supply of uhp (instrument) grade-i, hydrogen gas at heavy water plant, baroda, in departmentally owned carbon steel cylinders of w.c. approx. 47 liter, gas vol. 7.0 nm3 (stp)/cylinder on as and required basis over a period of 02 years with collection of empty cylinder(s) from our site, refilling & safe door delivery of the same back to our site..