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Spectacle Blind Flange Manufacturer in India | Figure-8 / Spec Blind / Spectacle Plate | ASME B16.48 | Remax Forge

Name: Spectacle Blind Flange
Brand: Remax Forge & Fittings

Spectacle Blind Flange Figure-8 Spec Blind ASME B16.48 Manufacturer Mumbai India

Key Features

One piece — solid blind disc and open ring permanently joined

Both discs are machined from a single plate and are permanently connected — they NEVER get separated. Critical safety advantage over Paddle Blinds (two separate pieces that can be mixed up or lost).

Positive isolation — zero leakage, always visible from outside

The handle always points to the active disc (BLIND or OPEN). Position is readable from outside the flange — critical for safety in confined spaces and shutdown operations.

Mandatory for maintenance isolation in hazardous service

Required by OSHA 1910.147 and Process Safety Management (PSM) regulations for positive isolation during maintenance on hazardous process lines.

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🏆ISO 9001:2015 Certified|

✅20+ Years Experience|

🌍45+ Countries Exported|

📋EN 10204 3.1 MTC Standard|

🔬In-House Testing Lab|

⚡7–21 Day Lead Time

Regulatory Requirement: Positive Isolation for Hazardous Service

Spectacle blinds are classified as positive isolation devices under OSHA 1910.147 (Control of Hazardous Energy) and are required for maintenance isolation on hazardous process lines. When ordering, specify:

1. NPS (e.g. 6")

2. Pressure Class (e.g. 300#)

3. Material (e.g. A516 Gr.70)

4. Face Type (RF / FF)

5. Service (fluid, temp, pressure)

6. Standard (ASME B16.48)

What is a Spectacle Blind Flange?

A Spectacle Blind Flange (also called Figure-8 Blind or Spec Blind) is a dual-disc safety isolation device permanently installed between two flanges. It consists of:

SOLID DISC (the "blind")

Blocks flow completely when rotated into position — provides absolute positive isolation.

OPEN RING (the "spacer")

Allows normal flow when rotated into position — ring bore matches pipe bore for unrestricted flow.

CONNECTING BAR / HANDLE

Joins both discs permanently and allows visual identification from outside — always readable at a glance.

The two discs are machined from a single plate and are permanently joined — they NEVER get separated. This is the critical safety advantage over Paddle Blinds (which use two separate pieces that can be mixed up or lost).

Industry Abbreviations & Variants

Spec Blind

Spectacle Blind

Figure-8

Figure-8 Blind

Spectacle Plate

Line Blind

Line Blind (generic)

Spade & Ring

Paddle Blind (separate pieces)

B16.48

ASME B16.48 (primary standard)

How It Works — 2 Positions:

✅ OPEN Position — Flow Allowed

Open ring sits between the two flanges. Fluid flows freely through the ring bore. Handle points to "OPEN" side.

🔒 BLIND Position — 100% Blocked

Solid blind disc rotated into position. Fluid is 100% blocked. Handle points to "BLIND" side. Positive isolation confirmed.

🛡️ SAFETY IMPORTANCE

•Position is ALWAYS VISIBLE from outside the flange — critical for safety in confined spaces and shutdown operations

•Mandatory in refineries, chemical plants, and offshore platforms for turnaround/maintenance isolation

•Provides POSITIVE ISOLATION (also called "positive blindage") — more reliable than valves (valves can leak past seats)

•OSHA, NFPA, and industry PSM (Process Safety Management) programs require positive isolation during maintenance

•Standard: ASME B16.48 (Line Blinds — the primary standard)

🔗 For frequent maintenance isolation cycling, Spectacle Blind is preferred over a standard Blind Flange. Compare our complete flange range for your project.

