Appendix 1 CHECK LIST STEAM BLOWING ACTIVITY SYSTEM CODE: SUB-SYSTEM: DATE: TIME : No. ____/____/____ ____:____ DESCRIPTION CHECK YES NO N.A. SAFETY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Dedicated work permit obtained. System under steam blowing is marked on P&ID. System under steam blowing is inspected; ensure piping insulation is as complete as possible before introducing steam. System under steam blowing is properly supported. At the steam blowing point the area involved is barricaded off. Tool box meeting is done. Piping insulation is complete Monitoring of steam blowing is arranged. Around the barricaded area the following signs are posted: “STEAM BLOWING IN PROGRESS” “USE EAR PROTECTION” “NO ENTRY” A warning bell whistles, or sirens are ready to be sounded. All personnel not involved in the steam blowing must leave the restricted area. A HSE Officer is present on the area. All involved personnel must wear PPE (ear protection) Special PPE (___________________________________) are worn. At the discharge point a barrier is installed. All roads involved in the activity are closed. GENERAL Pipe circuit clearly identified Blow out pipe with temporary valve and steam silencer installed at all outlet positions. Check that pipe has been proper installed and supported to avoid any stress on the blown line Steam inlets and outlets determined Temporary bypasses, jumpers, and blind disks installed Equipment intake and discharge disconnected to prevent entry of cleaning medium Orifice plates removed in-line service strainers removed bypass control valves and safety valves removed or blocked instrument connections blanked and protected Space between consecutive open flanges is more than 1/6 of pipe diameter when blowing spring supports and spring hangers are blocked out per manufacturer's 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 instructions equipment near blowing outlets to be protected to prevent damage to fragile devices such as pressure gauge glass STEAM BLOWING OPERATION Flush the system using steam condensate at a velocity of at least 3 m/s (or at the highest velocity limited by MAOP) for a minimum two hours, and drain rapidly under air pressure to remove as much mobile debris as possible. If necessary, isolate sections of the system to achieve this velocity. Crack open inlet valve and start with warming up of line. Valve at the end of header have to be open Open all drain valves on the main header and branches to avoid pipe hammering When condensate is no longer visible at the drain points, open more inlet valve and increase steam speed to remove loose foreign matter and heat up metal quickly at a temperature as much as possible near the operating one; then cut off steam flow and let pipe metal temperature drop below 175° F. Again increase steam flow and temperature and this procedure repeat a several times. Install target plate at the end of header and again open valve to continue with steam blowing several hours. Close inlet valves and after cooling down of header remove silencer with blow out pipe. Reinstall spool and spectacle blind with new gasket and tight stud bolts. ACCEPTANCE CRITERIA Process and utility pipes, steam color at the outlet point is sufficient indication to indicate the completion of internal cleaning. Special service (Process requirement or steam turbine supply) for deep and accurate cleaning fix target plate(copper, aluminium, stainless steel) at the steam blowing outlet point Target plate highly polished and installed when the exhaust steam appears clean Verify plate is placed over fixed support perpendicular to pipe Verify plate dimension to be 0.2 x 0.8 diameter Verify plate is replaced after each blowing Replaced plate shall be marked with number of flow Verify number of marks do not increase during consecutive blowing and in compliance with equipment manufacturer recommendations Remark: SUBCONTRACTOR SIGNATURE PRE-COMMISSIONING SIGNATURE
