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Division 01 — Oil & Gas Piping

Industrial pipe, fittings, flanges and valves — held, not ordered.

Ali Al-Nassar & Partners Company is a well-known supplier and stockist of industrial pipe, flanges, pipe fittings and valves from world-leading manufacturers. The following is the range we carry; enquire for current availability against your line list.

ISO 9001:2015 Ex-stock release

↓ Industrial pipe ↓ Fittings ↓ Flanges ↓ Valves ↓ Instrumentation ↓ Fasteners & gaskets ↓ Approvals ↓ Supply network

What we carry in depth

Industrial Pipe1/2" – 48" Fittings1/2" – 48" Flanges#150 – #2500 Valves1/2" – 24" Instrument tubes & fittings1/8" – 2" Fasteners & gaskets1/2" – 56"

Stacked carbon steel line pipe with yellow end caps in the stock yard

Category 01

Industrial Pipes

We are a premier stockist and supplier of high-performance industrial pipes, engineered to meet the rigorous demands of on-plot, off-plot, process, and structural applications. Our robust inventory encompasses seamless and welded tubulars in carbon steel, galvanized carbon steel, low-temperature carbon steel, alloy steel, and stainless steel. Every product in our supply chain is strictly maintained in accordance with global industry standards (ASTM, ASME, and API) across a comprehensive spectrum of sizes, grades, schedules, and end connections. Beyond these international baselines, we expertly navigate project-specific compliance, delivering materials fully aligned with stringent Saudi Aramco and other major end-user specifications.

Carbon steel seamless

ASTM/ASME A106, A53, A333 and A335, with API 5L PSL1/PSL2 in grades B to X70.

Carbon steel welded

ERW/HFW, LSAW and SSAW construction to ASTM A53 and API 5L PSL1/PSL2.

Galvanized

Seamless and welded, galvanised to ASTM/ASME A/SA 53 and API 5L.

Stainless steel

Seamless and welded to A312, A358, A269 and A688 in 304/304L and 316/316L.

Project Specific Standards and Specifications 01-SAMSS-035, 01-SAMSS-043, 01-SAMSS-046, 01-SAMSS-047, 12-SAMSS-018 etc.

Carbon Steel Seamless Pipes

Specifications	ASTM/ASME A/SA 53	ASTM/ASME A/SA 106	ASTM/ASME A/SA 333	ASTM/ASME A/SA 335	API 5L PSL1 API 5L PSL2
Grade	A/B	A/B	6	P11/P22	B · X42 · X46 · X52 · X56 · X60 · X65 · X70

Size	1/2″ up to 24″
Schedule	SCH20 · SCH30 · SCH40 · STD · SCH60 · SCH80 · XS · SCH120 · SCH140 · SCH160 · XXS
Dimension	ASME B36.10 · API 5L · ASME B16.25
Length	6 MTR · SRL · DRL
End	Plain Ends · Beveled Ends · Threaded

Carbon Steel Welded Pipes

Specifications	ASTM/ASME A/SA 53	ASTM/ASME API 5L PSL1/PSL2
Grade	A/B	B · X42 · X46 · X52 · X56 · X60 · X65 · X70

Weld Type	ERW/HFW · LSAW & SSAW
Size	1/2″ up to 48″
Schedule	SCH20 · SCH30 · SCH40 · STD · SCH60 · SCH80 · XS · SCH120 · SCH140 · SCH160 · XXS
Dimension	ASME B36.10 · API 5L · ASME B16.25
Length	6 MTR · SRL · DRL
End	Plain Ends · Beveled Ends · Threaded

Galvanized Seamless and Welded Pipes

Specifications	ASTM/ASME A/SA 53	ASTM/ASME API 5L PSL1/PSL2
Grade	A/B	B · X42 · X46 · X52 · X56 · X60 · X65 · X70

Size	GP: 1/2" to 16" · GT/GC: 1/2" to 6"
Schedule	SCH40 · STD · SCH60 · SCH80 · XS · SCH160 · XXS
Dimension	ASME B36.10 · API 5L · ASME B1.20.1
Length	6 MTR · SRL · DRL
End	GP · GT · GC
Galvanization:	ASTM A123. A53

Stainless Steel Seamless Pipes

Specifications	ASTM/ASME A/SA 312	ASTM A269 / ASTM A688
Grade	TP 304/304L · TP 316/316L · TP 321 · Duplex · Super Duplex and Monel.