Standard Specifications

Complete specifications for Spectacle Blind Flanges per ASME B16.48:

Property	Detail
Product Names	Spectacle Blind, Figure-8 Blind, Spec Blind, Spectacle Plate, Spectacle Flange
Size Range	½" (15 NB) to 24" (600 NB) per ASME B16.48; larger on custom order
Pressure Classes	150#, 300#, 400#, 600#, 900#, 1500# (per ASME B16.48)
Face Types	RF (Raised Face) — most common; FF (Flat Face); RTJ NOT available for spectacle blinds
Standard	ASME B16.48 (primary); API 590; EN 1092-1 (European markets)
Thickness	Per ASME B16.48 — blind plate and ring have different thicknesses; ring is thinner
Handle	Integral handle for rotation; includes "BLIND" and "OPEN" markings on each disc per ASME B16.48
Material	Both discs and connecting bar machined from same plate — no mismatched pieces possible
MTC	EN 10204 3.1 standard; 3.2 available
Lead Time	7–21 days depending on size and material

Spectacle Blind Flange Material Grades

We forge Spectacle Blinds in all standard and exotic materials — both discs and the connecting bar machined from the same plate to ensure perfectly matched material properties:

Material Category	Grades / Specifications
Stainless Steel Spectacle Blind Flanges	ASTM/ASME A/SA182: F304, F304L, F316, F316L, F316H, F316Ti, F321, F347; Cast: CF3, CF3M, CF8, CF8M; DIN: 1.4301, 1.4306, 1.4401, 1.4404, 1.4408, 1.4409
Duplex Steel Spectacle Blind Flanges	UNS S31803/S32205 — ASTM A182 Gr F51, F52, F53, F54, F55, F57, F59, F60, F61
Super Duplex Spectacle Blind Flanges	UNS S32750/S32760 — ASTM A182 Gr F53, F55; Zeron 100
Carbon Steel Spectacle Blind Flanges	ASTM/ASME A/SA105, A105N, A216-WCB; A350 LF2 (low temp); A694 F52/F56/F60/F65/F70/F80 (high yield); DIN 1.0460, 1.0402, 1.0619
Alloy Steel Spectacle Blind Flanges	ASTM A182/ASME SA182: F5, F9, F11, F12, F22, F91 (all P-grades for high temp service)
Nickel Alloy Spectacle Blind Flanges	Inconel 600, 601, 625, 718, 690, X750 (ASTM B564/ASME SB564); Incoloy 800, 800H, 800HT, 825, 925
Hastelloy Spectacle Blind Flanges	C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X (ASTM B564)
Monel Spectacle Blind Flanges	Monel 400 (UNS N04400), Monel K500 (UNS N05500) — ASTM B564
Pure Nickel Spectacle Blind Flanges	Nickel 200, 201, 205, 205LC — ASTM B564/ASME SB564
Copper Nickel Spectacle Blind Flanges	CuNi 90/10 (C70600), CuNi 70/30 (C71500), UNS C71640 — ASTM/ASME SB 61/62/151/152
Titanium Spectacle Blind Flanges	Gr.1, Gr.2, Gr.4, Gr.5, Gr.7 — ASTM B381/ASME SB381; R50250/R50400/R50550/R50700/R52400/R53400/R56400
Aluminium Spectacle Blind Flanges	5052, 6061, 6063, 2017, 7075
Brass Spectacle Blind Flanges	3602, 2604, H59, H62
Special Alloy Spectacle Blind Flanges	Alloy 20 (ASTM B462 SB462 — Carpenter 20Cb-3); SMO 254/6Mo (UNS S31254, DIN 1.4547); Al6XN; AISI 4130; AISI 4140; Nimonic 75/80A/90; Gunmetal; Cast Iron

Spectacle Blind Flange material grades stainless duplex inconel hastelloy

Forged Raw Plate / Billets stock

Spectacle Blind Standards & Specifications

Manufactured per ASME B16.48, API 590, EN 1092-1, DIN, JIS, and BS standards for line blinds:

Standard / Spec	Scope / Application Details
🇺🇸ANSI/ASME B16.5	NPS ½" to 24" — the primary standard for most flanges
🇺🇸ASME B16.47 Series A (MSS SP-44)	NPS 26" to 60" — large diameter
🇺🇸ASME B16.47 Series B (API 605)	NPS 26" to 60" — large diameter (lighter)
🇺🇸ASME B16.36	Orifice flanges
🇺🇸ASME B16.48	Line blinds & spectacle blinds
🇪🇺DIN 2501 / EN 1092-1	European metric standard — PN ratings
🇯🇵JIS B2220	Japanese Industrial Standard
🇬🇧BS 4504 / BS 10 Table D/E/F/H	British Standard
🇺🇸MSS SP-44	Large diameter steel pipeline flanges
🇺🇸API 6A	Wellhead and Christmas tree equipment
🇺🇸API 605	Large diameter carbon steel flanges
🇺🇸AWWA C207	Water works flanges
🇷🇺GOST 12820 / 12821	Russian/CIS standard
🇦🇺AS 2129 / AS 4087 / AS/NZS 4331.1	Australian standard
🇰🇷KS B1503	Korean standard
🌐ISO 7005-1 / ISO 9624	International standard
🇺🇸SAE J518	Hydraulic flanged tube fittings
🇨🇳GB Standard	Chinese national standard

