I would structure this in the following way .
1. Current revenue stream :
a. Get longer term contracts from the current suppliers . ( build relationships with current customers )
b. Marketing about the service and quality in industrial journals / directly going to maufacturing comapnies and offering discounts on first service.
New Revenue Stream :
a. Explore New markets
b. Explore new suppliers in the same markets
c. Go into online video tutorial for self maintenance of pipelines ( users will have to subsribe for the videos )
d. ) Enter into manufacturing pipes as well ( with all the experience gained over the years of maintaining the pipes )
I would prioritize both a and b in current revenue streams and b and c in new revenue streams looking at the feasibility of these ideas .