Tesco Steel & Engineering manufactures lip type flanges — special flanges with a projecting lip on the face or bore that forms a lip-seal or lip-weld connection for non-standard, leak-tight joints. Because the lip detail is application-specific, lip type flanges are made to a standard pattern or fully to customer dimensions. Supplied in weld-neck, slip-on, and blind styles in A105, SS 304/316/321, Duplex, Monel, Inconel, and Hastelloy. Class 150 to 2500, PN1 to PN400. ISO 9001:2015 certified. Made in India.
Lip Type Flange
Lip type flanges are a special-products / custom flange line. Tesco Steel & Engineering manufactures them to drawing in the full material range alongside standard slip-on, weld-neck, and lapped-joint flanges — see the flange dimensions charts and our special products range.
| Lip Type Flange are available in the following specifications: | |
|---|---|
| Size | 1/2"NB to 56"NB |
| Class | 150#, 300#, 3000#, 6000#, 9000# |
| Sch (Schedule) | XS, XXS, STD & Schedule 20, 40, 80, 160 |
| Pressure Ratings | PN 1 - PN 400 |
| Stainless Steel Lip Type Flange | ASTM A 182 F - 304 / 304H / 304L / 316 / 316H / 316L / 316Ti, 309, 310, 317L, 321, 347, 904L |
| Duplex Steel Lip Type Flange | ASTM A 182 - F 51, F 53, F 55 |
| Alloy Steel Lip Type Flange | ASTM A 182 - F5, F9, F11, F21, F22 & F91 |
| Carbon Steel Lip Type Flange | ASTM A 105 |
| Low Temp. Carbon Steel Lip Type Flange (LTCS Lip Type Flange) | A 350 LF2 |
| Copper Nickel (Cu-Ni) Lip Type Flange | C70600, 90/10, C71500, 70/30, C71640 |
| Nickel Lip Type Flange | UNS N02200, UNS N02201 |
| Monel Lip Type Flange | UNS N04400, UNS N05500, Alloy 20 |
| Inconel Lip Type Flange | UNS N06600, UNS N06601, UNS N06625, UNS N08800, UNS N08810, UNS N08825 |
| Hastelloy Lip Type Flange | UNS N10276, UNS N06022, UNS N10665, UNS N06455 |
| Titanium Lip Type Flange | Gr. 1, Gr. 2, Gr. 3, DTH 3.7035, DTH 3.7055 |
The lip geometry is machined exactly to your sealing/welding requirement — standard pattern or fully custom.
Lip-seal and lip-weld connections for joints where a standard raised-face gasketed flange will not work.
A105, LTCS, SS 304/316/321, Duplex, Monel, Inconel, and Hastelloy for corrosive and high-temperature service.
Weld-neck, slip-on, and blind bodies machined with the lip detail required.
Suited to lined/clad pipe, thin-wall vessels, and components needing a seal-weld lip.
Manufactured with full traceability and EN 10204 3.1 material test certificates on request.
| Material | Properties | Typical Use |
|---|---|---|
| A105 Carbon Steel / A350 LF2 (LTCS) | Strong, economical; LF2 for low temp | Non-corrosive & low-temperature joints |
| SS 304 / 316 / 321 | Good corrosion resistance; 321 high-temp | Process, chemical & high-temperature service |
| Duplex 2205 / Super Duplex 2507 | High strength & chloride resistance | Seawater & offshore service |
| Monel 400 / Inconel | Excellent in HF, marine & high-temp | HF, seawater & high-temperature service |
| Hastelloy | Superior acid resistance | Aggressive chemical service |
| Industry | Typical Use | Why Lip Type Flange |
|---|---|---|
| Oil & Gas | Specialised & lined-pipe joints | Custom lip-seal / lip-weld connection |
| Chemical & Process | Lined / clad pipe & vessel joints | Alloy lip flanges; corrosion resistance |
| Power Generation | Thin-wall & high-temp connections | SS 321 / alloy lip flanges |
| Shipbuilding & Marine | Special sealing joints | Duplex / Monel corrosion resistance |
| Storage & Tanks | Thin-wall vessel connections | Seal-weld lip to thin sections |
| Pharmaceutical | Hygienic / lined connections | Clean SS 316 custom lips |
| Water & Desalination | Lined & seawater joints | Duplex / Copper-Nickel lips |
| OEM & Special Equipment | Made-to-drawing connections | Fully custom dimensions |
Q1. What is a lip type flange?
A lip type flange is a special flange with a projecting lip — a raised collar, rim, or sealing land on the face or bore — used to form a lip-seal or lip-weld connection instead of a standard flat gasketed face. The lip either confines/locates a seal or provides an edge for a seal weld. It is a made-to-order item produced to a standard pattern or fully to the customer's dimensions.
Q2. Why use a lip type flange instead of a standard flange?
Lip type flanges are used where a standard raised-face gasketed joint is unsuitable — for example on lined or clad pipe, thin-wall vessels, or specialised sealing applications — and where a located seal or a seal (lip) weld is needed. The lip provides the specific connection geometry the joint requires.
Q3. Are lip type flanges made to a standard or custom?
Both. Where a standard pattern applies the flange is made to it; otherwise it is manufactured fully to the customer's drawing and dimensions. Because the lip detail depends on the mating part and sealing method, the geometry is normally defined on a drawing before manufacture.
Q4. What flange styles and sizes are available?
Weld-neck, slip-on, and blind bodies machined with the lip detail, in Class 150 to 2500 and PN1 to PN400, sized 1/2" to 56". The style, class, and size are chosen for the service and the connection.
Q5. What materials are lip type flanges made from?
A105/LTCS, SS 304/316/321, Duplex 2205/2507, Monel, Inconel, and Hastelloy. The grade is chosen for the fluid, pressure, and temperature — with corrosion-resistant alloys common for lined-pipe and seawater connections.
Q6. What information do you need to quote a lip type flange?
A drawing or sketch of the lip geometry and the mating part, the sealing or welding method, the NPS, pressure class/PN, flange style, facing, and material. With these we can manufacture the flange to match the joint exactly.
Q7. Can lip type flanges be seal-welded to thin-wall pipe?
Yes — a common use is a seal (lip) weld of the flange lip to thin-wall pipe, tube, sheet, or a lined component, which a thick standard flange face cannot accommodate. The weld is made to a qualified procedure suited to the materials and wall thickness.
Q8. Can lip type flanges be supplied certified?
Yes. We manufacture lip type flanges to your drawing with full material traceability and EN 10204 3.1 material test certificates on request. Send your drawing and service conditions for a recommendation and quote.