PandID Sheets of a Process Plant

7/27/2019 PandID Sheets of a Process Plant

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P&ID sheets of a process plant

Basic theory

and

Utilization of P&ID data


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P&ID preliminaries

Piping and instrumentation digrams is designers road map whichshows all the equipment,pumps,valves,instrumentation,and otherpiping items in sequence for proper system function.

The primary element of a piping design is the piping and

instrumentation diagram (P&ID).

Both the process engineer and the instrument and controls engineerprovide design information

P&ID shows all of piping including the physical sequence of

branches, reducers, valves, equipment, instrumentation, etc.

The P&IDs are used to operate the process system.


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A P&ID should include

Instrumentation and designations

Mechanical equipment with names and numbers

All valves and their identifications

Process piping, sizes and identification Miscellaneous - vents, drains, special fittings,sampling lines, reducers, increasers andswagers

Permanent start-up and flush lines

Flow directions

Interconnections references


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A P&ID should include (continued).

Control inputs and outputs, interlocks

Interfaces for class changes

Seismic category

Quality level

Computer control system input

Vendor and contractor interfaces

Identification of components andsubsystems delivered by others


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An example of a Process Flow Diagram (PFD)

P&ID for this PFD


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P&ID for this PFD


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P&ID should not include :-

Instrument root valves control relays

manual switches

equipment rating or capacity

primary instrument tubing and valves

pressure temperature and flow data

elbow, tees and similar standard fittings

extensive explanatory notes

& G


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P&ID Guidelines The P&ID should utilize industry recognized symbols

and abbreviations.

A schedule should be presented on the P&ID orother referenced drawing, identifying all symbols,abbreviations and instrumentation functionidentifiers.

System directional flow arrows should be utilized onthe P&ID.

Design flow quantities and temperature and pressureset points are to be presented on the P&ID orcorresponding schedule.

P&ID components are to be labeled with unique tagsor identifiers.

Piping system lines are to be labeled at regularintervals to better facilitate the following of the lines

on the drawing. Where P&ID lines extend tosubse uent drawin s.

P&ID Guidelines (Continued)


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P&ID Guidelines (Continued)

The P&ID may be used to present line sizes andtype information, insulating requirements, heattracing requirements, etc. where scale or complexity

prohibit such presentation on the plans. The HVAC P&ID is intended to depict the Facilities

Services systems including the distribution andgeneration of all HVAC water and steam systems.

All heat addition and rejection components are to beincorporated into the P&ID as well as heatexchanger components.

Terminal devices or multiple air handling equipmentheat exchangers are appropriately presented intypical form to communicate expectations forrepetitive component types.

Instrument identifiers are intended to be crossreferenced to the Sequence of operation

descriptions presented on the drawings or thes ecifications.


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P&ID data is used for - Design of plot plan and plant layout.

For counting bill of materials. For piping specifications

For pipe connecter and piperack specifications

For detail piping layout. For pipe stress analysis.

Material take-off (MTO) and bill of quantity

(BOQ). Checking of isometrics and piping layouts.

Checking regulation rules and practices.


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What is Material Take Off (MTO)?

What is Bill of Material (BOM)?

What is Bill of Quantity (BOQ)?


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1. Material takeoff( MTO):-

A Material Take off (MTO) is the process ofanalyzing the drawings and determining all

the materials required to accomplish the

design. We then use the material takeoff to

create a Bill of Materials. Inspection does not

aid in creating a Bill of Material. Procurement

and requisition are activities that occur after

the Bill of Materials is complete.


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MTO= Material Take Off

This can be a noun and a verb. The MTO is the

finished product of a work activity (i.e.: Let me

see the Material Take Off). In this case the

"MTO" is a rather thick stack of computer print-

outs that reflect all of the (piping) material

requirements for the Area, Unit or total jobdepending on how the "MTO" was executed.

MTO is also the activity itself (i.e.: Okay lets

start the Material Take Off). In this case the

"MTO" is the action of doing a mass download ofall the material from the computer models

design data base.


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2. Bill of Materials (BOM):-

A Bill of Material (B.O.M.) is a hierarchical list

of materials (components, subassemblies,ingredients.) required to produce an item,showing the quantity of each required item.Other information such as scrap factors mayalso be included in the BOM for use inmaterials planning and costing.

An engineering BOM represents theassembly structure implied by the parts listson drawings and drawing tree structure. Amanufacturing BOM represents the assemblybuild-up the way a product is manufactured.


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Bill of material reflecting the product as

designed by engineering, referred to as theas-designed" bill of material.

BOM= Bill of Material

This is a noun. A Bill of Material is (normally)

the listing of material required for one pipeline or segment thereof, such as an Isometric.

Each Isometric should have a BOM attached.


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3. Bill of Quantities ( BOQ):-

Bill of quantities is used as a form of cost

planning and mapping to monitor andcontrol the construction cost during the

execution or post-contract period of

construction. These documents originated historically as

non-contractual measurements, taken off

drawings to assist tenderers in quotinglump sum prices.


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Bills of quantities are drawn up and specified by a costprofessional called a quantity surveyor and prepared in

advance to take into account the works required for aproject, and then later used as a tender document toacquire bidding from the contractors who would beinterested in winning the job.

There are different styles of bills of quantities, mainly the

Elemental BOQ and Trade Bills. BOQ= Bill of Quantities

This would be a noun. I have never used this term.Where I worked we used the term "Material Summaries."These documents were the result of taking all the

material collected in the "MTO" and after sorting it bytype, material, size, etc. it is printed out in a form thatwould be forwarded to the purchasing department for theactual purchase.


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Bill of Material (BOM) Mainly Contains:-

SR No Tag No Descriptio

n

Size Quantity


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Tag No is given to the Mainly to the :-

Pipes

Valves

All types of fittings

Gasket material used

Type of bolt and nut used

All types of valves


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Description Mainly Contains:-

Standard used (i.e. ASME ,BIS,DIN etc)

Material of Construction (MOC)

Schedule No

Grade of Material

Pressure-temperature Rating Class

Quantity:- Quantity gives the number of items .


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Example :-

Prepare the bill of Material for following

isometric Drawing ?

Documents

PandID Sheets of a Process Plant