Forging Supplier for Global Heat Exchanger anufacturers: TEMA and ASME VIII Applications

August 8, 2026


Heat exchangers — the thermal energy transfer equipment found in every refinery, petrochemical plant, power station, and LNG facility are among the largest consumers of forged steel components in the global industrial equipment market. Each shell-and-tube heat exchanger (the most common industrial type) contains forged channel flanges, shell nozzle forgings, tubesheet forgings, and closure head forgings in carbon steel, alloy steel, stainless steel, or nickel alloy. TEMA (Tubular Exchanger Manufacturers Association) and ASME VIII govern heat exchanger design with ASME II Part A specifying the permissible forging materials. Indian forging manufacturers supply global heat exchanger manufacturers at 20–35% cost advantage.

ComponentMaterialASME / TEMA GradeWeight Range
Channel flange (TEMA E, F, J)Carbon steel, SA-182 F316LSA-105 / SA-18250–2,000 kg
Tubesheet forgingCarbon steel, titanium, duplexSA-266 Cl.2 / SA-182 F51100–5,000 kg
Shell nozzle forgingSA-105, SA-182 F316LSA-105 / SA-18210–500 kg
Closure head / dome forgingSA-105, duplex 2205SA-266 / SA-182 F51200–3,000 kg
Floating head backing ringSA-105, SA-182 F316LSA-266 / SA-18250–500 kg

Shell-and-tube heat exchangers — the workhorse of industrial thermal management transfer heat between two fluid streams through a bundle of tubes inside a cylindrical shell. The shell-side fluid flows around the outside of the tubes; the tube-side fluid flows through the inside.
Forged components in a shell-and-tube heat exchanger include: the channel flanges (connecting the tube-side head to the shell), the shell nozzles (inlet and outlet connections), the tubesheet (the perforated plate that holds the tubes at each end one of the most geometrically complex and highest-value forged components in the heat exchanger), and the closure head or dome at each end of the channel.

TEMA (Tubular Exchanger Manufacturers Association) Class R (for severe refinery service), Class C (commercial/general purpose), and Class B (chemical service) define the design and construction standards for shell-and-tube heat exchangers. TEMA R is the most demanding specifying minimum wall thicknesses, allowable stresses, and material quality requirements that are more conservative than TEMA C or B. For forging manufacturers, TEMA R requires materials meeting ASME II Part A specifications the same SA-105, SA-182, SA-266 specifications as pressure vessels with TEMA R-specific supplementary inspection requirements for tubes and tubesheets.

The tubesheet forging is the highest-value and most technically complex heat exchanger forging. A large refinery heat exchanger tubesheet may be 2,000–3,000mm in diameter and 200–400mm thick weighing 2,000–8,000 kg in the rough-forged condition. The tubesheet is subsequently drilled with hundreds to thousands of tube holes (typically 19mm or 25mm diameter) at a precise triangular or square pitch the drilling operation removes 30–50% of the material volume. The drilling tolerance (tube hole position within ±0.5mm of theoretical centreline over a 2-metre diameter) requires the forged blank to be dimensionally stable and have consistent mechanical properties through the full thickness.

Titanium tubesheet forgings — used in seawater-cooled condensers and desalination heat exchangers where titanium’s corrosion resistance is required are a specialty category. Titanium Grade 2 (commercially pure titanium, CP Ti) tubesheets require titanium billet from qualified mills, controlled-atmosphere processing to avoid alpha case, and EB (electron beam) or plasma welding capability for any join operations. Indian forging manufacturers with titanium processing capability can supply titanium tubesheet forgings to ASME SB-381 (Titanium and Titanium Alloy Forgings).

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Vinir Engineering — Capability for this Market

  1. ASME II Part A material certification.
  2. SA-105 channel flange and shell nozzle forgings, 10–2,000 kg.
  3. SA-182 F316L and F304L stainless forgings for corrosive service.
  4. SA-266 Class 2 tubesheet rough forgings, 100–8,000 kg, open die.
  5. SA-182 F51 duplex 2205 tubesheet forgings for seawater service.
  6. SB-381 titanium Grade 2 tubesheet forgings.
  7. NACE MR0175 for sour service.
  8. 100% UT per ASME VIII Division 2 for large tubesheet forgings. PMI on all CRA components.
  9.  NABL Charpy at -46°C.
  10. TPI by Bureau Veritas, Intertek, and SGS.
  11. Lead times: SA-105 forgings 6–10 weeks; stainless 10–14 weeks; titanium 14–20 weeks.

