Support Skirt/Legs: Load Capacity 50-500 tons

Component Specifications

Definition

The Support Skirt/Legs are critical structural components designed to securely mount an evaporator body/vessel to its foundation while supporting the vessel's weight, operational loads, and contents. They provide mechanical stability, distribute loads evenly to prevent stress concentrations, and accommodate thermal expansion/contraction during heating/cooling cycles. These components typically consist of cylindrical skirts or multiple legs attached to the vessel shell with reinforcing plates and anchor bolt arrangements.

Working Principle

The support system transfers vertical loads (dead weight, contents) and lateral loads (wind, seismic) from the evaporator vessel to the foundation through structural members. Skirts provide continuous support around the circumference with stress distribution, while legs create discrete support points. Both designs incorporate thermal expansion joints or sliding plates to allow movement during temperature changes without causing structural damage.

Materials

Carbon steel (ASTM A36, A283 Grade C), stainless steel (304/316 for corrosive environments), low-alloy steel for high-temperature applications. Thickness typically 10-50mm depending on vessel size and load requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Height	500-3000mm
Thickness	10-50mm
Bolt Diameter	M24-M64
Load Capacity	50-500 tons
Surface Treatment	Sandblasting, primer, paint coating
Design Temperature	-40°C to 400°C
Anchor Bolt Quantity	8-24 bolts

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, ASME BPVC Section VIII, DIN 28011, EN 13445

Parent Products

This component is used in the following industrial products

Evaporator Body/Vessel

The main pressure vessel that contains the liquid to be concentrated under vacuum conditions in an evaporator system.

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Vessel/Shell

The structural housing that contains and protects the desiccant material within a desiccant bed system.

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Engineering Analysis

Risks & Mitigation

Structural failure due to corrosion
Fatigue cracking at weld joints
Foundation settlement causing misalignment
Thermal stress exceeding design limits
Improper bolt tension leading to instability

FMEA Triads

Trigger: Corrosion due to chemical exposure or moisture
Failure: Reduced structural integrity leading to collapse
Mitigation: Regular inspection, protective coatings, material selection based on environment

Trigger: Thermal cycling without proper expansion accommodation
Failure: Cracking at weld joints or base connections
Mitigation: Design with adequate expansion joints, use of sliding plates, proper clearance calculations

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±2mm for bolt hole alignment, ±3° for verticality, surface flatness within 1mm/m

Test Method

Visual inspection, ultrasonic thickness testing, magnetic particle testing for welds, load testing with strain gauges

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of Support Skirt/Legs

Manufacturer profiles associated with Support Skirt/Legs.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between support skirt and support legs for evaporators?

Support skirts are continuous cylindrical structures providing 360-degree support with better stress distribution, while legs are discrete columns offering easier access for maintenance and inspection. Skirts are preferred for tall vessels with high bending moments, while legs are common for smaller vessels.

How do support skirts accommodate thermal expansion?

Support skirts incorporate expansion joints, sliding plates, or flexible connections at the base to allow vertical and radial movement during temperature changes. This prevents thermal stress buildup that could damage the vessel or foundation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Support Skirt/Legs