Size	1/2″ up to 30″
Schedule	SCH10S · SCH40S · SCH80S · SCH160S
Dimension	ASME B36.19 · ASME B16.25
Length	6 MTR · SRL
End	Plain Ends · Beveled Ends

Stainless Steel Welded Pipes

Specifications	ASTM/ASME A/SA 312	ASTM/ASME A/SA 358
Grade	TP 304/304L	TP 316/316L

Size	1/2″ up to 24″
Schedule	SCH10S · SCH40S · SCH80S · SCH160S
Dimension	ASME B36.19 · ASME B16.25
Length	6 MTR · SRL
End	Plain Ends · Beveled Ends

Carbon steel seamless

1/2″ – 24″

Carbon steel welded

1/2″ – 48″

Stainless seamless

1/2″ – 30″

Stainless welded

1/2″ – 24″

Category 02

Fittings

Our comprehensive portfolio of industrial fittings is engineered to support critical piping, process, and utility applications. We supply a diverse range of materials, including carbon steel, galvanized carbon steel, low-temperature carbon steel, alloy steel, stainless steel, and malleable iron. Our inventory features premium butt-welded, forged steel, and malleable iron fittings, available across a wide spectrum of sizes, pressure classes, and end connections. Ensuring absolute reliability, all fittings strictly conform to international ASTM, ASME, and MSS dimensional standards. Furthermore, we possess the technical capability to fulfill specialized Saudi Aramco project requirements, including strict adherence to specifications such as 02-SAMSS-013 and 02-SAMSS-005.

Butt-weld fittings

Elbows, tees, reducers, end caps and stub ends from 1/2″ to 48″.

Forged steel fittings

Socket-weld and threaded elbows, tees, couplings, unions and nipples to 6″.

O-let fittings

Weldolet, threadolet and sockolet branch outlets, class 3000 to 9000.

Malleable iron fittings

Elbows, tees, couplings, unions and bushings in galvanised and black to 6″.

Butt Welded Fittings

Type	Elbows 90° & 45° (LR & SR) Tees (Straight/Reducing) Reducers (Concentric/Eccentric)	End Caps STUB Ends

Specifications	ASTM A234	ASTM/ASME A/SA 420	ASTM/ASME A/SA 403	ASTM A860
Grade	WPB · WPC · WP11/WP12 CL1/CL2	WPL6 · WPL3	WP304/304L · WP316/316L	WPHY60 · WPHY65 · WPHY70
Type	Seamless and Welded
Size	1/2″ up to 48″
Schedule	CS: SCH20, SCH30, SCH40, STD, SCH60, SCH80, XS, SCH120, SCH140, SCH160, XXS.. SS: SCH5S, SCH10S, SCH40S, SCH80S, S160S
Dimension	ASME B16.9 · B16.25 · MSS-SP43 · MSS-SP75
End	Beveled End

Forged Steel Fittings

Type	Elbows (90°, 45°, Street) Tees (Straight/Reducing/Cross) Couplings (Full/Half/Reducing) Plugs (Round/Square/Hex Head/Bull) Unions	Welding Boss Bushings Hex Nipples Pipe Nipples Swage Nipples

Specifications	ASME/ASTM A/SA 105N	ASME/ASTM A/SA 350	ASME/ASTM A/SA 333	API 5L A/SA 106/A/SA 53	ASME/ASTM A/SA 234
Grade		LF2	Gr.6	Gr. B	WPB

Specifications	ASTM/ASME A/SA 182	ASTM/ASME A/SA 312	ASTM/ASME A/SA 403	ASTM/ASME A/SA 420
Grade	F304/304L · F316/316L	TP304/304L · TP316/316L	WP304/304L · WP316/316L	WPL6

Size	1/8" to 6"
Class	CL 3000 · 6000 · 9000
Schedule	SCH-10 to SCH-XXS
Dimension	ASME B16.11 · ASME B1.20.1 · ASME B16.25 · MSS SP-95
End	Threaded · Socket Weld · Plain

