Low-Pressure Vessel Design

Before the design, we need to obtain the following information from you.

I. Basic Functional Parameters (Design Premise)

Medium Information

• Medium name (e.g., water, gasoline, compressed air, corrosive chemicals)
• Medium temperature (design temperature t, specify whether it is normal/low/high temperature condition)
• Medium properties (whether it is flammable, explosive, toxic, corrosive, prone to crystallization/polymerization)
• Medium composition (e.g., component ratio of mixed gas, concentration of liquid)

Vessel Parameters

• Vessel type (e.g., cylindrical, spherical, square, vertical/horizontal)
• Design pressure p (specify whether it is gauge pressure/absolute pressure, unit: MPa)
• Design volume V (effective volume, unit: m3 or L)
• Nominal diameter DN​ (nominal diameter of the vessel, unit: mm)
• Total height H (overall height of the vessel, including supports, flanges, etc.)

II. Structural and Installation Parameters (Core of Design)

Structural Form

• Head type (e.g., elliptical head, dished head, conical head)
• Support type (e.g., vertical support, horizontal support, saddle support)
• Flange specification (e.g., nominal diameter DN​, nominal pressure PN, sealing surface type)
• Nozzle quantity and specification (nozzle diameter dN​, material, layout position)
• Manhole/handhole size (nominal diameter, quantity, position)
• Accessory configuration (e.g., pressure gauge connection, safety valve connection, level gauge connection)

Installation Requirements

• Installation location (e.g., indoor/outdoor, ground/mounted)
• Environmental conditions (e.g., temperature, humidity, corrosive environment)
• Foundation dimensions (e.g., support spacing, foundation load capacity, embedded part position)
• Transportation and lifting requirements (e.g., lifting point position, maximum allowable weight)

III. Material and Standard Parameters (Compliance Basis)

Material Requirements

• Main material grade (e.g., Q235B, 16MnR, 304 stainless steel)
• Material specification (e.g., steel plate thickness, steel pipe outer diameter, flange material)
• Material properties (e.g., yield strength ReL​, tensile strength Rm​, elongation)
• Material standard (e.g., GB/T 700, GB/T 1591)

Design Standards

• Executive standards (e.g., GB 150, ASME BPVC, EN 13445)
• Design codes (e.g., pressure vessel design code, welding code)

IV. Safety and Performance Parameters (Safety Assurance)

Safety Accessories

• Safety valve specification (set pressure, discharge capacity, connection size)
• Pressure gauge range (shall be 1.5~3 times the design pressure)
• Level gauge type (e.g., float type, radar type, magnetic flap type)

Performance Requirements

• Pressure test pressure (usually 1.25 times the design pressure)
• Vacuum requirement (e.g., pressure difference when the vessel is under negative pressure)
• Corrosion resistance requirement (e.g., surface treatment grade, anti-corrosion coating thickness)

V. Commercial and Delivery Parameters (Project Implementation)

Delivery Requirements

• Delivery time (e.g., design cycle, manufacturing cycle, acceptance time)
• Delivery documents (e.g., design drawings, calculation reports, inspection reports)
• Acceptance criteria (e.g., visual inspection, non-destructive testing, pressure test)

Other Requirements

• After-sales service (e.g., installation guidance, maintenance, warranty period)
• Special requirements (e.g., explosion-proof, leakage-proof, environmental protection requirements)

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