procurement of thin walled piping of ibr and non ibr systems procurement of thin walled piping of ibr and non ibr systems (with detailed engineering by supplier) for mel mahan project , aux steam system- ibr , aux steam system for mel mahan unit 1 (ibr) , aux steam system for mel mahan unit 2 (ibr) , aux steam system- non ibr , aux steam system for mel mahan unit 1 (non ibr) , aux steam system for mel mahan unit 2 (non ibr) , condensate system- non ibr , condensate system for mel mahan unit 1 (non ibr) , condensate system for mel mahan unit 2 (non ibr) , drain & vent piping- non ibr , drain & vent piping for mel mahan unit 1 (non ibr) , drain & vent piping for mel mahan unit 2 (non ibr) , extraction system- ibr , extraction system for mel mahan unit 1 (ibr) , extraction system for mel mahan unit 2 (ibr) , heaters drain piping- non ibr , heaters drain piping for mel mahan unit 1 (non ibr) , heaters drain piping for mel mahan unit 2 (non ibr) , sg integral piping system- ibr , sg integral piping system for mel mahan unit 1 (ibr) , sg integral piping system for mel mahan unit 2 (ibr) , sg integral piping system- non ibr , sg integral piping system for mel mahan unit 1 (non ibr) , sg integral piping system for mel mahan unit 2 (non ibr) , spray water / feed water piping- ibr , spray water / feed water piping for mel mahan unit 1 (ibr) , spray water / feed water piping for mel mahan unit 2 (ibr) , spray water / feed water piping- non ibr , spray water / feed water piping for mel mahan unit 1 (non ibr) , spray water / feed water piping for mel mahan unit 2 (non ibr)