In these last years, DES had manufactured seamless steel tube, spiral welded tube and cast tube hydrostatic testing machine set and also for large calibre welded tube manufacturing complete set equipments. In open up the great construction of West-North, DES had supplied the National key-point project "West Gas East Transport" 5 set pipeline construction tube manufacturing equipments:
 20MN steel tube hydro-pressure testing machine set for Liaoyang petroleum steel tube mill
 20MN steel tube hydro-pressure testing machine set for  Baoji petroleum steel tube mill
 508-1420 spiral welded tube manufacturing machine set for Liaoyang petroleum steel tube mill
 508-1420 spiral welded tube manufacturing machine set for Baoji petroleum steel tube mill
 508-2200 spiral welded tube manufacturing machine set for Huabei petroleum steel tube mill
"West Gas East Transport" spiral welded tube engineering is about 4200km  long, and in addition with the other similar 8 lines of pipeline projects which are ready for construction have a length of more than 40000km, need a great quantity of high quality spiral welded tubes. So large calibre welded tube manufacturing complete set equipment has a very good market in the future.

2.  20MN Steel Tube Hydrostatic Testing Machine Set
 20MNSteel Tube Hydrostatic Testing Machine Set is mainly used for above mentioned spiral welded tube finished products. Steel tube inspection is done on the highest testing pressure of 25.4MPa, when stabilized within 5-20 sec, no seepage and guarantee the use of steel tube. Production capacity for 1420-6pcs, 508-20pcs