LOL!!!!!
--- Steve McKenzie <Mechproj@xtra.co.nz> wrote:
> Hi Paul
>
> I envisage the following ten step procedure:
>
> 1) Lodge a Work Request to install a "No Smoking"
> sign on the Cooling tower
> deck
>
> 2) When the Work Order is issued, alert
> Production,switch on to mains
> cooling, tag out, and allow at least 2 days for
> drift to subside. Be sure
> that the tower wetting sprays are disabled and
> tagged out. This is essential
> to prevent any biocide exposure hazard. Tag out the
> fire pumps to prevent
> accidental operation of the tower fire sprinkler
> system to avoid
> re-entrainment of settled biocides plus the danger
> of a worker slipping on
> wet surfaces.
>
> 3) Install sign. During the course of welding the
> sign stanchion in place it
> will be noticed that the cooling tower fill has been
> set alight from welding
> sparks. Ensure maintenance personnel evacuate the
> cooling tower and the fire
> water pump area which, as previously noted, is close
> to the cooling tower,
> and will be deemed a hazardous area in the event of
> a fire. Commence filling
> out Incident Report form.
>
> 4) As the fire pumps are tagged out and the tags are
> in a hazardous zone
> there is no alternative but to watch the tower burn
> out. Rapid burn times
> vary depending on fill material, fill moisture
> content, and elevation. As a
> guide, I recommend allowing 60minutes for Sitka
> spruce and 95 minutes for
> PVC fill, all at 132.3m above local "low water
> level, ordinary spring tide"
> datum, but times can vary widely. It is recommended
> that several towers be
> burnt down first, as a trial, and the longer time
> adopted for planning
> purposes.
>
> 5) When the flames have subsided, apply for
> Hazardous Work Permit, and
> instigate cancelling of previous tags. This may take
> some time, as the sign
> fitters may be undergoing trauma conselling at a
> mountain retreat, and their
> clearance signatures will be required. Allow 2 days
> plus travel time plus
> accommodation plus ski passes for the family for
> this activity.
>
> 6) Upon obtaining HWP turn on fire pumps and douse
> residual fires.
>
> 7) This is where it becomes a little tricky. To work
> on the fire reservoir
> it will probably be necessary to drain it. A reserve
> water reservoir is
> required. You now have a spare cooling tower basin
> as a reservoir if you dig
> a short trench to the fire pumps. This circumstance
> has arisen only because
> the tower is burnt down. In any other circumstances,
> Production would object
> to this use of the basin. However it is essential
> that the effective basin
> volume exceeds that of the reservoir. If it does
> not, repeat steps 1 to 6
> plus trenching, on one or more other cooling towers
> until the total
> available basin volume exceeds the reservoir
> capacity. At this point it will
> become necessary to check that the mains residual
> head flow characteristic
> exceeds the minimum requirements for a primary fire
> fighting water source.
> If not, it may mean at least doubling the amount of
> cooling towers to be
> fitted with "no smoking" signs. Check with your
> Insurer and the local
> authorities.
>
> 8) Make planned modifications to reservoir.
>
> 9) Remove all tags.
>
> 10) Look for a new job.
>
>
> Cheers
>
> Steve McKenzie
>
> -----Original Message-----
> From: Paul Bowers [mailto:pbowers@pipingdesign.com]
> Sent: Thursday, October 10, 2002 5:07 PM
> To: PipingDesign@yahoogroups.com
> Subject: [PipingDesign] Fire Water Tank Capacity
> Upgrade
>
>
> Ah, the good old days.
>
> How to upgrade the capacity of a fire water holding
> tank without shutting
> down the refinery?
>
> Let's assume the tank is close to a cooling tower
> and is near the fire water
> pump pit. It is the only reservoir available and
> foam backup is not
> feasible.
>
> I know how it *was* done in one case, anybody care
> to take a guess?
>
> Paul
>
>
>
>
> Texas Flange - a good source for information on
> industrial flanges, all they
> ask is for referrals for designs they help with.
> 877-610-8924.
> www.texasflange.com
>
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