Welded Puddle Pipe
A plate is welded around a steel pipe spool at the required embedment position before delivery.
Fabricated mild-steel water stops for concrete
MS Puddle Flange
An MS puddle flange uses a mild-steel plate or collar to create a water-stop projection around a pipe within concrete. Moreover, Mesta Inc. manufactures each component to the specified pipe size, steel grade, plate geometry and protection system.
What Is an MS Puddle Flange?
MS is a common commercial abbreviation for mild steel. The fabricated plate projects radially from a pipe or collar at a concrete wall, slab or tank penetration. Consequently, it lengthens the potential seepage path along the pipe surface.
The water stop forms only one part of the complete penetration system. Reliable performance also depends on the attachment detail, concrete quality, compaction, movement design and any specified joint waterproofing.
“Mild steel” does not identify one universal grade. Therefore, the purchase order should state the exact material standard and grade. If the project requires a zinc coating, buyers should use the galvanized steel puddle flange specification instead of assuming galvanizing under an MS description.
Fabrication-friendly materialMild steel supports drawing-based cutting, forming and welding under approved procedures.
Custom water-stop geometryPlate diameter, width, thickness and location follow the concrete detail.
Protection specified separatelyPaint, coating, lining or galvanizing must match the exposure and project requirements.
Exact grade requiredThe abbreviation MS alone cannot establish chemistry, mechanical properties or certification.
MS Puddle Flange Specifications
A complete specification defines the carrier pipe, plate and attachment together. Accordingly, provide these details.
| Steel grade | Governing material standard, grade, product form and required certificates. |
|---|---|
| Pipe details | Nominal size, actual OD, bore, wall thickness, material and end preparation. |
| Plate geometry | Outside diameter or width, opening, radial projection, thickness and shape. |
| Collar or sleeve | Length, bore, wall thickness, fit and plate centreline or offset. |
| Concrete interface | Wall thickness, embedment location, cover, reinforcement clearance and projections. |
| Welding | Joint configuration, continuity, process, qualification and inspection requirements. |
| Surface protection | Preparation grade, primer, coating, lining or other specified finish. |
| Quality documents | Material records, dimensions, weld reports, coating reports and release documentation. |
Standards note: list the exact material, welding, coating and inspection standards in the order. Procurement teams can consult the official ISO standards catalogue when confirming current published documents.
Mild Steel Puddle Flange Configurations
The correct arrangement depends on the pipe system and construction sequence. As a result, Mesta Inc. reviews each item from the approved drawing.
Loose Weld-On Collar
A separate ring slides over compatible steel pipe and receives a drawing-defined site or workshop weld.
Sleeve with Water Stop
A fabricated sleeve creates a reserved opening and carries an integral plate within the concrete.
Round or Square Plate
The flange profile can follow the structural detail, provided its opening, projection and clearance are defined.
Corrosion Protection for an MS Water Stop
Bare mild steel can corrode when exposed to moisture, soil, chemicals or service fluids. Therefore, the materials engineer should select the protection system for the actual environment.
Painted or Epoxy-Coated
A specified preparation and coating system can protect exposed surfaces and compatible embedded areas.
Lined Pipe Assembly
Internal lining may address the conveyed fluid, while external protection covers soil or atmospheric exposure.
Hot-Dip Galvanized
Galvanizing changes the manufacturing and inspection scope and should appear clearly in the product description.
Concrete-Embedded Surface
The coating detail must define whether the plate remains bare, coated or treated at the concrete interface.
Coating compatibility: some coatings can reduce direct bond with concrete. Follow the approved waterproofing and corrosion-protection detail rather than extending a coating automatically across every surface.
Selecting a Mild Steel Puddle Flange
Start with the penetration function and environmental exposure. Then, confirm fabrication and installation requirements.
- Verify the exact pipe OD, wall thickness and material before setting the opening.
- Choose plate projection and thickness from the approved structural or waterproofing detail.
- Coordinate the plate location with wall thickness, reinforcement and concrete cover.
- State whether the flange arrives loose or welded to a pipe spool.
- Define the steel grade and material-document requirements.
- Select the coating or lining for internal and external exposure.
- Identify pressure, thrust, settlement or movement loads that require separate engineering provisions.
