Installation of welded-on pieces in pipelines and their use for pressure sensing

Pressure sensing area:
Turbine gas meters: from 6 DN before the gas meter to 5 DN
Rotary gas meters: from 2 DN in front of the gas meter to 4 DN

Use of welded-on pieces:
A, B - connection of an indicating pressure gauge
C, D - connection of a registration pressure gauge,
gas quantity counters, pressure sensors, etc.

Connecting the registration pressure gauge in the same room or within a 5m length of impulse pipe ( D ):

extension NTP 20, on which is screwed the shut-off valve for pressure gauges ČSN 13 7517.5 type A
(type B) through a pressure gauge socket adapter (part of the shut-off valve to the pressure gauges), PM 20L/8 screw connection
tube f 8mm ČSN 42 6711.31 of the appropriate length
screw the PM 20P/8 fitting onto the registration pressure gauge

Connection of the registration pressure gauge outside the room or above 5 m of impulse pipe length ( C ):

extension NTP 20, on which the shut-off valve for pressure gauges ČSN 13 7517.5 type A is screwed
(type B) through a pressure gauge socket adapter (part of the shut-off valve to the pressure gauges), PM 20L/8 screw connection
tube f 8mm ČSN 42 6711.31 of the appropriate length
screw fitting PM 20P/8, shut-off valve for pressure gauges ČSN 13 7517.5 type A (type B) screw on
to the registration pressure gauge via the pressure gauge socket adapter (part of the closing valve to the pressure gauges)

Installation of direct welded-on pieces in a horizontal pipe for temperature sensing

Note 1:
welded-on piece NPVM 20.1 + threaded plug ZZM 20.0
welded-on piece NPVM 27.1 + threaded plug ZZM 27.0
welded-on piece NPVG 34.1 + threaded plug ZZG 34.0

Note 2:
welded-on piece NPVM 27.1 + thermometer well TJS M + technical thermometer - 30 to + 50 °C

Note 3:
NPVM 20.1 welded-on piece + PJS recalculator well
NPVM 27.1 welded-on piece + PRJS M recalculator well
NPVG 34.1 welded-on piece + PRJS G counter well
NPVM 27.1 welded-on piece + RJS register thermometer well
NPVM 20.1 welded-on piece + TJSP sensor well

The lengths of the "C" welded-on pieces used correspond to the nominal diameter DN and the size of the well used, see table 1:

DN (mm)	Welded-on piece	Length C (mm)	Well	Plug
50	NPVM 20	30	-	ZZM 20
	NPVM 20	50	-	ZZM 20
	NPVM 27	35	-	ZZM 27
	NPVM 27	50	TJS M100	ZZM 27
	NPVM 27	70	TJS M100, TJS M125	ZZM 27
	NPVG 34	35	-	ZZG 34
	NPVG 34	50	TJS G100	ZZG 34
	NPVG 34	70	TJS G100, TJS G125	ZZG 34
80	NPVM 20	30	-	ZZM 20
	NPVM 20	50	PJS 01, PJS 02	ZZM 20
	NPVM 27	35	TJS M100	ZZM 27
	NPVM 27	50	TJS M100, TJS M125, PRJS M03	ZZM 27
	NPVM 27	70	TJS M125, RJS 125, PRJS M03, PRJS M04	ZZM 27

	NPVG 34	35	TJS G100	ZZG 34
	NPVG 34	50	TJS G100, TJS G125, PRJS G01	ZZG 34
	NPVG 34	70	TJS G125, PRJS G01, PRJS G02	ZZG 34
100	NPVM 20	30	PJS 01	ZZM 20
	NPVM 20	50	PJS 01, PJS 02, TJSP 160	ZZM 20
	NPVM 27	35	TJS M100, TJS M125, PRJS M03	ZZM 27
	NPVM 27	50	TJS M100, TJS M125, RJS 125, PRJS M03, PRJS M04	ZZM 27

	NPVM 27	70	TJS M125, TJS M160, RJS 125, PRJS M03, PRJS M04	ZZM 27

	NPVG 34	35	TJS G100, TJS G125, PRJS M03	ZZG 34
	NPVG 34	50	TJS G100, TJS G125, PRJS G01, PRJS G02	ZZG 34

	NPVG 34	70	TJS G125, TJS G160, PRJS G01, PRJS G02	ZZG 34

150	NPVM 20	30	PJS 01, PJS 02, TJSP 160	ZZM 20
	NPVM 20	50	PJS 01, PJS 02, TJSP 160	ZZM 20
	NPVM 27	35	TJS M100 až TJS M160, RJS 125, RJS 160, PRJS M03, 04	ZZM 27

