What is a lockout tagout warehouse


At a tank farm there are many devices and systems that contain the generated energy in a wide variety of forms. Multiple safety barriers and protective systems have already been installed on site so that employees are not exposed to any dangers during their normal work. However, safety is also of great importance for activities that are not part of the work routine, such as maintenance or repair work, where unexpected switching on or starting of a machine or the unexpected release of stored energy can lead to injuries. For example, if someone works on a machine that has definitely been switched off and another person accidentally switches it on, this can lead to serious accidents. The method recommended and used in industry to ensure that energy sources are switched off, the energy flow is definitely zero and the energy sources cannot be switched on again before the maintenance work has been completed is called LTT (Lock-out, Tag-out, Try- out). In addition to the shut-offs of the power supply, for which LOTO (lock-out, tag-out) was used in particular, mechanical shut-offs are no less important for the same reasons.

How does the LTT (lock-out, tag-out, try-out) procedure work?

Specifically, lock-out is understood to mean the disconnection of energy from the system (for example from a pump), whereby the energy is physically safely separated, e.g. by the circuit breaker. In most cases, these devices and devices have an additional locking mechanism that can be added or already built in, or even an integrated component to which a locking device can be attached. A locking device can be any device that is able to ensure disconnection from the power supply, such as a padlock. There are specific guidelines that must be adhered to for devices that have to be disconnected from the power supply. In any case, it must be ensured that the lock cannot be removed and that the system cannot switch on unexpectedly or accidentally start up. There is only one key for each lock; a master key is not approved. If several groups or work areas are working on the same job, a lockable key box is used to manage the keys. In this way, employees are protected with the same level of security as when setting up a personal locking and identification system.

In addition to the disconnection from the energy supply or the protection against being switched on again, a so-called tag-out process (personal identification) is used. In practice, a distinctive tag-out warning label (usually a standardized, weather-resistant label) is permanently attached to the locking device to indicate that the locking device and the device that has just been checked or the system that has just been serviced will only then be restored may be operated if the tag-out warning label has been removed again. However, the warning labels do not offer the same level of protection as a permanent power cut-off, so further measures are required in this case. A confirmation label similar to a tag-out warning label is generally used in conjunction with a latch. Only the authorized person who has attached the lock or the warning label to the system is authorized to remove it again. This procedure ensures that the system cannot or cannot be started without instruction or without the knowledge of the authorized person.

In fact, during a try-out, a colleague has to check whether the system is properly and adequately shut off and that there is no residual energy. Only then can the actual work begin. With the LTT process, it is not enough to just put a barrier on a counter and sign it. More extensive measures have to be carried out here. A control plan for the energy flow is to be drawn up, which enables coordination, checking and communication for the authorized as well as for other affected employees.

What is the purpose of the LTT (lock-out, tag-out, try-out) procedure?

Try-out focuses on an additional level of security that involves zero energy control. “LTT is a visible real-time system. In conjunction with training and additional information about the concept and rationale of safety, the system can raise awareness of safety and help ensure that health, safety and wellbeing is an important part of every employee in every workplace. Thinking, planning, controlling and communicating are important investments in the security of every individual - regardless of whether one is authorized or not.

LTT(Lock-out, tag-out, try-out)at a glance

Lock-outThe energy source is shut off, the locking device is on "off" or "safe"
Day outThe energy source is shut off or this state is indicated by warning labels
Try outThe energy status is checked and checks are carried out to ensure that the energy supply has definitely been switched off


Oiltanking is committed to ensuring the safe and efficient operation of its facilities. Since 2017, Oiltanking has stepped up its efforts to introduce the LTT (lock-out, tag-out, try-out) process instead of the LOTO (lock-out, tag-out) process at all locations around the world.

Status: December 2016
All statements without guarantee