[env-trinity] Fw: [Trinity Releases] Change Order - Lewiston Dam

David Webb dwebb1 at wildblue.net
Wed May 1 10:38:21 PDT 2019


The power plant I ran had an emergency release valve which generically 
was called a hollow cone valve.  Properly it was a Howel-Bunger Valve.  
I suspect that is what they are talking about.  for us it opened 
automatically whenever there was a power outage so as to maintain 
instream flows, and also as the only mechanism to drain down the lake in 
an emergency situation other than through the generators, which by 
themselves couldn't release enough water to do the job.  Making repairs 
to such an item is difficult if it must be available for service at all 
times.  I have no idea if tht is the case with TR Dam.

Dave

On 5/1/2019 10:08 AM, Rukim1259 at sbcglobal.net wrote:
> What are the “Hallow jet structures”?
>
> Sent from my I-phone
>
> On May 1, 2019, at 9:54 AM, Tom Stokely <tstokely at att.net 
> <mailto:tstokely at att.net>> wrote:
>
>> ----- Forwarded Message -----
>> *From:* 'SANDBERG, JEFFERY' via trinity-releases 
>> <trinity-releases at googlegroups.com 
>> <mailto:trinity-releases at googlegroups.com>>
>> *To:*
>> *Sent:* Wednesday, May 1, 2019, 8:51:11 AM PDT
>> *Subject:* [Trinity Releases] Change Order - Lewiston Dam
>>
>>
>> Project:  Lewiston Dam
>>
>> Date     Time          From (cfs)    To (cfs)
>>
>> 4/30/19 18:00        8500             8000
>> 4/30/19  20:00       8000             7500
>> 4/30/19  22:00       7500            7000
>>
>> 5/01/19  00:01       7000             6500
>> 5/01/19  02:00       6500             6000
>> 5/01/19  04:00       6000             5500
>> 5/01/19  06:00       5500             5000
>> 5/01/19  08:00       5000             4500
>> 5/01/19  10:00       4500             4000
>> 5/01/19   12:00      4000             3500
>>
>>
>> Comment:  Emergency Reduction in Trinity Flow rates due to signficant 
>> oil leak detected in Hollow Jet Value release structures.
>>
>> Issued By.  J. Sandber
>> -- 
>> View online at http://www.trrp.net/restore/flows/release-email/
>> ---
>>
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