Pipe Supports & Hangers: Types, Spacing & Selection Guide

Quick Answer

Pipe supports carry the weight of piping, its contents, and insulation while controlling how the line is allowed to move. They divide into three functional families: load-bearing supports (shoes, rests, hangers, rods, clamps — carry weight), restraints (anchors, guides, line stops, struts — control or prevent movement), and variable/constant supports (spring hangers and constant-effort units — carry weight while permitting vertical thermal movement). The governing classification standard is MSS SP-58, which defines support types by number and covers materials, design, manufacture, selection, and installation. The core design principle is that hot piping must be allowed to expand while cold piping must be held stable: a rigid support on a line that grows thermally transfers enormous force into equipment nozzles, so any point that moves vertically more than about 6 mm needs a spring hanger, and where load variation must stay low (typically within 25%), a constant-effort support is used. Spacing follows the pipe's ability to span without excessive sag or stress — roughly 3 m for NPS 1, 5–6 m for NPS 3, 7 m for NPS 6, and 9 m for NPS 12 in ambient water service, reduced for hot service, insulated lines, and heavier contents, with a support always placed near concentrated loads such as valves and at changes of direction.

Piping does not stand up by itself. Every metre of pipe, every valve, every litre of contents, and every millimetre of insulation has to be carried by something — and at the same time, a line running at 300°C will try to grow several centimetres and must be allowed to do it. Pipe supports are where those two requirements meet, and getting them wrong causes failures that look like other problems: pump misalignment, cracked nozzle welds, leaking flanges, vibrating lines, and sagging that traps condensate.

The classic error is over-restraint. An engineer, reasonably enough, wants the pipe held firmly, so rigid supports go in everywhere. Then the line heats up, tries to expand, and cannot — so the expansion force redirects into whatever is weakest, usually an equipment nozzle. Pump casings crack, exchanger nozzles distort, and the plant blames the equipment. The opposite error, under-support, produces sagging lines, pooled liquid, overstressed welds, and vibration.

Good support design is therefore less about strength and more about deciding where the pipe is allowed to move, and where it must not.

For piping designers, stress engineers, construction contractors, and procurement teams — this guide covers pipe supports and hangers: the types and what each does, MSS SP-58 classification, spacing rules, thermal movement and spring selection, and the mistakes that cause field problems.

For related content, see Pipe Schedule Chart, Expansion Joints, and Plant Construction & Erection Equipment.

What Supports Have to Do

A support system must simultaneously:

1. Carry the sustained load — pipe weight + contents + insulation + valves and fittings
2. Carry occasional loads — wind, seismic, water hammer, relief reaction, snow/ice
3. Permit thermal movement where the design requires it
4. Restrain movement where the design requires it (to direct expansion into loops and away from equipment)
5. Limit sag and stress between supports
6. Protect equipment nozzles from piping loads exceeding allowable limits
7. Control vibration in pulsating or rotating-equipment-connected lines

Support Families

Load-Bearing Supports

Pipe shoes — a welded or clamped saddle that raises the pipe off a steel or concrete beam. The standard support for insulated hot lines: the shoe carries the load while the insulation passes over it undisturbed. Height matched to insulation thickness.

Rests / saddles / cradles — the pipe simply rests on structural steel, often with a wear pad to protect the pipe wall.

Clamps and clevis hangers — for suspended pipe, connecting to a rod from overhead steel.

Rod hangers — threaded rod with adjustment for level setting.

Trapeze / multi-pipe hangers — a crossbeam suspended by two rods carrying several lines together; efficient in racks and services.

Base supports — vertical support from below for risers and stanchions.

Dummy legs — a short pipe stub welded to an elbow, transferring load to structure without touching the run pipe.

Restraints

Anchor — a full fixed point. Prevents all translation and rotation. Anchors divide a line into sections and force expansion to occur between them (into loops or expansion joints). The heaviest and highest-load support type.

Guide — allows axial movement along the pipe axis but restrains lateral movement. Essential either side of expansion loops and near expansion joints to keep movement in the intended direction and prevent buckling.

Line stop / axial restraint — prevents movement in the axial direction while allowing lateral or vertical freedom. Used to direct expansion.

Sway brace / strut / snubber — resists dynamic and occasional loads (wind, seismic, water hammer) while allowing slow thermal movement. Snubbers lock under rapid movement and release under slow movement.

