Suction Pipeline Assembly Classification

1

Suction pipeline assembly

Custom (integrated with matching parts)

Carbon steel (Q235) or stainless steel (304), surface anti-corrosion treated for industrial fluid transfer

1. Abrasive wear from particle-laden fluids; 2. Corrosion from chemical media or moisture; 3. Stress damage from pulsation or vibration.

1. Filter fluids to remove large particles; 2. Apply anti-corrosion coating annually; 3. Use floating supports to reduce pulsation impact.

2

Suction pipeline

NB004.06.18.00

Stainless steel (304), precision-machined inner wall to reduce fluid flow resistance

1. Blockage from debris accumulation; 2. Weld fatigue from system vibration; 3. Corrosion-induced wall thinning.

1. Clean pipeline monthly; 2. Inspect welds for cracks quarterly; 3. Avoid excessive bending during installation.

3

Suction flange (I)

NB004.06.17

Carbon steel (A105) with galvanized surface, compliant with industrial flange connection standards

1. Sealing surface wear from repeated assembly; 2. Bolt hole deformation from over-tightening; 3. Corrosion from external moisture.

1. Use torque wrenches for uniform tightening; 2. Inspect sealing surfaces for scratches before installation; 3. Apply anti-rust grease to flange edges.

4

Suction flange (II)

NB100.05.34

Carbon steel (A105) with galvanized surface, designed for high-pressure suction system connections

1. Leakage from damaged gaskets; 2. Flange deformation from pressure surges; 3. Corrosion from fluid seepage.

1. Replace gaskets during each disassembly; 2. Avoid sudden pressure spikes; 3. Clean flange surfaces to remove fluid residues.

5

Suction inlet blind plate 12''

NB100.05.37

Carbon steel (Q235), thickened structure for pipeline sealing during maintenance or shutdown

1. Deformation from improper clamping; 2. Corrosion from long-term storage or exposure; 3. Sealing failure from surface damage.

1. Tighten evenly with matching fasteners; 2. Store in dry, clean areas when not in use; 3. Inspect sealing surfaces for damage before installation.

1

Hexagon bolt 1"-8×4

ASME B18.2.1

Alloy steel (8.8 grade), quenched and tempered, compliant with ASME B18.2.1 for high tensile strength

1. Thread wear from over-tightening; 2. Fatigue fracture from system vibration; 3. Corrosion leading to thread seizure.

1. Tighten to specified torque (80-90N·m); 2. Use lock washers for vibration resistance; 3. Apply anti-seize agent in humid environments.

2

Hexagon nut: 1"-8

ASME B18.2.2

Alloy steel (8.8 grade), compatible with ASME B18.2.1 bolts for secure fastening

1. Thread wear from repeated assembly; 2. Deformation from excessive torque; 3. Corrosion causing locking failure.

1. Replace nuts when reusing bolts; 2. Match torque with corresponding bolts; 3. Clean threads before installation.

3

Pipe plug: NPT1 1/2

NB100.05.35

Carbon steel (Q235), galvanized, NPT thread for pipeline plugging and sealing

1. Thread wear from repeated installation; 2. Leakage from improper sealing; 3. Corrosion from fluid or environmental moisture.

1. Use thread sealant during installation; 2. Avoid over-tightening to prevent thread damage; 3. Inspect for corrosion regularly.

4

Plug screw M20×1.5

JB/T 1000

Carbon steel (Q235), precision-threaded, compliant with JB/T 1000 for small-diameter pipeline plugging

1. Thread stripping from improper tool use; 2. Corrosion leading to seizure; 3. Seal failure from surface damage.

1. Use matching hex tools; 2. Apply anti-rust coating after installation; 3. Replace if threads are worn or damaged.

1

O-ring 345×7

GB/T3452.1

Nitrile rubber (NBR), compliant with GB/T3452.1, resistant to oil and industrial fluids

1. Aging from high temperature or oil exposure; 2. Cracking from improper installation; 3. Swelling from incompatible chemical media.

1. Replace every 6 months or if aging is detected; 2. Avoid stretching during installation; 3. Use compatible fluids to prevent swelling.

2

Gasket, pressure sensor

NB002.09.03

PTFE (polytetrafluoroethylene), high-temperature and corrosion resistant for pressure sensor sealing

1. Deformation from over-tightening; 2. Wear from fluid erosion; 3. Aging from long-term use in harsh environments.

1. Tighten to recommended torque; 2. Replace during sensor maintenance; 3. Avoid contact with sharp edges.

3

Floating supporting assembly, suction pipe

NB005.12.00

Carbon steel bracket with rubber damping pads, designed for pipeline vibration reduction

1. Rubber pad aging from vibration and temperature; 2. Bracket deformation from excessive load; 3. Corrosion from environmental moisture.

1. Replace rubber pads annually; 2. Ensure load capacity matches pipeline weight; 3. Apply anti-corrosion coating to the bracket.

4

Suction pulsation dampener

NB100.05.32.00

Stainless steel (316) shell with rubber diaphragm, for reducing fluid pulsation in suction pipelines

1. Diaphragm damage from excessive pulsation; 2. Corrosion of shell from chemical fluids; 3. Leakage from seal aging.

1. Inspect diaphragm quarterly for cracks; 2. Match with system pulsation range; 3. Replace seals annually or if leakage occurs.

1

What fluids are compatible with the O-ring 345×7?

The NBR O-ring (GB/T3452.1) is compatible with mineral oil, drilling mud, and most industrial fluids. Avoid strong acids, alkalis, or halogenated hydrocarbons, which cause swelling and damage.

2

How to maintain the suction pulsation dampener?

Inspect the diaphragm quarterly for cracks or deformation; replace it every 12 months. Check shell seals for leakage and clean the dampener interior during annual maintenance to ensure optimal pulsation reduction.

3

Can the fastening components be replaced with standard aftermarket parts?

Yes, hexagon bolts (ASME B18.2.1) and nuts (ASME B18.2.2) comply with international standards, so standard aftermarket parts of the same size and grade can be used for replacement, ensuring compatibility and reliability.