ASME B16.48 Spectacle Blind Flange Dimensions

Class 150# dimensions per ASME B16.48. Weights are approximate for Carbon Steel A516 Gr.70. Note: blind disc and ring have different thicknesses — the ring is thinner as it only provides spacing, not pressure containment.

ASME B16.48 — Class 150# Dimensions

NPS (in)	Rating	Blind OD (mm)	Ring OD (mm)	Ring Bore (mm)	Bolt Circle (mm)	No. Bolts	Blind Thk (mm)	Ring Thk (mm)	Overall Width (mm)	Wt CS (kg)
2"	150#	152	152	54	121	4	9.5	6.4	330	1.8
3"	150#	190	190	79	152	4	9.5	6.4	408	3.0
4"	150#	229	229	104	190	8	9.5	6.4	483	4.5
6"	150#	279	279	154	241	8	12.7	9.5	584	8.5
8"	150#	343	343	206	298	8	12.7	9.5	711	14.0
10"	150#	406	406	260	362	12	14.3	9.5	838	22.0
12"	150#	483	483	311	432	12	15.9	12.7	991	34.0
16"	150#	597	597	413	540	16	17.5	14.3	1219	60.0
20"	150#	699	699	514	635	20	19.1	15.9	1422	98.0
24"	150#	813	813	616	749	20	22.4	17.5	1651	148.0

Dimensions per ASME B16.48. Weights are approximate. Contact us for Class 300# tables and exact certified drawings.

📐

Blind disc and ring have DIFFERENT thicknesses — ring is thinner as it only provides spacing (not pressure containment).

📏

Overall Width = total span of the figure-8 shape. Critical dimension for space planning in congested piping areas.

⚖️

Above NPS 16", spectacle blinds become very heavy (60–150+ kg) — consider Paddle Blind (spade + spacer ring) for large bore.

📋

Class 300# requires thicker blind plates per ASME B16.48. Contact us for Class 300#, 600#, and 900# dimension tables.

📋 To Order a Spectacle Blind — Send Us These Parameters

1. NPS — Nominal Pipe Size (e.g. 6")

2. Pressure Class (e.g. 150# or 300#)

3. Material Grade (e.g. A516 Gr.70 / A182 F316L)

4. Face Type (RF — Raised Face / FF — Flat Face)

5. Service Fluid (e.g. crude oil, steam, H2S, acid)

6. Special requirements (NACE, low-temp, HIC tested)

Flange Face Types

Spectacle Blinds are available in RF (Raised Face — most common) and FF (Flat Face). RTJ is not used for spectacle blinds per ASME B16.48.

Raised Face (RF)

Most common. A raised circular ring that concentrates pressure on a smaller area to compress the gasket. Height: 1/16" for Class 150/300; 1/4" for Class 400 and above.

Flat Face (FF)

No raised portion; entire flange face is in the same plane. Used when mating against cast iron or non-metallic flanges to avoid cracking on bolt tightening.

Ring Type Joint (RTJ)

Oval or octagonal groove machined into the face; a metal ring gasket seats in the groove. Used in high-pressure, high-temperature critical service (refineries, oil fields).

Tongue & Groove (T&G)

One flange has a raised ring (tongue); the other a matching groove. Provides excellent alignment and a confined gasket. Used in pumps and valve bonnets.

Male & Female (M&F)

Similar to T&G but the female face is flat and the male face raised. Used in heat exchangers, pressure vessels, and high-integrity process joints.

Large Male & Female

Same operating principle as the standard Male & Female flange, scaled up with larger step contact surfaces for specialized heavy industrial equipment.

Advantages & Limitations — Spectacle Blind vs Other Isolation Methods

🔒

Positive Isolation — Zero Leakage

Unlike valves (which can leak past seats), a correctly installed spectacle blind provides absolute isolation — required by OSHA 1910.147 and PSM regulations.

