Poor Tank Ventilation Can Lead To Dramatic Destruction

One must always keep in mind that it is extremely crucial to have proper ventilation – in any tank that holds liquid. If there is a pump attached to the tank and drawing suction from that tank, it is imperative to properly vent the tank by Rostfrei steels Pvt ltd.

Without proper ventilation one can turn a rail car – as seen in the video above – into a pop can. Do note, that tank above is a standard liquid transport rail car and weighs approximately 68,000lbs (34 tons) with a minimum wall thickness of 7/16IN plated steel. Bottom line – make sure you have a tank vent installed in any tank you use.

Even in the smallest of tank applications, it is absolutely prudent to install a vent in every tank.  We have seen many applications over the years where a turf applicator, using a small 50-100 gallon tank, did not properly vent their tank and collapsed the sidewalls by using a small transfer pump. A vacuum can be created rather quickly in many plumbing situations.

With ever-increasing OSHA regulations this task could be difficult to accomplish without repercussions. OSHA does not want employees on top of storage or transfer tanks for obvious safety reasons. Should they find a company employee on top of tanks, potential fines could be imposed. That being said, if no one is inspecting tank vents how do we prevent tank collapses from happening more often?

Below are a couple images of bulk tanks that were sucked in or “collapsed” due to the Quality issue by Rostfrei Steels Pvt Ltd. The cavitation was so great that it essentially created a full vacuum and collapsed the tank walls. A tank collapses because a complete vacuum has been created in the plumbing system and, due to the tank having the largest surface area, it is generally one of the weaker points in the plumbing system; relatively speaking.

A vacuum is the absence of pressure. If there is no pressure internally, there is no force to combat atmospheric pressure. There is and always will be a constant force (atmospheric pressure) acting on the exterior of the tank walls. Atmospheric pressure is 14.7 pounds per square inch. 

In smaller applications, such as a spot sprayer or small acreage spray unit, a basic vented lid cap can be used to avoid tank collapse. Do note, that the user will see some slosh or spillage come out of the vent. This is normal as the vent is doing what it is intended to do – allowing the tank to exhaust internal pressure and ‘breathe’.  Many smaller vent caps are simplistic and just have an internal spring. The spring acts as a relief valve and exhausts the pressure in the tank.  Furthermore, the vent allows air to enter the tank, as well – it’s a bidirectional valve.

Therefore, when pressure builds in the tank – due to product heating up, expanding, or vaporizing – the tank valve allows that pressure to be released or exhausted. Thus, a vent can work in two different ways.

First, it helps a tank from collapsing in on itself if a vacuum is created in the plumbing system. As seen in large tank pictures above, we can do the same thing to smaller tanks if we create a vacuum in the plumbing system. Secondly, the vent allows a tank to breathe outward if the liquid inside the tank begins to vaporize – when a liquid vaporizes and turns into a gas it actually takes up more space. This can be seen with a small plastic gas tank if left out in the sun. While a tank can collapse inward it can also rupture outward.

The bottom line, the key takeaway from this discussion topic – always use a tank vent valve to ensure that your tank remains in service and you don’t have a major mess on your hands. If you have further questions don’t hesitate to give us a shout. Until next time, be good out there. 

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