Table of Contents
| Section | Title | Page |
| Purpose | 2 | |
| Scope | 2 | |
| Related Documents | 2 | |
| Definitions | 2 | |
| Overview | 4 | |
| Tagging Pipe Supports | 5 | |
| Pipe Support Modeling | 6 | |
| Site Supports and Field Supported Lines | 7 | |
| Piping and Equipment Arrangements | 8 | |
| Isometric View Drawings | 8 | |
| Pipe Support Index | 8 | |
| Special Pipe Support Drawings | 10 | |
| Change Log | 11 | |
| Alternate Method for Specifying Pipe Supports on Skids | 12 | |
| Examples | 14 | |
| Sample Pipe Support Index Entries for Examples in Appendix B | 17 |
1. PURPOSE
1.1 This engineering standard defines a pipe support work practice to be used to produce piping CAD models and design packages for projects and products that are consistent, reusable, cost effective, and support concurrent global engineering across all Engineering and Manufacturing Teams.
1.2 This standard defines the final output of various work procedures. Pipe Support Tagging on piping isometric drawings and General Arrangement Orthographic or Isometric View drawings. Minimum extent of pipe support modeling. Pipe support index and special support drawing organization. Welded Attachment support drawings and summary.
2. scope
2.1 This standard applies to “Yard Piping” and “Skid Piping” applications in all plants designed by Air Products except as identified in paragraphs 2.2 and 2.3.
2.2 Piping within sealed cryogenic structures such as cold boxes, column cans, transition or crossover structures, and valve or pump boxes is excluded.
2.3 This standard does not apply if it conflicts with customer requirements on a project-specific basis, or when retrofit work is being done in an existing plant using existing drawings.
2.4 This standard applies to projects that use Support Modeler for modeling supports as well as projects that use PDS to model supports.
3. related documents
3.1 Air Products Engineering Documents 3PI42001 Worldwide Standard Pipe Supports – Yard 3PI42002 Worldwide Welded Attachment Pipe Supports 3PI42003 Worldwide Special Pipe Supports – Yard 4WPI-AWS002 Construction of Site Pipe Supports (Type SSW) and Field-Supported Piping
4. Definitions
4.1 AP-Anchor symbol is a shape associated with a pipe support that shows in the PDS model and on hidden-line drawings such as General Arrangements or Isometric Views of the area. It is not the mark that is used on extracted isometric piping drawings. (When using PDS to model supports, every pipe support shall be tagged with an AP-Anchor symbol.)
4.2 Area: See Master CAD/CTR Work Package Name.
4.3 Master CAD/CTR Work Package Name refers to the “area” name given to each CAD model area in a CAD project. It is also assigned to Product or Engineered System project files. (Refer to the CAD Systems web page “CADSystems > Plant Design System > Design Tasks > CTR List”.)
4.4 Modeling a support can be accomplished in PDS or in Support Modeler. Support Modeler is preferred. PDS methods should be used with legacy projects (designed before Support Modeler), or if the Support Modeler program is not available.
4.4.1 Modeling a support in PDS is done by adding graphical elements to the PDS model that represent the support in the model. The purpose is not to create an “exact” model, but to show the support pictorially in the model and on hidden-line orthographic drawings, and to allow clash detection (visual or using PDS). Since the resulting support model is not intelligent, the Pipe Support Index must be created manually when PDS is used for modeling supports.
4.4.2 Modeling a support in Support Modeler creates an “intelligent” model and produces pipe support models that are very accurate. The data from support modeler is used to populate the pipe support index, and can be used to create Bills of Material for pipe supports.
4.5 Rest, when shown on an isometric without a pipe support number, is a Pipe Support Tag used to indicate that a pipe is resting on (and therefore being supported by) an existing structure or pipe support. There is no hardware or structure that needs to be detailed for this support. Examples include a pipe that rests on pipe rack steel or a pipe that rests on a pipe support called out on a different pipe.
4.6 Site Supports are supports that are to be designed and fabricated by the field contractor using 4WPI‑AWS002. They may be single supports that are tagged on an isometric, or an entire line may be labeled “Field Supported according to 4WPI-AWS002.”
4.7 Skid is an assembly of piping and equipment that is fabricated in a shop on a framework that allows the entire assembly to be shipped from the shop to a plant site.
