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Manufacturing division · 04
Flanges
Piping Flanges
Flange solutions for pressure, connection, and project-critical piping systems
ENGIC supplies piping flanges for oil and gas, energy, process, offshore, utilities, infrastructure, water, marine, petrochemical, and industrial applications.
Our flange range supports standard piping connections as well as high-pressure, large-diameter, high-yield, sour service, low-temperature, corrosion-resistant, compact, anchor, and custom project requirements.
Products are selected according to pressure class, size, face type, material grade, dimensional standard, coating requirement, corrosion environment, inspection scope, certification requirement, and project specification.
ENGIC supports clients with flange selection, material alignment, specification review, manufacturer coordination, inspection documentation, certification control, and delivery follow-up.
Flange types may include:
- →Weld neck flanges
- →Slip-on flanges
- →Blind flanges
- →Socket weld flanges
- →Lap joint flanges
- →Threaded flanges
- →Long weld neck flanges
- →Reducing flanges
- →Expander flanges
- →Orifice flanges
- →Anchor flanges
- →Compact flanges
- →Swivel ring flanges
- →Spectacle blinds
- →Spades and spacers
- →Forged nozzles
- →Drip rings
- →Custom and special flanges
Common pressure ratings may include:
- →ASME Class 150 to Class 2500
- →PN-rated flanges including PN2.5 to PN400 where applicable
- →JIS / JPI / KS pressure ratings where applicable
- →Project-specific pressure classes where applicable
Common face types may include:
- →RF — Raised Face
- →FF — Flat Face
- →RTJ — Ring Type Joint
- →T&G — Tongue and Groove
- →M&F — Male and Female
Common material options may include:
- →Carbon steel
- →Low-temperature carbon steel
- →High-yield carbon steel
- →Stainless steel
- →Duplex stainless steel
- →Super duplex stainless steel
- →Alloy steel
- →Nickel alloys
- →Inconel
- →Incoloy
- →Monel
- →Copper nickel
- →Hastelloy
- →Titanium
- →PP, PTFE, PVC, CPVC, and UPVC where applicable
Standards and compliance may include:
- →ASME / ANSI
- →ASTM
- →API
- →AWWA
- →EN
- →DIN
- →BS
- →ISO
- →NORSOK
- →DNV
- →JIS
- →JPI
- →GOST
- →KS
- →GB
- →NACE MR0175 / ISO 15156 where applicable
- →NACE MR0103 where applicable
- →Client and project-specific standards
Sizes, ratings, standards and materials
The envelope ENGIC has supplied against:
- →Sizes 1/2 in through 72 in; larger on request; all wall thicknesses and schedules
- →Ratings Class 150 to 2500 (ASME/JPI/NORSOK), PN2.5 to PN400 (DIN/EN), 5K to 64K (JIS)
- →ASME B16.5; B16.47 Series A and B; B16.36 orifice; B16.48 spectacle and figure-8
- →BS 3293; BS/EN 1092-1; JIS B2220; JPI; AWWA C207; DIN; TAYLOR; NORSOK; API 6A and 17A
- →Sour service to NACE MR0175, NACE MR0103 and ISO 15156
- →Carbon steel: A105; A350 LF1, LF2, LF3; A694 F42 through F70; CSA Z245.12
- →Stainless: A182 F304/L/H/N through F348H, including F316Ti, F317L, F321 and F347
- →Alloy: A182 F1, F2, F11, F22, F5/F5a, F9, F91
- →Nickel alloys 600, 601, 625; Incoloy 800/800H/800HT/825; Monel 400; 90/10 and 70/30 CuNi
- →Hastelloy B-3, C-22, C-276, G-30; titanium Gr. 2, Gr. 5, Gr. 12
- →Finishes: anti-rust and oil-black paint, zinc plating, cold and hot-dip galvanising
FIG 01
Attachment types in half-section
WN
Weld neck
Tapered hub carries bending back into the pipe and the bore matches pipe ID, so there is no discontinuity at the joint. Cyclic, severe and high-pressure duty, Class 600 upward.
SO
Slip-on
Bore is larger than pipe OD; the pipe slides in and is held by a fillet weld inside and out. General service, limited to Class 600.
SW
Socket weld
Pipe lands on a machined counterbore shoulder, deliberately set back so the weld is not loaded by thermal expansion. Small bore, 4 in and under, high pressure.
LJ
Lap joint
Backing flange is loose and turns freely on a stub end, so bolt holes need no clocking and the flange never contacts the medium. Chosen where a joint is broken often.
THRD
Threaded
NPT to ASME B1.20.1, no welding at all. Low-pressure utility duty, and areas where hot work is not permitted.
BL
Blind
No bore. Closes off a line, a flanged fitting or a valve, and is the flange used to pressure-test a system before tie-in.
FIG 02
Flange facings
FF
Flat face
Full-face gasket. Classes 150 and 300, and the joint used to meet 125 lb and 250 lb cast iron without cracking it.
RF
Raised face
The default facing. 1.6 mm rise through Class 300, 6.4 mm above it; serrated concentric finish 125–250 AARH.
RTJ
Ring-type joint
Metal ring deforms into machined grooves; faces stand off. Specified from Class 600 upward. Groove side wall ≤ 1.6 µm Ra.
T&G
Tongue and groove
Gasket fully confined radially, so it cannot blow out. High-pressure and critical duty.
M&F
Male and female
Female recess retains the gasket on its outside diameter. Common on exchanger and vessel covers.
ASME B31.3 does not permit facings of different type to be bolted together. Confirming the facing on both sides of a joint is part of what Engic checks before a purchase order is released.
Related product families
01
Valves
ENGIC supplies engineered valves for isolation, control, safety, pressure, shutdown, throttling, and demanding flow applications across energy, offshore, process, utility, infrastructure, marine, and industrial projects.
02Actuators
ENGIC supplies actuator and valve automation packages for manual, on-off, modulating, fail-safe, throttling, direct gas, high-pressure, and emergency shutdown applications.
03Pipe Fittings
ENGIC supplies standard, special, forged, heavy-wall, high-yield, alloy, and custom pipe fittings for engineered piping systems across energy, offshore, utility, infrastructure, marine, and industrial projects.