The hanger schedule is where stress analysis becomes hardware: one row per support tag, produced from the stress isometrics, listing everything needed to buy, build and install each support. Buyers inherit these tables from engineering and have to act on them — this note decodes the columns, walks one example row end to end, and flags the traps that cause wrong deliveries.
| Column | What it tells you |
|---|---|
| Support tag / mark no. | Unique ID for this support (often the stress node number) — everything is tracked against it, from data sheet to crate label |
| Line number | Which pipe the support belongs to; carries size, service and insulation info via the line list |
| Pipe size / temp | Sets clamp/shoe dimensions and material class |
| Support type | The hardware: rigid rod (R), variable spring (VS), constant support (CS), guide (G), anchor (A), shoe (SH)… legend is usually on sheet 1 |
| Hot load / operating load | The load the support carries in service — the number springs are selected around |
| Cold load / installation load | What the spring is set to before start-up; differs from hot load by rate × travel |
| Travel & direction | Vertical thermal movement cold→hot, with sign; decides variable vs constant and the spring size |
| Spring size / rate | If engineering pre-selected a spring: catalogue size and rate. If blank — supplier sizes it (that's us) |
| Arrangement | Installation geometry — the A–G convention (explained here) |
| Elevation / location | Where the support sits; with steel elevation it fixes rod length and headroom |
| Remarks | Finish, insulation shield, hydrotest stops, special attachments — read them, they change the price |
A row is only meaningful inside the document controls that apply to it. Before comparing quantities or asking a supplier to select hardware, record the schedule revision, issue purpose, effective date, unit system and legend. Then link the sheet to the current line list, stress isometric and project support standard. This prevents a technically correct reading of an obsolete or superseded schedule.
| Control | What to confirm | Why it matters |
|---|---|---|
| Revision and issue status | Revision code, issue date and whether the sheet is for inquiry, approval or construction | Separates pricing inputs from later construction data |
| Units and sign convention | Load, movement, length and temperature units; definition of positive travel | Prevents conversion and cold-load direction errors |
| Legend and type map | Project meaning of VS, CS, R, G, A, SH and arrangement letters | A code used on one project may not mean the same thing on another |
| Related documents | Line list, stress isometric, support standard and specification revisions | Provides pipe, insulation, material and interface details not repeated in each row |
| Open-item register | Every blank, conflict or assumption assigned an owner and due date | Keeps TBC fields visible instead of silently turning them into supplier assumptions |
| Tag | Line | Size | Type | Hot load | Cold load | Travel | Spring | Arr. | Remarks |
|---|---|---|---|---|---|---|---|---|---|
| H-1204 | 6"-STM-1201 | DN150, 420 °C | VS | 12.0 kN | 14.4 kN | 30 mm ↑ | 80 N/mm | B | HDG, travel stops |
Reading it: a variable spring hanger on a 6-inch steam line, carrying 12 kN in operation. The pipe rises 30 mm going hot, so the spring is set at 14.4 kN cold (12 + 80 × 30 ÷ 1000 — the math is in our selection guide). Arrangement B means it hangs from lugs directly under steel with reduced headroom. Hot-dip galvanized, shipped with travel stops fitted for hydrotest. That one row fully defines the assembly we would build and tag as H-1204.
Illustrative data only: H-1204 is a worked example created for this guide, not a customer, project or production record. Actual RFQ values must be taken from the controlled project documents.
Do not fill a missing value merely to make the spreadsheet look complete. Give each unresolved field a visible status and an evidence path. A supplier can then quote the defined scope, list exclusions and identify what must be confirmed before manufacture.
| Status | Use it when | Required next action |
|---|---|---|
| Provided | The current controlled document states the value | Record the document number and revision |
| Derived for review | A value is calculated from supplied inputs | Show the calculation or selection basis for approval |
| TBC by buyer/engineer | The project team owns the missing input | Name the owner and required response date |
| TBC by supplier | The supplier must select or propose a value | Request a marked data sheet and state the acceptance route |
| Conflict | Two controlled documents disagree | List both references; do not choose one without written disposition |
For quotation comparison, carry the same TBC register across every bidder. If one quotation includes an assumed finish, attachment or quantity while another excludes it, normalize that difference before treating the prices as comparable.
You do not need a perfect schedule to start. In order of usefulness:
Related reading: Constant support RFQ checklist · Upper-attachment RFQ checklist · Spring hanger selection guide · MSS SP-58 hanger types · Pipe support spacing table
Send it over — every tag sized, documented and priced within 24 hours on working days.