4.8 Special Pipe Supports are supports that are not one of the Worldwide Standard Pipe Supports. These supports require an individual drawing or specification to detail the support. These drawings can be created from Special Support templates, a CAD drawing, a Support Modeler drawing, spring support design software, and so forth. Complex support drawing requirements should be referred to the Civil/Structural group (see “Structural Supports in paragraph 5.11).
4.9 Special Support Templates, described by 3PI42003, have standard configurations and variable dimensions and/or member sizes that may be used to create Special Pipe Support drawings. After engineering calculations are done, the template is used to detail the specific dimensions and structural members to be used to fabricate the support.
4.9.1 Special support templates are stored in the STAC Cabinets area: “CABINETSSTANDARDSSTANDARD DRAWINGSAIR PRODUCTSPIPINGSPECIAL SUPPORT TEMPLATES”
4.10 Spring supports are pipe supports that use variable springs (that is, a standard coil spring) or constant-effort supports. Drawings for springs are generally created by using the LICAD program from Lisega (or the design program provided by another spring vendor).
4.11 Structural supports are pipe supports that are drawn by the civil/structural group. They are generally larger supports that are beyond the scope of the Standard Pipe Supports or the special pipe support templates used by the piping design or pipe support groups. The drawings are assigned civil/structural drawing numbers.
4.12 Worldwide Standard Pipe Supports are supports that have standard configurations and can be purchased or fabricated by information provided by the Support Code and the Standard Pipe Support drawing (see 3PI42001).
4.12.1 311708A are the Worldwide Standard Pipe Supports. These supports use metric dimensions and shall be used for most projects.
4.12.2 311709A are the Worldwide Standard Pipe Supports converted to imperial dimensions. They shall only be used on projects where Air Products is contractually required to use imperial dimensions for all drawings. Not all of the 311708A drawings have been converted to imperial dimensions at the time of this publication. Contact the Subject Matter Expert of this standard in the event that a Standard Pipe Support drawing is required to be converted to imperial dimensions.
4.12.3 Standard Pipe Support drawings shall not be modified in any way for use on a particular project. If a Standard Pipe Support parameter must be modified, a special pipe support drawing must be created.
4.13 Worldwide Welded Attachment Pipe Supports are supports that have standard configurations but variable dimensions and member sizes and are welded directly to the pipe as part of the prefabricated pipe package (see 3PI42002).
5. OVERview
5.1 Design and specification of Pipe Supports and Welded Attachment Supports is collaboration between the Piping Design Group and Piping Stress Group (and the Civil/Structural Group when required).
5.2 Responsibilities: Piping Design creates the pipe support index in STAC (refer to paragraph 5.4). Piping Design creates the Welded Attachment drawings in the PDS project working directory in accordance with 3PI42002. Piping Designer locates and specifies pipe supports as they lay out the piping system. This “first pass” saves much time for the stress engineer later on who would need to re-create the designer’s thought process to locate and specify supports. Piping designer populates the support index manually, or imports the data from Support Modeler. Stress engineer is responsible for qualifying the support chosen by the designer, modifying it, eliminating it, or adding new supports as required during the analysis phase. Since the stress engineer has the loads on a support at hand, it is most efficient for them to do the qualification of the support with simple calculations or by comparing to tabulated allowable loads. More complex situations are forwarded to the Structural Engineering group. Stress Engineer is responsible for the final content of the Pipe Support Index and Welded Attachment Summary. Other work flows are possible, but the above minimizes handoffs, and has “the right person doing the right job at the right time”.
5.3 Templates for pipe support index documents: TEMPLATE MECH 0015 PIPE SUPPORT INDEX (use with 311708A metric pipe supports.) TEMPLATE MECH 0082 IMPERIAL PIPE SUPPORT INDEX (use with 311709A imperial pipe supports. This index includes a conversion button to convert metric dimensions from Support Modeler to imperial dimensions.)
5.4 Always create a new index using the STAC template. Do not copy an existing index in STAC to create a new index in a different project unless the content of the index actually is being re-used (without significant modification). Never use a template that was stored on an individual’s hard drive, as it is probably outdated.
5.4.1 Exceptions to the above would be for a job-specific, customer driven requirement for a specific pipe support index format (example: LNG Heat Exchanger projects).
