Point-count listing and simulated-discharge test requirements for gas extinguishing system commissioning (030909)

Topic Positioning

The bill listing and measurement of gas extinguishing system commissioning (GB/T 50856-2024 Annex J, code 030909) and the simulated discharge test that must be completed at construction acceptance (GB 50263-2007 clause 6.2.2) - for listing the commissioning item, counting the points and verifying the commissioning content.

Core Conclusions

1. Bill listing and measurement (GB/T 50856-2024 Annex J table J.9.1 fire system commissioning, code 030909; J.11.9 notes, item 4, original wording): "Gas extinguishing system commissioning covers extinguishing systems of heptafluoropropane, IG541, carbon dioxide etc.; counted in points on the cylinder valves of the gas extinguishing system units." That is: gas extinguishing system commissioning is a separate bill item, unit "point", the point count following the number of cylinder valves of the units - not a percentage of the installation items nor a whole-system charge. When applying the quota, convert by the point steps / size bands of the quota chosen - some provincial consumption quotas or pricing tables band "gas extinguishing system unit commissioning" by test vessel size (40 L, 70 L, 90 L, 155 L, 270 L), unit "point", priced on the actual units' size and count; other sub-items under the same 030909 code (e.g. fire monitor control device commissioning) are charged separately on their own bases.

2. Simulated discharge test requirements (GB 50263-2007 Code for Construction and Acceptance of Gas Extinguishing Systems, clause 6.2.2, key points): "At commissioning, a simulated discharge test shall be carried out on all protected zones or objects per section E.3 of this code, and it shall pass. For pre-engineered systems such as cabinet gas extinguishing units and hot-aerosol units, one set of each is preferably tested per the linked-operation provisions of the product standard." Commentary points: the simulated discharge test verifies the system's operational reliability and the correctness of the pipe connections, and doubles as a live drill, so that the system performs as intended; the test vessel counts in section E.3 reflect current practice; pre-engineered systems (cabinet, hot aerosol) that carry certificates of conformity and were not assembled on site may be exempt from inspection, but for reliability a linked-operation test is recommended.

Applicability Boundaries

• The bill "point" (by cylinder valves) and the quota's point steps and test-vessel size bands are two bases - not interchangeable; convert per the chosen quota's banding rules.
• Piped systems: the simulated discharge test runs zone by zone over all protected zones or objects and must pass (mandatory); cabinet and aerosol pre-engineered systems "preferably" take one set each for a linked-operation test per the product standard - unassembled, certified units may be exempt, but where exempt, assess from extinguishing reliability whether to make up the linked test.
• Safety measures for gas extinguishing commissioning are computed separately; the commissioning fee covers system-wide testing, adjustment and trials and must not double with the single-unit / in-situ commissioning already in the equipment installation items.
• Commissioning content and technical standards are further governed by the acceptance codes for water extinguishing and fire alarm systems; this card covers the gas extinguishing part only.

Further Reading

GB/T 50856-2024 quantity take-off standard for general building services, Annex J table J.9.1 (fire system commissioning, code 030909) and J.11.9 notes item 4; GB 50263-2007 Code for Construction and Acceptance of Gas Extinguishing Systems, clause 6.2.2 and section E.3 (simulated discharge test); the "gas extinguishing system unit commissioning" items (banded by test vessel size) of provincial consumption quotas / pricing tables.