Roller supports — carry vertical load with low friction while allowing axial travel. Used on long hot lines.

Spring Supports (Variable and Constant)

Where a support point moves vertically as the line heats up, a rigid support will either lift off (losing support) or force the pipe down (adding stress). Springs solve this.

Variable spring hangers — a coil spring carries the load while allowing vertical movement. The load changes as the spring deflects, so load variation occurs. Industry practice generally limits acceptable variation to around 25%; beyond that, a constant support is used.

Constant effort (constant load) supports — a spring-and-lever mechanism that delivers essentially constant load throughout the travel range (typically ±6% variation). Used at critical points — near sensitive equipment nozzles, on large vertical movements, and where load variation would overstress the line.

Rule of thumb: vertical movement greater than roughly 6 mm at a support point calls for a spring hanger rather than a rigid support. Large movements and critical locations call for constant-effort supports.

MSS SP-58

MSS SP-58 — Pipe Hangers and Supports: Materials, Design, Manufacture, Selection, Application, and Installation is the governing classification standard in most international projects.

It assigns type numbers to standard support components — for example adjustable clevis hangers, pipe clamps, riser clamps, U-bolts, rollers, brackets, beam attachments, and spring units — and defines materials, load ratings, temperature limits, and finish requirements.

Practical value: specifying "MSS SP-58 Type XX" communicates a precise component without a drawing, which is why requisitions and support schedules reference these numbers directly.

Related documents include MSS SP-69 (selection and application) and MSS SP-89 (fabrication and installation practices). Piping codes — ASME B31.1 (power) and B31.3 (process) — set the stress and support requirements that the hardware must satisfy.

Support Spacing

Spacing is governed by allowable sag and allowable stress between supports. Typical maximum spans for straight runs of water-filled steel pipe at ambient temperature:

Indicative values for planning. Gas or vapour service permits longer spans (lighter contents); high temperature, insulation, thick-wall pipe, and concentrated loads all reduce them. Final spacing comes from the pipe stress analysis and the applicable code.

Additional placement rules:

• Place a support adjacent to concentrated loads — valves, strainers, in-line equipment, flanged joints
• Support near changes of direction (elbows, tees) rather than mid-span from them
• Support close to equipment connections to keep nozzle loads within allowable limits
• Avoid supports on elbows directly — use a dummy leg from the elbow instead
• Ensure a small slope for drainage where the service requires it (steam, condensate, drainable lines)

Thermal Movement and Support Design

The design sequence:

1. Calculate thermal growth — ΔL = L × α × ΔT (length × coefficient of expansion × temperature change). Carbon steel expands roughly 12 µm/m/°C; austenitic stainless roughly 17 µm/m/°C — significantly more.
2. Establish anchors — decide the fixed points that divide the line into expanding sections.
3. Provide flexibility between anchors — expansion loops, changes of direction, or expansion joints (see Expansion Joints).
4. Add guides to direct movement along the intended axis and prevent buckling, particularly either side of loops and expansion joints.
5. Determine vertical movement at each support point from the stress analysis.
6. Select support type: rigid where movement is negligible; variable spring where vertical movement exceeds about 6 mm and load variation stays within about 25%; constant effort where variation would be excessive or the location is critical.
7. Verify equipment nozzle loads against manufacturer allowables (API 610 for pumps, API 660/TEMA for exchangers, API 617 for compressors).

Hot vs cold: hot lines need freedom to grow and are designed around anchors, guides, shoes and springs. Cold and cryogenic lines need thermal insulation continuity at the support — cold shoes with insulating load-bearing inserts prevent a thermal short circuit that would cause condensation, icing, and corrosion under insulation.

Materials and Protection

• Carbon steel — standard for most supports, painted or galvanised
• Stainless steel — corrosive environments, offshore, and where contact with stainless pipe requires it
• Galvanised — outdoor and mildly corrosive service
• Isolation between dissimilar metals — a stainless or duplex pipe resting directly on carbon steel invites galvanic corrosion and iron contamination; use PTFE, elastomer, or stainless wear pads
• Wear pads — welded to the pipe under clamps and at rest points to protect the pressure boundary
• Low-friction slide plates (PTFE, graphite) — reduce friction load at sliding supports on hot lines
• Coatings — match the plant's corrosion protection specification; supports are a common corrosion-under-insulation initiation point

Common Specification Mistakes

After 15+ years supplying piping materials and supporting industrial projects:

Mistake 1: Over-Restraining a Hot Line

Rigid supports and multiple anchors on a line that expands significantly. Thermal force has nowhere to go and is transmitted into equipment nozzles, cracking welds and misaligning pumps.

