Tank in fill valve and flow device

[SystemDesigner]

Hi Guys

I need some assistance....

What type of valve should i use for the tank infill? Should the tank infill line have a flow measuring device to monitor the rate of infill.

The above must be in accordance with NFPA std.

 

[cdafd]

not sure if this helps you any::

http://www.eng-tips.com/viewthread.cfm?qid=243270

 

[cdafd]

NFPA 22

know nothing about tanks


13.1.10 Filling.
13.1.10.1 The tank shall be kept filled, and the water level shall never be more than 76 mm or 102 mm (3 in. or 4 in.) below the designated fire service level.
13.1.10.2 The filling bypass shall be kept closed when not in use.
13.1.11* Water-Level Gauge. A water-level gauge of suitable design shall be provided. It shall be carefully installed, adjusted, and properly maintained.
13.1.11.1 Where an altitude gauge is used, it shall be at least 152 mm (6 in.) in diameter and shall be of noncorrodable construction.
13.1.11.2 The gauge shall be located to prevent it from freezing.
13.1.11.2.1 If necessary, it shall be located in a heated building or enclosure.
13.1.11.2.2 A blow-off cock shall be located between the gauge and the connection to the tank.
13.1.11.3 A listed, closed-circuit, high-water and low-water level electric alarm shall be permitted to be used in place of the gauge where acceptable to the authority having jurisdiction.
13.1.11.3.1 Provisions shall be made for the attachment of a calibrated test gauge.














13.4 Filling.
13.4.1 Bypass around Check Valve.
13.4.1.1 Where the tank is to be filled from the fire protection system under city or fire-pump pressure, the filling pipe shall be a bypass around the check.
13.4.1.2 The bypass shall be connected into tapped bosses on the check valve or into the discharge pipe between the check valve and all other valves.
13.4.1.3 The bypass shall be sized to fill the tank in 8 hours but shall not be smaller than 50 mm (2 in.).
13.4.1.4 A listed indicating control valve shall be placed in the bypass and shall be kept closed except when the tank is being filled.
13.4.2 Filling Pumps.
13.4.2.1 When the tank is to be filled by a special filling pump, the pump and connections shall be of such size that the tank can be filled in 8 hours.
13.4.2.2 The filling pipe shall be of at least 50 mm (2 in.) and, except as noted in 13.4.3, shall be connected directly into the tank discharge pipe, in which case a listed indicating control valve and a check valve shall be placed in the filling pipe near the tank discharge pipe, with the check valve located on the pump side of the listed indicating valve.
13.4.2.3 The filling pump suction pipe shall not be connected to a fire service main that is supplied from the tank. The filling valve shall be open only when the tank is being filled.
13.4.3 Where a separate fill pipe is used, automatic filling shall be permitted.

 

[chicopee]

Ok, am I missing something about your inquiry!!! what type of a tank are you talking about?

 

[DavidCR]

I´m not sure if the filling equipment should be listed for fire prot.?

In my case I´ve found lots of different filling sources that it is almost impossible to have full aproved components, so I have interpreted from NFPA that it must be endorsed by he AHJ or good criteria.

I suppose you are thinking of automatic valves with level control..., so think of float valves.

If you have low or mid pressure think of valves like in

http://www.keckley.com

(I have used model#27 with inlet pressures of 5psi and they work fine).

If you have mid or high pressure, or if you think of more control options, think of hydraulic control valves Bermad, OCV, Watts), for pressure reducing, float pilot operated level control.

I´ve never had a tank system that fils with pumps.

Think of strainers, emergency/manual bypass.

Sorry mates, but I have to admit that sometimes a fire protection engineer would not be the best choice to design a fire water tank filling system if it is not his field of expertise.