Is Class 2000 available for socket weld?

No. Class 2000 is threaded-only. Socket-weld ratings start at Class 3000 (then 6000 / 9000).

What related tools should I open next?

Use Butt-Weld Fitting Dimensions for B16.9 BW elbows, Fitting & Valve Dimensions for face-to-face, and Pipe Schedule Dimensions for matching pipe OD / wall.

Does L₂ replace make-up length on the drawing?

L₂ is B1.20.1 engagement screening. Shop make-up and sealant practice may differ — confirm with the piping class specification.

Socket Weld & Threaded Fitting Dimensions (ASME B16.11) — SW 45° Elbow NPS 2 Class 3000 (metric)

Parameter	Value
Nominal pipe size (NPS)	2"

Engineering Reference & ASME Code Basis

1. Core Formula & Variable Definitions

ASME B16.11 (Forged Fittings, Socket-Welding and Threaded) · ASME B1.20.1 (Pipe Threads, General Purpose — NPT) · ASME B31.3 (2022 Edition) · Para. 328.5.2 (socket weld gap practice) · ASME B36.10M / B36.19M (pipe OD for L₂)

L₂ = (0.80 D + 6.86) · p · ASME B1.20.1 thread engagement

g_sw = 1.5 mm (1/16 in) · ASME B31.3 Para. 328.5.2 socket gap

Envelope A/B/J/G/C from ASME B16.11 forged fitting tables (SW · threaded)

Standard ASME B16.11Thread L₂ B1.20.1SW gap 1.5 mmMax NPS 4

Primary envelope dimensions (center-to-bottom / center-to-end A, coupling length W, cap height W, band OD C, socket B/J, wall G) are taken from ASME B16.11 screening tables. NPT L₂ uses B1.20.1 with D = B36 pipe OD and p = 1/TPI. Socket-weld insertion gap g_sw = 1.5 mm per B31.3 Para. 328.5.2. Class 2000 is threaded-only; Class 9000 is high-pressure SW-only. Regular size range ends at NPS 4. Confirm OEM chart before purchase.

A (Center-to-Bottom / Center-to-End) — SW: centerline to bottom of socket. Threaded: centerline to end of fitting (mm or in).
B (Socket Diameter) — Average socket bore diameter for socket-weld fittings (mm or in).
J (Socket Depth) — Minimum socket engagement depth (mm or in).
G (Minimum Body Wall) — Minimum fitting body wall thickness per B16.11 class (mm or in).
L₂ (Thread Engagement Length) — Effective NPT thread length from ASME B1.20.1 (mm or in).
g_sw (Socket Weld Gap) — 1.5 mm (1/16 in) clearance between pipe end and socket bottom after insertion (B31.3).

2. Screening Rules & Class Scope

Default duty and out-of-scope limits for ASME B16.11 forged SW / threaded fittings.

Default dutySW 90° Elbow · NPS 1 · Class 3000

Most common forged SW elbow selection for instrument / small-bore process lines.

SW gap g_sw1.5 mm (1/16 in)

B31.3 Para. 328.5.2 practice — leave gap after pipe insertion before welding.

Class 2000Threaded only

Not applicable to socket-weld forged fittings in B16.11.

Class 9000Socket-weld only

High-pressure SW rating — not used for threaded fittings.

Out of scopeNPS > 4 · BW B16.9 · olet MSS SP-97

Larger forged specials, butt-weld fittings, and olet outlets use other calculators.

Quick Reference Lookup Table

ASME B16.11 forged fitting screening chart — engine A / G / J or L₂ (selected duties)
Conn.	Fitting	NPS	Class	Primary	G	J / L₂	Note
SW	90° Elbow	1	3000	A 28.4 mm	4.98 mm	J 12.7 mm	Default duty
THRD	Tee	2	3000	A 47.8 mm	6.05 mm	L₂ 19.3 mm	Metric pSEO
SW	Coupling	1½	6000	W 2.88 in	0.315 in	J 0.62 in	Imperial pSEO
THRD	Cap	¾	2000	W 1.44 in	0.140 in	L₂ 0.55 in	Band OD 1.46 in
SW	45° Elbow	2	3000	A 33.3 mm	6.05 mm	J 19.1 mm	45° envelope
THRD	90° Elbow	1	3000	A 1.38 in	0.196 in	L₂ 0.69 in	Imperial
SW	Tee	¾	3000	A 24.6 mm	4.27 mm	J 11.2 mm	Small bore
SW	Cap	1	3000	W 28.4 mm	4.98 mm	J 12.7 mm	SW cap
THRD	Coupling	2	3000	W 69.9 mm	6.05 mm	L₂ 19.3 mm	Full coupling
SW	90° Elbow	1½	6000	A 50.8 mm	8.00 mm	J 15.7 mm	Class 6000

