13 replies to this topic

[hpe]

dear all
we encountered with freezing water of safety shower at winter.then we used steam tracing for these pipes.
because of stagnant of water, the temperature of water increase then for using of safety shower ,our personnel must be wait for draining of hot water. you know that its not recommended by HSE. how do you solve this problem?
best regards

[ankur2061]

dear all
we encountered with freezing water of safety shower at winter.then we used steam tracing for these pipes.
because of stagnant of water, the temperature of water increase then for using of safety shower ,our personnel must be wait for draining of hot water. you know that its not recommended by HSE. how do you solve this problem?
best regards

hpe,

This is a very common problem for safety showers where ambient temperatures can go low. Also as far as the max. temperature of safety shower is concerned it is recommended as 38 deg C.

The best way to mitigate the effects of high & low ambient temperatures is to run the water supply line to the safety shower 'buried' as close as possible to the safety shower. This should to a great extent reduce the impact of the extremes in ambient temperatures.

Hope this helps.

Regards,
Ankur.

[VikingUK]

have you tried lagging the pipes and fitting electric heat tracing ?

[ankur2061]

[/quote]
have you tried lagging the pipes and fitting electric heat tracing ?
[/quote]

VikingUK,

Have you read the post carefully? The problem is of hot water due to tracing. How do you think lagging and electric heat tracing is going to alleviate this problem? As I have mentioned earlier, by burying the water supply line to the point as close as practicable to the safety shower, the extreme variations of ambient temperature which can lead either to freezing or hot water can be mitigated. This of course is again conditional, depending on whether your safety shower layout permits you to run a buried line from the water source to the safety shower.

Regards,
Ankur.

[VikingUK]

I meant REPLACE your steam tracing with electric trace heating

[hpe]

DEAR FRIENDS

do you have standards for using electrical tracing at gas treating plants?
with using elec.tracing & stagnant water, can we control water temp. @ 38C?

[Sridhar P]

Dear Friend,

Refer to the standard ANSI Z358.1 - Standard for Emergency Eyewashes and Shower Equipment. The recommended temperature is from 60 deg F to 100 deg F. You can get abstract of the same in the net.

One method is to provide a common water tank with heater and temperature control and supply to the various consumers.

Also many vendors are available to provide the emergency shower/safety shower confirming to the code requirements. Vendors can also be found in the net easily.

Best Regards

[Technocrat]

Dear all,

The problem occurs due to stagnant water. If you can keep the wash water running through the shower circuit this problem can be solved. You have to make provision for continuous inflow to the shower from source tank and continuous outflow back to the source tank. When the shower is operated the water will flow out of the shower spray due to less resistance to water to flow.

I do not agree to provide a common water tank with heater and temperature control and supply to the various consumers. Because when the shower is not operating for a long period the hot water will be stagnant again and freeze over the time.

Regards,
Dhirajkumar.

[breizh]

Hello ,
Like other pieces of equipment , safety showers must be managed ! You need a winterization plan like for other water pipes and of course you need inspection to ensure you will not have stagnant water in your pipes ( bacteria , dirt,....) . My advise is to put in place a periodic check ( daily , weekly ,..) to ensure you have proper protective equipment in place .



Hope it helps

Breizh

[Chem01]

hpe,
We provided small drains at the inlet water to safety shower, and kept the drains little open. This is a small wastage but it keeps water flowing and maintain the temperature milder.
Regards,

[Technocrat]

Dear Chem01,

Where is that continuous drain located on the shower assembly? Have you checked total water wasted per day ? You may collect all the waste water from safety shower drain in a common sump and pump it back periodically to the source.

Regards.

[Chem01]

Dhiraj,
Drain is located at water inlet line just before entering the shower, before this the weter pipe runs some length outside the buried area. Yes wastage is there but operators safety is more important in this scenario at the cost of the wastage.

[joesteam]

How about using a regulator on the tracing that will control the temperature of the stagnant water? This would be the easiest solution, I would recommend an on/off control as tracers do not like modulating control due to the pressure drop of condensate in the little tubing.

Another solution is right at the shower, a company called Ogontz makes a solution for these systems. (I am not affiliated with them).

Look at:
http://www.ogontz.co...dprotection.htm

[shan]

dear all
we encountered with freezing water of safety shower at winter.then we used steam tracing for these pipes.
because of stagnant of water, the temperature of water increase then for using of safety shower ,our personnel must be wait for draining of hot water. you know that its not recommended by HSE. how do you solve this problem?
best regards

You should install a throttling valve on the steam tracing line. The valve allows you to adjust heat input from steam balanced with heat loss to cold ambient so that the shower water temperature will be constant.