5.5 Final document approvals:
5.5.1 The Welded Attachment drawings are approved with the piping isometric package (Stress Engineer approves the “PRFB” Large Bore Piping Isometric Index and/or the “LBSB” Large Bore/Small Bore Piping Isometric Index in STAC.)
5.5.2 The Pipe Support Index and Special Pipe Support Drawings are each issued for approval in STAC. The Stress Engineer is either an approver, or is the initiator of the approval. Piping Design may be the issuer or is designated as Checker.
6. Tagging pipe Supports
6.1 Pipe Support Tags shall consist of two or three lines. Welded Attachment and REST support tags are only one line. The third line is optional and is generally used to label a Shipping Support (refer to paragraph 6.1.3)
6.1.1 First Line = Pipe Support Tag Number. Tags shall be in one of the following formats:- WA-YYY-xxx (Welded Attachment) – PS-YYY-xxx (Pipe Support) – SSWzz-YYY-xxx (Site Support – refer to Section 8) – REST (a rest with no Material Take Off) YYY is the CTR Area designation (for example: “HAA”) xxx is a sequence number (can be from 001 through 999) zz is a letter or letters describing a site support function (refer to Section 8)
Note: In older jobs, the pipe support tags were of the form PSxxxYYY. When copying or using an older pipe support index, it is not necessary to change this format. If additions are made to one of these older indexes, use the older format for consistency.
6.1.2 Second Line = Pipe Support Function. Support function is meant to be descriptive and shall not contain details. Support function shall not be used as a modifier to a standard support or other support drawing. Support Function should be (but is not restricted to) one of the following charts. Functions may be combined if necessary (for example, GUIDE/REST/LINE STOP).
| Function | Suggested Uses |
| GUIDE | Guides on vertical pipes (all around or directional). |
| REST | Horizontal pipe resting on steel without guides. |
| GUIDE/REST | Horizontal pipe resting on steel with guides (lateral guide or U-bolt). Vertical pipe with a guide and some form of line stop used together for vertical and horizontal support (see LINE STOP). |
| HOLD-DOWN | Horizontal pipe resting on steel with a specific structure for preventing lift-off of pipe (not a U-bolt). May or may not have lateral guide. |
| ANCHOR | Any support that stops the pipe at least in the North/South, East/West, and vertical directions, and also restrains the pipe from some angular or twisting deflection (for example, tight U-bolts, welded shoes, or dummy supports, and trunnions that are also rigidly fixed to structures). |
| LINE STOP | Axial stops on horizontal pipes. Trunnions, lugs, or riser clamps on vertical pipes used for weight support when no guide is used (see GUIDE/REST). |
| SPRING | Spring hangers, spring pedestals, constant effort devices. |
| HANGER | Rod hangers (not springs). |
| SUPPORT | Used to label the support component attached to a larger pipe that will support one or more smaller nearby lines. |
6.1.3 Third Line is for Shipping Support Tags – When skids are manufactured and shipped to site, they may require Shipping Supports. If Shipping Supports are designated by Air Products in the piping design, they shall be identified in the same way as a permanent support. Shipping Supports to be added by the skid fabricator shall be covered by the skid fabrication specification (by others).
6.1.4 Shipping Supports specified by Air Products shall be tagged on the isometric as: PS-YYY-xxx where YYY and xxx are the same as paragraph 6.1.1. It is recommended, but not mandatory, to use a different series of numbers, say 9xx series, to separate them from the permanent supports. The second line shall be the function, which should typically be “Anchor”. The third line shall read “Shipping Support”.
6.1.4.1 On the Pipe Support Index the TYPE shall be “Shipping,” and the comment column shall clearly state “Shipping support- to be painted yellow – to be removed at site”
6.1.4.2 If a U bolt is added to a permanent support and only the U bolt is to be removed, this must be made clear in the comments column on the pipe support index.
