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The basic principle of the negative pressure system is to keep the pressure of the environment inside the container lower than that outside, so that the toxic gas or flammable gas in the container will not be directly discharged from the it, and the negative pressure system captures dangerous and infectious particles in the air, and it is removed with a blower and a set of filters.
The negative pressurized container provide by TLS typically has 2 fans, a small fan for normal mode and a large fan for emergency mode. When either fan is turned on, a negative pressure environment is formed inside. When only the small fan in the fume hood is turned on, the internal pressure is around -30~40Pa, and normal ventilation mode in the container; When the flammable gas/H2S low level alarm is triggered, the outdoor Ex-fan will automatically turn on, the internal pressure is around -130Pa and the container enter the emergency mood and it will automatically turn off when the gas concentration is lower than the set value. If the gas concentration does not decrease, the high-level alarm of flammable gas/H2S would sound, after the alarm lasts for 10 seconds, the power supply of the container will be cut off.
Negative pressure is a safe sealing solution which is widely used in lab containers, Mud Labs, etc.

Negative air pressure is a safe containment solution in which more air is taken in than is expelled.
Negative air pressure in the environment does not mean that the actual pressure is negative because, according to science, absolute pressure can never be less than zero. Negative air pressure means that the pressure within an environment is less than the pressure of its surroundings. As air flows from high pressure to low pressure, this difference in pressure level acts as a vacuum effect and causes air to flow in from the outside.
The negative air system produces a vacuum effect or a direction of air flow into the space by creating and maintaining the air pressure differential. In doing so, it restricts the spread of contaminants such as dust and mould and pollutants such as bacteria and viruses from the controlled space to the outside.
This system traps dangerous and infectious particles in the air and removes them by means of a blower and a group of filters.
In summary, when the external environment is safe, but toxic and harmful gases are generated inside, negative pressure is preferred
•      Modular Petroleum Laboratory
•      Laboratory container / cabin
•      Blast Resistant Container, Blast proof Container
•      Mud Lab 

What is negative pressure?
When the exhaust air volume in the space is greater than the air intake volume, the space is in a negative pressure state, the air outside flows into the interior and is discharged through the exhaust outlet for centralized treatment.

When to choose negative pressure?
When the external environment is safe, but toxic and harmful gases are generated inside, negative pressure is preferred.

• Modular Petroleum Laboratory
• Laboratory container / cabin
• Blast Resistant Container, Blast proof Container
• Mud Lab

 
NEGATIVELY PRESSURISED CONTAINERS PROVIDED BY TLS

• DNV2.7-1 / EN12079 certification
• CSC plated
• A0 or A60 fire rating
• Autonomous fire, gas and smoke detection system.
• Self‐contained Heat, Ventilation and Air Conditioning (HVAC) system, with fast-plug connection to rig power supply system
• Water supply system with connections to rig supply system
• Air Pipeline connected with air gun 
• Negative pressure inside
• Explosion proof fume hood
• Acid and alkali resistant anti-static workbench
• Area Network (LAN) access.
• Working and storage furnitures
• Anti-slip flooring
• Ex light, switch, socket, cabling
• Quick and easy hook up to on-board services
• Designed for easy stacking
• Compliant with ATEX, IECEx standard on request.
• 10ft, 20ft, or customised dimension according to requirement

Positive pressure and negative pressure are relative to the pressure in the surrounding space.
 
Positive pressure: the air supply volume is greater than the exhaust volume. The indoor air is under positive pressure. Combined with the air conditioning unit, the cleanliness of the air sent into the container can be guaranteed.
Positive pressure is preferentially applied to containers where the external environment is harsh (such as ZONE 0, ZONE 1, and ZONE 2) and the internal environment is secure.
Please download the A60 offshore pressurised container product brochure for reference. 
 
Negative pressure: the air supply volume is less than the exhaust air volume, and the room is under negative pressure. The surrounding air flows into the space and is discharged through the exhaust outlet for unified treatment.
Negative pressure is preferred in containers where the external environment is safe but the interior will produce toxic and harmful gases.
​Please download laboratory container brochure for reference.