NOVELTY - Method of accommodating a reduction in production capacity of reactors in a multi-reactor assembly, for the production of hydrocarbon products from syngas such as the Fischer-Tropsch process (provided by a syngas manufacturing facility and provided to an entry stream system), providing syngas to the reactors and having an exit stream system taking hydrocarbon products from the reactors, comprises: redistributing the syngas from the reactors to other reactors; and increasing the temperature in the other reactors to take over the reduction in production capacity of the reactors.    USE - The method is useful for two or more reactors operating in parallel, preferably eight or more. The method useful for a multi-stage hydrocarbon production process. The method is useful for a multi-stage hydrocarbon production process, each stage having one or more, preferably two or more reactors to obtain hydrocarbon products e.g. LPG, naphtha, kerosene, gas oil, lube oil, detergent feedstock, drilling fluids and solvents (all claimed). The process, method and/or assembly are useful to maintain a regular or steady supply of syngas in the light of any reduction in production capacity e.g. physical capacity or chemical capacity and/or efficiency of reactors.    ADVANTAGE - The reactor is individually operated i.e. it has its own independent controls with respect to feed, temperature control etc. The pressure in all reactors will usually be about the same. The method provides the ability to maintain the balance of energy and/or chemical outputs of parts. The method adapts to maintain high efficiency of the overall multi-reactor assembly, whilst maintaining optimal production of syngas. The method is suitable for all types of reactor e.g. multi-tubular fixed-bed reactors and slurry-bed reactors.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a multi-reactor assembly for the production of hydrocarbon products from syngas, where the assembly comprising two reactors, a syngas entry stream system and a hydrocarbon products exit system, which includes means to redistribute syngas from reactors to other reactors and to increase the temperature of the other reactors, following any reduction in production capacity in the reactors, especially a multi-reactor assembly having at least four reactors, preferably eight reactors;    (2) multi-reactor assembly adapted to provide a wholly or substantially constant input of syngas from the syngas manufacturing facility and a wholly or substantially constant output of hydrocarbon products from the assembly especially for a Fischer-Tropsch process;    (3) a process for the production of hydrocarbon products from syngas in a multi-reactor assembly having at least two reactors, especially the Fischer-Tropsch process, the reactors having an entry stream system providing syngas to the reactors, and an exit stream system taking at least hydrocarbon products from the reactors, where following a reduction in production capacity in reactors, syngas is redistributed from the reactors to other reactors, and the temperature in the other reactors is increased to partially take over the reduction in production capacity of the reactors, optionally followed by hydroconversion e.g. hydrogenation, hydroisomerisation, hydrocracking and/or catalytic dewaxing and distillation to obtain hydrocarbon products e.g. LPG, naphtha, kerosene, gas oil, lube oil, detergent feedstock, drilling fluids and solvents.