Flanges Pipe Fittings & Gaskets Order

On January 15, 2025, we received an inquiry from a long-standing Vietnamese client regarding ASME B16.5 weld neck flanges, ASME B16.20 metal wound gaskets, bolts, nuts, and other flange pipe fittings. After confirming specifications, materials, quantities, and packaging requirements, we promptly provided a quotation based on the client’s provided list. As this client is a long-term partner, we are thoroughly familiar with their application conditions and procurement practices, enabling smooth communication throughout the process. The customer remained highly satisfied with our pricing, delivery schedule, and quality standards, placing an order one week later.

Procurement List

Description	Material	Unit	Quantity
FLANGE 1″ LWN RF L=157 300# ASME B16.5	SA-350 LF2 CL.1	PCS	2
FLANGE 1″ LWN RF L=159 300# ASME B16.5	SA-350 LF2 CL.1	PCS	1
FLANGE 2″ LWN RF L=154 300# ASME B16.5	SA-350 LF2 CL.1	PCS	1
SPIRAL WOUND GASKET 1″ 300# ASME B16.20	316L+316L/FG+316L	PCS	2
SPIRAL WOUND GASKET 10″ 150# ASME B16.20	316L+316L/FG+316L	PCS	1
SPIRAL WOUND GASKET 16″ 150# ASME B16.20	316L+316L/FG+316L	PCS	4
HEX. NUT 1″-UNC	SA-194 2H	PCS	128
HEX. NUT 1.1/2″-8UN	SA-194 2H	PCS	240
HEX. NUT 1.1/4″-8UN	SA-194 2H	PCS	96
HEX. NUT 3/4″-UNC	SA-194 2H	PCS	16
HEX. NUT 5/8″-UNC	SA-194 2H	PCS	64
HEX. BOLT M22*100MM	SA-193 B7	PCS	2
STUD BOLT 1″-UNC L=145MM	SA-193 B7	PCS	32
STUD BOLT 1″-UNC L=155MM	SA-193 B7	PCS	32
STUD BOLT 1.1/2″-8UN L=270MM	SA-193 B7	PCS	56

Inspection photos

Weld Neck Flange

Weld Neck Flanges feature a long tapered hub that transfers stress smoothly to the pipe, providing high strength and fatigue resistance under high pressure and temperature. The butt-weld connection reduces turbulence and stress concentration, ensuring reliable sealing in critical pipeline systems.

Item	Details
Product Type	Lap Joint Flange (LWN RF)
Size & Pressure	1″, 2″，300#
Production Standard	ASME B16.5
Material Standard	ASTM A350 LF2 CL.1
Material Composition	C ≤ 0.30%, Mn 0.60-1.35%, Si 0.15-0.30%

Spiral Wound Gasket

Spiral Wound Gaskets consist of alternating layers of metal strips and flexible filler, such as graphite or PTFE. The structure maintains elasticity, compensates for flange surface irregularities, and withstands thermal cycling, offering stable and reliable sealing in high-pressure and high-temperature pipelines.

Item	Details
Product Type	Spiral Wound Gasket
Size & Pressure	1″, 10″, 16″，150#& 300#
Production Standard	ASME B16.20
Material Standard	316L / Flexible Graphite / 316L
Material Composition	C ≤ 0.03%, Cr 16.0-18.0%, Ni 10.0-14.0%, Mo 2.0-3.0%

Bolt and Nut

Bolts and nuts provide the clamping force needed for flange connections. When tightened to the specified torque, bolts generate tension that compresses the gasket, forming a leak-proof joint. The material of bolts and nuts must match the flange pressure rating and operating conditions to ensure strength, corrosion resistance, and long-term stability.

Item	Details
Product Type	Stud Bolt / Hex Bolt
Size	1″-UNC, 1.1/2″-8UN, M22
Material Standard	ASTM A193
Material Composition	C 0.37-0.49%, Cr 0.80-1.10%, Mo 0.15-0.25%

Item	Details
Product Type	Stud Bolt / Hex Bolt
Size	1″-UNC, 1.1/2″-8UN, M22
Material Standard	ASTM A193
Material Composition	C 0.37-0.49%, Cr 0.80-1.10%, Mo 0.15-0.25%

Class 300 Weld Neck Flange Dimension & Weight

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	95.20	15.70	14.20	52.30	21.30	38.10	35.00	4	15.70	66.55	0.75
3/4	26.70	117.3	20.80	15.70	57.15	26.70	47.70	42.90	4	19.00	82.50	1.26
1	33.40	123.9	26.70	17.50	62.00	33.50	53.80	50.80	4	19.00	88.90	1.52
1 1/4	42.20	133.3	35.10	19.00	65.00	42.20	63.50	63.50	4	19.00	98.50	2.03
1 1/2	48.30	155.4	40.90	20.60	68.30	48.30	69.85	73. 15	4	22.30	114.3	2.89
2	60.30	165. 1	52.60	22.30	69.85	60.45	84.00	91.90	8	19.00	127.0	3.4
2 1/2	73.00	190.5	62.70	25.40	76.20	73.15	100.0	104.6	8	22.30	149.3	5.17
3	88.90	209.5	78.00	28.40	79.25	88.90	117.3	127.0	8	22.30	168.1	6.93
3 1/2	101.6	228.6	90.20	30.20	81.00	101.6	133.3	139.7	8	22.30	184.1	8.67
4	114.3	254.0	102.4	31.70	85.80	114.3	146.0	157.2	8	22.30	200.1	11.2
5	141.3	279.4	128.3	35.00	98.50	141.2	177.8	185.7	8	22.30	234.9	15.1
6	168.3	317.5	154.2	36.50	98.50	168.4	206.2	215.9	12	22.30	269.7	19.1
8	219.1	381.0	202.7	41.10	111.2	219.2	260.3	269.7	12	25.40	330.2	29.9
10	273.0	444.5	254.5	47.70	117.3	273.0	320.5	323.8	16	28.40	387.3	42.7
12	323.8	520.7	304.8	50.80	130.0	323.8	374.6	381.0	16	31.70	450.8	61.8
14	355.6	584.2	To be specified by the Purchaser	53.80	142.7	355.6	425.4	412.7	20	31.70	514.3	85.8
16	406.4	647.7		57.15	146.0	406.4	482.6	469.9	20	35.00	571.5	106
18	457.2	711.2		60.45	158.7	457.2	533.4	533.4	24	35.00	628.6	131
20	508.0	774.7		63.50	162.0	508.0	587.2	584.2	24	35.00	685.8	158
24	609.6	914.4		69.85	168.1	609.6	701.5	692.1	24	41.10	812.8	230

Applications

Oil & Gas Pipelines

Chemical Processing Plants

Power Plants

Water & Wastewater Treatment

Marine & Shipbuilding