Pressure relief valves for large walk in freezer

[derek@crh.]

Is there an accepted formula to calculate the number of PRV's required in a specific sized freezer room?.
Derek:confused:

[Brian_UK]

Don't know about calls but this advert has some sizing data which might be of use.

Click on the 'document download"
https://www.ixl.co.th/en/products/accessories/pressure-relief-valve-prv/kason-pressure-relief-ports/

[Josip]

Hi Derek,

check this link, too

https://www.fermod.com/valve-2227-cat4-prd342-fp.php
(https://www.fermod.com/valve-2227-cat4-prd342-fp.php)
here you can find info you need .... check download at bottom of the page ...


Best regards, Josip

[RANGER1]

Derek,
Go out the back, you will find some in your warehouse https://www.crh.com.au/products/refrigeration-hardware/pressure-relief-valves

[Segei]

I just wandering how often people use these PRVs? Personally I didn't see any PRV.

[RANGER1]

I just wandering how often people use these PRVs? Personally I didn't see any PRV.

Segei,
I would call them a vent or port for either way air flow in a cool room or freezer.
Have heard of implosions on blast freezers.

[Segei]

I can’t imagine industrial freezer or blast freezer to have absolutely tight doors. In addition every cold room has evaporator with drain line going outside of that room. I can’t imagine how to get vacuum in industrial cold room.

[RANGER1]

Segei,
Understand what you say, but is probably insurance for possible event.
Client had a -40 blast carton tunnel at abbatoir was turned off for several weeks for maintenance.
Client turned on with maximum cooling power, room imploded due to rapid contraction of air in refrigerated space.
Other reasons in link below

https://www.cold-rite.com.au/post/pressure-relief-vents-in-cool-rooms-freezers

[Segei]

RANGER1,
I mentioned about industrial refrigerated room. I did't see any door that is perfectly tight. Walk-in freezer is the different story. Regular swinging door with good seal can be done tight. Industrial freezers have sliding or overhead doors and these doors are not tight.

[RANGER1]

Segei,
We in Australia generally use them on industrial installations of all types.