Dead Weight Hatches Model A, AL

The Model A is a dead weight pressure relief gauge and thief hatch with round 8″ nominal diameter API base. The Model A also provides vacuum relief capacity.

The Model A-L is a dead weight pressure vacuum relief gauge and thief hatch with (8″x18″) oblong API base.

Technical Data

Attachments

SKU:tp-024 Category: TANK GAUGING Brand: Sesco

Available on backorder

Request quotation and delivery time

Description

When excessive pressure builds within the storage tank the vent’s hinged cover begins to open at the predetermined set pressure, relieving excess pressure.

When the over pressure has dissipated the cover reseats onto the base. The hinge mechanism prevents misalignment and provides an accurate reseat.

When excessive vacuum builds within the storage tank the spring loaded pallet lifts, breaking the seal between the seat and pallet, allowing vapors to pass through the valve orifice relieving the vacuum buildup. The vacuum valve reseals upon relief and remains sealed.

Features & Benefits

Full opening lid design for higher venting capacity requirements
Field replaceable gaskets without the need of special tools or complex procedures
Optional gasket materials available for “Sour Gas” or corrosive applications
Non-Corrosive coating option for extremely harsh environments
Certified flow capacities in accordance with API

Model A Dimensions and Parts

Ref.	Part No.	Part Name	Material	Qty.
1	1 1	Base	Aluminum	1
*1	WN	Base	Steel	1
2	A101-2	Cap	Cast Iron	1
3	A102-2	Center 0.06 kg	Cast Aluminum	1
*3	A102	Center 0.06, 0.11 kg	Cast Iron	1
4	A103	Vacuum Disc	Cast Aluminum	1
5	A104	Vacuum Gasket	Buna N	1
*5	A104V	Vacuum Gasket	Viton	1
6	A105	Vacuum Disc Spring	Stainless Steel	1
7	A106	Cotter Key	Plated	1
8	A107	Cap Set Screw	Plated	1
9	A108	Washer	Plated	1
10	10G	Pressure Gasket	Sp. Neop.	1
*10	110-GV	Pressure Gasket	Sponge Viton	1
11	5-K	Hinge Pin	CRS Plated	1
12	HPC-148	Hinge Pin Clip	Plated	1
*13	110-BG	Base Gasket	Tank Packing	1
*14	1/2-13×1 1/2	Bolt, Hex	Pltd.	16
*14	1/2-13	Nut, Hex	Pltd.	16

* Optional – Furnished upon request only.

Model A-L Dimensions and Parts

Ref.	Part No.	Part Name	Material	Qty.
1	1A	Base	Aluminum	1
2	A111	Cap	Cast Iron	1
3	A112	Center 0.06 kg	Cast Iron	1
*3	A114	Center 0.11 kg	Cast Iron	1
4	A103	Vacuum Disc	Cast Aluminum	1
5	A104	Vaccum Gasket	Buna N	1
*5	A104V	Vacuum Gasket	Viton	1
6	A105	Vac. Disc Spring	S.S	1
7	A106	Cotter Key	Pltd.	1
8	A107	Cap Set Screw	Pltd.	1
9	A108	Washer	Pltd.	1
10	10G	Pressure Gasket	Sp.Neop.	1
*10	10GV	Pressure Gasket	Sponge Viton	1
11	5	Hinge Pin	CRS Plated	1
12	HPC-148	Hinge Pin Clip	Pltd.	2
*13	AL-BG	Base Gasket	Tank Packing	1
*14	1/2-13×1 1/2	Bolt, Hex	Pltd.	26
*14	1/2-13	Nut, Hex	Pltd.	26

* Optional – Furnished upon request only.