Model L12-TH

Round Pan Thief Hatch

The LaMOT Valve & Arrestor Model L12-TH Thief Hatch incorporates a spring loaded pressure/vacuum relief valve within the device. Thief Hatches are used on steel or fiberglass (FRP) low pressure storage tanks. The hatch has a gauging hook integrated to the base to be used while sampling the tank, providing access for level gauging, sampling, and overpressure/vacuum protection for the tanks, all in one compact design. Superior sealing is achieved from an active envelope pressure gasket that expands around the base to increase seal until the designated pressure setting is reached. This design saves you money by greatly reducing vapor loss compared to a traditional thief hatch design.
  • Each Hatch is individually tested and certified at factory
  • Each hatch has its own serial number – for tracking and traceability
  • Precision machining and manufacturing to accomplish superior sealing
  • Leak Rate less than 1.0 SCFH at 90% of set pressure
  • Ultra-tight sealing reduces product leakage and fugitive emissions
  • Industry leading flow rates
  • Higher flow capacity to protect from excessive pressure build up
  • Precision machining and manufacturing to accomplish high flow rates
  • Active envelope pressure gasket that expands around the base to increase seal
  • Three Ear Center Assembly – better alignment and stronger, less breakage
  • Pressure gasket is captured in the center assembly by groove
  • SLIC Pins used on lid hinge, latch hinge and latch lock pin – less time for maintenance
  • Rear hinge is precision machined – provides superior alignment and sealing
  • Incorporates a mechanical lock system to be used with a pad lock or lock out bar
  • Bonding Strap is standard equipment
  • L12-TH convertible to a Lockdown Hatch with LVA conversion kit (L-Kit)
  • Superior emission performance validated by End User FLIR inspection
  • *Optional Thrust Bearing (Must be ordered with “Hatch” or “Center Assembly” for in the field replacement)
  • Size: 8”
  • Bolting: API 12
  • Available Pressure Settings: 4, 6, 8, 10, 12, 16, 24, & 32 osig
  • Available Vacuum Settings: 0.4. 0.9 & 3.5 osig
  • Leak Rate: Less than 1 SCFH of Air @ 90% of Set Pressure
  • Casting: Aluminum (non-sparking)
  • Envelope Gasket: HNBR, FKM or Fluorosilicone
  • Vacuum Diaphragm: HNBR, FKM, Fluorosilicone or Fluoropolymer
  • Springs: Galvanized Steel or Inconel® X-750

• Polyester/PTFE Coating

• Flange (base) Gasket

• Mounting Kit

• Adapters

Customize Your Order

Select your specifications below to generate a custom product number.

Zip Code Locator

Model #

Size

Body Material

Envelope Gasket

Vacuum Diaphragm

Spring Material

Pressure Setting

Vacuum Setting

Options

NEXT chevron_right

Your Product Selections

Model #:

Size:

Body Material:

Envelope Gasket:

Vacuum Diaphragm:

Spring Material:

Pressure Setting:

Vacuum Setting:

Options:

Your LaMOT Valve & Arrestor Rep

Contact the business listed below to start your order.

Enter your email address to receive a copy of this information.

We will not store or sell your email address or send you any other communications.

Other Thief & Lockdown Hatches

Model L12-TL

Long Pan Thief Hatch

The L12-TL incorporates a large working surface, larger cover, and a gauging and sampling hook into the base. The base is inclined to match the slope of the API12 tank’s roof to provide a level working surface. A bonding strap and SLIC™ pins come standard with the L12-TL.

View Long Pan Thief Hatch chevron_right

Model L1220A

Private: Pipe-Away

The LaMOT Valve and Arrestor Model L1221B Pressure/Vacuum Relief Valve is designed to protect your tank from damage created by overpressure or excessive vacuum. Costly product evaporation losses due to normal tank “breathing” are greatly reduced. Because the 1200 Series products retain toxic vapors, atmospheric contamination is minimized which helps to provide increased fire protection and safety.

View Private: Pipe-Away chevron_right

Model L2300A

Private: Pressure Relief Valve

The L2300A provides emergency relief capacity above what can be supplied by standard operating valves. Use it to protect tanks, piping and low-pressure vessels from internal pressure damage.

View Private: Pressure Relief Valve chevron_right

Model L1201B

Private: Vent to Atmosphere

The LaMOT Valve and Arrestor Model L1201B Pressure/Vacuum Relief Valve is designed to protect your tank from damage created by overpressure or excessive vacuum. Costly product evaporation losses due to normal tank “breathing” are greatly reduced. Because the L1200 Series products retain toxic vapors, atmospheric contamination is minimized which helps to provide increased fire protection and safety.

View Private: Vent to Atmosphere chevron_right

Let's Get Started

We don’t manufacture until you order. Our production team employs the latest tools and techniques in agile manufacturing to fabricate your order to your specifications. After production and assembly, each product undergoes stringent quality inspections before leaving the production floor – we guarantee you’ll get exactly what you ordered.

Find a Rep