Modular heat recovery steam generator system for rapid installation

A method of assembling a modular heat recovery steam generator (mHRSG), comprising the steps of:

• providing a first boiler module, the first boiler module comprising a plurality of pipes having at least one pipe terminating in a flanged end;
• providing a second boiler module;
• operatively coupling the first boiler module and the second boiler module;
• providing a main stack,
• operatively coupling the main stack to the second boiler module using a plurality of bolt structures;
• providing a first piping deck, the first piping deck being a modular component comprising a plurality of pipes, the plurality of pipes of the first piping deck has at least one pipe terminating in a flanged end, and a second piping deck, the second piping deck being a modular component comprising a plurality of pipes;
• securing the first piping deck to an upper side of the first boiler module;
• operatively coupling the plurality of pipes of the first piping deck to the first boiler module by securing the flanged end of the at least one pipe terminating in a flanged end of the first piping deck to the flanged end of the at least one pipe terminating in a flanged end of the first boiler module using a plurality of bolt structures;
• and
• operatively coupling the plurality of pipes of the second piping deck to the second boiler module using a plurality of bolt structures.