Values from the FEK ASME B16.11 screening table (inch source × 25.4). Not a certified manufacturer chart — confirm OEM dimensions and class scope before purchase.

3. Material & Code Limitations

Common B16.11 forging materials and temperature / pressure class context. Confirm Table A-1 / forging allowable at metal design temperature.

Material Group	Temperature Range	Allowable Stress / Limit	Engineering Notes
ASTM A105 (CS forging)	Typically −29 to 425 °C service band (project-dependent)	Screening S ≈ 138 MPa at ambient	Default carbon-steel forged fittings. Confirm low-temp toughness and PWHT project rules.
ASTM A182 F304L / F316L (SS forging)	Cryogenic to elevated — confirm grade table	Lower S than A105 at ambient screening	Stainless forged SW/THRD fittings for corrosive / clean service. Match gasket / thread sealant chemistry.
ASTM A350 LF2 (LTCS forging)	Low-temperature carbon steel service	—	Impact-tested forging for cold service. Do not substitute A105 without project approval.
Pressure class vs pipe schedule	—	—	B16.11 class is a forging pressure rating family — it is not a pipe schedule. Match pipe wall separately via Pipe Schedule Dimensions.

Code Applicability & Safety Boundaries

Does not certify manufacturer tolerances or heat numbers.
Does not replace B31.3 branch reinforcement or olet (MSS SP-97) charts.
NPT L₂ is engagement screening — confirm sealant, taper, and makeup practice.

4. Step-by-Step Worked Example

Field VerificationShow

Worked Example — SW 90° Elbow NPS 1 Class 3000

Select a forged socket-weld 90° elbow for NPS 1 Class 3000 carbon-steel small-bore piping and read envelope dimensions for layout.

Connection:Socket weldFitting:90° ElbowNPS:1 (DN 25)Class:3000Unit system:Metric

Look up B16.11 SW Class 3000 row

NPS 1 · 90° elbow · Class 3000

Result:A = 1.12 in = 28.4 mm

Read socket geometry

Socket bore B and depth J from the same class/NPS body

Result:J = 0.50 in = 12.7 mm · B ≈ 1.33 in

Read minimum wall G

Class 3000 body wall for NPS 1

Result:G = 0.196 in = 4.98 mm

Apply SW gap on install

Formula: g_sw = 1.5 mm

Leave gap between pipe end and socket bottom before welding

Result:g_sw = 1.5 mm (1/16 in)

Conclusion: Hero center-to-bottom A = 28.4 mm with socket depth J = 12.7 mm and wall G = 4.98 mm. Use the size-scan table for adjacent NPS, and confirm the OEM chart before purchase.

5. How to look up ASME B16.11 forged fitting dimensions

1
Choose socket weld or threaded
SW uses Class 3000 / 6000 / 9000. Threaded (NPT) uses Class 2000 / 3000 / 6000.
2
Select fitting category and NPS
Elbows, tees, crosses, couplings, caps, and street elbows (threaded). Regular B16.11 sizes stop at NPS 4.
3
Pick pressure class
Match the project forged-fitting class. Class is not a pipe schedule.
4
Read A / W, G, and J or L₂
Hero shows the primary envelope. Summary chips show wall G and socket depth J or thread engagement L₂.
5
For SW, plan the 1.5 mm gap
Insert pipe, leave ~1.5 mm to the socket bottom, then weld per B31.3 practice.

6. Frequently Asked Questions & Technical References

Show

ASME B16.11 / catalog charts publish A = 1.12 in (28.4 mm) for SW 90° elbow NPS 1 Class 3000. Use the table value, not approximate handbook round-offs.