The present invention concerns a calculation method (1000) for the positioning of sensors for measuring an odorant gas in a natural gas network (2000), comprising the steps of: acquisition (1010) of data representing the physical state of the natural gas network (2000), simulation (1020) of the natural gas network (2000), calculation (1030) of the position of odorant gas sensors.

Some embodiments are directed to a module for depressurisation and storage of a portion of a gas layer coming from at least one cryogenic tank. Some other embodiments are directed to a system using such a module.

A system is provided. The system includes one or more of a first bellows assembly, which includes a first bellows block, a second bellows block, a first pumping bellow, and first and second seals. The first bellows assembly includes a master fluid inlet port configured to receive a fluid and route the fluid to a first coupling. The second bellows block includes a master fluid outlet port and configured to route the fluid in a pressurized state from a second coupling to the master fluid outlet port. The first pumping bellow includes first and second bellow ports, the first pumping bellow oriented between the first and second couplings and coupled to a pump configured to pressurize the fluid. The first seal is disposed between the first coupling and the first bellow port and the second seal is disposed between the second coupling and the second bellow port.

Some embodiments are directed to a module for depressurisation and storage of a portion of a gas coming from at least one cryogenic tank. Some other embodiments are directed to a system using such a module.

The invention relates to a system and a method for injecting liquid odorant into a natural gas pipe, the system comprising: a tank containing the odorant in liquid form; a high-pressure pump connected to the tank; a common injection manifold fed with liquid odorant by the high-pressure pump; a plurality of odorant injectors fed with liquid odorant under pressure by the common injection manifold for the purpose of injecting the odorant into the gas pipe so as to cause it to be atomized in the gas pipe; and an electronic injection computer for controlling the injectors and the high-pressure pump.

An improved system, apparatus and method for injecting a chemical from a storage tank into a natural gas or liquefied petroleum gas pipeline at a flow-controlled injection rate is provided. The system, apparatus and method including a pair of positive-displacement pumps driven in substantially complementary fashion by a single driver, a controller controlling the driver, and each pump being fed from the storage tank and discharging chemical into the pipeline. The system, apparatus and method may also include a second pair of positive-displacement pumps having substantially similar displacement and operatively connected to the first pair of positive-displacement pumps, the first pair of positive-displacement pumps being driven in a substantially complementary fashion with the second pair of pumps by a single driver or a pair of drivers.