SAFETY PRODUCTS THAT PROTECT EQUIPMENT, LIVES & THE ENVIRONMENT

THIEF HaTcH

P A G E 2 // G R O T H C O R P O R A T I O N

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PROduCT OvERvIEw

The GROTH Model 12-TH Thief Hatch was designed to out perform the competition, with industry leading high flow rates and precision tolerances to provide a superior sealing performance. The leakage is less than 1 SCFH of air @ 90% of the set pressure, keeping your tanks in compliance with industry standards.

The Model 12-TH Thief Hatch incorporates a spring load-ed pressure/vacuum relief valve within the device. Thief Hatches are used on steel or fiberglass (FRP) low pressure oil tanks. Providing access for level gauging, sampling, and overpressure/vacuum protection for the tanks, all in one compact design.

wHY THIEF HATCHES ARE REQuIREd

• Saves money by avoiding environmental standards fines • Protects tank from overpressure/ vacuum when sized properly* • Minimizes evaporation emissions • Reduces atmospheric corrosion of tank • Required to meet industry compliance

*Calculate vent size in accordance with API Standard 2000 - venting Atmospheric and Low-Pressure Storage Tanks and API 12.

SuPERIOR SEALING PERFORMANCEThe leakage is less than 1 SCFH of Air @ 90% of the set pressure.

Since 1960, you have been able to rely on precision engineered products from Groth Corporation. These pressure relief products have been protecting refin-eries and plants for more than 50 years. And now, we are excited to announce a new member to the prod-uct family the Model 12-TH Thief Hatch.

Extensive R&d has gone into the Model 12-TH Thief Hatch. we started with the end product in mind, focusing on the unique application solution. we were able to accomplish a product design with both superior sealing performance and industry leading flow rates. we paid a high attention to detail in the precision machining and manufacturing to accom-plish these exact tolerances.

Superior sealing is achieved from an active envelope pressure gas-ket 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 tra-ditional thief hatch design.

The most impres-sive feature of the precision engineered design is the high flow capacity. Savings can be immediately realized with a proper size reduction of other components such as the Pressure vacuum Relief valve and Emergency Relief valve.

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G R O T H C O R P O R A T I O N // P A G E 3

HIGH FLOw CAPACITY

The high flow capacity is the new standard set by the Model 12-TH Thief Hatch.

G R O T H C O R P O R A T I O N / / S P R I N G L O A D E D T H I E F H A T C H / / P A G E 4

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INduSTRIESOil & GasLiquid Storage

• Ultra-tight sealing reduces product leakage and fugitive emissions• Higher flow capacity to protect from excessive pressure build up• Designed for easy maintenance, thus reducing downtime and lower operational cost • Corrosion resistance can be enhanced with FKM soft goods and coating• Direct replacement for any standard round API 12 thief hatch• Incorporates a mechanical lock system to be used with a pad lock or lock out bar

• Size: 8” (200 mm)• Bolting: API 12 • Available Pressure Settings: 4, 6, 8, 12, 16, 24 & 32 osig• Available Vacuum Settings: 0.4, 0.9 & 3.5 osig• Leak Rate: 1 SCFH air @ 90% of set pressure

FEATURES & BENEFITS

TECHNICAL dETAILS

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• Materials of Construction: Casting: Aluminum (Non-Sparking) Envelope Gasket: HNBR, FKM,

or Fluorosilicone Vacuum Diaphragm: HNBR, FKM,

Fluorosilicone, or Fluoropolymer• Optional: Polyester/PTFE Coating• Accessories: Flange (base) Gasket, Mounting Kit

0

1

2

3

4

5

6

7

0 5 10 15 20 25 30 35 40 45

Vacu

um F

low

ing

Pres

sure

(osig

)

Flow Rate (1000 SCFH)Flow values based on air at 60°F and atmospheric pressure of 14.6959 psia

0

8

16

24

32

40

48

56

64

0 20 40 60 80 100 120 140 160 180 200 220

Flow

ing

Pres

sure

(osig

)

Flow Rate (1000 SCFH)Flow values based on air at 60°F and atmospheric pressure of 14.6959 psia

PRESSuRE RELIEF CAPACITY

vACuuM RELIEF CAPACITY

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G R O T H C O R P O R A T I O N // P A G E 5

32 os

ig

24 os

ig

16 os

ig

12 os

ig

8 osig6 o

sig4 o

sig

3.5 osig

0.9 osig

0.4 osig

Flow curve represents each pressure setting

Flow curve represents each vacuum setting

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P A G E 6 // G R O T H C O R P O R A T I O N

HOw TO ORdER MODEL # SIZE MATERIAL OPTIONS

Body Material:1 = Aluminum

Envelope Gasket:H = HNBRV = FKM F = Fluorosilicone

Vacuum Diaphragm:H = HNBRV = FKMT = FluoropolymerF = Fluorosilicone

Pressure Setting:1 = 4 osig 2 = 6 osig3 = 8 osig4 = 12 osig 5 = 16 osig6 = 24 osig7 = 32 osig

Vacuum Setting:1 = 0.4 osig 2 = 0.9 osig3 = 3.5 osig

Coating:O = No CoatingE = Polyester/PTFE Coating

OPTIONAL ACCESSORIES:Base Gasket:GKT12TH08K302 = Non-AsbestosGKT12TH087602 = FKM GKT12TH087102 = PTFE GKT12TH084402 = Black Neoprene

Mounting Kit:KS12THBS08P01 = Zinc Plated Steel (½-13 UNC Hex Nut & Bolt)

1 2 - T H 0 8 1Product #:

Maintenance Repair Kit: (use the above chart for selecting material and options)

KIT # SIZE MATERIAL* OPTIONS*K S 1 2 T H M K 0 8

Envelope GasketVacuum Diaphragm

Pressure SettingVacuum Setting

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THE RIGHT SOLuTIONS In petrochemical and refinery operations, protection from fugitive emissions and from fire are the primary

concerns. Groth Corporation pressure safety products protect refineries and petrochemical tank facilities around the globe.

Pressure/Vacuum Relief Valves Pressure/vacuum Relief valves are protection devices typically mounted on a

nozzle opening on the top of a fixed roof atmospheric storage tank. Their primary purpose is to protect a tank against rupture or implosion by allowing the tank to breathe, or vent, when pressure changes in the tank due to normal operations.

Emergency Relief Valves Emergency Relief valves protect tanks against excessive pressure caused by external fire exposure or flashes within the tank.

Emergency relief valves provide higher flow capacity than standard pressure/vacuum relief valves.

Deflagration Flame Arresters deflagration Flame Arresters are fire safety devices used to protect stored or process media from deflagrations. A deflagration flame arrester can be used on the top of a tank or as an in-line safety device where combustible gases are transported

through low pressure pipe lines.

G R O T H C O R P O R A T I O N // P A G E 7

A A

A

B

A A

EC

d

Size Width height Angle

ASSembly WeightClosed Open Closed Open Open

A d B C E

in mm in mm in mm in mm in mm deg lbs kg

8 200 14.95 379 20.25 514 7.45 189 15.25 387 109.5 13.8 6.26

SPECIFICATIONS

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