6.1.4.3 It is advised that the Project Manager is made aware that there are Shipping supports on the skid and that the Field Contractor installing the skid must be supplied with a copy of the Pipe Support index and Piping Isometrics so that he may identify the shipping supports to be removed without relying solely on spotting yellow-painted items on the skid. Support Modeler, PDS pipe support I-forms, and the Specialty Description Library shall be structured to produce the following Component Description in the BOM area on the piping isometric when a Pipe Support Tag is used:
| Support | Component Description |
| Welded Attachments WA-YYY-xxx | SEE WELDED ATTACHMENT SUMMARY IN THIS ISOMETRIC PACKAGE |
| Pipe Supports PS-YYY-xxx | SEE AREA PIPE SUPPORT INDEX |
| Site Supports SSWzz-YYY-xxx | SEE AREA PIPE SUPPORT INDEX |
| Rests | (No MTO; therefore, no Component Description) |
7. PIPE SUPPORT MODELING
7.1 Using Support Modeler, ALL pipe supports are modeled. This creates a very accurate model of the pipe and pipe support structures and components, and allows an accurate pipe support index to be created.
Note: The remainder of this section applies only to PDS support modeling.
7.2 Using PDS (without Support modeler), only “major” supports are modeled (see the following). The purposes of modeling supports in PDS are: For interference or clash checking during the design phase. To assist other design teams that use major pipe supports to support things such as instruments or electrical tray or conduit, and to help them to avoid clashes with pipe supports. To help the field contractor in planning field erection work from a Piping and Equipment Arrangement drawing.
7.2.1 The following supports are specifically required to be modeled: Posts resting on grade. Tee posts to grade supporting more than one pipe, regardless of pipe size. Springs hangers. Supports with knee braces and large cantilever supports.
7.2.2 “Attachments” such as U-bolts or similar items are not modeled. (See definitions of Modeling and AP‑Anchor in Section 4.)
7.2.3 Supports shall be modeled using the CAD EDEN code or other appropriate method.
7.2.3.1 The pipe support model is not intended to be an “exact” representation of the pipe support. The intent is to depict the “envelope” of space where the support exists.
7.2.4 All supports shall use the “AP-Anchor” symbol. Because of internal limitations of PDS, the AP-Anchor symbol cannot be placed with the same I-form used to model supports. Therefore, the following procedure shall be used:
7.2.4.1 Any support that is not being modeled shall use the AP-Anchor I-form when being placed and tagged in the model.
7.2.4.2 If a single tag is to be placed at a location and that support is to be modeled, a second support shall be placed at the same location using the AP-Anchor I-form. Use the icon provided for this type of support. [Alternate method: Type a double space into the tag line (line 1) and make the support “No MTO”.] This will place the AP-Anchor symbol without adding a second “tag” to the model or extracted drawings.
7.2.4.3 If there is a Welded Attachment with a Pipe Support at a single location on a pipe, at least one of the tags shall be placed with the AP-Anchor I-form. The other support may use a modeling I-form or the AP-Anchor I-form if it is not being modeled.
8. site supports and field supported lines
8.1 Site Supports are individual supports that are to be designed and fabricated by the field contractor using 4WPI-AWS002.
8.1.1 Tags for Site Supports are of the form. SSWzz-YYY-xxx
8.1.2 zz is a letter or letters designating the support function: – R = “rest” (horizontal lines) – G = “guide” (vertical lines) – GR = “guided rest” (horizontal lines) – A = “anchor” (any orientation) – FS = Field supported line (This tag is only used on the Pipe Support Index, not in the model or the piping isometric.) YYY is the CTR Area, and xxx is a sequence number as described in Section 6.
8.1.3 Site supports can be specified on any line DN80 (NPS 3) or smaller, including insulated lines, with the approval of the stress engineer or pipe supporter.
8.1.4 Site supports are summarized in the Pipe Support Index with the line number, quantity, and line size. (See Example 1 and the sample Pipe Support Index in Appendix B.)
8.2 A Field Supported line is an entire line that is to be supported by the field contractor. In this case, the isometric is annotated “FIELD SUPPORTED IN ACCORDANCE WITH 4WPI-AWS002.” No support tags are applied on these lines except where an engineered support is required at a specific location.
8.2.1 Lines DN80 (NPS 3) and smaller with the following qualifications may be Field Supported: Pipe is between the temperatures of -20° and +150°F (-29° and +65°C). Pipe is not connected to load-sensitive equipment. Pipe is not insulated. Pipe is routed within 3 ft (1000 mm) above or 18 in (450 mm) laterally from existing foundations or steelwork so that the 4WPI-AWS002 guidelines can be applied without undue design work by the field contractor.
