tender for provision of fire fighting services at nstl technical area under age (i) r&d nstl, visakhapatnam; 1 supply and fixing hose pipe of 63mm dia 15 mtr long re-inforced rubber lined (rrl), synthetic fible, circular woven jacketed, hose tested to working pressure 12 kg/sq cm, burst pressure 36 kg/sq cm including gun metal male and female instantaneous type coupling approved by the dept complete in all respects.hose shall conform to is:636 type-ii and coupling heavy quality conforming to is : 903-1985 with isi certification all as specified and as directed. 2 supply and fix 80mm bore hand operated butterfly valve of pressure not less than 15 kg/ sqcm with complete set complete all as specified and as directed. 3 providing and fixing standard short size gun metal branch pipe with gun metal nozzle 16mm dia outlet with standard male instantaneous spring lock type 63mm dia coupling.branch pipe and nozzle shall confirm is : 903-1985 all as specified and as directed.