The GPE gauge hatch, also known as a sampling hatch, dip hatch, or access hatch, is a manually operated device installed on the top of above-ground storage tanks. It allows for safe and controlled access to tank contents for manual level gauging, sampling, or temperature measurement, without causing excessive vapor loss or exposing operators to hazards.
Safe Manual Access: Provides secure and controlled access for operators to perform manual gauging and sampling.
Emission Control: Designed with tight-sealing lids to minimize vapor loss during non-operation.
Easy Operation: Quick-opening design enables fast access without special tools.
Pressure Relief Option: Some hatches come with spring-loaded or weight-loaded lids that serve as secondary pressure/vacuum relief devices.
Regulatory Compliance: Helps meet API 650, API 2000, and environmental safety standards.
Durability: Made from robust materials like aluminum, stainless steel, or carbon steel for long service life.
Gauge hatches are used in a wide variety of storage tanks and process vessels in industries such as:
Oil and gas terminals
Petrochemical refineries
Food and beverage processing
Pharmaceutical manufacturing
Biofuel and ethanol plants
Wastewater treatment facilities
Agricultural chemical storage
Manual level gauging using dip tapes or bobbers
Product sampling for quality control
Insertion of temperature probes or inspection tools
| Feature | Typical Specification |
|---|---|
| Size | 4″ to 8″ (common sizes: 6″, 8″) |
| Material Options | Aluminum, carbon steel, stainless steel |
| Sealing Mechanism | Gasketed lid (neoprene, PTFE, or Viton) |
| Mounting Type | Flanged or threaded |
| Opening Type | Hinged lid, spring-loaded, or weight-loaded |
| Pressure Rating | Atmospheric; some rated up to 1 psig for venting capability |
| Standards | API 650, API 2000, ISO, NFPA |
| Additional Features | Lockable lids, explosion-proof designs, vapor seals |
Mount the hatch on top of the tank roof or manway nozzle using standard bolt or flange connections.
Ensure the gasket is properly seated to prevent vapor leaks.
The hatch should be easily accessible for operators and not obstructed by piping or other structures.
Level the mounting surface to ensure a proper seal.
Routine Inspection: Periodic checks to ensure lid integrity, seal condition, and hinge/latch operation.
Gasket Replacement: Replace gaskets when degraded or hardened to maintain airtight sealing.
Cleaning: Remove any product buildup, corrosion, or residue from the lid and seating surface.
Corrosion Protection: Apply coatings or use corrosion-resistant materials in aggressive environments.
Operational Testing: If the gauge hatch has a venting feature, verify pressure/vacuum release functions during inspection.
Emission Reduction: Properly sealed hatches limit the escape of volatile organic compounds (VOCs), aiding in compliance with EPA and local air quality regulations.
Supports Safe Manual Sampling: Reduces the need for automated systems in some cases, conserving energy and equipment resources.
Reusable Components: Long-lasting metal housings and replaceable gaskets extend product life and reduce waste.
Recyclable Materials: Aluminum and stainless steel hatches are recyclable at end of life.
Minimal Operational Footprint: No power consumption, purely mechanical device.
Improperly maintained hatches may leak vapors, contributing to air pollution.
Worn gaskets or damaged seals may lead to product contamination or spillage during gauging.