👁️

Always Visible from Outside

The handle always points to the active disc (BLIND or OPEN). No need to open the flange — isolation status is readable at a glance from outside.

🔗

One Piece — Cannot be Lost or Mixed Up

Blind disc and open ring are permanently joined from a single plate. Unlike Paddle Blinds (two separate pieces), there is no risk of mix-up or missing components.

🔄

Fast Switching — One Rotation

Switch from flow to isolation by unbolting flanges, rotating the figure-8, and re-bolting. One operation vs removing and reinstalling two separate Paddle Blind pieces.

🏭

Mandatory for Turnarounds (TAR)

Standard safety requirement in refineries, chemical plants, and offshore platforms for unit shutdown isolation. Required by API 590, ASME B16.48, and plant safety procedures.

🛡️

Compliant with OSHA & PSM Regulations

Classified as a positive isolation device under OSHA 1910.147 (Control of Hazardous Energy). Required by process safety regulations for maintenance on hazardous lines.

vs Valves

✅Spectacle Blind provides POSITIVE isolation — zero leakage possible; valves can leak past seats

✅Spectacle Blind is visible from outside — always know current isolation status

✅No valve seat degradation — spectacle blind never wears out; valves deteriorate over time

vs Paddle Blind (Spade + Spacer Ring — two separate pieces)

✅Spectacle Blind = ONE PIECE ALWAYS — blind and ring joined; cannot be lost, mixed up, or installed wrong

✅Installation is clearer — handle points to which side is active; no confusion

✅Faster switching — one rotation vs removing and reinstalling two separate pieces

❌Spectacle Blind is heavier for large sizes (NPS 16”+) — Paddle Blind preferred for large bore

❌Spectacle Blind costs more than equivalent Paddle Blind

🛡️ Safety Compliance Requirements

→Required by OSHA 1910.147 (Lockout/Tagout — positive isolation of hazardous energy)

→Required by process safety regulations (PSM, COMAH, SEVESO) for critical isolation

→API 598, ASME B31.3 recommend spectacle blinds for maintenance isolation on hazardous service lines

Industries & Applications

✓ Primary Applications — Hazardous Service Isolation

Refinery unit isolation during scheduled maintenance "turnarounds" (TAR)

Chemical plant reactor isolation for catalyst change or inspection

Vessel isolation for inspection or repair (nitrogen purging, confined space entry)

Pipeline segment isolation for hydrostatic pressure testing

Compressor suction and discharge isolation during overhaul

Heat exchanger bundle isolation during bundle pull and inspection

Flare/relief header isolation during test or depressuring operations

Amine unit, sulfur unit, HF alkylation unit — all hazardous service isolation

Oil & Gas

Upstream extraction, midstream pipelines, downstream refineries.

Petrochemical

Chemical reactors, process lines, heat exchangers.

Power Generation

Boilers, steam turbines, nuclear plants, thermal power.

Pharmaceuticals

Hygienic piping, clean steam, pure water systems.

Food & Beverage

Sanitary flanges, sugar mills, beverage processing.

Paper & Pulp

Chemical recovery, bleaching lines.

Water Treatment

Municipal water, desalination, irrigation.

Shipbuilding

Offshore platforms, FPSOs, marine piping.

Chemical Plants

Acid service, caustic lines, solvent handling.

Construction

HVAC, fire suppression, utility headers.

Testing & Inspection

All spectacle blinds undergo dimensional inspection, face finish verification, and PMI. Optional hydrostatic pressure testing and UT are available for critical service applications.

Hydrostatic / Hydro Pressure Test

Each flange pressure tested at 1.5x working pressure per ASME code requirements.

Ultrasonic Testing (UT)

Non-destructive testing to detect internal sub-surface cracks, inclusions and forging defects.

Radiographic Testing (RT / X-Ray)

100% radiography available; mandatory for critical Class 900+ high pressure services.

Positive Material Identification (PMI)

Spectrometer validation to verify alloy chemistry precisely matches the Mill Test Certificate.

Dye Penetrant Test (DPT / LPT)

Detects micro surface cracking and porosity on critical machined seating surfaces.

Magnetic Particle Inspection (MPI)

For ferromagnetic alloys; flags surface and near-surface structural discontinuities.

Hardness Test (Brinell/Rockwell)

Verifies correct heat treatment structure and ensures mechanical properties are hit.

