Hamer Blinds

[BCJ]

Has anyone had a positive experience with hamer line blinds in 150 PSIG organic service?

I also need to know if you are in an area that would regularly measure the flange of the hamer blind for VOC leaks.

I need to give our operators a safe alternative to our current setup of blinding the furnaces in our ethylene plant.

My company currently only has three applications:
1. Crude C4 rail car loading service (no problems with leaks) at 80 PSIG
2. Decoke air on a furnace (leaks like a sieve -- no PMs)
3. Flare header blinds at 2 PSIG

Any information would be greatly appreciated.

Thanks,BCJ

 

[williams21034]

BCJ,

Hammer blinds are a type of inline blind. it is a better solution than breaking bolts, but it is not the best equipment on the market.

Look into the Onis blind, it is a little more expensive but it is better designed, safer, faster, and widely used on frequently blinded ethylene furnaces.

They are used in low and extremely high pressures and temperatures.

website:

http://www.onis.fr,

not the best but maybe you can find a local contact

Tom

 

[skippy2]

BCJ,

We have had experience with both types of operator-swung blinds (Hamer and ONIS) in an ethylene plant.

I agree with the comments of Williams21034 in that overall, the ONIS design is better than the Hamer from a safety and leakage point of view. On both types it is really important that the seating faces are maintained well and that the gaskets are carefully inspected if re-using.

We have had good experience with the ONIS blinds in a hot oil service (~200°C) which the Hamer blinds (with "high temp. Viton" o-rings) weren't able to handle.

In light hydrocarbon service (eg C2 to C4's), I have noticed leaks from the seals of the Hamer blinds, and so I'd say that they are probably more suitable for use in lower pressure, liquid service. We don't do VOC monitoring on ours as far as I know.