8.2.2 Additional comments about Field Supported Lines: With approval of a Stress Analysis Engineer, supports in the vicinity of load-sensitive equipment can be specified and tagged by the designer with the balance of the line being Field Supported. An individual engineered support on an otherwise field-supported line may be tagged and designed when that particular support is needed because of its location or for other engineering reasons.
8.2.3 As an aid to cost estimating and bidding, an SSWFS tag number shall be added to the Pipe Support Index for each field supported line (type SSWFS in the pipe support number column). The line number, the estimated number of supports, and the line size shall be filled in. The support quantity estimate is the total length of the line divided by the allowable span for the line size from Table 1 in 4WPI-AWS002. (Use matching units!) (See Example 4.)
9. PIPING AND EQUIPMENT ARRANGEMENTS
9.1 On Piping Orthographic drawings and Equipment Arrangement drawings, all structural supports to grade (“dummy” posts excluded) will be annotated with the support tag number and the base plate North/East coordinates and support Top of Steel elevation.
10. isometric view drawings
10.1 One or more Isometric View drawings may be produced as necessary to depict the piping and its support system.
10.2 The only annotations required on Isometric View drawings are equipment tags, and any Pipe Support tag that could not be annotated clearly on the Orthographic drawings.
11. pipe support index
11.1 There will be one Pipe Support Index for each Area or skid assembly. The Pipe Support Index is created from a STAC template. When a new pipe support index is created in STAC, ALWAYS use the template from STAC to create it. Do not copy an index from an old job. TEMPLATE MECH 0015 This is the metric template for use in all jobs that use the “311708A World-wide Metric Standard Pipe Supports”. TEMPLATE MECH 0082 This template is set up to be used for special projects where Air Products is contractually required to use pipe supports with imperial (“English”) dimensions. Use this version of the index with the “311709A Standard Pipe Support – Imperial” pipe supports.
11.1.1 The index must be edited in STAC. Check the document out, highlight the DOCument (not the attached excel file), and select ACTION / EDIT ITEM from the STAC menu. This will allow the header information to be populated automatically. Please do not manually edit the header data (DOC number, Rev, Release Purpose, Opportunity Number, last Rev By, and Date).
11.1.2 Do not change the Print Area on the spreadsheet. The Print Area is set to print everything that is in the index. Changing the Print Area manually invites errors in the future if more supports are added beyond the manually set print area.
11.1.3 The Pipe Support Index is an A/A3 size document. Do not save the Pipe Support Index in STAC in a larger format (for example, 11×17).
11.2 All Standard, Special, Shipping, and Site pipe supports shall be listed in the Pipe Support Index. (Welded Attachment supports are not included in the Pipe Support Index. See 3PI42002.)
11.3 Each component of a pipe support shall be listed on one line of the Pipe Support index.
11.4 The Pipe Support Index includes columns for Pipe Support Number, Type, Quantity, Line Number, Standard Support Code Number, Nonstandard Support drawing number; columns to indicate Shop Pre-fabricated, Air Products Supply, and Contractor Supply; a comment column, and a miscellaneous foundation required column. (See Appendix B for an example.)
11.4.1 Type is used to categorize and group like supports when required. The following are the support types that will be used in the Index:
| Type | Used For |
| Standard | Standard Supports from the 311708A or 311709A series of drawings. |
| Special | A drawing or template that is produced by the piping or pipe support groups. |
| Structural | A drawing that is part of the Structural design package. |
| Spring | A drawing for a spring. |
| Skid | A support that will be incorporated into the skid steel structure (see Appendix A). |
| Site | Site Supports and Field Supported Lines |
| Shipping | Supports used to stabilize piping on a skid for shipment that need to be removed after piping installation, before plant start-up. |
11.4.2 The Shop Pre-fabricated, Air Products Supply, and Contractor Supply columns shall match what is on the Standard Support drawings, and do not reflect who is building the piping system (shop or field). An “X” is placed in the appropriate column on the index to specify the Supply of the support. Look at the Standard Support drawing, lower right corner, just above the drawing number for a box with a label.
| Standard Support dwg. Box label | Shop Pre-fabricated | Air Products Supply | Contractor Supply |
| no box | X | ||
| SHOP FAB | X | ||
| AP SUPPLIED | X | ||
| COMMODITIES (for Air Products internal customer stations use) |
X | ||
| COMMODITIES (when used in a project) |
X |
Special or Structural supports
| Shop Pre-fabricated | Air Products Supply | Contractor Supply | |
| Special pre-insulated supports | X | ||
| Spring Supports (when springs are to be free-issued to the contractor.) |
X | ||
| Spring Supports (when springs are to be purchased by the contractor.) |
X | ||
| Structural support assemblies | X | ||
| Simple structural members | X |
11.4.3 The Comments column shall contain a brief description of the support (see the example in Appendix B). It may also contain brief clarifying notes about the application of the support (for example, “weld to pipe rack column”). A support that requires a long explanation should be made into a special support so that a drawing can be created to facilitate installation.