Direct-Reading Spectrograph

In-house lab chemical checks of billets before forging process begins.

Impact / Charpy Test

Crucial for low-temperature applications to verify ductility (e.g. A350 LF2, LTCS).

NACE Compliance Testing

Verifies sour-gas / H2S environment service capability (NACE MR0175 / MR0103).

Documents & Certificates

EN 10204 3.1 MTC standard with every shipment. Full traceability from raw plate to finished spectacle blind — chemical composition, mechanical properties, dimensional report.

Mill Test Certificate (MTC)

Provided as per EN 10204 3.1 detailing chemical & mechanical analysis.

EN 10204 3.2 Certificate

Independent third-party inspection validation (available upon request).

NACE MR0175 / MR0103 Compliance

Certified suitability for sour gas/H2S environments.

Raw Materials Certificate

Provides 100% trace origin tracking from steel billet to finished flange.

Dimensional Inspection Report

All critical tolerances checked and certified against CAD designs.

Heat Treatment Certificate

HTR and PWHT thermal chart records included where requested.

Hydrostatic Test Certificate

Pressure log documentation verifying weld integrity.

Third Party Inspection (TPI)

Bureau Veritas, SGS, Lloyds, DNV, TUV inspection options.

Packing List & Weight Certificate

Proper documentation for simple custom clearance and cargo log.

Country of Origin Certificate

Enables import tariff relief and compliance logging.

🔒 Certified Compliance Guaranteed

Spectacle Blind vs Paddle Blind vs Valve

Understanding the differences helps you select the correct isolation device for your application:

Feature	Spectacle Blind	Paddle Blind	Valve
Isolation Type	POSITIVE — zero leakage possible	Positive (two separate pieces)	Non-positive (seats can leak)
Position Visible?	✅ Yes — always externally visible	✅ Yes — tab visible	Requires indicator or tag
Pieces to Manage	1 piece — permanently joined	2 pieces (spade + ring)	1 unit — no field pieces
Standard	ASME B16.48	ASME B16.48	API 6D / API 600
Installed Permanently?	✅ Yes — stays between flanges always	Stored separately, swapped in use	Inline — always present
Large Bore (>16")	Heavy — consider Paddle Blind	Preferred for large bore	Standard for all sizes
Maintenance Isolation	✅ Best — required by OSHA 1910.147	✅ Accepted positive isolation	❌ Not considered positive isolation
Best For	Frequent cycling, NPS 2"–14"	Large bore NPS 16"+	Flow control (not isolation)

View Blind Flange → View Weld Neck Flange →

Surface Finish & Coating Options

Anti-rust Paint

Standard protection coat applied on carbon steel flanges.

Oil Black Paint

High-grade finish offering superior long-term storage corrosion block.

Yellow Transparent Lacquer

Allows technical inspectors to visually inspect metal surface during receiving.

Zinc Plated

Electro-galvanized bright zinc barrier layer for light industrial environments.

Hot Dip Galvanized (HDG)

Thick zinc alloy barrier layer for maximum outdoor marine rust protection.

Epoxy Coating

FBE or liquid epoxy coating for heavy buried pipelines and sewage lines.

Bare/Pickled & Passivated

Chemical acid cleaning to restore corrosion resistance for stainless steel.

Custom Coating

Special finishes customized exactly to customer painting specifications.

Global Export Network

AmericasUSA (Texas, Houston, Louisiana), Canada, Brazil, Colombia, Mexico

Middle EastUAE (Dubai, Abu Dhabi), Saudi Arabia, Qatar, Kuwait, Oman, Bahrain, Iraq, Iran

AfricaNigeria (Lagos, Port Harcourt), Ghana, South Africa, Egypt, Kenya, Libya

EuropeGermany, Italy, Netherlands, Norway (Stavanger), Spain, France, UK

Asia-PacificSingapore, Malaysia, Indonesia, Vietnam, Australia, South Korea, Japan

Central AsiaKazakhstan, Azerbaijan, Turkmenistan

🌍 Trusted logistics across 6 continents

Why Choose Remax Forge?

Remax Forge & Fittings stands out as a leading flange manufacturer due to our complete in-house forging, heat treatment, and precision CNC machining capabilities based in Mumbai. We provide certified compliance, factory-direct wholesale pricing, and custom forging schedules tailored to your engineering blueprints. With over 20 years of manufacturing experience, zero-defect quality management, and short lead times, we are a trusted supply partner for critical industrial piping projects.

