Factors Affecting Recommended Service Intervals – Chart A

Instructions: From the drop down menus select the applicable factor that applies to your safety valve. The total weight is shown at the bottom of the Weight column as the Total Factor Weight. Click “Estimate Repair Interval” at the bottom of the page to view your results.

Note: You must make a selection for all factors. If unknown, select a factor of (5).

Factor	Weight	Comments
Unit Type:	Please select a factor... Base Load Drum (3) Peaking Unit Drum (1) Once Through Critical (8)
Operating Gap:	Please select a factor... At Recommended 6% (2) Less Than 6% (10) More Than 6% (0)	Manufacturer's Limit
Physical Location on Unit:	Please select a factor... Inside (2) Outside (4)
Boiler Section:	Please select a factor... Drum (5) SH (8) HRH (2) CRH (1) Main Steam (7)* Water Wall or Roof Outlet (8)* Primary SH (7)*	* Super Critical Only
Electromatic Valve in Use?:	Please select a factor... Yes (0) No (6)
Down Stream of Header Elbow:	Please select a factor... Yes (5) No (0)
Stack Material:	Please select a factor... Steel (10) Stainless Steel (0)
Number of Unit Start up Cycles:	Please select a factor... Less Than 5 (0) 6 to 10 (5) Greater Than 10 (10) Unknown (5)	Since Last Overhaul
Number of Known Valve Actuations:	Please select a factor... None (0) Less Than 5 (5) 6 to 10 (7) Greater Than 10 (10) Unknown (5)
Sonic Flow Vibration:	Please select a factor... Yes (10) No (0) Unknown (5)
Condensate Drains:	Please select a factor... None (8) Yes and Working Freely (0) Yes But Plugged (10) Unknown (5)
Pipe Strain Present on Outlets:	Please select a factor... Cover Vent Yes (8) Outlet Flange (7) None (0) Unknown (5)
Total Factor Weight: