Product

Lined Blind Flange

A PTFE (Polytetrafluoroethylene) lined blind flange is used to seal the end of a piping system, a valve, or a vessel nozzle. Our PTFE lined blind flanges are available in sizes ranging from 25 mm to 300 mm in diameter, with lining thickness varying from 3 mm to 7 mm depending on size.

Process ready Leak resistant Chemical duty

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Product Overview

Application and service highlights

Introduction

A PTFE (Polytetrafluoroethylene) lined blind flange is a specialized piping component used to seal the end of a piping system, a valve, or a vessel nozzle. Our PTFE lined blind flanges are available in sizes ranging from 25 mm to 300 mm in diameter, with lining thickness varying from 3 mm to 7 mm depending on the size.

Key Features

Provides secure end closure for lined piping systems.
Suitable for isolation, maintenance and unused nozzle positions.
Helps protect the internal closure face from corrosive media.

Specifications

Material, dimensions and testing standards

Material

Body: ASTM A-105 / IS 2062 GR.A.
Lining: PTFE conforming ASTM D4895; PFA conforming ASTM D3307; PP conforming ASTM D4101; PVDF conforming ASTM D3222; HDPE conforming ASTM D3350.

Dimensions

Flange as per ANSI B16.42 / ANSI B16.5.
Lining and other dimensional tolerance as per ASTM F1545.
Lining thickness: 3 mm to 7 mm.

Testing

100% visual and dimensional check.
100% spark test at 15 KVDC.
100% hydro test at 29 Kg/cm2, holding for 3 minutes, as per ASTM F1545.
100% lining thickness check (>80% of flaring thickness).

Technical Drawing

Cross-sectional reference

Dimensional Specifications

Dimensional table

Size		Diameter (D)	Raised Face (R/F)	P.C.D (K)	Flange Thick. (T)	No. of Holes (N)	Hole Dia (B)	Lining Thickness (±0.5mm)	Length ± 5mm (Max L)
NB	Inch
25	1"	33.7	50	79	15	4	15	3	1500
40	1.5"	48.3	65	95	17	4	18	3	1500
50	2"	60.3	80	127	19	4	19	3	1500
80	3"	88.9	100	152	22	4	22	3	1200
100	4"	114.3	125	178	24	8	22	3	1000