GB 18985-2021 English PDF

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Q: Should I purchase the latest version GB 18985-2021?

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US$409.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB 18985-2021: Amount of supply gases for divers
Status: Valid

GB 18985: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 18985-2021	409	Add to Cart	4 days	Amount of supply gases for divers	Valid
GB 18985-2003	799	Add to Cart	4 days	Amount of supply gases for divers	Obsolete

Similar standards

GB 20827 GB/T 12552

Basic data

Standard ID: GB 18985-2021 (GB18985-2021)
Description (Translated English): Amount of supply gases for divers
Sector / Industry: National Standard
Classification of Chinese Standard: R53
Word Count Estimation: 22,287
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB 18985-2021: Amount of supply gases for divers

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Amount of supply gases for divers ICS 03.220.40 R53 National Standards of People's Republic of China Replace GB 18985-2003 Diver air supply Released on 2021-04-30 2021-11-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Foreword Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Air supply flow requirements for diving operations 1 4.1 Air flow of ventilated diving equipment1 4.2 Air supply flow of surface air supply and demand-supply diving equipment 2 4.3 Air flow of self-contained diving gear 2 5 Gas storage requirements for diving operations 2 5.1 The amount of gas storage required for air diving operations 2 5.2 The amount of gas storage required for surface-demand diving equipment used in mixed gas diving operations3 5.3 The amount of gas reserves required for diving in Bangsi 5 5.4 The amount of gas storage required for air saturation diving operations 7 5.5 The amount of gas reserves required for roving diving operations in nitrogen and oxygen saturated air 8 5.6 The amount of gas storage required for helium-oxygen saturation diving operations 10 Appendix A (informative appendix) Oxygen consumption, carbon dioxide production and ventilation under normal pressure under different labor intensity 13 Appendix B (informative appendix) Table of upper and lower limit values of oxygen concentration in helium-oxygen mixture for diving 14 Appendix C (informative appendix) Oxygen concentration in helium-oxygen mixture for treatment 16

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB 18985-2003 "Diver Air Supply". Compared with GB 18985-2003, except for editorial changes, the main technical The content of the surgery changes as follows. ---Added the terms and definitions of "Bangsi Diving" (see 3.2); --- Deleted the terms and definitions of "breathing mixture" and "conventional diving" (see 3.2 and 3.3 in the.2003 edition); --- Deleted the calculation of the air supply flow rate of the ejector regenerative helium-oxygen diving equipment (see 4.4 in the.2003 edition); --- Deleted the content of the amount of gas required to maintain a certain remaining pressure of the gas supply in the gas storage container (see 4.5.4 in the.2003 edition); --- Amend "air routine diving" to "air diving" (see 5.1, 4.5 in the.2003 edition); ---Added the calculation of the amount of oxygen required for air diving therapy (see 5.1.2.2); --- Amend "Helium and Oxygen Routine Diving" to "Mixed Gas Diving" (see 5.2, 4.6 of the.2003 edition); ---Modify the calculation of the mixed gas consumption (see 5.2.1, 4.6 in the.2003 edition); ---Added the calculation of the amount of mixed gas required for mixed gas diving therapy (see 5.2.1.2); ---Added the calculation of the air mixture decompression air volume (see 5.2.3); ---Added Bangsi diving air volume calculation (see 5.3); ---Modified the calculation method of saturated diving cruise gas (see 5.6.3, 4.7.3.4 of the.2003 edition); ---Modified the calculation method of saturation diving reserve therapeutic gas (see 5.6.5, 4.7.3.5 of the.2003 edition). This standard was proposed and managed by the Ministry of Transport of the People's Republic of China. The previous versions of the standard replaced by this standard are as follows. ---GB n268-1987; ---GB 18985-2003. Diver air supply

1 Scope

This standard specifies the gas supply flow requirements for diving operations and the gas reserve requirements for diving operations. This standard applies to air diving and mixed air diving conducted by divers using ventilated, surface air supply and self-contained diving equipment. Water, Bangsi diving and saturation diving operations.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 17871 Nitrogen and oxygen saturation or air saturation-air circuit diving decompression procedure GB 26123 Air diving safety requirements GB 28396 Safety requirements for mixed gas diving

3 Terms and definitions

The following terms and definitions defined in GB 26123 and GB 28396 apply to this document. 3.1 Meet the minimum breathing gas flow required for underwater operations by divers and the minimum breathing gas volume required to complete diving operations. 3.2 Bouncediving Mixed gas diving using a closed diving bell-deck decompression chamber system.

4 Air supply flow requirements for diving operations

4.1 Air flow of ventilated diving equipment The calculation method of the minimum air supply flow required when using ventilated equipment for underwater operations is according to formula (1). Qv1=q1× d0 1æ ÷ (1) Where. Qv1---The minimum air flow required for divers using ventilated diving equipment to perform operations underwater, in liters per minute (L/ min); q1 ---The ventilation volume of a diver using a ventilated diving gear during a given labor intensity operation under normal pressure, in liters per minute (L/min) (light labor intensity q1=65; medium labor intensity q1=100; heavy labor intensity q1=190); d ---Diving operation water depth, in meters (m); d0 --- the depth of water when the hydrostatic pressure increases by 0.10MPa, in meters (m), d0=10m. Note. Divers are considered to be engaged in light labor-intensive operations during the decompression process during the dive or underwater phase. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB 18985-2021_English be delivered?

Answer: Upon your order, we will start to translate GB 18985-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB 18985-2021_English with my colleagues?

Answer: Yes. The purchased PDF of GB 18985-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB 18985-2021?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB 18985-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.