From: Gerald Fisher
Sent: Thu Feb 01 09:55:57 2018
To: Andy Peters
Cc: Adam Shultz; Jake Ehredt
Subject: RE: New WO#697: We would like to pressure
Importance: Normal
Andy,
I think vactoring and checking the type of saddles is still the best way
to go but will let you and the crew try another option.
My only thought is we need test at static pressure and if it holds then
test the line to 150 PSI for one hour like we do new lines. That will
require the installation of the straddle block at the end of the waterline
since we have no record of restraint on that line.
Note though that even if we hold pressure today, degradation of a service
saddle, made of the same material, can and probably will happen again in
the near future. That being said, go ahead with the pressure static
pressure test and, once the block is in place, the 150 PSI test to see if
we have immediate other problem spots. Also, be ready to dig up the road
and replace the other saddles because pumping up the waterline probably
will pop others loose causing another shutdown with folks out of service.
I still think it's a risk but go ahead with your plan once everything is
in place.
Regards,
Gerald Fisher, P.E. | Public Works Director
City of Molalla
117 N Molalla Ave. | PO Box 248 |Molalla, OR 97038
Office: 503.829.6855 <callto:503.829.6855> | Direct: 503.759.0218
<callto:503.759.0218>
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-----Original Message-----
From: Andy Peters [mailto:apeters@cityofmolalla.com]
Sent: Thursday, February 01, 2018 9:19 AM
To: Gerald Fisher <gfisher@cityofmolalla.com>
Cc: Adam Shultz <ashultz@cityofmolalla.com>; Jake Ehredt
<jehredt@cityofmolalla.com>
Subject: FW: New WO#697: We would like to pressure
Gerald,
Adam, Jake and I came up with an easy way to ensure other saddles on
Storey are not leaking without requiring excavation. The work order below
explains the plan - so if we run in to any questions in the future (say,
from our insurance company) we I'll have documented our risk management
steps.
If we find pressures still dropping we will talk about exploring the
remaining service saddles. Let us know if you have any thoughts.
Andy Peters
City of Molalla
Public Works Operations Supervisor
(503) 829-6855 x220
Cell: 503-793-0507
apeters@cityofmolalla.com <mailto:apeters@cityofmolalla.com>
117 N Molalla Ave
Molalla, OR 97038
-----Original Message-----
From: MolallaOps@CityOfMolalla.com [mailto:MolallaOps@CityOfMolalla.com]
Sent: Thursday, February 1, 2018 9:14 AM
To: apeters@CityOfMolalla.com; apeters@CityOfMolalla.com
Subject: New WO#697: We would like to pressure
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NEW WO#697 requested by apeters. Promise Date: 2/16/2018 12:00:00 AM
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We would like to pressure leak test Storey Dr, to ensure no other service
saddles are leaking. This should tell us if further exploration is needed.
During hot tap for bear creek we saw pressures drop rapidly on shutdown.
We now know this was due to the leaky tap that ultimately cause Storey to
fail. Now that the tap is fixed, we should see the line holding pressures.
if not, we should suspect further leaking going on. This is a risk
management action, to ensure we are doing everything we can to avoid
damage to customer property (like cars parked on the road) See Jake and
Adam for further details.
1) Set up static pressure gauge on hydrant at end of line.
2) Notify all customers, then turn off all curb stops.
3) Turn off isolation valve. stopwatch the pressure gauge to 50 psi.
4) Turn on isolation valve and recover pressure before dipping below
20psi.
5) Note results and whether we think Storey is still leaking.
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