11.5 The Pipe Support Index excel spreadsheet has various buttons at the top for sorting and for importing Support Modeler data. The support index must always be saved in STAC with the data sorted by “Pipe Support Tag Number” using the “Sort by PS Number” button. Doing this also sets the special formatting that makes the index more readable.
12. special pipe support drawings
12.1 All special supports shall be drawn on individual size A (ANSI) or size A4 (ISO) drawings. The Pipe Support Index will list the drawing numbers for each nonstandard support.
12.2 “Major” structural pipe support drawings drafted by the Civil/Structural design group will be done using the structural drawing procedure defined in their procedures. Each of the supports on the structural drawings will be labeled with the PS Tag Number assigned to it on the Pipe Support Index.
12.3 The Document number for Special pipe support drawings shall be the document number of the Pipe Support Index, with the Template Name or the PS Number assigned to the “Line Number” attribute in STAC. If DOC1234567890 is the document number of the Pipe Support Index: DOC1234567890 – PS-YYY-xxx (normally used for Spring Drawings, where PS-YYY-xxx is the pipe support number) or DOC1234567890 – Abbbb (used with Special Support Templates, where Abbbb is the support template name) Example:
Appendix A Alternate Methods for Specifying Pipe Supports on Skids
A1. PURPOSE
A1.1 This section/appendix defines a pipe support methodology for skids, which results in a skid design package that is intended to encourage efficient fabricator performance. The hope is that the fabricator will be able to produce a better estimate, perform to shorter schedules, and produce a better product.
A2. SCOPE
A2.1 This section/appendix applies to all Air Products-America and AP-E teams designing skidded products for yard areas.
A2.2 Generally, the methods described in Appendix A apply to relatively small skids. Highly complex equipment skids (that is, similar to cold box in complexity) should be evaluated before the start of detailed design to determine if the skid pipe support methodology defined in Appendix A should be used.
A2.3 If the methods outlined in Appendix A are not used, the “Yard” pipe support methodology defined previously in this document shall be used. See paragraph A6.
A2.4 A combination of these methods may be used at the discretion of the design team. Appendix A methods may be used on “large” structural attachment supports (see paragraph A3.3) while the Yard methodology is used on the smaller structural attachment supports.
A3. PIPE SUPPORT TAGGING IN THE PDS MODEL AND ON PIPING DRAWINGS AND ISOMETRICS FOR SKIDDED PIPING ASSEMBLIES
A3.1 On skidded piping assemblies, “Structural Attachment” type pipe supports are handled differently than they are in regular “Yard” applications.
A3.1.1 Worldwide Standard Pipe Supports and Special pipe support templates are classified as Structural Attachments (S.A.) or Piping Attachments (P.A.).
A3.2 In the context of skidded assemblies, a Piping Attachment is any support that is not welded to the structural steel framework of a skid.
A3.2.1 “Piping Attachment” Pipe Supports and Welded Attachments shall be tagged on the piping in the PDS model and itemized in the Pipe Support Index or Welded Attachment Summary as usual. The Air Products Supply or Contractor Supply columns in the Pipe Support Index are appropriately checked off.
A3.3 In the context of skidded assemblies, a Structural Attachment is any support that is welded to the structural steel framework of a skid.
A3.3.1 “Structural Attachment” Pipe Supports are tagged in the model as usual (using the same rules that apply to PS-YYY-xxx supports). How these supports are modeled and how the Pipe Support Index is filled out for these supports is different.
A3.3.2 Structural Attachment supports on skids are modeled as part of the skid structure, not as part of the piping model. (Internal procedures may vary as to the modeling and deletion of these supports for communications purposes during design.)
