9 replies to this topic

[mykid]

Hi i am currently working on a proposal. The client specifies the need of cartridge filter downstream of fine filter in the water injection system. May i know what is the purpose of the cartridge filter? The injection water specification has 50NMP/ml bacteria and total anaerobic bacteria : 5000 NMP/ml. Is this related to the requirement of cartridge filter?

Typically fine filter can remove 98% of particles size with 2 microns and above.

Thanks.

[Jiten_process]

hi mykid

i can just throw some lights on it. We are providing the cartiridge filter for our plants but that is for steam application. Generally speaking cartridge is a media of filteration, there is mainly two types of cartridge filter used 1) sintered cartridge 2) pleated cartridge. Better filteration w.r.t. area is i think very important feature. In that too, pleated are more better than sintered but costlier. And they are available upto 2microne and even finer.

I dont know the type and the purpose of the fine filter you are talking about, but generally cartridge filters are used for sanitary/hygenic application where the fluid is directly being injected to some food product or so.

I have not come across the relation between bacteria content and all with cartridge...
may above info. would be informative to u.

Hi i am currently working on a proposal. The client specifies the need of cartridge filter downstream of fine filter in the water injection system. May i know what is the purpose of the cartridge filter? The injection water specification has 50NMP/ml bacteria and total anaerobic bacteria : 5000 NMP/ml. Is this related to the requirement of cartridge filter?

Typically fine filter can remove 98% of particles size with 2 microns and above.

Thanks.

[JoeWong]

Provision Coarse filter follow by fine filter on water injection line common to bring the particle size and particle concentration to acceptable level (off hand can not recall the figures...your figures looks correct).

I guess the cartridge filter do nothing during normal operation but as safeguard device in the event the fine filter element collapse and passing.

Hope you can check and confirm my understanding.

[Jiten_process]

One thing; is your client asking the same mesh size cartridge filter which you are providing already?

Generally typcial practice different sizes of filters in series to avoid high loading to single filter. Typeically by providing single finest filter would trap particle size ranging max. to min. which prone to chock very soon. and also lead to high pressure drop.

In our application we are providing cartridge filter of higher mesh size followed by smaller mesh size.

Hope this might have added something you are looking for....

[JoeWong]

One thing; is your client asking the same mesh size cartridge filter which you are providing already?

Generally typcial practice different sizes of filters in series to avoid high loading to single filter. Typeically by providing single finest filter would trap particle size ranging max. to min. which prone to chock very soon. and also lead to high pressure drop.

In our application we are providing cartridge filter of higher mesh size followed by smaller mesh size.

Hope this might have added something you are looking for....

Your response is a bit confuse...

Are saying that you have coarse filter, follow by fine filter, then high mesh size cartridge filter and last last mesh size cartridge filter... ? If the last 2 x cartridge filter will do nothing during normal operation...

Have you confirm my understanding "cartridge filter do nothing during normal operation but as safeguard device in the event the fine filter element collapse and passing." with you client ?

Awaiting your response.

[Jiten_process]

[/quote]
"Are saying that you have coarse filter, follow by fine filter, then high mesh size cartridge filter and last last mesh size cartridge filter... ? If the last 2 x cartridge filter will do nothing during normal operation..."

hi,

Let me try to make myself more clear, in our application we have steam which we need to enject directly to one food product. Being hygenic application we need to filter it. We are providing two sintered/pleated cartridge filter in series first one is 75micron followed by 5micron.

Now imagine if i provide only one filter of 5micron. particle raning from more than 75micron upto 5microne will be filtered by only one filter and will be chocked very soon or will give high pressure drop across single filter. Also size of that filter will have to be kept too high for such high loading rate. So particles size more than 75micron will be filtered by first filter and below that will be filtered by 5micron filter. This is what the logic.

Second thing, if i provide only one filter, all the particle will be filtered by one filter only. But then why should i have to spend more money for those particle which actually do not need fine filtering. For example, for particles size more than 75micron. will need filteration only upto 75micron, they do not need filtering through 5micron mesh size. So by providing two filters in series with two different size will cost me less than if i provide single filter of 5microne size for that same total loading rate.

what is your comment on it??

"Have you confirm my understanding "cartridge filter do nothing during normal operation but as safeguard device in the event the fine filter element collapse and passing." with you client ?"

I am bit disagree with this saying. It depends on what mesh size of cartrige filter you are using. In my case both the filter are acting their role. If we provide same mesh size filter in series, i would say it is just for safeguard in a case when first one fails? But neways fails has no logic. As soon as first filter give PD wihtin acceptable limit, it is ok! in case PD increases above unit, it will have to taken out for cleaning. So there is no use of putting two same mesh size filter in series. And that is why i asked to MYKID, whether his client is asking the same mesh size cartridge filter which he has already considered?

I hope i made myself a bit more cleare with this reply...
Awaiting your further comments on it....


[/quote]

[JoeWong]

Jiten_process,

We are inline...I am completely understand and agree with you on this point.

After reading through the post completely, now i am completely understand.
You are talking about two cartridge filters in series and normal CLEAN water filtration application.

On the other hand, the sentence "...need of cartridge filter downstream of fine filter in the water injection system..." has lead me to PRODUCED or SEAWATER WATER filtration in offshore water injection application.

Normally in offshore water injection package, there are coarse filter follow by a fine filter.They do exact the same per your explanation.

From the sentence "...need of cartridge filter downstream of fine filter in the water injection system...", i understood it provide another cartridge filter downstream of fine filter.

However, the second statement "Typically fine filter can remove 98% of particles size with 2 microns and above.". Downstream of fine filter already have above stringent quality (which is pretty close to the offshore water injection specification. I really doubt a cartridge filter with the finest hole would be able to meet above mentioned specification (hope someone can confirm my unconfirm statement). Those, i said it is normally do nothing but as safeguard in case of fine filter failed.




MYKID,
Please advise your application and feedback on this interesting discussion.

[Jiten_process]

Jiten_process,

From the sentence "...need of cartridge filter downstream of fine filter in the water injection system...", i understood it provide another cartridge filter downstream of fine filter.

However, the second statement "Typically fine filter can remove 98% of particles size with 2 microns and above.". Downstream of fine filter already have above stringent quality (which is pretty close to the offshore water injection specification. I really doubt a cartridge filter with the finest hole would be able to meet above mentioned specification (hope someone can confirm my unconfirm statement). Those, i said it is normally do nothing but as safeguard in case of fine filter failed.

MYKID,
Please advise your application and feedback on this interesting discussion.

hi joewong

i feel cartridge filter now a days becoming widely used filteration media. I really do not have a idea of offshore water injection system, but as far as filter is concern i would say cartridge filter can filter particles as small as 2micron effectively, and further as i said in my earlier post too, PLEATED type cartridge filter are the most efficient filter but they are bit expensive. High filteration area is something very good feature of pleated type cartridge filter.

Hope mykid must have got his answer too, through this fruitful and intresting discussion. right?

to be continued....

[mykid]

Thanks all for the feedbackk. Actualy the client prefers to use cartridge filter in place of fine filters. However to reduce the change out frequency of the cartridge filter, a fine filter can be installed upstream. SO basically the two are doing the same jobs =).

[JoeWong]

It looks reasonable to me...