	NPVM 27	50	TJS M100 až TJS M160, RJS 125, RJS 160, PRJS M03, 04	ZZM 27

	NPVM 27	70	TJS M125, TJS M160, RJS 125 až RJS 200, PRJS M03, 04	ZZM 27

	NPVG 34	35	TJS G100 až TJS G160, PRJS G01, PRJS G02	ZZG 34

	NPVG 34	50	TJS G100 až TJS G160, PRJS G01, PRJS G02	ZZG 34

	NPVG 34	70	TJS G125, TJS G160, PRJS G01, PRJS G02	ZZG 34

In the case of installation of oblique welds in a horizontal pipeline, the wells must face against the direction of gas flow! Table 2 applies to this case (see below)

Installation of scarf welded-on piecses in a vertical pipe for temperature sensing

Note 1:
welded-on piece NSM 20.1 + threaded plug ZZM 20.0
welded-on piece NSM 27.1 + threaded plug ZZM 27.0
welded-on piece NSG 34.1 + threaded plug ZZG 34.0

Note 2:
welded-on piece NSM 27.1 + thermometer well TJS M
+ technical thermometer - 30 to + 50 °C

Note 3:
welded-on piece NSM 20.1 + PJS counter sump
welded-on piece NSM 27.1 + PRJS M recalculator sink
welded-on piece NSG 34.1 + PRJS G counter sump
welded-on piece NSM 27.1 + RJS registration thermometer well
welded-on piece NSM 20.1 + TJSP sensor well

The lengths of the "C" welded-on pieces used correspond to the nominal diameter DN and the size of the well used, see table 2:

DN (mm)	Welded-on piece	Length C (mm)	Well	Plug
50	NSM 20	25	-	ZZM 20
	NSM 20	50	PJS 01, PJS 02,	ZZM 20
	NSM 27	35	TJS M100	ZZM 27
	NSM 27	50	TJS M125	ZZM 27
	NSM 27	70	RJS 125	ZZM 27
	NSG 34	35	TJS G100	ZZG 34
	NSG 34	50	TJS G125	ZZG 34
	NSG 34	70	–	ZZG 34
80	NSM 20	25	PJS 01, PJS 02	ZZM 20
	NSM 20	50	PJS 01, PJS 02, TJSP 160	ZZM 20
	NSM 27	35	TJS M100, TJS M125, PRJS M03, PRJS M04	ZZM 27

	NSM 27	50	TJS M125, TJS M160, RJS 125, PRJS M03, PRJS M04	ZZM 27

	NSM 27	70	TJS M160, RJS 125, RJS 160, PRJS M03, PRJS M04	ZZM 27

	NSG 34	35	TJS G100, TJS G125, PRJS G01, PRJS G02	ZZG 34

	NSG 34	50	TJS G125, TJS G160, PRJS G01, PRJS G02	ZZG 34

	NSG 34	70	TJS G160, PRJS G01, PRJS G02	ZZG 34
100	NSM 20	25	PJS 01, PJS 02, TJSP 160	ZZM 20
	NSM 20	50	PJS 01, PJS 02, TJSP 160	ZZM 20
	NSM 27	35	TJS M100 až TJS M160, RJS 125, PRJS M03, PRJS M04	ZZM 27

	NSM 27	50	TJS M125, TJS M160, RJS 125, RJS 160, PRJS M03, PRJS M04	ZZM 27

	NSM 27	70	TJS M160, RJS 125, RJS 160, PRJS M04	ZZM 27

	NSG 34	35	TJS G100 až TJS G160, PRJS G01, PRJS G02	ZZG 34
	NSG 34	50	TJS G125, TJS G160, PRJS G01, PRJS G02	ZZG 34

	NSG 34	70	TJS G160, PRJS G02	ZZG 34
150	NSM 20	25	PJS 01, PJS 02, TJSP 160, TJSP 250	ZZM 20

	NSM 20	50	PJS 01, PJS 02, TJSP 160, TJSP 250	ZZM 20
	NSM 27	35	TJS M100 až TJS M160, RJS 125 až RJS 200, PRJS M03, PRJS M04	ZZM 27

	NSM 27	50	TJS M125, TJS M160, RJS 125 až RJS 200, PRJS M03, PRJS M04	ZZM 27

	NSM 27	70	TJS M160, RJS 160 až RJS 200, PRJS M04	ZZM 27

	NSG 34	35	TJS G100 až TJS G160, PRJS G01, PRJS G02	ZZG 34

	NSG 34	50	TJS G125, TJS G160, PRJS G01, PRJS G02	ZZG 34

	NSG 34	70	TJS G160, PRJS G02	ZZG 34

EXAMPLE OF USING A BUILDING SYSTEM FROM THIN-WALLED PROFILES FOR MOUNTING GAS QUANTITY CONVERTERS (Elcor-94), DATA LOGGERS (Datcom), PRESSURE SENSORS, ETC.