Checklist : General MTO


This checklist covers general points to be checked during MTO Preparation.

SrCheck ItemDone
1Team for MTO has read and working as per guidelines provided Guide Piping Material Take-off.
2P&ID master set for MTO is Maintained, marked up with assumptions/ comments and Highlighted when MTO done.
3Notes in the P&Ids including legends are fully read and accounted for in the MTO as applicable.
4Pipe routing CAD/hand sketches for pipe sizes 2 and above with CS/SS materials and All pipe sizes for exotic materials are prepared and used for manual bulk MTO.MTO for below 2? pipe size with CS/SS material is considered either by preparing sketches or by experience.
5Ensure the following are taken care while preparing MTO file- Area 1 column is filled based on project requirement (e.g. WHP, LQ, etc.).- Area 2 column is filled with respective equipment Tag/Name/Piping system as applicable(e.g. separator, desander, bath heater, drain system, flare system, etc.).- Area 3 column is filled with module Name/ Number if and when modularization is planned(e.g. North module, South Module, etc.) or deck name if platform contains many deck levels.
6Ensure that MTO is not considered for items in P&IDs which are shown within battery limit.(vendor scope/scope by others/future equipments).
7Ensure that during material take-off, no margins (spares) are considered in the quantities and Margins are added after summary level based on the total quantity.
8100 % Contingency is considered in Stud bolt & Gasket MTO.(To be discussed with project manager)
9HOLD on the MTO items due to P&ID holds, Equipment/Packages, Instrumentation, Routing finalization, control valves, PSVs, etc. shall be identified.
10MTO for all SS/DSS/Exotic materials and higher sizes for other materials (10 and above) shall be reviewed by concerned Area Engineer/Lead engineer.
11For pipe class/spec break at flanges, ensure to consider that mating flange rating of lower class line shall be same as that of higher class line.
12For Pipe specs (e.g. Galvanized class) having both threading & butt weld sizes, ensure that threadolet is used for threading size branch and weldolet/reducing tee with flange is considered for butt weld size.
13Break-up flanges are considered for galvanized lines (4 and above or as specified in pipe class) with prefabricated flanged spools, based on the limitation of the pipe spool that can be galvanized/transported.
14Break-up flanges for the removable spools are considered for equipment like Compressors, exchangers, pumps, etc. If P&IDs are not shown then it shall be commented and sent to process for update.
15Break-up flanges are considered for internally lined (FBE/PTFE etc.) piping, based on the spool dimensions as per vendor recommendation that can be lined, Branch connections are considered based on piping specification requirements.
16Break-up flanges for temporary/conical strainers are considered.
17Break-up flanges are considered for requirements due to material handling.
18Special requirement for valves (reduced bore, full bore, extended bonnet, extended stem, metal seated, soft seated, extended spindle, special trim, etc.) is ensured in MTO.
19Additional quantity as specified in client requirement is considered for loose supply material (e.g. Christmas tree hook-up spool, etc.)
20Offshore hook up spools with flanges/blinds are considered for X MAS tree and deck modularization, overboard lines and lines terminated at boat landing.
21Ensure that size reduction used for Concentric/Eccentric reducer are as per ASME B16.9 standard. The same is indicated in P&IDs mark-up to process.
22For estimation purpose sizes up to 4 pipe lengths shall not be deducted for dimensions of valve and fittings and the same are deducted for sizes 6 and above.
23For pipe classes where SW/Threaded fittings are specified, sufficient quantity of full couplings/unions as applicable are considered.
24MTO for equipment trims are taken. Ensure that line number given for trim lines based on equipment tag number and relevant piping specification.
25MTO for utility stations is considered. Quantity of hoses is considered as per project specification.
26MTO for instrument air supply lines to manifold or individual lines to end user is considered as per project philosophy.
27MTO for safety Equipments piping like fire hydrant, fire monitor, safety shower, eye wash, etc. is considered.
28MTO for fire water rings, foam and deluge piping is considered.
29Ensure that MTO covers all lines as per P&IDs/Line List.
30Ensure that branch fittings are considered as per the branch table in PMS.
31MTO is taken for deck drain funnel piping (open drain) network.
32Rodding point MTO is taken for Drain header where required.
33MTO is considered for GRE piping and branch connections based on vendors piping specification requirements.
34MTO is considered for all items such as level Instruments (LG,LT), Instrument vent & drain, Sample connection, stand pipes, etc. as detailed in legend P&ID/ Construction standard for assemblies.
35MTO for inline instruments is properly considered as per piping-instrument interface diagram. 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.
36Minimum requirement of flange and valve rating for pressure instrument connections is considered as per client standard/Construction standard.
37Requirement of minimum pipe size for thermowell type temperature instrument are considered in MTO
38Sizes of control valves and PSVs are considered as one size less than the line size (if the sizes are not indicated in the P&IDs).
39Ensure FE & orifice flanges are not considered in piping MTO.Companion flanges for restriction orifice plate (RO) shall be part of Piping MTO.
40Upstream & Downstream straight run requirement for flow instruments is considered in MTO.
41In case of tubing spec, ensure that compression fit is considered in end connection.
42Electrical tracing MTO quantity shall not be calculated by Piping. Isometrics for the electrically traced lines shall be issued to electrical department for calculating tracing MTO.
43Ensure branch fittings and flanges are considered for intrusive type PIG signalers and MTO not considered for Non-intrusive type PIG signalers.
44Ensure MTO is not taken for instrument valves (Tagged Valves).
45Piping Special items (SP items) like different type of strainers, steam traps, hose and hose couplings, injection quills, flame arrestor, access fitting for corrosion coupons/monitor, corrosion coupon/ probe retrieval tool kit, valve interlocks, sight glass, bird screen, special check valve etc. are considered in SP item list and not duplicated in MTO.
46For Hub end valves , mating hub, hub clamp with fasteners & Seal ring are considered in MTO.
47Insulating gaskets kit are taken at dissimilar metal flanged joints as required by specifications and P&IDs.
48Jackscrew flanges are considered at large bore spacers/blinds or spectacle blinds based on project specification.
49MTO for expansion loops for high temperature lines, long straight lines(pipes on bridge), etc. is considered as per input from stress group.
50Lateral 45 deg (Laterolet & lateral tee) fitting requirement is considered for PSV relief header & open deck drain connection as per P&ID/ project requirements.
51Deck drain box/funnel are considered in piping specialty item in consultation with structural.
52Insulation type (Hot, Cold, Electrical tracing, acoustic, etc.) as per P&IDs. /line list is considered.
53Requirement of target tee/tee with end cap for change in direction of line in case of impure fluids (Containing sand, etc.) is considered.
54Topside Pipeline MTO (Pipe, hot induction bends, flanges, etc.) is taken and forwarded to pipeline discipline if design code is ASME B31.4, B31.8 or DNV & pipeline scope exist for Bid.
55For brown field projects, re-usable items identified in P&IDs and are not considered in MTO.
56Number of hydro test vent & drain & MTO are considered based on the sketches prepared for MTO and identified separately. For below 2? pipe sizes with CS/SS materials, ensure that 10 % of line count is considered for hydrotest test vent & drain (i.e. 5% each) in MTO/material cost If sketches are not prepared.
57Hydro test Materials like temporary spool materials, blind flanges, gasket, etc. are considered, if in scope.
58Pipe support MTO including pipe clamps, shoes, U-bolts, special supports, etc. are considered.
59MTO for wear pads, reinforcement pad, trunnions, etc. are considered.
60Extra bolt lengths for flange connection with wafer type valves, PSVs, insulating gaskets, restriction orifice, spectacle blind, conical strainer etc. are considered.