Hygienic process piping · Buyer's guide
A hygienic pipe connection must match the tube bore, ferrule face, seal and clamp—not just the nominal size. Compare three actual small-bore tube entries below, then check the complete joint against its pressure and cleaning duty before ordering elbows, tees, reducers or unions.
01
These are three Alfa Laval catalogue entries, not the full dimensional tables of the standards. The listed article numbers let a buyer check the same records. Tube dimensions describe the weld end; they do not by themselves identify a compatible clamp face.
The DIN-family entry has 29 mm OD while the ISO-family entry has 25 mm OD. Their plain weld ends are not a like-for-like match. A designed transition can connect different tube families; specify its two end dimensions rather than asking for a generic DN25 elbow [1] [2].
The ISO entry has 25.0 mm OD and 22.6 mm ID; the BPE technical fields list 25.4 mm OD and 22.2 mm ID. Those different bores would need to be addressed in the joint design. Similar nominal sizes are insufficient evidence of a flush, cleanable connection [2] [3].
Article 9613407103 is titled 25.4 × 1.65 mm, but its technical fields list 1.60 mm wall and 22.20 mm ID. The table above reproduces the technical fields; CNFX cannot resolve the conflict. Obtain the current dimension drawing before accepting either wall value [3].
Article 9611819133 has an “EHEDG 0.8/0.8” description while the technical finish field states inside Ra ≤ 0.8 µm and outside ≤ 1.0 µm. The table uses that technical field and does not verify an EHEDG certification. Request the finish requirement by surface on the ordered item [1].
| Tube family / article number | Nominal size | OD / ID × wall (mm) | Finish as listed |
|---|---|---|---|
| DIN EN 10357-A (DIN 11850) · 9611819133 | DN25 | 29.00 / 26.00 × 1.50 [1] | Inside Ra ≤ 0.8 µm, outside ≤ 1.0 µm [1] |
| ISO 2037 (EN 10357-D) · 9611819010 | 25 mm | 25.00 / 22.60 × 1.20 [2] | Inside Ra ≤ 0.8 µm, weld ≤ 1.6 µm, outside ≤ 1.0 µm [2] |
| ASME BPE · 9613407103 | 1 in | 25.40 / 22.20 × 1.60 (1.000 / 0.874 × 0.063 in) [3] | SF1: inside ≤ 20 µin, outside ≤ 32 µin [3] |
02
Connection standards are as specific as tube standards. One Chinese hygienic fittings maker groups its ranges by standard [4].
Specify every end separately with a dimension drawing: a welded elbow, a clamp ferrule and a threaded union are different assemblies even when sold under the same sanitary-fittings heading.
03
Alfa Laval describes its clamp connection as these three part types. The ferrules are attached to the tube ends; the gasket sits between their sealing faces, and the clamp holds the joint together. This functional BOM applies to a detachable clamp joint, not to every welded elbow or threaded union [5].
The leaflet gives the same 1.984 in clamp-face OD for 1 in and 1½ in tube connections. A clamp that fits the face therefore does not prove that the pipe bores match. Check the tube size and gasket bore as well as the face dimension [5].
| Component | Function and material | What to specify together |
|---|---|---|
| Ferrules | Metal end pieces provide the mating sealing faces. Hygienic and UltraPure wetted-part steel grades depend on the product family [5]. | Tube OD, bore, weld wall, face diameter, seal profile and material certificate. Do not infer the grade from “stainless”. |
| Gasket | The seal between the faces. Alfa Laval lists elastomer and PTFE options by connection family; PTFE and EPDM are alternatives, not interchangeable specifications [5]. | Exact gasket model, profile, material and compatibility with process liquid and cleaning cycle. |
| Clamp | Applies the retaining force around the ferrule joint. Alfa Laval publishes distinct ratings for clamp types such as 13MHHM and A13MHP [5]. | Clamp part number, size, material, fastening method and its specified tightening condition. A ferrule steel grade does not identify the clamp grade. |
04
Alfa Laval’s leaflet lists these ratings for its own 1 in and 1½ in Tri-Clover connections. The higher rating belongs to different fastening hardware; it cannot be transferred to a similar-looking clamp from another manufacturer [5].
The same leaflet limits its listed PTFE gasket application to 200 °F because cold flow can lead to leakage. That warning concerns the gasket application; it is not a general melting point or a temperature limit for all PTFE products. Select the seal with the actual clamp, pressure and cleaning duty [5].
| Clamp type | At 20 °C | At 120 °C | Published fastening condition |
|---|---|---|---|
| 13MHHM | 34.5 bar | 20.7 bar | Wing nut: 2.8 N·m [5] |
| A13MHP | 103 bar | 82.7 bar | Bolts: 27 N·m [5] |
These manufacturer ratings derive from hydrostatic testing with standard moulded Buna-N gaskets and the specified Tri-Clover ferrules, clamps and gaskets, correctly assembled. The leaflet excludes shock pressure. Confirm the complete joint rating, gasket and temperature; the numbers are not a universal operating envelope or tightening instruction for sanitary fittings [5].
05
Finish and material are stated per standard and per surface, and in different units.
