and D in a Division 2 location where gas group A was present, this is not allowed, since the piece of equipment is not certified for gas group A.

Andy: That concludes this episode of Ask an Expert. Again, I want to thank Brent for joining us, and thanks to everyone who submitted questions. If you have a question, please feel free to give us a call, send us an e-mail, or visit our website. Thanks again!
Questions about Purge Systems? Get the Engineer's Guide

Topics: Purge/ Pressurization Systems, Ask an Expert

Subscribe to Email Updates

Recent Posts

Search our blog!

Loading Google Custom Search.....

Follow Me