Offloading 29% aqueous ammonia with sliding vane pump
Offloading 29% aqueous ammonia with sliding vane pump
(OP)
I am designing an aqueous ammonia offloading station to unloading 29% aqueous ammonia. I recommended using a positive displacement pump (sliding vane from Blackmer). But this pump is not designed to meet API 676 spec. The pump capacity will be 180 GPM and discharge pressure is 20 psig. Any one has experience with this kind pumps for such service?
Thanks,
Yuze
Thanks,
Yuze





RE: Offloading 29% aqueous ammonia with sliding vane pump
Please explain why you must meet API-676 for aqueous ammonia loading service ...
API-676 was written in order to help specify robust rotary pumps for viscous oil-industry service.
I do not believe that you need such a pump.....
Your rotary vane pump is the correct one.
Tell us more about your insatllation..
-MJC
RE: Offloading 29% aqueous ammonia with sliding vane pump
The reason that the pump must meet API 676 is our company specification requirement, basically for quality control.
Twe years ago, the company started the ammonia unloading facility project. As I said, the aqueous ammonia is 29% aqueous ammonia. In the summer time, the ambient temperature is about 30°C (86°F). Normally, the tanker truck will travel about 700 KM to the site. At the worst scenario, the truck may have to wait two hours to be unloaded. This means that the ammonia inside the tanker is almost near the boiling point. To meet the NPSHR for the pump, we designed a canned pump (centrifugal) 15 ft underground with complicated control system to avoid cavitation problem. Over budget caused the project being cancelled.
This time I tried to avoid the underground pump. The pump distributor recommended using rotorary sliding vane pump. I think this is the correct option. I recommended using the PD pump. However, the pump supplier specifically states that the pump does not meet API-676. I am trying to create a spec deviation for the installation of this kind pump. The pump supplier sent an 18 pages document to show the discrepencies of the pump design to API 676.
We don't have experience with this kind pump installation. Hoping that someone with experience with this kind pumps provides your opinions, we will make the final desicion.
Thanks,
Yuze
RE: Offloading 29% aqueous ammonia with sliding vane pump
does the shipper offer a trailer with its own pump as an option? if so, you do not need your pump.
also, are you venting your storage tank back to the trailer when off-loading? if so, you might consider the compressor method.
you might look at some of the links here for more info:
http://www
i used to be involved making it but never unloading it.....
RE: Offloading 29% aqueous ammonia with sliding vane pump
We unload with standard end suction pumps - lots of considertations for installation, layout and more importnatly control, however, we have lots of pumps successfully doing this duty. Alternatively, we can look at self priming mag dirve pumps for such a duty. Have a look at the web-site to see some news features on tanker unloading, and im sure you will be able to pick up some important considerations - excuse me if this sounds like a sell...
Ash Fenn
www.cdrpumps.co.uk
RE: Offloading 29% aqueous ammonia with sliding vane pump
RE: Offloading 29% aqueous ammonia with sliding vane pump
Could you recommend some of the pumps used on ammonia survices?
Yuze
RE: Offloading 29% aqueous ammonia with sliding vane pump
RE: Offloading 29% aqueous ammonia with sliding vane pump
Ash Fenn
www.cdrpumps.co.uk