A3.3.3 On the Pipe Support Index, the “Type” column for Structural Attachments is “Skid.” The scope of supply columns are left blank. The words “Skid Structure” shall be typed in the Comments Column (and must be the first words in a comment if there is more to the comment).
A3.4 Major pipe support structures that cannot be represented by Standard Supports or Template drawings shall become part of the skid structure and be detailed as structure, not as a support. These supports do not get a PS number of any kind.
A4. SUPPORT TAGGING ON SKID STRUCTURAL DRAWINGS
A4.1 The orthographic drawing of the skid structure shall show the Structural Attachment pipe supports that are welded to the skid.
A4.1.1 Pipe supports that can be represented by Worldwide Standard Supports or Template drawings shall be called out on the structural drawing using the pipe support number (for example, PS-AAA-100). Pipe supports tagged this way shall be located dimensionally on the skid structure, but not detailed or annotated on the skid drawing (see Skid Modeling Section A5). Location of the support shall be by center of post, top of steel, back of angle, or other applicable dimension.
A4.1.2 Pipe support structures that cannot be represented by Worldwide Standard Supports or Template drawings shall become part of the skid structure and be detailed as structure, not as a support. These supports do not get a PS number of any kind.
A5. SKID MODELING
A5.1 The skid structure model in FrameWorks shall include the Structural Attachment pipe supports. The FrameWorks model will be referenced into the PDS model when creating Piping and Equipment Arrangement drawings and Isometric View drawings.
A5.1.1 The FrameWorks model shall include a detailed modeling of standard support and special template support structures (material and dimensional) as well as any supports incorporated into the skid structure.
A5.1.2 If required by the project, a structural steel bill of materials for the skid may be produced that specifies total quantities of steel members (not individual pieces).
A6. USING YARD PIPE SUPPORT METHODS
A6.1 The method outlined in Appendix A can become costly in the Design Phase for large or complex skids.
A6.1.1 As a guideline, if the skid has more than a dozen supports, consider the “Yard” method.
A6.1.2 If the skid structure is complex (for example, a box-like structure that encloses piping or nontraditional frames used to hold large bore pipe together while lifting a piping assembly), consider the “Yard” method.
A6.2 The “Yard” method is defined in the main body of this standard.
A6.3 The Standard Pipe Support Notes specification 4WPI-AWS001 allows for the situation when pipe supports are to be fabricated in a shop as part of a skid (for example, “field welds” become “shop welds”).
A6.4 The piping designer should specify pipe supports with the shop environment in mind.
A6.4.1 Do not use “telescoping” posts in the shop. This may apply to other field-adjustable supports as well. Use common sense so that the lowest installed cost support is used.
A6.4.2 Consider that the supports will be used as shipping supports as well as for operational support. Any structure on the skid must be able to withstand shipping loads. Unless specifically required to do so by project requirements, do not add additional pipe supports for shipping. The shop is responsible for adding sufficient temporary shipping support.
Appendix B Example 1 Multiple Pipes on a Single Support (Support Modeler requires a unique sequence number for each support)
| SSWGR-AAA-101 GUIDE/REST |
| SSWR-AAA-100 REST |
| PS-AAA-900 ANCHOR SHIPPING |
| PS-AAA-106 REST |
| PS-AAA-100 GUIDE/REST |
Appendix B (continued) Example 2 Multiple Pipes on Multiple Supports (Support Modeler requires a unique sequence number for each support)
| PS-AAA-103 GUIDE/REST |
| PS-AAA-104 GUIDE/REST |
| PS-AAA-118 GUIDE/REST |
| PS-AAA-117 GUIDE/REST |
| PS-AAA-119 GUIDE/REST |
| PS-AAA-102 GUIDE/REST |
| PS-AAA-116 GUIDE/REST |
| PS-AAA-101 GUIDE/REST |
Example 3 Supporting One Pipe from Another
| PS-AAA-105 SUPPORT |
| PS-AAA-120 GUIDE/REST |
Appendix B (continued) Example 4 Field Supported Line
For this example, using DN25 pipe, total length of the pipe run is 50 feet. Maximum span is 9′-2″ from 4WPI-AWS002, Table 1. 50/9.167=5.45 or 6 supports. This goes 1n the quantity (Qty) column of the Pipe Support Index.
Appendix C
Sample Pipe Support Index Entries for Examples in Appendix B
