Considering structural features and requirements of underwater pump discharge housing

middle-temperature wax was used for making sol silicate shell. Through adopting some technological

such as placing feeding ring on lacy flange

adjusting the flange’s position and height of ingate located inside housing

setting de-waxing holes at crack-easy location

using ceramic core in cavity of shell

re-pouring riser after bottom pouring as well as covering top surfaces of downsprue and riser with asbestos after pouring

the quality of the investment castings fully meet the requirement.