06
Define these eight specification fields for the ordered fitting and its measurement basis. A finished joint is accepted against its named parts and agreed test conditions; a catalogue-wide temperature, weight or leakage range cannot replace them.
| Field | Unit / identity | How to define it |
|---|---|---|
| Nominal diameter | DN, mm or inch | Give the tube family and actual OD/ID; the three catalogue examples above differ [1] [2] [3]. |
| Wall thickness | mm | Match the weld end and drawing; resolve the 1.65/1.60 mm BPE listing conflict before ordering [3]. |
| Operating temperature | °C plus cycle | State process and cleaning temperatures, durations and pressure. The clamp rating changes with temperature, and seal selection has its own restrictions [5]. |
| Surface roughness | Ra, µm or µin | Specify inside, outside and weld separately. Catalogue tube finish is not proof of the finish on every fitting [2] [3]. |
| Material grade | Grade designation | Name each wetted steel and seal material. 1.4307 tube and 316L tube are separate listed products [1] [3]. |
| Leakage acceptance | Agreed test and units | Define medium, pressure, temperature, duration and acceptance result in the contract. No universal mbar·L/s leak rate is established by the sources read here; this fitting has no valve seat to rate. |
| Connection type | Drawing and end standard | Identify each weld, clamp or union end. For clamps include ferrule face, seal profile and clamp part [4] [5]. |
| Weight | kg per identified part | Obtain net weight for the actual elbow, tee or assembly. A tube record or a generic 0.5–5 kg range cannot establish fitting weight. |
07
Alfa Laval’s leaflet says gasket life depends on chemical exposure, temperature and wear together. Its chemical-resistance chart is guidance for constant contact, not a validated lifetime for an alternating production/CIP/SIP cycle [5].
08
Ask for evidence per line item and heat.
09
Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Product and quantities: [elbow / tee / reducer / ferrule / union, drawing and quantity per item] Tube family and weld ends: [standard/family, OD, ID and wall for every end] Detachable ends: [face diameter, seal profile and clamp/union part number] Wetted steel: [grade]; gasket: [exact material and part]; clamp: [material and hardware] Surface finish: inside Ra [unit/value], outside [ ], weld [ ]; polishing [ ] Duty: liquid [ ], pressure [ ], temperature [ ], pressure shocks [ ] Cleaning/sterilization: chemical and concentration [ ], temperature [ ], duration/frequency [ ] Documents: dimension drawing [ ], material/heat certificates [ ], finish report [ ], joint rating [ ] Acceptance test: medium [ ], pressure/temperature [ ], duration [ ], allowable leakage/result [ ] Packing and delivery: capped ends/bags [ ], destination [ ], date [ ]
See source-checked manufacturers Send an enquiry through CNFX
8 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.
DONJOY lists clamp and threaded fittings, welded elbows/tees/reducers/ferrules, I-line and BPE ranges. Size and wall options differ by family; confirm the contracting entity.
Product scope checked 2026-10-09
The current website identifies Kaysen Steel Industry Co., Ltd. Its pipe-fittings catalogue lists 3A, DIN, ISO/IDF, BPE, SMS/DS, AS1528, BS4825 and I-line families, plus clamps and ferrules. These are supplier range labels; independent 3-A/FDA approval was not verified.
Product scope checked 2026-10-09
Its sanitary-fittings category lists welded and quick-install elbows, tees, reducers and adapter heads. The category is a product inventory, not evidence of a particular ordered finish, gasket or joint-pressure rating.
Product scope checked 2026-10-09
ONEMO’s sanitary-pipe-fittings category lists clamp and butt-weld return bends, ferrules, DIN/IDF union parts and male NPT–weld adapters. Select the end system explicitly; the catalogue mixes detachable and welded joints.
Product scope checked 2026-10-09
Its Sanitary Fittings category lists 45°/90° elbows, welded tees and Y-tees, concentric/eccentric reducers, crosses and caps. The category does not establish a pressure rating or hygienic certificate for an assembled clamp joint.
Product scope checked 2026-10-09
Its sanitary category separates clamp fittings, butt-weld/tube-OD fittings, union fittings, hangers, adapters and manifold capabilities; BPE/BioPharm is a separate category. A category listing alone does not establish the ordered tube family or finish.
Product scope checked 2026-10-09
QIIMII lists ASME BPE, DIN11864 aseptic, clamp, tube/weld, union and customized fittings as distinct ranges. Confirm the exact drawing and finish; these range names do not validate an installed sterile process.
Product scope checked 2026-10-09
The sanitary category lists single-pin clamps, ferrules, jacketed elbows, tees and crosses in named 304/316L product titles. Its similarly named 13MHHM hardware is not shown here to have Alfa Laval’s published joint ratings; obtain its own assembly data.
Product scope checked 2026-10-09
Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.
No. In one supplier's catalogue DN25 to DIN 11850 is 29 mm outside diameter, ISO 2037 25 mm is 25 mm, and ASME BPE 1 in is 25.4 mm. [1] [2] [3]
The specific ISO and BPE entries here have different outside and inside diameters. A direct unmodified end match is not established. Use matching specified ends or an engineered transition, and obtain a drawing that addresses the bore step. [2] [3]
No. The cited BPE tube entry lists SF1 with inside ≤ 20 µin and outside ≤ 32 µin. Twenty microinches equals 0.508 µm. Confirm the fitting and its weld finish separately rather than applying the tube entry to every elbow. [3]
DONJOY lists DIN 11864, DIN 11853 and ASME BPE under its aseptic range. That range description does not validate the sterility of an installed line; obtain the actual joint drawing, seal data and process-validation requirements. [4]
Sources checked 2026-10-09. Tube examples use specific Alfa Laval catalogue records. The pressure and gasket discussion uses its 13-page technical leaflet (200006866-4-EN-GB). Chinese manufacturer pages establish only their stated ranges; conflicting dimensions and unverified certification are identified separately. Sources were checked on 9 October 2026.
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