Prevention: Establish deliberate anchors, provide flexibility between them, and use guides to direct movement. Verify nozzle loads against equipment allowables.

Mistake 2: Rigid Support Where Vertical Movement Occurs

Rigid hanger at a point that rises 20 mm on heat-up. The pipe lifts off the support (load redistributes to adjacent supports) or is forced down, overstressing the line.

Prevention: Use a variable spring hanger where vertical movement exceeds roughly 6 mm, and a constant-effort support where load variation would exceed about 25%.

Mistake 3: Spring Hangers Left Pinned After Commissioning

Travel stops (shipping pins) not removed after hydrotest and startup. The spring is locked rigid and does nothing.

Prevention: Include pin removal in the commissioning checklist and verify hot and cold settings against the support schedule.

Mistake 4: Missing Guides Near Expansion Loops or Joints

Expansion loop installed without guides. The pipe moves laterally instead of into the loop, or the expansion joint buckles under column instability.

Prevention: Install guides per the stress analysis and expansion joint manufacturer's requirements, usually at defined multiples of pipe diameter from the joint.

Mistake 5: Direct Contact Between Dissimilar Metals

Stainless or duplex pipe resting directly on carbon steel supports. Galvanic corrosion and iron contamination initiate pitting.

Prevention: Use stainless, PTFE, or elastomer isolation pads at every contact point with dissimilar-metal piping.

Mistake 6: Ignoring Insulation at Support Points

Shoes too short for the insulation thickness, or cold lines supported without insulating inserts. Insulation is crushed, or a thermal bridge causes icing and corrosion under insulation.

Prevention: Match shoe height to insulation thickness; specify cold shoes with load-bearing insulation for cold and cryogenic service.

Mistake 7: No Support Near Heavy In-Line Components

Long unsupported span containing a large valve. Sag and bending stress concentrate at the valve flanges, causing leaks.

Prevention: Support adjacent to all concentrated loads — valves, strainers, in-line instruments, and flanged assemblies.

Supply from Kasko Makine

Kasko Makine supplies pipe supports, hangers, and related structural components for oil & gas, petrochemical, power, water, and industrial projects:

Standard supports (MSS SP-58 types):

• Clevis hangers, adjustable band hangers, pipe clamps
• Riser clamps, U-bolts, straps
• Beam attachments, brackets, welded attachments
• Rod, turnbuckles, eye nuts, weldless eye nuts
• Roller supports and roller chairs

Engineered supports:

• Variable spring hangers and supports
• Constant effort (constant load) supports
• Hydraulic and mechanical snubbers
• Sway braces and struts
• Rigid struts

Fabricated components:

• Pipe shoes (hot and cold, insulated)
• Guides, line stops and anchors
• Dummy legs, trunnions
• Wear pads and reinforcing pads
• Slide plates with PTFE or graphite low-friction surfaces
• Trapeze and multi-pipe assemblies

Materials and finish: carbon steel (painted, galvanised, epoxy coated), stainless steel, PTFE and elastomer isolation, high-temperature and cryogenic insulation inserts

Engineering support:

• Support type selection from the line list and stress output
• Spring selection and hot/cold load setting
• Spacing and span verification
• Guide and anchor location review
• Nozzle load check against equipment allowables
• Dissimilar-metal isolation specification
• Support schedules and marked-up drawings

Certification: EN 10204 Type 3.1 material certificates, load testing for engineered supports, spring calibration certificates, coating and galvanising certificates, dimensional inspection

Logistics: Pipe supports shipped from Istanbul to projects across Africa, the Middle East, Central Asia, and beyond. Standard catalogue items 4-8 weeks; engineered springs and constant supports 10-16 weeks; fabricated shoes and specials by project schedule.

Need pipe supports and hangers? Send us your line list with sizes, operating and design temperatures, insulation thickness, calculated movements, and support locations (or your stress analysis output) to info@kaskomakine.com or WhatsApp +90 (537) 521 1399. We'll recommend support types, select and set springs, and provide a support schedule with pricing within 48 hours.

