Question 1

What is a ball valve's maximum pressure rating for API 608?

Accepted Answer

API 608 specifies ball valves in Class 150, 300, and 600 ratings for sizes 1/4 inch to 24 inches. The maximum pressure rating depends on temperature: at 38°C, Class 150 is rated to 275 PSI, Class 300 to 720 PSI, and Class 600 to 1440 PSI. For higher pressures up to 5000 PSI, special severe service ball valves with reinforced seats and trunnion mounting are used. For Saudi Arabian high-pressure gas pipelines, Class 600 and Class 900 forged steel ball valves (A105, F22) are specified.

Question 2

What's the difference between floating and trunnion mounted ball valves?

Accepted Answer

In floating ball valves, the ball is not mechanically constrained and floats downstream against the seat seal when pressure is applied, relying on system pressure to maintain tightness. This design is limited to smaller sizes (up to 8 inches) and lower pressure ratings (Class 150-300). Trunnion mounted ball valves have a bearing-supported ball with fixed stem, preventing axial movement. This design handles higher pressures (Class 600 and above) and larger sizes without excessive seat wear. For UAE petrochemical and ADNOC projects, trunnion design is specified for sizes above 4 inches.

Question 3

Why use SS316L trim in sour gas (NACE) applications?

Accepted Answer

SS316L (Low Carbon 316 Stainless Steel) is specified for sour gas service per NACE MR0175/ISO 15156 because it contains minimum 2.5% molybdenum, providing excellent resistance to hydrogen sulfide stress corrosion cracking. The low carbon content (max 0.03%) prevents sensitization during welding, maintaining corrosion resistance in the heat-affected zone. For severe sour service in Saudi Arabian oil fields, 316L trim with specific hardness limits (HRC 22 max for soft parts) is mandatory. We supply NACE-compliant ball valves with material certifications for ARAMCO and SABIC projects.

Question 4

What is fire-safe ball valve design per API 607?

Accepted Answer

API 607 fire-safe testing verifies that a ball valve maintains seat sealing capability after exposure to fire. The test heats the valve to 760°C (1400°F) for 30 minutes, then cools and reapplies pressure. Fire-safe designs use graphite-based stem seals and fire-resistant seat materials (graphite or metal) that maintain integrity when standard PTFE seats would melt. After fire exposure, slight leakage may occur ( allowable up to 0.5 L/min per API 607) but the valve must still provide shut-off. All Supreme Valves fire-safe ball valves carry API 607 certification for Saudi Aramco and UAE ADNOC specifications.

Drawing Reference	SV/BLV/JACKETED/#150/1160 (dated 05-06-2026)
Title	Jacketed 3-Piece Ball Valve — Flanged End
Client	Godavari Drugs Limited, Secunderabad-03
Valve Type	3-Piece Ball Valve — Jacketed Design
Size Range	25NB / 40NB / 50NB (Jacket sizes 25×40 / 40×50 / 50×65)
Pressure Class	ANSI Class 150#
End Connection	ASME B16.5 RF Flanged
Face-to-Face	ASME B16.10
Design Standard	ASME B16.34
Testing & Inspection	API 598
Operation	Manual Hand Lever Operated
Shell Test Pressure	425 PSI (30 Kg/cm²)
Seat Test Pressure	300 PSI (22 Kg/cm²)
Air Test Pressure	7 Kg/cm²
Max. Temperature	180°C
Process Fluid	Organic Amine
Working Temperature	150°C
Compound Freezing Point	110°C
Jacket (Fabricated)	Mild Steel (M.S.), welded around valve body
Jacket Coupling	M.S. — Threaded NPT inlet/outlet
Jacket Media	Steam / Hot Water (customer to confirm)

01 — Body	SS 316 (A351 CF8M)
02 — Nut	AISI 316
03 — Ball	AISI 316
04 — Stem	AISI 316
05 — Ball Seat	PTFE
06 — Body Seal	PTFE
07 — Gland Seal	PTFE
08 — Gland Bush	AISI 316
09 — Gland Nut	SS 316
10 — Hand Lever	CS
11 — Hand Lever Nut	ASTM A194 Gr. 2H
12 — Jacket (Fabricated)	M.S.
13 — Coupling	M.S.

Parameter	Value
Size Range	1/2" to 24"
Pressure Rating	150# to 2500#

Size Range	1/2" to 48" (DN15 to DN1200)
Pressure Rating	Class 150 to 2500 (PN10 to PN420)
Body Materials	WCB, CF8M, CF3M, Duplex SS, NAB
Trim Materials	SS304, SS316, SS316L, Stellite, Inconel
End Connections	Flanged RF/FF/RTJ, Threaded, SW, BW
Standards	API 600/602/603/608/609, ASME B16.34, BS 1873
Temperature Range	-196°C to +550°C
Face to Face	ASME B16.10, EN 558, API 609

End Rf 50Nb Jacket 5065

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