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Wuxi Yiteng Pressure Vessel Co, Ltd.
Add：No 58, Zhenyang Road, Qingyang Town, Jiangyin, Jiangsu
Contacts：Mr. Zhang
Tel：13506192042
Fax：0510-86557866
Website：www.yitengrq.com
E-mail：wxzhangyaodong@163.com / yeekai@yitengrq.com

BEM Heat Exchanger

Technical Specifications of BEM Heat Exchanger
(Per TEMA Naming Convention)

The BEM Heat Exchanger is a fixed tube sheet heat exchanger under the TEMA standard. Its naming convention and core parameters are as follows:

1. TEMA Naming Convention Breakdown

BEM consists of three letters, each representing a key design feature:

o B: Front Head Type (B = removable channel cover for tube-side maintenance).
o E: Shell Type (E = single-pass standard shell).
o M: Rear Head Type (M = fixed tube sheet).

Example Model: BEM-600-150-4/2-1

o 600: Shell diameter (mm)
o 150: Heat transfer area (m²)
o 4/2: Tube-side/shell-side design pressure (MPa)
o 1: Number of tube passes

2. Key Technical Parameters (TEMA BEM Standard)

Parameter	Typical Value/Range	TEMA Requirements
Design Standard	ASME VIII Div.1 + TEMA BEM	Complies with TEMA Class R/C
Heat Transfer Area	5~800 m²	Max 600 m² for tubes ≤9m
Design Pressure (Shell/Tube Side)	0.6~4.0 Mpa (6~40 bar)	Special calculation for high-pressure models
Design Temperature	-20°C to +300°C	Special materials required >300°C
Shell Diameter	DN150~DN1000	Reinforcement needed for shells >1m
Tube Bundle Parameters
- Tube OD	Φ19.05 mm (3/4") / Φ25.4 mm (1")	TEMA-recommended sizes
- Tube Length	1.5m / 3m / 6m / 9m	Length-to-diameter ratio ≤8:1
- Tube Layout Angle	30° / 45° / 90°	Triangular or square pitch
Tube Sheet Thickness	50~200 mm	Calculated based on pressure and diameter
Baffle Type	Single segmental (20%~35% cut)	Baffle spacing ≥1/5 shell diameter
Nozzle Flanges	ANSI 150~600 / DIN PN10~40	Flange spacing ≥1.2×tube OD

3. Key Structural Features

1.Fixed Tube Sheet Design (M-Type):

o Tube bundle welded to the shell, simple structure with high pressure resistance.
o Suitable for clean shell-side fluids or chemically cleanable applications.

2.Removable Front Channel Cover (B-Type):

o Bolted cover allows tube-side maintenance and individual tube replacement.

3.Single-Pass Shell (E-Type):

o Standard shell design with optimized baffle arrangement.

4. Typical Applications

o Chemical Processes: Heat exchange for clean media (e.g., circulating water, solvents).
o HVAC Systems: Chillers, district heating systems.
o Food/Pharma: Heating/cooling of low-viscosity fluids.
o Power Industry: Low-pressure feedwater heaters.

5. Selection Limitations & Notes

1.Thermal Expansion Limitation:

o Use with caution if shell-tube ΔT >50°C (risk of thermal stress cracking).

2.Cleaning Limitations:

o Shell side cannot be mechanically cleaned; only for clean or chemically cleanable fluids.

3.Pressure Limitation:

o Design pressure typically ≤4.0 Mpa; higher pressures require thicker tube sheets.

6. Comparison with Other TEMA Types

Model	Front Head	Shell Type	Rear Head	Best For
BEM	Removable (B)	Single-pass (E)	Fixed tube sheet (M)	Clean fluids + small ΔT
AES	Removable (A)	Single-pass (E)	Packed floating head (S)	High-pressure + cleanable
BEU	Removable (B)	Single-pass (E)	U-tube bundle (U)	Large ΔT + low maintenance

Note: BEM exchangers are low-cost and simple but require strict operating conditions (clean media + small ΔT).