O-lets Fittings

Type	Weldolet · Threadolet · Sockolet

Specifications	ASME/ASTM A/SA 105	ASME/ASTM A/SA 350	ASTM/ASME A/SA 182
Grade		LF2	F304/304L · F316/316L

Schedule/Class	Weldolet	Threadolet	Sockolet
	SCH-10 up to SCH-XXS	CL 3000 · 6000	CL 3000 · 6000 · 9000
Size	Branch: 1/4" – 12" · Run: 1/2" – 80"
Dimension	ASME B16.9 · ASME B16.11 · ASME B16.25 · MSS SP-97 · ASME B1.20.1
End	Beveled End · Threaded · Socket weld

Malleable Iron Fittings

Type	Elbows (90°, 45°, Street) Tees (Straight/Reducing/Cross) Couplings (Full, Half/Reducing) Plugs (Round Head, Square Head)	Unions Bushings Hex Nipples

Specifications	ASTM A197/A47 · ASTM A153
Size	1/8" to 6"
Class	CL 150 · 300
Dimension	ASME B16.3 · ASME B1.20.1 · BS EN 10242
End	Threaded (NPT/BSPT)

Category 03

Flanges

We supply a comprehensive range of high-performance flanges engineered for demanding piping, process, and industrial applications. Our inventory encompasses carbon steel, galvanized carbon steel, low-temperature carbon steel, alloy steel, and stainless steel. Available configurations include Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, and Orifice Flanges, complemented by Spectacle Plates, and Spacers. To accommodate diverse project requirements, our products are offered across a broad spectrum of material specifications, grades, schedules, facing types, and end connections. All flanges strictly adhere to applicable ASME, ASTM, and MSS standards — including Saudi Aramco materials specification 02-SAMSS-011 — with carbon steel sizes ranging from ½" to 48", stainless steel sizes from ½" to 24", and pressure ratings up to Class 2500.

Weld neck

Raised-face weld-neck flanges in carbon and stainless, to Class 2500.

Slip-on & socket weld

Slip-on, socket-weld, threaded and lap-joint patterns across the range.

Blind

Blind flanges for line terminations and pressure testing.

Orifice & spectacle

Orifice flanges, spectacle plates, spacers and line blinds.

Type	Weld Neck Slip-On Blind Socket Weld Threaded	Lap Joint Orifice Flanges Spectacle Plates Blinds Spacers

Specifications	ASTM/ASME A/SA 105N	ASTM/ASME A/SA 350	ASTM/ASME A/SA 516	ASTM/ASME A/SA 240	ASTM/ASME A/SA 182
Grade	B	LF2 CL1 · CL2	GR. 60/70	304/304L · 316/316L	F304/304L · F316/316L

	Carbon Steel	Stainless Steel
Size	1/2" to 48"	1/2" to 24″
Schedule	SCH20 · SCH30 · SCH40 · STD · SCH60 · SCH80 · XS · SCH120 · SCH140 · SCH160 · XXS	SCH10S · SCH40S · SCH80S · S160S
Class	#150 up to #2500
Dimension	ASME B16.5 · ASME B16.25 · ASME B16.47 Series A and Series B · ASME B16.48 · MSS SP-44 · ASME B1.20.1
Face	Raised Face · Flat Face · Ring Joint.

Category 04

Valves

Our extensive valve portfolio features forged and cast carbon steel, stainless steel, and bronze valves engineered for critical piping, process, utility, and industrial applications. The comprehensive range encompasses gate, globe, check, ball, butterfly, and control valves, available in both OS&Y rising stem and non-rising stem (NRS) designs. We supply forged valves from ½" to 2", cast valves from 2" to 24", and bronze valves from ½" to 3". To meet diverse operational demands, our valves are offered in a variety of material grades, trims, pressure classes, and end connections — including NPT, socket weld, NPT-socket weld combinations, and raised face configurations. All products are strictly manufactured to comply with applicable API, ASME, ASTM, ANSI, and MSS standards, while seamlessly fulfilling relevant Saudi Aramco project specifications and NACE MR0175 requirements.