ISO 9001:2015 Certified

Fully audited quality management workflows.

In-House Forging

Forging, heat-treat, machining in Mumbai.

Testing Laboratory

PMI, Spectro, UT, Hydro labs on-site.

Mill Certificates

EN 10204 3.1 standard; 3.2 available.

20+ Years Experience

Serving critical gas/oil clients globally.

45+ Export Countries

Proven global logistics and documentation.

Custom Forging

Special shapes, alloys and schedules.

Factory-Direct Price

Competitive pricing with no agent markup.

Technical Support

Engineers ready to assist spec selection.

Short Lead Times

Fast turnaround of custom and stock orders.

📥 Download Spectacle Blind Flange Catalogue (PDF)

Technical catalogue including Class 150# & 300# dimension tables, material grades, ASME B16.48 standards, weight charts — ready for your RFQ or technical review.

Request PDF Catalogue

Procurement Process

How to Order

Ordering high-quality forged flanges from Remax is straightforward. To ensure our engineering team provides you with a precise and competitive quote, please specify the exact flange type, nominal pipe size (NPS), pressure class rating, material grade, and facing configuration. Let us know your total quantity requirements and if you require any specialized testing or custom coatings. Contact us via email or phone for a quick, same-day response.

1Flange Type (e.g. Weld Neck, Slip On, Blind, etc.)

2Size — NPS (Nominal Pipe Size) in inches (e.g. 2", 4", 10")

3Pressure Class (e.g. 150#, 300#, 600#, 900#, 1500#, 2500#)

4Material Grade (e.g. ASTM A105, A182 F316L, A182 F51)

5Facing Type (RF / FF / RTJ / T&G / M&F)

6Quantity required

7Standard / Specification (ASME B16.5, DIN, JIS, etc.)

8Any special requirements (NACE, low-temp, PMI, 3rd party inspection, surface coating)

Direct Inquiries

info@remaxforge.com +91-97699 83108

Estimated Lead Times

Standard sizes & specs:7–14 days

Special alloys / customs:3–6 weeks

Frequently Asked Questions

Common questions about Spectacle Blind Flanges — Figure-8 vs Paddle Blind, ASME B16.48, face finish, large bore alternatives, and handle markings.

A Spectacle Blind (Figure-8) is ONE PIECE: solid blind disc and open ring joined permanently by a handle. It stays installed between flanges always. A Paddle Blind uses TWO SEPARATE pieces: a Spade (solid blind) and a Spacer Ring (open ring) that are individually stored and swapped. Spectacle Blind = safer (no mix-up), more convenient for frequent cycling. Paddle Blind = cheaper and lighter for large bore sizes (NPS 16"+).

ASME B16.48 is the primary standard for line blinds (spectacle blinds, paddle blinds, spades). ASME B16.5 covers flanges. The spectacle blind is NOT a flange itself but a line component installed BETWEEN flanges. B16.48 covers sizes, pressure classes, tolerances, materials, and markings.

The seating faces are machined to a Raised Face finish (2.5–6.3 µm Ra, known as "stock finish") matching the mating flanges. The raised face ensures the full gasket seating load is concentrated on the gasket. RTJ face is NOT used for spectacle blinds.

Above NPS 16", spectacle blinds become very heavy (60–150+ kg). At this size, Paddle Blinds (spade + spacer ring stored separately) are more common because: (1) lighter to handle, (2) can be lifted with lighter equipment, (3) significantly cheaper. The trade-off is that you must maintain both pieces carefully. Use spectacle blind for NPS 2"–14" in normal plant service; consider paddle blind above NPS 16".

Yes. All Remax Forge spectacle blinds include an integral handle with stamped or engraved "BLIND" and "OPEN" labels on the respective discs as per ASME B16.48 marking requirements. This is a code requirement — do not purchase unmarked spectacle blinds.

Yes. For steam service, ensure the material grade is rated for the service temperature. Carbon Steel A516 Gr.70 is suitable up to ~425°C. For higher temperature steam, Alloy Steel A182 F11 or F22 is used. Also ensure the gasket type is rated for steam (spiral wound or ring joint for high-pressure steam).

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