Continue Reading: Piping Guides

• Pipe Schedule Chart — Sizes and weights for load calculation
• Expansion Joints — Absorbing thermal movement
• Carbon Steel Pipe — Pipe specifications
• Pipe Flanges — Flanged joints and support proximity
• Plant Construction & Erection Equipment — Installation

Frequently Asked Questions

Q: What are the main types of pipe supports?
A: Pipe supports fall into three functional families. Load-bearing supports carry weight — pipe shoes, rests, saddles, clevis hangers, rod hangers, trapeze assemblies, base supports, and dummy legs. Restraints control movement — anchors (which prevent all movement and divide a line into expanding sections), guides (which allow axial movement but restrain lateral movement), line stops, sway braces, struts, snubbers, and roller supports. Spring supports carry weight while permitting vertical thermal movement — variable spring hangers, where load changes as the spring deflects, and constant effort supports, which deliver essentially constant load throughout their travel range. The governing classification standard is MSS SP-58, which assigns type numbers to standard components.

Q: What is MSS SP-58?
A: MSS SP-58 is the standard covering Pipe Hangers and Supports: Materials, Design, Manufacture, Selection, Application, and Installation. It assigns type numbers to standard support components — adjustable clevis hangers, pipe clamps, riser clamps, U-bolts, rollers, brackets, beam attachments, and spring units among others — and defines materials, load ratings, temperature limits, and finish requirements. Its practical value is precision in communication: specifying "MSS SP-58 Type XX" identifies an exact component without needing a drawing, which is why support schedules and requisitions reference the type numbers directly. Related documents include MSS SP-69 for selection and application and MSS SP-89 for fabrication and installation practices, while ASME B31.1 and B31.3 set the underlying code requirements.

Q: How far apart should pipe supports be spaced?
A: Spacing is limited by allowable sag and allowable stress between supports. For straight runs of water-filled steel pipe at ambient temperature, indicative maximum spans are roughly 2.1 m for NPS 1, 3.0 m for NPS 2, 4.3 m for NPS 4, 5.2 m for NPS 6, 7.0 m for NPS 12, and 9.8 m for NPS 24. Gas or vapour service permits longer spans because the contents are lighter, while high temperature, insulation, thick walls, and concentrated loads all reduce permissible spacing. Beyond span limits, supports must also be placed adjacent to concentrated loads such as valves and strainers, near changes of direction, and close to equipment connections to keep nozzle loads within allowable limits. Final spacing comes from the pipe stress analysis.

Q: When do you need a spring hanger instead of a rigid support?
A: A spring hanger is required when the support point moves vertically as the line heats up or cools down. A rigid support at such a point either loses contact as the pipe rises (transferring its load to adjacent supports) or forces the pipe down, adding stress. The common rule of thumb is that vertical movement greater than approximately 6 mm calls for a spring hanger. A variable spring hanger is acceptable where the resulting load variation stays within about 25%. Where variation would exceed that, or where the location is critical — near sensitive equipment nozzles or with large vertical travel — a constant effort support should be used instead, since it maintains essentially constant load throughout its travel range.

Q: What is the difference between an anchor and a guide?
A: An anchor is a full fixed point that prevents all translation and rotation of the pipe. Anchors divide a piping system into sections and force thermal expansion to occur between them, directing it into expansion loops or expansion joints rather than into equipment. They carry the highest loads of any support type. A guide allows axial movement along the pipe axis but restrains lateral movement. Guides keep expansion travelling in the intended direction and prevent the pipe from buckling sideways, which is why they are essential on either side of expansion loops and adjacent to expansion joints. Together, anchors and guides define the movement strategy for a hot line — anchors decide where it cannot move, guides decide which way it can.

Q: Why do stainless pipes need isolation from carbon steel supports?
A: Direct contact between stainless or duplex pipe and carbon steel supports creates two problems. First, galvanic corrosion: the dissimilar metals in the presence of moisture form a cell that accelerates attack at the contact point. Second, iron contamination: carbon steel particles embedded in the stainless surface rust and initiate pitting, breaking down the passive layer that gives stainless its corrosion resistance. Both concentrate exactly where the pipe is hardest to inspect. Prevention is straightforward — use stainless steel supports, or fit PTFE, elastomer, or stainless wear pads at every contact point. The same discipline applies during fabrication, where dedicated stainless tools and brushes prevent contamination.