Technical Specification

Fusible Plug is a fitting used in Steam Boilers to enhance the safety during operation. It’s working depends upon the water level in the Boiler shell. A fusible Plug is a threaded metallic cylindrical object, with a tapered hole in it which goes through its entire length.

NOMINAL

Size

A B
15mm(1/2’’) 1/2 ‘’ BSPT 56
20mm(3/4’’) 3/4’’ BSPT 56
25mm (1’’) 1’’ BSPT 70
32mm(1-1/4’’) 1-1/4’’ BSPT 83
40mm(1-1/2’’) 1-1/2’’ BSPT 89
50mm (2’’) 2’’ BSPT 100
PART No PART NAME MATERIAL SPECIFICATION
1 PLUG BRONZE IBR282(a) lV  GR.B
2 FUSIBLE ALLOY LEAD TIN ALLOY IBR333
3 CONE BRONZE IBR282(a) lV  GR.B
4 BODY BRONZE IBR282(a) lV  GR.B

STEAM WORKING PRESSURE     :           17.58 Kg/Cm2g (250psig)

HYDRAULIC TEST PRESSURE       :           35.16 Kg/Cm2g (500psig)