4 replies to this topic

[arkae]

hi everyone,

 

i need some help regarding the air drain trap of air receiver.

 

In our project we have two air receivers, one at the outlet of air compressor and the other at the outlet of air dryer.

The capacity of compressor is 840 nm3/hr and discharge pressure is 8 barg.

 

The capacity of each air receiver is 10 m3.

 

Each air receiver has an air trap to drain the condensate formed.

 

We have to prepare a datasheet for air trap.

In this regard i wanted to know how to calculate the flow rate  of condensate through air trap.

 

thanks in advance.

 

 

[breizh]

Hi,

Consider this resource , you should find the answer .

 

Hope this helps

 

Breizh

[arkae]

thankyou very much sir...

[Babu Prasad]

There is no need of moisture trap on the receiver at outlet of dryer. Simple drain line is enough. Operator can ensure once in while any water accumulation. This is another tool which indicates performance of inst air dryer. In fact you have to remove the  trap on outlet of air dryer vessel. 

[Art Montemayor]

 

 

 

Arkae:

 

You don’t have an “air drain trap” on either your wet or dry air receivers.  You are not draining air; you are draining water.  What you probably have is nothing more than an automatic drainer – as illustrated in the literature that Beizh has kindly furnished you.  Your drainer should NOT be an inverted bucket type.  It should be a float type drain trap.  If installed correctly, it should have block valves on the inlet and outlet sides with a globe valve acting as a by-pass around the drainer.  This will allow you to work on the drainer when it starts to leak of fail to seat properly, while still being able to manually drain your receiver.

 

Babuprasad is right: you don’t need an automatic drainer on the dry air receiver downstream of your dryer – that is, if your air dryer is working properly.  You don’t furnish a schematic sketch of your system, so I have to assume that you have a properly installed compressor-dryer system and that you have an aftercooler with a water separator downstream of it immediately after the compressor’s discharge.  This separator should have its own automatic drainer.  The “wet” air receiver has a drainer also because there may be some condensation taking place inside it due to a cold ambient temperature in your locale.

 

You calculate the maximum flow of condensate through the separator’s drainer by assuming that your compressor is taking in water-saturated atmospheric air and condensing the contained water moisture in the aftercooler.  If your air compressor is a 2-stage model, then you will have an intercooler with a separator and drainer located after the 1^st stage.  This means you will be draining some of your water after the 1^st stage as well.