Frequently Asked Questions

1.What is TEMA and how do TEMA classes R, C, and B affect heat exchanger forging procurement?+–
TEMA (Tubular Exchanger Manufacturers Association) publishes design standards for shell-and-tube heat exchangers. TEMA R (severe requirements) applies to petroleum and related processing applications the most stringent class, specifying minimum shell and head thicknesses, maximum allowable nozzle loadings, and mandatory inspection. TEMA C (general purpose) is less stringent. TEMA B (chemical process service) falls between R and C. For forging manufacturers, TEMA R specifications require ASME II Part A materials with certification, impact testing where specified by the design temperature, and in some cases 100% UT for tubesheet forgings. TEMA C and B allow slightly relaxed material requirements. Most refinery and LNG heat exchangers are specified as TEMA R the most demanding and highest-value market.
2.What makes a tubesheet forging more complex than a standard flange forging?+–
A tubesheet forging has the same roughly circular shape as a large flange but its post-forging processing requirements are far more demanding. After forging, the tubesheet is machined to precise thickness and diameter, then drilled with hundreds to thousands of tube holes at a precise pitch and position tolerance (±0.5mm over a 2-metre diameter is typical). The drilling operation requires the forged blank to have: consistent through-thickness properties (no hardness gradients that would cause differential drilling response), freedom from inclusions that would cause drill breakage, and dimensional stability during drilling (no distortion from residual stresses released by the drilling operation). These requirements drive tubesheet forging quality requirements significantly above simple flange forgings.
3.What is a titanium tubesheet and when is it specified for heat exchanger applications?+–
Titanium tubesheets are specified for heat exchangers where one fluid stream is seawater (or highly concentrated chloride brines) typically seawater-cooled condensers in power stations and desalination plant evaporators. Titanium Grade 2 (commercially pure) has virtually unlimited resistance to seawater corrosion it will outlast the heat exchanger shell in seawater service. Carbon and stainless steel tubesheets experience accelerated corrosion in direct seawater contact (particularly under-deposit corrosion in the tube holes). The ASME specification for titanium forgings is SB-381 (Titanium and Titanium Alloy Forgings) the titanium equivalent of SA-182 for steel. Titanium Grade 2 tubesheet forgings require controlled-atmosphere processing to prevent alpha case contamination of the tube hole surfaces.
4.What ASME documentation is required for heat exchanger tubesheet forgings under ASME VIII Division 1?+–
ASME VIII Division 1 requires the following documentation for tubesheet forgings: Material Test Report (MTR) referencing the applicable ASTM/ASME specification (SA-266 Cl.2 for carbon steel, SA-182 F316L for stainless), showing all required chemistry and mechanical properties per the specification table; heat treatment record showing the actual heat treatment cycle (for normalised or quench-and-tempered tubesheets); UT report for tubesheets above the Division 1 size threshold requiring UT; and dimensional inspection record showing the forged blank dimensions against the purchasing drawing. The heat exchanger manufacturer (vessel fabricator) assembles these documents as part of the ASME U-stamp data book the complete documentation package retained for the life of the pressure vessel.
5.How large is the global shell-and-tube heat exchanger market and what does it mean for forging demand?+–
The global shell-and-tube heat exchanger market is valued at approximately $12–15 billion annually with refinery and petrochemical applications accounting for approximately 40%, power generation 25%, and chemical processing 20%. Each shell-and-tube heat exchanger contains 3–8 major forged components (channel flanges, shell nozzles, tubesheet, closure head) at an average of 5 forgings per unit and an estimated 500,000 heat exchangers installed or replaced annually, this implies 2.5 million individual heat exchanger forging procurements per year globally. The segment is highly price-competitive cost advantage is the primary differentiator for standard carbon steel and alloy steel heat exchanger forgings, making India’s 25–35% cost advantage directly applicable to this high-volume market.