The invention relates to an examination process for the in situ determination of rate of feeding an inhibitor into a gas pipeline for preventing hydrate formation comprising the steps of: - taking gas in situ from a gas well through a gas conduit (10) having an inlet (10'), - feeding the inhibitor into the gas conduit (10) at the examined feed rate, - transporting the gas comprising the inhibitor to a coolable portion (11) of the gas conduit (10) and cooling it there to a given temperature, - measuring pressure difference between at least two locations of the coolable portion (11), and determining from a measured pressure difference hydrate formation at the given temperature and thereby sufficiency of the examined feed rate. The invention further relates to an examination system (100) for the in situ determination of rate of feeding an inhibitor into a gas pipeline for preventing hydrate formation, characterized by comprising an industrial scale measuring system (200), comprising: - a gas conduit (10) having