MS Pipe Puddle Flange Fabrication
A controlled manufacturing sequence supports dimensional accuracy and weld quality.
Review Material and Drawing
First, verify steel grade, pipe dimensions, plate geometry, weld detail and coating scope.
Cut the Plate and Collar
Next, prepare the opening, outer profile and sleeve components within specified tolerances.
Fit the Water-Stop Plate
Then, set the plate square to the pipe at the drawing-defined centreline or offset.
Complete the Specified Weld
Use the approved procedure and maintain the required weld size, continuity and workmanship.
Prepare and Protect Surfaces
Afterwards, clean the fabrication and apply the specified coating or lining system.
Perform Final Inspection
Finally, verify dimensions, welds, coating, identification and required documentation.
Installing an MS Puddle Flange
Accurate positioning and concrete consolidation help the component perform as designed.
- Check the item mark, drawing revision, dimensions and coating condition.
- Set the plate at the specified position within the wall or slab.
- Maintain reinforcement clearance and required concrete cover.
- Support the pipe independently so it cannot shift during casting.
- Repair coating damage only by the approved procedure.
- Keep concrete-contact areas free from oil and loose contamination.
- Place and consolidate concrete around the full plate projection without leaving voids.
For a detailed pre-pour sequence and inspection checklist, see the puddle flange installation guide.
Quality Checks for Mild Steel Puddle Flanges
The inspection plan should cover material, fabrication and surface protection. In addition, the final records should match the component to its drawing revision.
Material Verification
Confirm the specified steel grade, product form, markings and certificates.
Dimensional Inspection
Measure pipe fit, plate OD or width, thickness, opening and embedment position.
Weld Examination
Review visual workmanship and complete additional NDT only when the order requires it.
Coating Inspection
Check surface preparation, coverage, thickness where specified, damage and permitted repairs.
MS Puddle Flange Applications
Mild-steel water stops can suit general industrial and water infrastructure when the grade and protection system match the exposure. For example, applications include:
- Water tanks, reservoirs and pump houses
- Valve chambers, meter pits and service ducts
- Water and wastewater treatment structures
- Foundation and basement pipe penetrations
- Industrial sumps, bunds and process pits
- Fabricated wall pipes and concrete sleeves
Application limit: mild steel without suitable protection may not suit corrosive fluids or environments. The project engineer should approve the grade and coating system.
MS Puddle Flange RFQ Checklist
For an accurate technical review and quotation, provide:
- Approved drawing, BOQ item, quantity and delivery location
- Exact steel material standard, grade and certificate requirement
- Pipe nominal size, actual OD, bore and wall thickness
- Plate outside diameter or width, thickness, opening and shape
- Collar length, bore and plate position
- Loose collar, sleeve or welded pipe-spool configuration
- Welding, NDT, coating and lining requirements
- Inspection, testing, marking, packing and documentation scope
MS Puddle Flange FAQs
What is an MS puddle flange?
It is a mild-steel plate or collar used around a pipe within a concrete penetration. Its projection helps interrupt the direct seepage path along the pipe-to-concrete interface.
Does MS identify a specific steel grade?
No. MS is a broad commercial abbreviation for mild steel. Therefore, an order should state the exact standard, grade, product form and certificate requirements.
Is an MS flange supplied bare or coated?
Either may be possible, depending on the order. Buyers should define surface preparation, primer, coating, lining, galvanizing or another finish explicitly.
Can the plate be welded directly to the pipe?
It may be welded to compatible steel pipe when the approved design and qualified procedure permit it. Pipe grade, wall thickness, weld detail and inspection must be reviewed.
What is the difference between MS and GI puddle flanges?
MS describes the mild-steel base product, while GI commonly describes zinc-coated steel. A galvanized item needs a separate coating standard and inspection scope.
Can Mesta Inc. manufacture custom dimensions?
Yes, subject to drawing and fabrication review. Provide the actual pipe OD, plate geometry, collar length, material, coating and quantity.
What information is needed for a quotation?
Send the drawing, exact steel grade, pipe and plate dimensions, configuration, coating, quantity, inspection and delivery requirements.
Request a Mild Steel Puddle Flange Quote
Send Mesta Inc. your drawing, steel grade, dimensions and protection requirements. Then, our team can review fabrication, inspection and delivery scope.