Forged steel valves

Gate, globe, check and ball valves in A105N, LF2 and F316/316L, 1/2″ to 2″.

Cast steel valves

Gate, globe, check, ball, butterfly and control valves in WCB/WCC, LCB/LCC and CF8M/CF3M, 2″ to 24″.

Bronze valves (OS&Y)

Gate, globe, check and ball valves in C92200 and C83600 bronze, 1/2″ to 3″.

All valve types

Gate, globe, check, ball, butterfly and control, in OS&Y rising-stem and NRS designs.

Forged Steel Valves

Type	Gate Gate Extended body Globe	Check Ball

Specifications	ASME/ASTM A/SA 105	ASTM/ASME A/SA350	ASTM/ASME A/SA 182
Grade	A105N	LF2	F 316/316L
Size	1/2″ to 2″
Trim	5 · 8 · 12 · 16
Schedule/ Class	Class: 150 · 300 · 800 · 1500 · 2500
Dimension	ASME B16.34 · B16.11 · ASME B1.20.1 · ASME B16.10
Standards & Specifications	API 602 · API 598 · 04-SAMSS-035 · 04-SAMSS-048 · NACE MR0175
End	NPT · SW · NPT X SW · RF · MNPT · FNPT · MSW

Cast Steel Valves

Type	Gate Globe Check	Ball Butterfly Control

Specifications	ASME/ASTM A/SA 216	ASTM/ASME A/SA350	ASTM/ASME A/SA 351
Grade	WCB · WCC	LCB · LCC	CF8M · CF3M
Size	2″ to 24″
Trim	5 · 8 · 12 & 16
Schedule/ Class	Class: 150 · 300 · 600 · 900
Dimension	ASME B16.10 · ASME B16.5
Standards & Specifications	API 600 · API A609 · ANSI B16.10 · API 598 · 04-SAMSS-035 · 04-SAMSS-048 · NACE MR0175
End	Flanged ends · Buttwelded ends.

Bronze Valves (OS & Y)

Type	Gate Globe	Check Ball

Specifications	ASTM B61/B2
Grade	C92200 · C83600
Size	1/2″ to 3″
Trim	Bronze
Schedule/ Class	Class: 150 · 200 · 300
Dimension	ASME B1.20.1
Standards & Specifications	BS 5154 · API 598 · MSS-SP-80 · 04-SAMSS-035 · 04-SAMSS-048 · NACE MR0175
End	NPT

Stainless steel compression tube fittings — unions, tees, elbows and male connectors

Category 05

Instrumentation Tubes & Fittings

Our instrumentation tubes and compression fittings provide secure, mechanical connections for joining tubing to critical instruments and valves without the need for welding, soldering, or adhesives. Engineered for high-pressure and high-vibration environments, these fittings guarantee a leak-tight seal while allowing for easy, cold-work assembly and disassembly. Available in premium materials such as SS 316 — with exotic alloys available upon request — and spanning sizes from 1/8″ to 2″, our highly reusable compression fittings deliver uncompromising safety, zero leakage, and long-term reliability for complex industrial fluid systems.

Instrument tubing

Seamless small-bore tubing to ASTM A179 and stainless grades.

Compression fittings

Elbows, tees, crosses and straights for instrument lines.

Adapters

Tube adapters and connectors between tube ends and pipe threads.

Caps & plugs

End caps, plugs and replacement ferrules and nuts.

Type	Elbows Straight Cross Tees	Tube Adopters Caps & Plugs Replacement Parts

Specifications	ASTM A179 · ASTM A479 · ASME B31.1 · ASME B31.3 · ASTM A269
Grade	SS316
Size	1/8" to 2"
Dimension	Catalog
Standards & Specifications	NACE MR0175 / ISO15156
End	NPT / Plain / Sealing Ends

Machine bolts and heavy hex nuts arranged around a rubber flange gasket

Category 06

Fasteners & Gaskets

We stock and supply a comprehensive, high-quality range of gaskets and fastening products designed to ensure absolute joint integrity across diverse piping and flange applications. Our fastening inventory includes machine bolts (ASTM A307), U-bolts ranging from ½" to 10", and stud bolts (ASTM A193 B7, B16, B8, B8M) paired with compatible high-grade nuts. Complementing these are our advanced sealing solutions, which feature rubber, spiral wound, non-asbestos, elastomeric, and Teflon gaskets available in sizes from ½" to 56". Engineered to withstand varying pressure classes and extreme industrial service conditions, our products are supplied in strict accordance with recognized industry standards — including ASTM, ASME, API, ANSI, and MSS SP — to fulfill both general industrial needs and rigorous project-specific requirements.

