Precision Industrial Castings
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Oil & Gas
Butterfly valve body (large-bore pipeline, Class 150/300)
Cast Steel WCB; WC9; CF8M (SS); Duplex CD4MCu (sour/seawater)
API 6D / EN 593. Large bore butterfly valves (DN300+) – cast body economical vs forged. NACE MR0175 for duplex. Hard-faced or SS disc.
Oil & Gas
Booster / charge pump casing (gas compression trains, LNG)
LCC (ASTM A352 low carbon low temp CS); CF8M SS; CF3M (316L) for cryogenic LNG service
API 610. LNG service: cryogenic testing at design temperature. Charpy energy min per API 610. No PWHT exemption for LCC.
Oil & Gas
Centrifugal compressor casing (barrel type, horizontally split)
Cast Steel ASTM A216 WCB; WC6 (Cr-Mo, high pressure / temperature); LCC (cold service); CF8M (corrosive gas)
API 617 (centrifugal compressors). ASME VIII for PV components. NACE MR0175 for sour gas. ⚠ Impeller: FORGED not cast in API 617 service for rotating parts at speed.
Oil & Gas
Centrifugal process pump casing (API 610 OH2 / BB1 / BB3 types)
Cast Steel ASTM A216 WCB (standard service); A217 WC6/WC9 (high temp); CF8M / CF3M (316/316L SS) for corrosive; CD4MCu duplex (sour/chloride)
API 610 (12th ed) primary standard. BB3 for high-pressure multistage. NACE MR0175 for sour service (hardness limits: CS <22 HRC, SS <22 HRC austenitic not restricted but check). EN 10204 3.2. Impeller: SS CF8M or duplex cast + dynamically balanced.
Oil & Gas
Centrifugal pump impeller (API 610 service)
CF8M (316SS) cast; CD4MCu duplex; Super Duplex A890 Gr5A; Bronze CC333G (non-H₂S utility)
API 610. Wear ring clearances per API 610 Table C.1. PMI mandatory for all wetted parts in sour service. NACE MR0175 hardness compliance.
Oil & Gas
Choke valve body (wellhead / christmas tree utility service)
Cast Steel WCB / WC6; CA6NM (13Cr-4Ni, erosion resistant); duplex SS
API 6A (wellhead chokes). Trim: tungsten carbide or Stellite hard-facing for erosion resistance. CA6NM: quench & temper; hardness <23 HRC (NACE).
Oil & Gas
Compressor suction / discharge nozzle castings & inlet guide vane housings
Cast Steel WCB / WC6; CF8M (corrosive gas)
API 617. Nozzles: ASME B16.5 / B16.47 flanges. Guide vane position accuracy critical for aero performance.
Oil & Gas
Gate valve body & bonnet – Class 150/300 (pipeline, wellhead utility)
Carbon Steel ASTM A216 WCB (Class 150/300); LCC (low temp); WC6/WC9 (Cr-Mo, high temp); CF8M / CF3M SS (sour/corrosive); CA15 (13Cr, moderate sour)
API 600 (steel gate valves). ASME B16.34. NACE MR0175 / ISO 15156 for sour service (H₂S). Note: Class 600 and above gate valve bodies are TYPICALLY FORGED not cast – verify PO/drawing. EN 10204 3.2 MTC mandatory.
Oil & Gas
Globe valve body – Class 150/300 (control, throttling, utility)
Cast steel ASTM A216 WCB; CF8M (316 SS); WC9 (high temp service)
API 623 (cast steel globe valves). ASME B16.34. Trim: 316SS / Stellite 6 hard-facing. NACE MR0175 (sour). Note: high-pressure Class 600+ bodies typically forged.
Oil & Gas
Multistage pump stage casing / diffuser (BB3 segmental ring)
Cast Steel WCB; CF8M; WC6 (high temp service)
API 610 BB3 type. Diffuser vane geometry critical for hydraulic performance. Stack assembly – all stage casings tolerance-stacked.
Oil & Gas
Plug valve body (lubricated / non-lubricated, Class 150/300)
Cast Steel WCB; CF8M; Duplex A890 Gr4A
API 599 (cast plug valves). ASME B16.34. Sour service: NACE MR0175 hardness limits (<22 HRC for CS). Sleeved or metal-seated variants.
Oil & Gas
Pressure relief / safety valve body (PSV/PRV – process plant)
Cast Steel WCB; CF8M (316SS); CF3M (316L) for cryogenic
API 526 / ASME VIII. Trim: SS / Inconel for H₂S. Spring: Hastelloy or Elgiloy for corrosive. Note: nozzle and disc – sometimes investment cast; body often cast WCB for Class 300.
Oil & Gas
Process piping fittings – cast (tees, elbows, reducers, Class 150/300)
Cast Steel WCB; CF8M; WC6; LCC
ASME B16.9 (butt weld fittings) or B16.11 (socket weld). Note: Class 600+ butt-weld fittings often forged (ASTM A234 WPB/WP316L). Cast used for Class 150/300 and large bore.
Oil & Gas
Production manifold body / header castings (wellhead gathering)
Cast Steel WCB (sweet service); LCC (low temp); CF8M SS; WC6 (Cr-Mo elevated temp)
ASME B16.34 / API 6D. NACE MR0175 for H₂S. Flanged connections: ASME B16.5 or API 6A (wellhead). Wall thickness per ASME B31.3.
Oil & Gas
Pump bearing housing & seal gland (cast)
Cast Steel WCB; Grey Cast Iron GJL-250 (low pressure / utility)
API 610. Bearing bores: H7 tolerance. Oil seal design: API Plan 53B for toxic / sour service. Cartridge seal housing: SS 316L wetted parts.
Oil & Gas
Reciprocating compressor cylinder / crosshead guide casting
Cast Steel WCB / A27 Gr70-40; Grey Cast Iron GJL-300 (crosshead guides)
API 618 (reciprocating compressors). Cylinder bore machining: Ra <0.8µm. Liner: sometimes separate cast iron sleeve. Crosshead guide: pearlitic GCI for wear.
Oil & Gas
Reciprocating pump (plunger pump) fluid end body (HP injection)
Cast Steel A216 WCB; Duplex A890 Gr4A; Alloy Steel 4140 (some HP designs – usually forgings at very HP)
⚠ NOTE: Very high pressure fluid ends (>700 bar) are typically FORGED not cast. Cast fluid ends used for moderate pressure chemical injection / transfer. API 674 / ISO 13710. Valve and seat bores: hardened or inlay.
Oil & Gas
Subsea / topside connector hub & clamp body castings
Duplex SS A890 Gr4A; Super Duplex Gr5A; Low temp CS LCC
Subsea: DNV-ST-F101 / ASME B31.8. Super duplex mandatory for seawater-exposed. HISC (Hydrogen Induced Stress Cracking) risk management: CP shielding, stress relief.
Oil & Gas
Swing check valve body – Class 150/300
Cast Steel WCB; CF8M; WC6 (elevated temperature)
API 6D (pipeline check valves). ASME B16.34. Disc: SS 316L or hard-faced. Hinge pin: duplex SS.
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