piping isometric checklist

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Piping Isometric checklist


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Drawing Revision Number/Letter and Description

Drawing Title Block Information

Drawing Signatures Back Circles Drawing Notes Drawing Attributes Spelling and Abbreviations North Arrow Project Specific Requirements PIPING SYSTEM INFORMATION CHECK

System to P&ID Check

Equipment Location, Description, Tag Number

Equipment Nozzle Location, Tag Number, and Data

Piping Connection to Equipment Nozzle

Flow Direction Arrow

Completeness (All required dimensions, notes, information, details required forconstruction)

Project Design Criteria Documents

Valve and In-Line Components

Valve, Flow Element, and In-Line Components Installation Requirements

Vents and Drains

Minimum Pipe Spool Lengths

Separation Distances for Branches

Instrument Connection Orientation and Access

Insulation and Insulation Support Lugs

Heat Tracing

Pipe Penetration Symbols and/or callout of core drilled openings



Pipe Supports and Welded Attachments

Material List on Isometrics

Insulating Flange Kits

Dissimilar Metal Welds

Dissimilar pipe and/or component wall thickness


Interference Check

Thermal Analysis

Hazardous Areas

Plant Personnel Access, Construction Access, Maintenance Areas, and Safety

Pump and Equipment Requirements

System Discharge Points

Underground Pipe Burial Depth

Pipe Lanes

Structural Gusset Plates

Circulating Water Branch Component Reinforcement Plate clearance

Underground Potable Water and Waste Water Separation

HDPE Pipe Fitting Separation and Butterfly Valves

Clearance from vertical structural columns and walls

Olet Branch Dimensions

Miscellaneous Items for Checking List



Holds list

Remark Check that the drawing number is in accordance with the project numbering system, client numbering system Check that the drawing revision number/letter is correct in the title block and revision description block according to project revision numbering system. Check that the revision description in the revision block describes the purpose for the drawing issue or changes. Check that the text in the drawing title block is correct in accordance with the project standards Deliverable Drawings. - Project Description - Drawing Type Description (Piping Isometric, Underground Piping Isometric, Small Bore Piping Isometric, Analyzed Small Bore Piping, etc) - Piping System Description - Scale Check that drawing signatures arethat back circles are place around For revised drawings only, check correct in the title block. revised areas to identify changes since the previous drawing issue. Check that back circles from previous revisions have been removed Check that the line graphic and text attributes meet the requirements of the Project Cadd Specification.

Check that the pipe system matches the approved system P&ID including comments found on the projects Master Set of P&IDs. The checker is responsible that the piping drawing and the P&ID are in agreement for the following: - Pipe Line Number - Pipe Sizes - Pipe Line Specifications and locations of Line Spec changes within the pipeline. - Pipe Insulation Class - Branch and Component sequence - Equipment Tag Numbers and Descriptions - Component Tag Numbers - Flow direction - Heat Tracing limits, type, and thickness Check the coordinate (n/s, e/w, and elevation) locations of all equipment to which the pipe system is connected in the model. The location shall match the general arrangement, equipment setting plan, and civil/structural drawings. Check that the equipment description and tag number match the P&ID and Mechanical Equipment List. Check the equipment model nozzle location, size, connection end preparation, flange rating, pipe schedule are in accordance with the latest equipment vendor drawing. - Check that nozzle information on piping drawing is correct - Butt Weld nozzles shall include the nozzle pipe schedule or wall thickness Check the pipe connecting to the equipment nozzle matches the nozzle attributes and is compatible. - Flat Faced or Raised Faced Flanges - Butt Weld Nozzles requires matching material and pipe wall thickness. Identify dissimilar metal welds and wall thickness between nozzles and pipe. - Non-USA vendor may provide nozzles that do not comply with ASME B16.25 weld bevel standards. Identify locations of any pipe joint that requires a bevel different than the ASME standard. Check that each pipe line contains one flow direction arrow. Each sheet of a piping isometric shall contain a minimum of one flow direction arrow.

Check that all dimensions, notes, information, and details that are required for the construction and installation of the piping are included. - Compliance with System Design Guides. Check that the piping system is designed in accordance with the Mechanical Design Department specific system design guides. Check that the piping system is designed in compliance with project/client design criteria documents. Check all valves and in-line pipe components (flow elements, expansions joints, orifice plates, restricting orifices, etc) end to end dimensions and connection attributes from approved vendor drawings. Check that the connection size, type and schedule match the attributes of the pipe. Check all valve actuators for correct size, orientation and that they are accessible for operation and maintenance. - Standard end to end dimensions per ASME/ANSI B16.10 for valves 600 lb class and below may be approved without approved vendor drawings for gates, globe, and check valves. All other valves shall be on hold until approved vendor drawings are available. - Butterfly, control, ball, plug, and relief valve end to end dimensions do not conform to end to end standards and shall be on hold until approved vendor drawings are available. - Identify dissimilar metal welds and wall thickness between component and pipe. - Check that chain wheel operators are provided on non accessible valves. Check vendor drawings and installation instructions for installation requirements of valves, flow elements and in-line components within the pipeline. - Straight pipe upstream and downstream requirements - Valve stem orientation (especially butterfly valves) - Clearances for valve maintenance and disassembly. - Lugged butterfly valves shall be noted on drawings for proper bolting procurement. - No gaskets required at low pressure butterfly valves and expansions joints. - Flat face flanges required at flanged expansion joints - Flat face flanges are required at cast iron equipment flanges - Flow element upstream and downstream straight pipe requirements according to the Control System Engineer requirements. Check quantity and location of vents and drains. Check that all vent and drain connections reference the correct standard detail number.

Check that there are adequate pipe spool lengths between pipe line components. Use the following as a guide. Large Bore Butt Weld: Minimum spool length equivalent to the length of a butt weld reducer. Small Bore Socket Weld: Minimum exposed pipe length between socket weld components ends shall be 2. Check that there is adequate separation distance between pipe branches and adequate separation distances between branches and pipe line ends or components. Check that instrument connections that require access are accessible and that the orientation on the pipe is correct. Check for proper connection type and size. Check that all Instrument connections reference the correct standard detail number, and there are sufficient clearances for element removal from pipe. - Temperature connections shall be located downstream of pressure connections. - Temperature thermowells cannot be installed in pipes smaller than 3. Check insulation requirements to Project insulation class codes and thickness. Add insulation support lugs on vertical runs of alloy pipe. Check that piping is Heat Traced as identified on the system P&ID and in accordance with the Project Heat Tracing Criteria. Check that all concrete floor, platform grating, wall, and grade penetrations are indicated and labeled on piping isometrics. Callout core drilled openings in existing walls when required. Check that water stops are provided on underground piping at floor and wall penetrations. Check that pipe systems that require slope have the proper minimum slope and the correct slope direction. For hot piping verify pipe does not reverse slope in hot position. Check that pipe supports are shown when required and locations, quantity, and tag numbers have been review and approved by the Piping Engineering department. Check that shop welded pipe support attachment details are provided on alloy piping for shop welding before shop stress relieving. Check that all pipe and pipe component material descriptions in the isometric drawing material list matches the engineering pipe line specification.

Check that insulating flange kits are identified on aboveground piping systems connecting to underground pipe systems where required by the pipeline specification. Check that dissimilar metal


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