Spirax Sarco SIB30 and SIB30H are all stainless steel sealed inverted bucket steam traps. They are supplied with a specified pressure change assembly depending on the required operating pressure differential. The traps are available with a range of seat sizes to suit pressure differentials between 0.5 to 30 bar (7.25 to 435 psi) and are fully compliant with the Pressure Equipment Directive (PED).

Sizes and Pipe Connections

• ½" and ¾" screwed BSP or NPT.
• DN15 and DN20 socket weld ends (BS 3799).
• DN15 and DN20 flanged ASME 150, ASME 300 and EN 1092 PN40 as standard. Alternative flanges are available on request, with JIS tables 20, 16 and 10 connections.

Limiting Conditions (ISO 6552)

Operating Region

The product must not be used outside the recommended maximum operating pressure region.

Parameter	Value
PMA Maximum allowable pressure	49 barg @ 38°C (711 psi g @ 100 °F)
TMA Maximum allowable temperature	400°C @ 28 barg (752°F @ 406 psig)
Minimum allowable temperature	-29°C (-20.2°F)
PMO Maximum operating pressure for saturated steam service	30 bar g (435 psi g)
TMO Maximum operating temperature	400°C @ 28 barg (752°F @ 406 psig)
Minimum operating temperature	0°C (32°F)
Designed for a maximum cold hydraulic test pressure of	75 bar g (1 087.5 psi g)

Maximum Differential Pressure (ΔPMX)

ΔPMX Maximum differential pressure	SIB30 Model	SIB30H Model
30.0 bar (435 psi)	SIB30/4	SIB30H/5
20.0 bar (290 psi)	SIB30/5	SIB30H/6
12.0 bar (174 psi)	SIB30/6	SIB30H/7
8.5 bar (123 psi)	SIB30/7	SIB30H/8
5.0 bar (72 psi)	-	SIB30H/10
4.0 bar (58 psi)	SIB30/8	-
2.5 bar (36 psi)	SIB30/10	-
2.0 bar (29 psi)	-	SIB30H/12
1.5 bar (21 psi)	SIB30/12	-

Materials

No.	Part	Material	Standard
1	Cover	Stainless steel	ASTM A240 Gr. 304
2	Body	Stainless steel	A182F304
2	Flanges	Carbon steel	Mat No. 1.0460 (C22.8)
3	Bucket	Stainless steel	BS 1449 321 S 12
4	Pivot pin	Stainless steel	BS 970 304 S 15
5	Valve seat	Stainless steel	AISI440B
6	Valve	Stainless steel	AISI440B
7	Valve lever	Stainless steel	BS 1449 321 S 12
8	Internal tube	Stainless steel	BS 3605 304 S 14

Capacities

Trap Selection

A trap should be selected for the most appropriate working pressure differential and not on the basis of load. For example, a load of 80 kg/h at 7 bar differential should be handled with the SIB30/7 and not the SIB30/4.

Dimensions and Weights (approximate in mm and kg)

SIB30

Size	A	A1	B	C	D	Weight (Scr/SW)	Weight (Flg)
DN15 - ½"	110	150	76	124	143	1.5	2.9
DN20 - ¾"	110	150	76	124	143	1.5	2.9

SIB30H

Size	A	A1	B	C	D	Weight (Scr/SW)	Weight (Flg)
DN15 - ½"	110	150	76	159	177	1.75	3.15
DN20 - ¾"	110	150	76	159	177	1.75	3.15

Installation and Maintenance

Safety Information

Safe operation requires proper installation and use. Ensure all pressure is safely isolated and vented before maintenance. The external surface may be very hot in normal use.

• Positioning: The trap must be installed with the body upright so that the bucket is rising and falling vertically. It must be installed in a horizontal pipeline, below the drain point of the plant. A small drop leg should precede the trap - typically 150 mm (6").
• Priming: When superheat conditions exist, the trap body may need to be primed with water prior to steam being turned on to avoid steam blowing through the trap.
• Air Venting: Inverted bucket steam traps do not permit rapid release of air. A separate external air vent is required in parallel to vent air efficiently. Any bypass should be positioned above the trap.
• Accessories: Where the trap discharges into a closed condensate return system or where there is a lift at the trap, a check valve should be fitted downstream of the trap. If installed on a superheated system, a non-return valve should be fitted on the inlet.
• Welding: When welding the trap into the pipeline, this should be carried out by electric arc process. (The cover and flanges are TIG welded to the body during manufacture).
• Maintenance: The SIB30 and SIB30H are factory set sealed steam traps. They are non-adjustable, non-maintainable, and require no maintenance; therefore, no spares are available.