Stud bolts

ASTM A193 B7 studs, with machine bolts and U-bolts to ASME B18.2.1.

Nuts

Heavy hex nuts matched to the stud grade and service.

Spiral-wound gaskets

Wound to ASME B16.20 with 304/304L and 316/316L windings.

Ring-joint gaskets

Ring joint, non-asbestos, elastomeric and PTFE gaskets.

Fasteners

Type	Stud Bolts Nuts	Machine Bolts U-Bolts

Specification	ASTM A193 · A194 · A307 · A320
Grade	B7 · B7M · B8 · B8M · B16 · Grade A · B · L7 · L7M
Size	1/2" up to 10"
Dimension	ASME B18.2.1 · B18.2.2 · ASME B16.5 · B16.47
Standards & Specifications	API 601 · ANSI B16.5 · B16.20 · B16.21 · MSS SP-44

Gaskets

Type	Spiral Wound Non-Asbestos Elastomeric	Teflon Ring Joint

Grade	304/304L · 316/316L
Size	1/2" up to 56"
Class	150 · 300 · 600 · 900
Dimension	ASME B16.20 · ASME B16.21
Standards & Specifications	API 601 · ANSI B16.5 · B16.21 · MSS SP-44

Approvals

Vendor Approvals & Certifications

Demonstrating our commitment to excellence, we hold critical operational approvals from the region’s premier industrial organizations:

Saudi Aramco 1003347

SABIC 500234

Ma’aden 5351

Yasref 100378

Satorp 10276

Sipchem 100953

Luberef 63040

Petro Rabigh 100244

Saudi Energy 2000452

Samref 10056

Farabi Petrochemicals 8001385

ISO 9001:2015 SA003667

Supply chain

Global Supply Chain Network

We maintain robust partnerships with leading metallurgical and manufacturing facilities worldwide:

Region	Country of Origin	Suppliers
Middle East	Saudi Arabia	Arcelor Mittal · Erne · IVM · JESCO · Armetal · Precision Forgings · Tenaris SSP · JASCO · Abahsain Neway · AVK · Al-Iman Gasket · Al-Rashed Fasteners · SAFAMI
	Oman	Al-Jazeera
Europe	Austria	Erne Fittings
	France	Delcorte · Interfit · Vallourec
	Germany	V & M · Wilhelm Schulz
	Italy	Bonney Forge · Mega · Metalfar · Officine Santafede · Tecnoforge · Mariani Rubintterie · Orion · Valvitalia · Melesi
	Romania	Silicotub · Petrotub · Vilmar
	Spain	Ulma · TUBOS
	UK	Crane
Asia	China	TPCO · HENGYANG VALIN · Jiuli · Baofeng · Wujin · Yoneki · Youfa
	Japan	Benkan · Kuwana
	South Korea	PK Valve · SeAH · Sungkwang Bend · TK Corporation · Velan · KOFCO · Hyundai
	Taiwan	Inoxtek · Ta chen
	Thailand	Awaji Materials · Gourd Fittings · BIS · Thai Benkan
	India	Viraj · Good Luck Engineering · Surya
Americas	USA	Apollo Valves · Swagelok · FBV · Parker Fittings
	Brazil	V & M
Africa	South Africa	MITTAL

Next step

Send the line list. We'll mark what's on the ground.

Every enquiry is time-stamped and logged on arrival, then answered in the order received. Include size, schedule, grade and quantity for the fastest turnaround.

Request a quotation +966 13 814 5888

Piping enquiriesinfo@alialnassarco.comAttach your line list or MTO Direct line+966 13 814 5888Al-Khobar head office