IOM FS Iss 9; April 2012; ECR1269
Page 2 of 8
1
Specification and Principle of Operation
Firegroove and Fireflange Type
1.1
Introduction
The Firesure flowmeter is a direct reading flowmeter, approved for use under the LPCB rules for automatic
sprinkler installations.
These meters have been approved for installation with gauge glass in the vertical position. There must be at least
five diameters of straight pipe upstream and downstream of the orifice plate. The isolating valve on the pressure
tappings must be kept closed when the meter is not being used. A spare gauge glass must be provided and
located in the cabinet containing the stock of replacement sprinklers.
1.2
Construction and Specification
Main Orifice Carrier -
316 stainless steel flow orifice mounted in a polyester coated mild steel carrier
Bypass Flow Indicator -
Nickel-plated copper tubing and brass connections
Stainless steel filter element, restrictor rodding and float indicator
Boroscilicate glass indicator tube
Viton and polyurethane seals
Max Operating Pressure -
16 bar
Max Operating Temperature -
90
°
C maximum
Connection -
Fireflange - Wafer style bolted between flanges
Firegroove – Cut groove pipe ends using approved pipe couplings
1.3
Principle of Operation
Water flow through the main orifice, creates a pressure difference between the two pressure tapping ports. These
pressure ports are connected across the bypass flow indicator, causing a small bypass flow through the indicator,
directly related to the flow through the main orifice. An indicating float positioned within the glass tube can be
read against scale markings, which show the flow rate delivery of the installation.
Main Orifice
Carrier
Pressure
Tapping Ports
Bypass Flow
Indicator
