Instrumentation Related MTO
Clause | Details |
MTO-INST-001 | MTO for instrument air supply lines to manifold or individual lines to end user is considered as per project standard. |
MTO-INST-002 | If sizes for control valves and PSV not given in PID, one size smaller is considered for the same. Also mark hold if not given in PID. |
MTO-INST-003 | Minimum pipe size is required for thermowells. Required MTO Taken for the same. |
MTO-INST-004 | MTO for Instrumentation on Standpipe which includes LG, LT instruments, vent and drain, stand pipe taken as per PID/Standard Assembly. |
MTO-INST-005 | MTO for inline instruments is properly considered as per piping-instrument interface diagram. |
MTO-INST-006 | Minimum flange rating for control valve, ESD, MOV, PSV, etc. as well as offline instruments like TG/TT and equipment mounted instruments line LG/LT considered as per instrument requirements. |
MTO-INST-007 | MTO for pressure connections taken as per Instrument Hookup Drawing. |
MTO-INST-008 | FE and Orifice flanges should not be considered in MTO. They are in instrumenatation department scope. |
MTO-INST-009 | Ensure MTO for flanges of RO-Restriction Orifice. |
MTO-INST-010 | Ensure Upstream & Downstream straight run requirement for flow instruments. |
MTO-INST-011 | Ensure MTO is not taken for Tagged Instrument Valves. |
Flanges MTO
Clause | Details |
MTO-FLG-001 | For spec break at flanges, flange in lower rating line should be of same rating as that of connected higher rating flange. |
MTO-FLG-002 | Breakup flanges for removable spools are required for equipments like Heat exchangers, Pumps, Compressors. If not shown in PID, mark them and send comments to Process Department. |
MTO-FLG-003 | Consider breakup flanges for temporary/conical strainers. |
MTO-FLG-004 | Consider breakup flanges for material handling requirements. |
MTO-FLG-005 | Insulating gaskets kit considered if required in specification for flanges joint of dissimilar metals. |
MTO-FLG-006 | Jackscrew flanges are needed for larg bore spacers, blinds or spectacle blinds as per Specification. |
MTO-FLG-007 | Breakup-flanges for prefabricated flanged spools of galvanised lines are considered based on max length of spool that can be galvanised or transported. (Normally 4″ and above). |
MTO-FLG-008 | Breakup flanges for internally lined pipes (PTFE/FBE etc.) considered based on vendor recommendations on max spool length. |
MTO-FLG-009 | Weldolet / reducing tee with a flange considered for large size branch from a galvanised header. (As per spec.) |
MTO-FLG-010 | Extra bolt lengths for flange connections with wafer type valves, PSVs, insulating gaskets, spectacle blind, restriction orifice, conical strainer etc. |