Bottom Transfer Loading Arm (BT-377)
- Home
- Loading Arms & Couplings
- Excel Loading Arm Systems
- Bottom Transfer Loading Arm (BT-377)

The Bottom Transfer Loading Arm (BT-377) is designed for efficient loading and unloading operations where extended reach and flexibility are required. It is a low-profile bottom loading system that operates without the need for overhead support structures, making it suitable for installations with limited vertical space.

SafeRack supplies Excel Loading Systems BT-377, providing expert support to help you select the right configuration, materials, and sealing options for your application. Our team assists with specifications, compatibility, and system integration to ensure safe, efficient, and reliable fluid transfer operations. Get technical guidance, lead times, and pricing support for Excel Loading Systems BT-377, all in one place.
Bottom Transfer Loading Arm (BT-377)
Overview
The BT-377 Bottom Transfer Loading Arm is engineered for ground-level installation, offering a compact and highly flexible loading solution. Its design allows the primary arm and boom sections to extend outward into the loading area in an accordion-like motion, providing excellent reach capability.
This system is ideal for terminals where lateral space is available but overhead structures are not present. It supports both loading and unloading operations from the side or rear of tank trucks, ensuring operational flexibility in a wide range of industrial environments.
Key Features
- Low-profile bottom transfer loading arm design
- No overhead support structure required
- Extended reach for variable truck positioning
- Accordion-style boom extension for flexibility
- Suitable for side and rear truck loading
- Multiple configuration options available
- Right-hand and left-hand orientation options
- Up-feed, down-feed, and horizontal feed configurations
- Compatible with vapor recovery systems
- Supports emergency breakaway and quick disconnect systems
- Designed for single-product loading applications
- Heavy-duty industrial construction for long service life
Bottom Transfer Loading Arm (BT-377) Specifications
| Specification | Detail |
|---|---|
| Model | BT-377 |
| Type | Bottom Transfer Loading Arm |
| Installation Type | Low-profile ground-mounted system |
| Arm Movement | Accordion-style extension |
| Configuration Options | Right Hand / Left Hand / Up Feed / Down Feed / Horizontal Feed |
| Sizes Available | 2″, 3″, 4″, 6″ |
| Material Options | Carbon Steel, Low Temperature Carbon Steel, Aluminum, Stainless Steel |
| Specialty Materials | Alloy 20, Hastelloy C |
| Mounting Type | Ground-level (no overhead structure required) |
| Application | Loading and Unloading Systems |
| Vapor Recovery | Compatible (optional configuration) |
Materials of construction
| Component | Material |
|---|---|
| Arm Structure | Carbon Steel/Low Temperature Carbon Steel/Aluminum/Stainless Steel |
| Specialty Metals | Alloy 20/Hastelloy C |
| Swivel Assembly | Industrial Grade Steel |
| Hose Options | Composite / Rubber / Stainless Steel |
| Coating | Heavy Duty Industrial Paint System |
| Connection Components | API Coupler Compatible Systems |
Source: Excel Loading Systems BT-377
Source: BT-377
BT-377 Frequently Asked Questions
The BT-377 is used for loading and unloading liquids in applications where extended reach and flexibility are required. It is commonly used in terminals where vehicles cannot be precisely positioned, allowing safe and efficient product transfer.
No, the BT-377 is a low-profile system that does not require overhead support. It is designed for ground-level installation, making it suitable for facilities where vertical space is limited or unavailable.
Yes, the BT-377 is designed for both loading and unloading operations. Its flexible arm movement allows it to connect from different angles, including side and rear truck positions.
It is widely used in petroleum terminals, chemical facilities, and LPG handling operations. It is especially useful in environments requiring flexible positioning and reliable ground-level loading systems.
The BT-377 is available in carbon steel, low temperature carbon steel, aluminum, and stainless steel. Specialty materials such as Alloy 20 and Hastelloy C are also available for demanding applications.
Related Products
Excel Loading Systems TLBS-375BH — Bullhorn Style Top Loading Arm
Excel Loading Systems TLBS-375BH — Bullhorn Style Top Loading Arm (Supported Boom, Railcar)
Excel Loading Systems TLBS-374 — Supported Boom Top Loading Arm
Excel Loading Systems TLBS-374 — Supported Boom Top Loading Arm
Excel Loading Systems TLB-374 — Unsupported Boom Top Loading Arm
Excel Loading Systems TLB-374 — Unsupported Boom Top Loading Arm (Extended Reach)
Excel Loading Systems TL-54 — Fixed Reach Top Loading Arm
Excel Loading Systems TL-54 — Fixed Reach Top Loading Arm
Excel Loading Systems Snap-On API Coupler — Series 513 Semi-Automatic Coupler
Excel Loading Systems Snap-On API Coupler — Series 513 Semi-Automatic Coupler
Excel Loading Systems Quick Adjust Spring Cylinder
Excel Loading Systems Quick Adjust Spring Cylinder — Compression Spring Balance Assembly
Excel Loading Systems Click API Coupler — CLICK Semi-Automatic API Coupler
Excel Loading Systems Click API Coupler — CLICK Semi-Automatic API Coupler
Excel Loading Systems XL1.0DSA — Dual Seal Swivel Joint (hazardous service)
The Excel Loading Systems XL1.0DSA Dual Seal Swivel Joint provides hazardous-service leak protection with dual seals and integrated leak detection.
Counterweight Bottom Loading Arms (CW-30)
Excel Loading Systems CW-30 — Counterweight Bottom Loading Arm
Excel Loading Systems XL2.0HP — High-Pressure Dual-Race Swivel Joint
The Excel Loading Systems XL2.0HP High-Pressure Dual-Race Swivel Joint is engineered for demanding high-pressure fluid transfer applications, delivering exceptional durability, smooth operation, and reliable sealing performance.
Excel Loading Systems BT-377 — Bottom Transfer Loading Arm
Excel Loading Systems BT-377 — Bottom Transfer Loading Arm (Low-Profile, No Overhead Support Required)
Excel Loading Systems BL-50 — Bottom Transfer Arm
Excel Loading Systems BL-50 — Bottom Transfer Arm (Horizontal Storage, Similar to BL-54)
Excel Loading Systems XL-1.0 — Standard Swivel Joint
Excel Loading Systems XL-1.0 — Standard Swivel Joint (split flange, domestic)
Excel Loading Systems TL-544 — Variable Reach Top Loading Arm
Excel Loading Systems TL-544 — Variable Reach Top Loading Arm (Scissor / Pantograph)
Excel Loading Systems BL-54 — Bottom Loader Arm
Excel Loading Systems BL-54 — Bottom Loader Arm (Extended Reach, Horizontal Storage)
Excel Loading Systems AF-54 — A-Frame Bottom Loading Arm
Excel Loading Systems AF-54 — A-Frame Bottom Loading Arm
Bottom Transfer Hose Loader (BT-44)
Excel Loading Systems BT-44 — Bottom Transfer Hose Loader (Low-Profile, Economical)
Excel Loading Arm Systems & Components
SafeRack is North America’s largest distributor of Excel loading arm systems & components








